mirror of https://github.com/apache/lucene.git
further demo site updates - mostly making the Demo links work again
git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@808115 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Mark Robert Miller
parent
6cf489113c
commit
533831e584
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@ -302,27 +302,27 @@ Bring it up in <span class="codefrag">vi</span> or your editor of choice and let
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<h2 class="boxed">IndexFiles</h2>
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<div class="section">
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<p>
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As we discussed in the previous walk-through, the <span class="codefrag">IndexFiles</span> class creates a Lucene
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As we discussed in the previous walk-through, the <a href="api/demo/org/apache/lucene/demo/IndexFiles.html">IndexFiles</a> class creates a Lucene
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Index. Let's take a look at how it does this.
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</p>
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<p>
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The first substantial thing the <span class="codefrag">main</span> function does is instantiate <span class="codefrag">IndexWriter</span>. It passes the string
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"<span class="codefrag">index</span>" and a new instance of a class called <span class="codefrag">StandardAnalyzer</span>.
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The first substantial thing the <span class="codefrag">main</span> function does is instantiate <a href="api/core/org/apache/lucene/index/IndexWriter.html">IndexWriter</a>. It passes the string
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"<span class="codefrag">index</span>" and a new instance of a class called <a href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a>.
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The "<span class="codefrag">index</span>" string is the name of the filesystem directory where all index information
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should be stored. Because we're not passing a full path, this will be created as a subdirectory of
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the current working directory (if it does not already exist). On some platforms, it may be created
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in other directories (such as the user's home directory).
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</p>
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<p>
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The <span class="codefrag">IndexWriter</span> is the main
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The <a href="api/core/org/apache/lucene/index/IndexWriter.html">IndexWriter</a> is the main
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class responsible for creating indices. To use it you must instantiate it with a path that it can
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write the index into. If this path does not exist it will first create it. Otherwise it will
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refresh the index at that path. You can also create an index using one of the subclasses of <span class="codefrag">Directory</span>. In any case, you must also pass an
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instance of <span class="codefrag">org.apache.lucene.analysis.Analyzer</span>.
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refresh the index at that path. You can also create an index using one of the subclasses of <a href="api/core/org/apache/lucene/store/Directory.html">Directory</a>. In any case, you must also pass an
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instance of <a href="api/core/org/apache/lucene/analysis/Analyzer.html">org.apache.lucene.analysis.Analyzer</a>.
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</p>
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<p>
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The particular <span class="codefrag">Analyzer</span> we
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are using, <span class="codefrag">StandardAnalyzer</span>, is
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The particular <a href="api/core/org/apache/lucene/analysis/Analyzer.html">Analyzer</a> we
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are using, <a href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a>, is
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little more than a standard Java Tokenizer, converting all strings to lowercase and filtering out
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stop words and characters from the index. By stop words and characters I mean common language
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words such as articles (a, an, the, etc.) and other strings that may have less value for searching
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@ -332,42 +332,42 @@ different languages (see the <span class="codefrag">*Analyzer.java</span> source
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</p>
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<p>
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Looking further down in the file, you should see the <span class="codefrag">indexDocs()</span> code. This recursive
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function simply crawls the directories and uses <span class="codefrag">FileDocument</span> to create <span class="codefrag">Document</span> objects. The <span class="codefrag">Document</span> is simply a data object to
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function simply crawls the directories and uses <a href="api/demo/org/apache/lucene/demo/FileDocument.html">FileDocument</a> to create <a href="api/core/org/apache/lucene/document/Document.html">Document</a> objects. The <a href="api/core/org/apache/lucene/document/Document.html">Document</a> is simply a data object to
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represent the content in the file as well as its creation time and location. These instances are
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added to the <span class="codefrag">indexWriter</span>. Take a look inside <span class="codefrag">FileDocument</span>. It's not particularly
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complicated. It just adds fields to the <span class="codefrag">Document</span>.
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added to the <span class="codefrag">indexWriter</span>. Take a look inside <a href="api/demo/org/apache/lucene/demo/FileDocument.html">FileDocument</a>. It's not particularly
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complicated. It just adds fields to the <a href="api/core/org/apache/lucene/document/Document.html">Document</a>.
