Stax解析XML的简单实例

关键字解释：

Stax:Streaming API for XML（用于读写XML的流接口）

xml文件代码：

<?xml version="1.0"?>
<service>
    <item>
        <task>test</task>
        <strategy>repeat</strategy>
    </item>
    <item>
        <task>WebpageRespTask</task>
        <strategy>repeat</strategy>
    </item>
</service>  

Java代码：Junit4 testcase:TestStax

package unit_test;

import java.io.InputStream;

import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.events.XMLEvent;

import org.junit.Test;

public class TestStax {
	//基于光标的解析方式
	@Test
	public void cursorBased() {
		 XMLInputFactory factory = XMLInputFactory.newInstance();
         InputStream is = null;
         is = TestStax.class.getClassLoader().getResourceAsStream("service.xml");
         XMLStreamReader  reader = null;
         try {
        	 reader = factory.createXMLStreamReader(is);

			while (reader.hasNext())
			 {
				int type = reader.next();
//				 System.out.println(reader.next());
//				 if (type==XMLStreamConstants.START_DOCUMENT||type==XMLStreamConstants.END_DOCUMENT) {
//					 System.out.println(reader..toString());
//				}
                 if(type==
						XMLStreamConstants.START_ELEMENT||type==XMLStreamConstants.END_ELEMENT){
					System.out.println(reader.getName().toString());
				}

				 else if(type==XMLStreamConstants.CHARACTERS) {
				    System.out.println(reader.getText().toString().trim());
				}
			 }
		}
         catch (XMLStreamException e) {
			e.printStackTrace();
		}
      }

	//基于迭代的解析方式
	@Test
	public void iteratorBased()
	{
		 XMLInputFactory factory = XMLInputFactory.newInstance();
         InputStream is = null;
         is = TestStax.class.getClassLoader().getResourceAsStream("service.xml");
         XMLEventReader  reader = null;
         try {
        	 reader = factory.createXMLEventReader(is);

			while (reader.hasNext())
			 {
				 XMLEvent event = reader.nextEvent();
		    		if (event.isStartElement()) {
					String name = event.asStartElement().getName().toString();
					if (name.equals("strategy")) {
						System.out.println(reader.getElementText());
					}

				}
			 }
		}
         catch (XMLStreamException e) {
			e.printStackTrace();
		}
	}
}