Merge pull request #7639 from pazis/stax

BAEL-3220 Parsing an XML File Using StAX

xml/src/main/java/com/baeldung/xml/stax/StaxParser.java

@@ -0,0 +1,74 @@
+package com.baeldung.xml.stax;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.util.List;
+import java.util.ArrayList;
+
+import javax.xml.stream.events.XMLEvent;
+import javax.xml.stream.XMLEventReader;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.events.Attribute;
+import javax.xml.stream.events.EndElement;
+import javax.xml.stream.events.StartElement;
+import javax.xml.namespace.QName;
+
+public class StaxParser {
+
+    public static List<WebSite> parse(String path) {
+        List<WebSite> websites = new ArrayList<WebSite>();
+        WebSite website = null;
+        XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
+        try {
+            XMLEventReader reader = xmlInputFactory.createXMLEventReader(new FileInputStream(path));
+            while (reader.hasNext()) {
+                XMLEvent nextEvent = reader.nextEvent();
+                if (nextEvent.isStartElement()) {
+                    StartElement startElement = nextEvent.asStartElement();
+                    switch (startElement.getName()
+                        .getLocalPart()) {
+                    case "website":
+                        website = new WebSite();
+                        Attribute url = startElement.getAttributeByName(new QName("url"));
+                        if (url != null) {
+                            website.setUrl(url.getValue());
+                        }
+                        break;
+                    case "name":
+                        nextEvent = reader.nextEvent();
+                        website.setName(nextEvent.asCharacters()
+                            .getData());
+                        break;
+                    case "category":
+                        nextEvent = reader.nextEvent();
+                        website.setCategory(nextEvent.asCharacters()
+                            .getData());
+                        break;
+                    case "status":
+                        nextEvent = reader.nextEvent();
+                        website.setStatus(nextEvent.asCharacters()
+                            .getData());
+                        break;
+                    }
+                }
+                if (nextEvent.isEndElement()) {
+                    EndElement endElement = nextEvent.asEndElement();
+                    if (endElement.getName()
+                        .getLocalPart()
+                        .equals("website")) {
+                        websites.add(website);
+                    }
+                }
+            }
+        } catch (XMLStreamException xse) {
+            System.out.println("XMLStreamException");
+            xse.printStackTrace();
+        } catch (FileNotFoundException fnfe) {
+            System.out.println("FileNotFoundException");
+            fnfe.printStackTrace();
+        }
+        return websites;
+    }
+
+}

xml/src/main/java/com/baeldung/xml/stax/WebSite.java

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+package com.baeldung.xml.stax;
+public class WebSite {
+
+    private String url;
+    private String name;
+    private String category;
+    private String status;
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getCategory() {
+        return category;
+    }
+
+    public void setCategory(String category) {
+        this.category = category;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+}

xml/src/test/java/com/baeldung/xml/stax/StaxParserUnitTest.java

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+package com.baeldung.xml.stax;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.util.List;
+
+import org.junit.Test;
+
+
+public class StaxParserUnitTest {
+    
+    @Test
+    public void givenWebsitesXML_whenParsed_thenNotNull() {
+        List<WebSite> websites = StaxParser.parse("src/test/resources/xml/websites.xml");
+        assertNotNull(websites);
+    }
+
+    @Test
+    public void givenWebsitesXML_whenParsed_thenSizeIsThree() {
+        List<WebSite> websites = StaxParser.parse("src/test/resources/xml/websites.xml");
+        assertEquals(3, websites.size());
+    }
+    
+    @Test
+    public void givenWebsitesXML_whenParsed_thenLocalhostExists() {
+        List<WebSite> websites = StaxParser.parse("src/test/resources/xml/websites.xml");
+        assertEquals("Localhost", websites.get(2).getName());
+    }
+}

xml/src/test/resources/xml/websites.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<websites>
+    <website url="https://baeldung.com">
+        <name>Baeldung</name>
+        <category>Online Courses</category>
+        <status>Online</status>
+    </website>
+    <website url="http://example.com">
+        <name>Example</name>
+        <category>Examples</category>
+        <status>Offline</status>
+    </website>
+    <website url="http://localhost:8080">
+        <name>Localhost</name>
+        <category>Tests</category>
+        <status>Offline</status>
+    </website>
+</websites>