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</p>
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<p>
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As you can see there isn't much to creating an index. The devil is in the details. You may also
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wish to examine the other samples in this directory, particularly the <span class="codefrag">IndexHTML</span> class. It is a bit more
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wish to examine the other samples in this directory, particularly the <a href="api/demo/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a> class. It is a bit more
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complex but builds upon this example.
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</p>
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</div>
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<a name="N100AE"></a><a name="Searching Files"></a>
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<a name="N100A0"></a><a name="Searching Files"></a>
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<h2 class="boxed">Searching Files</h2>
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<div class="section">
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<p>
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The <span class="codefrag">SearchFiles</span> class is
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quite simple. It primarily collaborates with an <span class="codefrag">IndexSearcher</span>, <span class="codefrag">StandardAnalyzer</span>
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(which is used in the <span class="codefrag">IndexFiles</span> class as well) and a
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<span class="codefrag">QueryParser</span>. The
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The <a href="api/demo/org/apache/lucene/demo/SearchFiles.html">SearchFiles</a> class is
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quite simple. It primarily collaborates with an <a href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a>, <a href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a>
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(which is used in the <a href="api/core/org/apache/lucene/demo/IndexFiles.html">IndexFiles</a> class as well) and a
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<a href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a>. The
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query parser is constructed with an analyzer used to interpret your query text in the same way the
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documents are interpreted: finding the end of words and removing useless words like 'a', 'an' and
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'the'. The <span class="codefrag">Query</span> object contains
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the results from the <span class="codefrag">QueryParser</span> which is passed to
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the searcher. Note that it's also possible to programmatically construct a rich <span class="codefrag">Query</span> object without using the query
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'the'. The <a href="api/core/org/apache/lucene/search/Query.html">Query</a> object contains
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the results from the <a href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a> which is passed to
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the searcher. Note that it's also possible to programmatically construct a rich <a href="api/core/org/apache/lucene/search/Query.html">Query</a> object without using the query
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parser. The query parser just enables decoding the <a href="queryparsersyntax.html">Lucene query
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syntax</a> into the corresponding <span class="codefrag">Query</span> object. Search can be executed in
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syntax</a> into the corresponding <a href="api/core/org/apache/lucene/search/Query.html">Query</a> object. Search can be executed in
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two different ways:
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<ul>
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<li>Streaming: A <span class="codefrag">HitCollector</span> subclass
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<li>Streaming: A <a href="api/core/org/apache/lucene/search/Collector.html">Collector</a> subclass
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simply prints out the document ID and score for each matching document.</li>
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<li>Paging: Using a <span class="codefrag">TopDocCollector</span>
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the search results are printed in pages, sorted by score (i. e. relevance).</li>
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<li>Paging: Using a <a href="api/core/org/apache/lucene/search/TopScoreDocCollector.html">TopScoreDocCollector</a>
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the search results are printed in pages, sorted by score (i. e. relevance).</li>
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</ul>
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@ -375,7 +375,7 @@ the search results are printed in pages, sorted by score (i. e. relevance).</li>
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</div>
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<a name="N100FB"></a><a name="The Web example..."></a>
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<a name="N100E2"></a><a name="The Web example..."></a>
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<h2 class="boxed">The Web example...</h2>
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<div class="section">
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<p>
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|
||||
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|
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|
||||
21 0 obj
|
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|
|
@ -227,13 +227,13 @@ endobj
|
|||
15 0 obj
|
||||
<<
|
||||
/S /GoTo
|
||||
/D [21 0 R /XYZ 85.0 507.0 null]
|
||||
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|
||||
>>
|
||||
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|
||||
17 0 obj
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
>>
|
||||
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|
||||
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|
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|
|
@ -244,39 +244,39 @@ endobj
|
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xref
|
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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|
||||
trailer
|
||||
<<
|
||||
/Size 34
|
||||
|
|
@ -284,5 +284,5 @@ trailer
|
|||
/Info 4 0 R
|
||||
>>
|
||||
startxref
|
||||
9378
|
||||
8952
|
||||
%%EOF
|
||||
|
|
|
|||
|
|
@ -345,7 +345,7 @@ the jars included in the <span class="codefrag">WEB-INF/lib</span> directory in
|
|||
</p>
|
||||
<p>
|
||||
You'll notice that this file includes the same header and footer as <span class="codefrag">index.jsp</span>. From
|
||||
there it constructs an <span class="codefrag">IndexSearcher</span> with the
|
||||
there it constructs an <a href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a> with the
|
||||
<span class="codefrag">indexLocation</span> that was specified in <span class="codefrag">configuration.jsp</span>. If there is an
|
||||
error of any kind in opening the index, it is displayed to the user and the boolean flag
|
||||
<span class="codefrag">error</span> is set to tell the rest of the sections of the jsp not to continue.
