Apache
/
commons-csv
mirror of https://github.com/apache/commons-csv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Format examples for fluent style

This commit is contained in:
Gary Gregory 2023-05-01 08:57:23 -04:00
parent 0bcdcfd466
commit 4ca0556f6b
1 changed files with 30 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
src/site/xdoc/user-guide.xml
View File

@ -71,16 +71,15 @@ for (CSVRecord record : records) {
for example: for example:
</p> </p>
<source>final URL url = ...; <source>final URL url = ...;
final Reader reader = new InputStreamReader(new BOMInputStream(url.openStream()), "UTF-8"); try (final Reader reader = new InputStreamReader(new BOMInputStream(url.openStream()), "UTF-8");
final CSVParser parser = CSVFormat.EXCEL.builder().setHeader().build().parse(reader); final CSVParser parser = CSVFormat.EXCEL.builder()
try { .setHeader()
.build()
.parse(reader)) {
for (final CSVRecord record : parser) { for (final CSVRecord record : parser) {
final String string = record.get("SomeColumn"); final String string = record.get("SomeColumn");
... ...
} }
} finally {
parser.close();
reader.close();
} }
</source> </source>
<p> <p>
@ -118,7 +117,10 @@ for (CSVRecord record : records) {
Indices may not be the most intuitive way to access record values. For this reason it is possible to Indices may not be the most intuitive way to access record values. For this reason it is possible to
assign names to each column in the file: assign names to each column in the file:
<source>Reader in = new FileReader(&quot;path/to/file.csv&quot;); <source>Reader in = new FileReader(&quot;path/to/file.csv&quot;);
Iterable&lt;CSVRecord&gt; records = CSVFormat.RFC4180.builder().setHeader("ID", "CustomerNo", "Name").build().parse(in); Iterable&lt;CSVRecord&gt; records = CSVFormat.RFC4180.builder()
.setHeader("ID", "CustomerNo", "Name")
.build()
.parse(in);
for (CSVRecord record : records) { for (CSVRecord record : records) {
String id = record.get("ID"); String id = record.get("ID");
String customerNo = record.get("CustomerNo"); String customerNo = record.get("CustomerNo");
@ -136,7 +138,10 @@ for (CSVRecord record : records) {
ID, CustomerNo, Name ID, CustomerNo, Name
} }
Reader in = new FileReader(&quot;path/to/file.csv&quot;); Reader in = new FileReader(&quot;path/to/file.csv&quot;);
Iterable&lt;CSVRecord&gt; records = CSVFormat.RFC4180.builder().setHeader(Headers.class).build().parse(in); Iterable&lt;CSVRecord&gt; records = CSVFormat.RFC4180.builder()
.setHeader(Headers.class)
.build()
.parse(in);
for (CSVRecord record : records) { for (CSVRecord record : records) {
String id = record.get(Headers.ID); String id = record.get(Headers.ID);
String customerNo = record.get(Headers.CustomerNo); String customerNo = record.get(Headers.CustomerNo);
@ -149,7 +154,11 @@ for (CSVRecord record : records) {
Some CSV files define header names in their first record. If configured, Apache Commons CSV can parse Some CSV files define header names in their first record. If configured, Apache Commons CSV can parse
the header names from the first record: the header names from the first record:
<source>Reader in = new FileReader(&quot;path/to/file.csv&quot;); <source>Reader in = new FileReader(&quot;path/to/file.csv&quot;);
Iterable&lt;CSVRecord&gt; records = CSVFormat.RFC4180.builder().setHeader().setSkipHeaderRecord(true).build().parse(in); Iterable&lt;CSVRecord&gt; records = CSVFormat.RFC4180.builder()
.setHeader()
.setSkipHeaderRecord(true)
.build()
.parse(in);
for (CSVRecord record : records) { for (CSVRecord record : records) {
String id = record.get("ID"); String id = record.get("ID");
String customerNo = record.get("CustomerNo"); String customerNo = record.get("CustomerNo");
@ -163,16 +172,22 @@ for (CSVRecord record : records) {
To print a CSV file with headers, you specify the headers in the format: To print a CSV file with headers, you specify the headers in the format:
</p> </p>
<source>final Appendable out = ...; <source>final Appendable out = ...;
final CSVPrinter printer = CSVFormat.DEFAULT.builder().setHeader("H1", "H2").build().print(out); final CSVPrinter printer = CSVFormat.DEFAULT.builder()
.setHeader("H1", "H2")
.build()
.print(out);
</source> </source>
<p> <p>
To print a CSV file with JDBC column labels, you specify the ResultSet in the format: To print a CSV file with JDBC column labels, you specify the ResultSet in the format:
</p> </p>
<source>final ResultSet resultSet = ...; <source>try (final ResultSet resultSet = ...) {
final CSVPrinter printer = CSVFormat.DEFAULT.builder().setHeader(resultSet).build().print(out); final CSVPrinter printer = CSVFormat.DEFAULT.builder()
.setHeader(resultSet)
.build()
.print(out);
}
</source> </source>
</subsection> </subsection>
</section> </section>
<!-- ================================================== -->
</body> </body>
</document> </document>