BAEL-3219

Parsing an XML File Using SAX Parser

xml/src/main/java/com/baeldung/sax/SaxParserMain.java

@@ -0,0 +1,161 @@
+package com.baeldung.sax;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.SAXParser;
+import javax.xml.parsers.SAXParserFactory;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class SaxParserMain {
+    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
+        SAXParserFactory factory = SAXParserFactory.newInstance();
+        SAXParser saxParser = factory.newSAXParser();
+
+        BaeldungHandler baeldungHandler = new BaeldungHandler();
+        saxParser.parse("xml\\src\\main\\resources\\sax\\baeldung.xml", baeldungHandler);
+        System.out.println(baeldungHandler.getWebsite());
+    }
+
+    public static class BaeldungHandler extends DefaultHandler {
+        private Baeldung website;
+        private String elementValue;
+
+        @Override
+        public void characters(char[] ch, int start, int length) throws SAXException {
+            elementValue = new String(ch, start, length);
+        }
+
+        @Override
+        public void startDocument() throws SAXException {
+            website = new Baeldung();
+        }
+
+        @Override
+        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
+            switch (qName) {
+                case ARTICLES:
+                    website.setArticleList(new ArrayList<>());
+                    break;
+                case ARTICLE:
+                    website.getArticleList().add(new BaeldungArticle());
+            }
+        }
+
+        @Override
+        public void endElement(String uri, String localName, String qName) throws SAXException {
+            switch (qName) {
+                case TITLE:
+                    latestArticle().setTitle(elementValue);
+                    break;
+                case CONTENT:
+                    latestArticle().setContent(elementValue);
+                    break;
+            }
+        }
+
+        private BaeldungArticle latestArticle() {
+            List<BaeldungArticle> articleList = website.getArticleList();
+            int latestArticleIndex = articleList.size() - 1;
+            return articleList.get(latestArticleIndex);
+        }
+
+        public Baeldung getWebsite() {
+            return website;
+        }
+
+        @Override
+        public String toString() {
+            return "BaeldungHandler{" +
+                    "website=" + website +
+                    ", elementValue='" + elementValue + '\'' +
+                    '}';
+        }
+
+        private static final String ARTICLES = "articles";
+        private static final String ARTICLE = "article";
+        private static final String TITLE = "title";
+        private static final String CONTENT = "content";
+    }
+
+
+    public static class Baeldung {
+        private List<BaeldungArticle> articleList;
+
+        public List<BaeldungArticle> getArticleList() {
+            return articleList;
+        }
+
+        public void setArticleList(List<BaeldungArticle> articleList) {
+            this.articleList = articleList;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            Baeldung baeldung = (Baeldung) o;
+            return Objects.equals(articleList, baeldung.articleList);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(articleList);
+        }
+
+        @Override
+        public String toString() {
+            return "Baeldung{" +
+                    "articleList=" + articleList +
+                    '}';
+        }
+    }
+
+    public static class BaeldungArticle {
+        private String title;
+        private String content;
+
+        public String getTitle() {
+            return title;
+        }
+
+        public void setTitle(String title) {
+            this.title = title;
+        }
+
+        public String getContent() {
+            return content;
+        }
+
+        public void setContent(String content) {
+            this.content = content;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            BaeldungArticle that = (BaeldungArticle) o;
+            return Objects.equals(title, that.title) &&
+                    Objects.equals(content, that.content);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(title, content);
+        }
+
+        @Override
+        public String toString() {
+            return "BaeldungArticle{" +
+                    "title='" + title + '\'' +
+                    ", content='" + content + '\'' +
+                    '}';
+        }
+    }
+}

xml/src/main/resources/sax/baeldung.xml

@@ -0,0 +1,16 @@
+<baeldung>
+    <articles>
+        <article>
+            <title>Parsing an XML File Using SAX Parser</title>
+            <content>Lorem ipsum...</content>
+        </article>
+        <article>
+            <title>Parsing an XML File Using DOM Parser</title>
+            <content>Lorem ipsum...</content>
+        </article>
+        <article>
+            <title>Parsing an XML File Using StAX Parser</title>
+            <content>Lorem ipsum...</content>
+        </article>
+    </articles>
+</baeldung>