|
||||
|
|
@ -358,42 +358,42 @@ default value. If the criteria isn't provided then a servlet error is thrown (i
|
|||
this is the result of url tampering or some form of browser malfunction).
|
||||
</p>
|
||||
<p>
|
||||
The jsp moves on to construct a <span class="codefrag">StandardAnalyzer</span> to
|
||||
analyze the search text. This matches the analyzer used during indexing (<span class="codefrag">IndexHTML</span>), which is generally
|
||||
recommended. This is passed to the <span class="codefrag">QueryParser</span> along with the
|
||||
criteria to construct a <span class="codefrag">Query</span>
|
||||
The jsp moves on to construct a <a href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a> to
|
||||
analyze the search text. This matches the analyzer used during indexing (<a href="api/demo/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a>), which is generally
|
||||
recommended. This is passed to the <a href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a> along with the
|
||||
criteria to construct a <a href="api/core/org/apache/lucene/search/Query.html">Query</a>
|
||||
object. You'll also notice the string literal <span class="codefrag">"contents"</span> included. This specifies
|
||||
that the search should cover the <span class="codefrag">contents</span> field and not the <span class="codefrag">title</span>,
|
||||
<span class="codefrag">url</span> or some other field in the indexed documents. If there is any error in
|
||||
constructing a <span class="codefrag">Query</span> object an
|
||||
constructing a <a href="api/org/apache/lucene/search/Query.html">Query</a> object an
|
||||
error is displayed to the user.
|
||||
</p>
|
||||
<p>
|
||||
In the next section of the jsp the <span class="codefrag">IndexSearcher</span> is asked to search
|
||||
In the next section of the jsp the <a href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a> is asked to search
|
||||
given the query object. The results are returned in a collection called <span class="codefrag">hits</span>. If the
|
||||
length property of the <span class="codefrag">hits</span> collection is 0 (meaning there were no results) then an
|
||||
error is displayed to the user and the error flag is set.
|
||||
</p>
|
||||
<p>
|
||||
Finally the jsp iterates through the <span class="codefrag">hits</span> collection, taking the current page into
|
||||
account, and displays properties of the <span class="codefrag">Document</span> objects we talked about in
|
||||
account, and displays properties of the <a href="api/core/org/apache/lucene/document/Document.html">Document</a> objects we talked about in
|
||||
the first walkthrough. These objects contain "known" fields specific to their indexer (in this case
|
||||
<span class="codefrag">IndexHTML</span> constructs a document
|
||||
<a href="api/demo/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a> constructs a document
|
||||
with "url", "title" and "contents").
|
||||
</p>
|
||||
<p>
|
||||
Please note that in a real deployment of Lucene, it's best to instantiate <span class="codefrag">IndexSearcher</span> and <span class="codefrag">QueryParser</span> once, and then
|
||||
Please note that in a real deployment of Lucene, it's best to instantiate <a href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a> and <a href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a> once, and then
|
||||
share them across search requests, instead of re-instantiating per search request.
|
||||
</p>
|
||||
</div>
|
||||
|
||||
|
||||
<a name="N100CE"></a><a name="More sources (developers)"></a>
|
||||
<a name="N100C3"></a><a name="More sources (developers)"></a>
|
||||
<h2 class="boxed">More sources (developers)</h2>
|
||||
<div class="section">
|
||||
<p>
|
||||
There are additional sources used by the web app that were not specifically covered by either
|
||||
walkthrough. For example the HTML parser, the <span class="codefrag">IndexHTML</span> class and <span class="codefrag">HTMLDocument</span> class. These are very
|
||||
walkthrough. For example the HTML parser, the <a href="api/demo/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a> class and <a href="api/demo/org/apache/lucene/demo/HTMLDocument.html">HTMLDocument</a> class. These are very
|
||||
similar to the classes covered in the first example, with properties specific to parsing and
|
||||
indexing HTML. This is beyond our scope; however, by now you should feel like you're "getting
|
||||
started" with Lucene.
