xml 解包

解析目标:test.xml

<?xml version="1.0" encoding="UTF-8"?>
<Root>
	<Entity1 title="abc">
		<Entity2>a</Entity2>
	</Entity1>
	
	<Entity1 title="cba">
		<Entity2>b</Entity2>
	</Entity1>
	
	<Entity1 title="nba">
		<Entity2>c</Entity2>
	</Entity1>
</Root>

构建Root的子元素Entity1类

package com.my.study.entity;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "Entity1")
public class Entity1 {
	@XmlAttribute(name = "title", required = true)
	String title;

	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}

	@XmlElement(name = "Entity2", required = true, type = String.class)
	String entity2;

	public String getEntity2() {
		return entity2;
	}
	public void setEntity2(String entity2) {
		this.entity2 = entity2;
	}
	
	public String toString(){
		return "[Entity1][title:"+ title +"][Entity2:"+entity2+"]";
	}
}

构建Root类

package com.my.study.entity;

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "Root")
public class Root {
	
	@XmlElement(name = "Entity1", required = true, type = Entity1.class)
	List<Entity1> entity1s;

	public List<Entity1> getEntity1s() {
		return entity1s;
	}

	public void setEntity1s(List<Entity1> entity1s) {
		this.entity1s = entity1s;
	}
	
	public String toString(){
		StringBuffer strBuf = new StringBuffer();
		for( Entity1 e : entity1s )
			strBuf.append(e.toString()).append("\n");
		return strBuf.toString();
	}
}

编写main方法类

package com.my.study;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

import com.my.study.entity.Root;


public class MyTest {
	public static void main(String[] args) {
		try {
			JAXBContext context = JAXBContext.newInstance(Root.class);
			Unmarshaller um = context.createUnmarshaller();
			
			Root result = (Root)um.unmarshal(new FileInputStream(new File("./test.xml")));

			System.out.println(result.toString());
		} catch (JAXBException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}
}

运行结果为:
[Entity1][title:abc][Entity2:a]
[Entity1][title:cba][Entity2:b]
[Entity1][title:nba][Entity2:c]