利用commons-digester3-30.jar解析xml文件

此方式解析需要commons-beanutils-1.8.3.jar的支持

Person.java类：

import java.io.Serializable;

public class Person implements Serializable {

	public String id;
	public String name;
	public int age;
	
	public Person() {
		
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}
}

data.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<people>
	<person id="1" name="Shibo Yu" age="28" />

  	<person id="2" name="Shihuan" age="45" />

  	<person id="3" name="Old Ages" age="53" />
</people>

TestDigester1.java类：

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.apache.commons.digester3.Digester;
import org.apache.log4j.Logger;
import org.xml.sax.SAXException;

import com.commonsdigester.dto.Person;

public class TestDigester1 {

	static Logger logger = Logger.getLogger(TestDigester.class);
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		Digester digester = new Digester();      
		//此方法作用是是否对XML文档进行DTD验证      
		digester.setValidating(false);    
		
		
		//addObjectCreate的作用是：当遇见people元素的时候，产生一个java.util.ArrayList对象      
		digester.addObjectCreate("people", "java.util.ArrayList");      
		//addSetProperties作用是：对people元素所含的属性赋值(即下面people/person中的对象值)      
		digester.addSetProperties("people");      
		//当遇见people/person元素的时候，产生一个com.commonsdigester.dto.Person对象      
		digester.addObjectCreate("people/person", "com.commonsdigester.dto.Person");      
		//对people/person元素所含的属性赋值给Person对象
		digester.addSetProperties("people/person");
		//当再一次遇见 people下的person元素的时候，调用ArrayList类的add()方法,add：com.commonsdigester.dto.Person对象              
		digester.addSetNext("people/person", "add", "com.commonsdigester.dto.Person");

		
		
		try {
			
			InputStream inputdata = new FileInputStream("D:\\Workspaces\\TestJavaStudy\\src\\com\\commonsdigester\\dto\\data.xml");
			List personList = (List) digester.parse(inputdata);
			for (int i = 0; i < personList.size(); i++) {
				Person person = (Person) personList.get(i);
				System.out.println(person.getId() + " -- " + person.getName() + " -- " + person.getAge());
			}
			
		} catch (IOException e) {
			logger.error("load People.xml error.", e);
		} catch (SAXException e) {
			logger.error("load People.xml error.", e);
		} 

		
	}

}

第二种xml格式的解析：
Person.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<people>
	<person id="1">
    	<name>Shibo Yu</name>
    	<age>28</age>
  	</person>
  	<person id="2">
    	<name>Shihuan</name>
    	<age>45</age>
  	</person>
  	<person id="3">
    	<name>Old Ages</name>
    	<age>53</age>
  	</person>
</people>

TestDigester2.java类：

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.apache.commons.digester3.Digester;
import org.apache.log4j.Logger;
import org.xml.sax.SAXException;

import com.commonsdigester.dto.Person;

public class TestDigester2 {

	static Logger logger = Logger.getLogger(TestDigester.class);
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		Digester digester = new Digester();      
		//此方法作用是是否对XML文档进行DTD验证      
		digester.setValidating(false);    
		
		
		//addObjectCreate的作用是：当遇见people元素的时候，产生一个java.util.ArrayList对象      
		digester.addObjectCreate("people", "java.util.ArrayList");      
		//addSetProperties作用是：对people元素所含的属性赋值(即下面people/person中的对象值)      
		digester.addSetProperties("people");      
		//当遇见people/person元素的时候，产生一个com.commonsdigester.dto.Person对象      
		digester.addObjectCreate("people/person", "com.commonsdigester.dto.Person");      
		//对people/person元素所含的属性赋值给Person对象
		
		digester.addBeanPropertySetter("people/person/name");
		digester.addBeanPropertySetter("people/person/age");
		
		digester.addSetProperties("people/person");
		//当再一次遇见 people下的person元素的时候，调用ArrayList类的add()方法,add：com.commonsdigester.dto.Person对象              
		digester.addSetNext("people/person", "add", "com.commonsdigester.dto.Person");

		
		
		try {
			
			// 解析XML文档
			InputStream input = new FileInputStream("D:\\Workspaces\\TestJavaStudy\\src\\com\\commonsdigester\\dto\\Person.xml");
			List people = (List) digester.parse(input);
			for (int i = 0; i < people.size(); i++) {
				Person person = (Person) people.get(i);
				System.out.println(person.getId() + " -- " + person.getName() + " -- " + person.getAge());
			}

		} catch (IOException e) {
			logger.error("load People.xml error.", e);
		} catch (SAXException e) {
			logger.error("load People.xml error.", e);
		} 

		
	}

}

【注】第二种解析中关注digester. addBeanPropertySetter(" people/person/name");
digester. addBeanPropertySetter(" people/person/age");这两句。
addBeanPropertySetter方法还有其它参数形式，详情可参考官方API文档。