|
||||
|
|
@ -401,7 +401,7 @@ started" with Lucene.
|
|||
</div>
|
||||
|
||||
|
||||
<a name="N100E1"></a><a name="Where to go from here? (everyone!)"></a>
|
||||
<a name="N100D4"></a><a name="Where to go from here? (everyone!)"></a>
|
||||
<h2 class="boxed">Where to go from here? (everyone!)</h2>
|
||||
<div class="section">
|
||||
<p>
|
||||
|
|
@ -423,7 +423,7 @@ Users' or Developers' <a href="http://lucene.apache.org/java/docs/mailinglists.h
|
|||
</div>
|
||||
|
||||
|
||||
<a name="N100F1"></a><a name="When to contact the Author"></a>
|
||||
<a name="N100E4"></a><a name="When to contact the Author"></a>
|
||||
<h2 class="boxed">When to contact the Author</h2>
|
||||
<div class="section">
|
||||
<p>
|
||||
|
|
|
|||
|
|
@ -128,10 +128,10 @@ endobj
|
|||
>>
|
||||
endobj
|
||||
26 0 obj
|
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|
||||
<< /Length 2630 /Filter [ /ASCII85Decode /FlateDecode ]
|
||||
>>
|
||||
stream
|
||||
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|
||||
endstream
|
||||
endobj
|
||||
27 0 obj
|
||||
|
|
@ -311,13 +311,13 @@ endobj
|
|||
19 0 obj
|
||||
<<
|
||||
/S /GoTo
|
||||
/D [27 0 R /XYZ 85.0 258.6 null]
|
||||
/D [27 0 R /XYZ 85.0 271.8 null]
|
||||
>>
|
||||
endobj
|
||||
21 0 obj
|
||||
<<
|
||||
/S /GoTo
|
||||
/D [27 0 R /XYZ 85.0 153.466 null]
|
||||
/D [27 0 R /XYZ 85.0 166.666 null]
|
||||
>>
|
||||
endobj
|
||||
23 0 obj
|
||||
|
|
@ -334,50 +334,50 @@ endobj
|
|||
xref
|
||||
0 45
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
trailer
|
||||
<<
|
||||
/Size 45
|
||||
|
|
@ -385,5 +385,5 @@ trailer
|
|||
/Info 4 0 R
|
||||
>>
|
||||
startxref
|
||||
13672
|
||||
13444
|
||||
%%EOF
|
||||
|
|
|
|||
|
|
@ -38,16 +38,16 @@ Bring it up in <code>vi</code> or your editor of choice and let's take a look at
|
|||
<section id="IndexFiles"><title>IndexFiles</title>
|
||||
|
||||
<p>
|
||||
As we discussed in the previous walk-through, the <code><a
|
||||
href="api/core/org/apache/lucene/demo/IndexFiles.html">IndexFiles</a></code> class creates a Lucene
|
||||
As we discussed in the previous walk-through, the <a
|
||||
href="api/demo/org/apache/lucene/demo/IndexFiles.html">IndexFiles</a> class creates a Lucene
|
||||
Index. Let's take a look at how it does this.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The first substantial thing the <code>main</code> function does is instantiate <code><a
|
||||
href="api/core/org/apache/lucene/index/IndexWriter.html">IndexWriter</a></code>. It passes the string
|
||||
"<code>index</code>" and a new instance of a class called <code><a
|
||||
href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a></code>.
|
||||
The first substantial thing the <code>main</code> function does is instantiate <a
|
||||
href="api/core/org/apache/lucene/index/IndexWriter.html">IndexWriter</a>. It passes the string
|
||||
"<code>index</code>" and a new instance of a class called <a
|
||||
href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a>.
|
||||
The "<code>index</code>" string is the name of the filesystem directory where all index information
|
||||
should be stored. Because we're not passing a full path, this will be created as a subdirectory of
|
||||
the current working directory (if it does not already exist). On some platforms, it may be created
|
||||
|
|
@ -55,19 +55,19 @@ in other directories (such as the user's home directory).
|
|||
</p>
|
||||
|
||||
<p>
|
||||
The <code><a href="api/core/org/apache/lucene/index/IndexWriter.html">IndexWriter</a></code> is the main
|
||||
The <a href="api/core/org/apache/lucene/index/IndexWriter.html">IndexWriter</a> is the main
|
||||
class responsible for creating indices. To use it you must instantiate it with a path that it can
|
||||
write the index into. If this path does not exist it will first create it. Otherwise it will
|
||||
refresh the index at that path. You can also create an index using one of the subclasses of <code><a
|
||||
href="api/core/org/apache/lucene/store/Directory.html">Directory</a></code>. In any case, you must also pass an
|
||||
instance of <code><a
|
||||
href="api/core/org/apache/lucene/analysis/Analyzer.html">org.apache.lucene.analysis.Analyzer</a></code>.
|
||||
refresh the index at that path. You can also create an index using one of the subclasses of <a
|
||||
href="api/core/org/apache/lucene/store/Directory.html">Directory</a>. In any case, you must also pass an
|
||||
instance of <a
|
||||
href="api/core/org/apache/lucene/analysis/Analyzer.html">org.apache.lucene.analysis.Analyzer</a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The particular <code><a href="api/core/org/apache/lucene/analysis/Analyzer.html">Analyzer</a></code> we
|
||||
are using, <code><a
|
||||
href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a></code>, is
|
||||
The particular <a href="api/core/org/apache/lucene/analysis/Analyzer.html">Analyzer</a> we
|
||||
are using, <a
|
||||
href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a>, is
|
||||
little more than a standard Java Tokenizer, converting all strings to lowercase and filtering out
|
||||
stop words and characters from the index. By stop words and characters I mean common language
|
||||
words such as articles (a, an, the, etc.) and other strings that may have less value for searching
|
||||
|
|
@ -79,21 +79,21 @@ href="http://svn.apache.org/repos/asf/lucene/java/trunk/contrib/analyzers/common
|
|||
|
||||
<p>
|
||||
Looking further down in the file, you should see the <code>indexDocs()</code> code. This recursive
|
||||
function simply crawls the directories and uses <code><a
|
||||
href="api/core/org/apache/lucene/demo/FileDocument.html">FileDocument</a></code> to create <code><a
|
||||
href="api/core/org/apache/lucene/document/Document.html">Document</a></code> objects. The <code><a
|
||||
href="api/core/org/apache/lucene/document/Document.html">Document</a></code> is simply a data object to
|
||||
function simply crawls the directories and uses <a
|
||||
href="api/demo/org/apache/lucene/demo/FileDocument.html">FileDocument</a> to create <a
|
||||
href="api/core/org/apache/lucene/document/Document.html">Document</a> objects. The <a
|
||||
href="api/core/org/apache/lucene/document/Document.html">Document</a> is simply a data object to
|
||||
represent the content in the file as well as its creation time and location. These instances are
|
||||
added to the <code>indexWriter</code>. Take a look inside <code><a
|
||||
href="api/core/org/apache/lucene/demo/FileDocument.html">FileDocument</a></code>. It's not particularly
|
||||
complicated. It just adds fields to the <code><a
|
||||
href="api/core/org/apache/lucene/document/Document.html">Document</a></code>.
|
||||
added to the <code>indexWriter</code>. Take a look inside <a
|
||||
href="api/demo/org/apache/lucene/demo/FileDocument.html">FileDocument</a>. It's not particularly
|
||||
complicated. It just adds fields to the <a
|
||||
href="api/core/org/apache/lucene/document/Document.html">Document</a>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
As you can see there isn't much to creating an index. The devil is in the details. You may also
|
||||
wish to examine the other samples in this directory, particularly the <code><a
|
||||
href="api/core/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a></code> class. It is a bit more
|
||||
wish to examine the other samples in this directory, particularly the <a
|
||||
href="api/demo/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a> class. It is a bit more
|
||||
complex but builds upon this example.
|
||||
</p>
|
||||
|
||||
|
|
@ -102,29 +102,29 @@ complex but builds upon this example.
|
|||
<section id="Searching Files"><title>Searching Files</title>
|
||||
|
||||
<p>
|
||||
The <code><a href="api/core/org/apache/lucene/demo/SearchFiles.html">SearchFiles</a></code> class is
|
||||
quite simple. It primarily collaborates with an <code><a
|
||||
href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a></code>, <code><a
|
||||
href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a></code>
|
||||
(which is used in the <code><a
|
||||
href="api/core/org/apache/lucene/demo/IndexFiles.html">IndexFiles</a></code> class as well) and a
|
||||
<code><a href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a></code>. The
|
||||
The <a href="api/demo/org/apache/lucene/demo/SearchFiles.html">SearchFiles</a> class is
|
||||
quite simple. It primarily collaborates with an <a
|
||||
href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a>, <a
|
||||
href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a>
|
||||
(which is used in the <a
|
||||
href="api/core/org/apache/lucene/demo/IndexFiles.html">IndexFiles</a> class as well) and a
|
||||
<a href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a>. The
|
||||
query parser is constructed with an analyzer used to interpret your query text in the same way the
|
||||
documents are interpreted: finding the end of words and removing useless words like 'a', 'an' and
|
||||
'the'. The <code><a href="api/core/org/apache/lucene/search/Query.html">Query</a></code> object contains
|
||||
the results from the <code><a
|
||||
href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a></code> which is passed to
|
||||
the searcher. Note that it's also possible to programmatically construct a rich <code><a
|
||||
href="api/core/org/apache/lucene/search/Query.html">Query</a></code> object without using the query
|
||||
'the'. The <a href="api/core/org/apache/lucene/search/Query.html">Query</a> object contains
|
||||
the results from the <a
|
||||
href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a> which is passed to
|
||||
the searcher. Note that it's also possible to programmatically construct a rich <a
|
||||
href="api/core/org/apache/lucene/search/Query.html">Query</a> object without using the query
|
||||
parser. The query parser just enables decoding the <a href="queryparsersyntax.html">Lucene query
|
||||
syntax</a> into the corresponding <code><a
|
||||
href="api/core/org/apache/lucene/search/Query.html">Query</a></code> object. Search can be executed in
|
||||
syntax</a> into the corresponding <a
|
||||
href="api/core/org/apache/lucene/search/Query.html">Query</a> object. Search can be executed in
|
||||
two different ways:
|
||||
<ul>
|
||||
<li>Streaming: A <code><a href="api/core/org/apache/lucene/search/HitCollector.html">HitCollector</a></code> subclass
|
||||
<li>Streaming: A <a href="api/core/org/apache/lucene/search/Collector.html">Collector</a> subclass
|
||||
simply prints out the document ID and score for each matching document.</li>
|
||||
<li>Paging: Using a <code><a href="api/core/org/apache/lucene/search/TopDocCollector.html">TopDocCollector</a></code>
|
||||
the search results are printed in pages, sorted by score (i. e. relevance).</li>
|
||||
<li>Paging: Using a <a href="api/core/org/apache/lucene/search/TopScoreDocCollector.html">TopScoreDocCollector</a>
|
||||
the search results are printed in pages, sorted by score (i. e. relevance).</li>
|
||||
</ul>
|
||||
</p>
|
||||
|
||||
|
|
|
|||
|
|
@ -62,8 +62,8 @@ the jars included in the <code>WEB-INF/lib</code> directory in the <code>lucenew
|
|||
</p>
|
||||
<p>
|
||||
You'll notice that this file includes the same header and footer as <code>index.jsp</code>. From
|
||||
there it constructs an <code><a
|
||||
href="api/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a></code> with the
|
||||
there it constructs an <a
|
||||
href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a> with the
|
||||
<code>indexLocation</code> that was specified in <code>configuration.jsp</code>. If there is an
|
||||
error of any kind in opening the index, it is displayed to the user and the boolean flag
|
||||
<code>error</code> is set to tell the rest of the sections of the jsp not to continue.
|
||||
|
|
@ -76,38 +76,38 @@ default value. If the criteria isn't provided then a servlet error is thrown (i
|
|||
this is the result of url tampering or some form of browser malfunction).
|
||||
</p>
|
||||
<p>
|
||||
The jsp moves on to construct a <code><a
|
||||
href="api/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a></code> to
|
||||
analyze the search text. This matches the analyzer used during indexing (<code><a
|
||||
href="api/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a></code>), which is generally
|
||||
recommended. This is passed to the <code><a
|
||||
href="api/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a></code> along with the
|
||||
criteria to construct a <code><a href="api/org/apache/lucene/search/Query.html">Query</a></code>
|
||||
The jsp moves on to construct a <a
|
||||
href="api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html">StandardAnalyzer</a> to
|
||||
analyze the search text. This matches the analyzer used during indexing (<a
|
||||
href="api/demo/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a>), which is generally
|
||||
recommended. This is passed to the <a
|
||||
href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a> along with the
|
||||
criteria to construct a <a href="api/core/org/apache/lucene/search/Query.html">Query</a>
|
||||
object. You'll also notice the string literal <code>"contents"</code> included. This specifies
|
||||
that the search should cover the <code>contents</code> field and not the <code>title</code>,
|
||||
<code>url</code> or some other field in the indexed documents. If there is any error in
|
||||
constructing a <code><a href="api/org/apache/lucene/search/Query.html">Query</a></code> object an
|
||||
constructing a <a href="api/org/apache/lucene/search/Query.html">Query</a> object an
|
||||
error is displayed to the user.
|
||||
</p>
|
||||
<p>
|
||||
In the next section of the jsp the <code><a
|
||||
href="api/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a></code> is asked to search
|
||||
In the next section of the jsp the <a
|
||||
href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a> is asked to search
|
||||
given the query object. The results are returned in a collection called <code>hits</code>. If the
|
||||
length property of the <code>hits</code> collection is 0 (meaning there were no results) then an
|
||||
error is displayed to the user and the error flag is set.
|
||||
</p>
|
||||
<p>
|
||||
Finally the jsp iterates through the <code>hits</code> collection, taking the current page into
|
||||
account, and displays properties of the <code><a
|
||||
href="api/org/apache/lucene/document/Document.html">Document</a></code> objects we talked about in
|
||||
account, and displays properties of the <a
|
||||
href="api/core/org/apache/lucene/document/Document.html">Document</a> objects we talked about in
|
||||
the first walkthrough. These objects contain "known" fields specific to their indexer (in this case
|
||||
<code><a href="api/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a></code> constructs a document
|
||||
<a href="api/demo/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a> constructs a document
|
||||
with "url", "title" and "contents").
|
||||
</p>
|
||||
<p>
|
||||
Please note that in a real deployment of Lucene, it's best to instantiate <code><a
|
||||
href="api/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a></code> and <code><a
|
||||
href="api/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a></code> once, and then
|
||||
Please note that in a real deployment of Lucene, it's best to instantiate <a
|
||||
href="api/core/org/apache/lucene/search/IndexSearcher.html">IndexSearcher</a> and <a
|
||||
href="api/core/org/apache/lucene/queryParser/QueryParser.html">QueryParser</a> once, and then
|
||||
share them across search requests, instead of re-instantiating per search request.
|
||||
</p>
|
||||
</section>
|
||||
|
|
@ -115,9 +115,9 @@ share them across search requests, instead of re-instantiating per search reques
|
|||
<section id="More sources (developers)"><title>More sources (developers)</title>
|
||||
<p>
|
||||
There are additional sources used by the web app that were not specifically covered by either
|
||||
walkthrough. For example the HTML parser, the <code><a
|
||||
href="api/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a></code> class and <code><a
|
||||
href="api/org/apache/lucene/demo/HTMLDocument.html">HTMLDocument</a></code> class. These are very
|
||||
walkthrough. For example the HTML parser, the <a
|
||||
href="api/demo/org/apache/lucene/demo/IndexHTML.html">IndexHTML</a> class and <a
|
||||
href="api/demo/org/apache/lucene/demo/HTMLDocument.html">HTMLDocument</a> class. These are very
|
||||
similar to the classes covered in the first example, with properties specific to parsing and
|
||||
indexing HTML. This is beyond our scope; however, by now you should feel like you're "getting
|
||||
started" with Lucene.
|
||||
|
|
|
|||
Loading…
Reference in New Issue