使用JAXB实现JAVA对象和XML字符串的互相转换

关于JAXB的介绍，见：http://blog.csdn.net/qq_32786873/article/details/71715254

测试类：

package com.solin.test;

import java.util.ArrayList;
import java.util.List;

public class Test {
	public static void main(String[] args) {
		Student student = new Student();
		student.setName("邪恶小法师");
		student.setAge("110");
		student.setSex("男");
		List list = new ArrayList<>();
		Student.Friend f1 = new Student.Friend();
		f1.setName("德玛西亚之力");
		f1.setAge("888");
		f1.setSex("男");
		
		Student.Friend f2 = new Student.Friend();
		f2.setName("无双剑姬");
		f2.setAge("898");
		f2.setSex("女");
		
		list.add(f1);
		list.add(f2);
		student.setFriend(list);
		
		//将java对象转换为XML字符串
		String xmlStr = XmlAndJavaObjectConvert.convertToXml(student);
		System.out.println(xmlStr);
		
		//将xml字符串转换为java对象
        System.out.println(XmlAndJavaObjectConvert.convertXmlStrToObject(Student.class, xmlStr));
	}
}

实体类：

package com.solin.test;

import java.util.List;

import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

//XML文件中的根标识  
@XmlRootElement(name = "Student") 
//控制JAXB 绑定类中属性和字段的排序  
@XmlType(propOrder = {   
   "name",   
   "age",   
   "sex",   
   "friend"
})  
public class Student {
	private String name;
	private String age;
	private String sex;
	private List friend;
	
	public String getName() {
		return name;
	}

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

	public String getAge() {
		return age;
	}

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

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	@XmlElementWrapper(name="friendList")
	public List getFriend() {
		return friend;
	}

	public void setFriend(List friend) {
		this.friend = friend;
	}

	@Override
	public String toString() {
		return "Student [name=" + name + ", age=" + age + ", sex=" + sex + ", friendList=" + friend + "]";
	}

	public static class Friend{
		private String name;
		private String age;
		private String sex;
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		public String getAge() {
			return age;
		}
		public void setAge(String age) {
			this.age = age;
		}
		public String getSex() {
			return sex;
		}
		public void setSex(String sex) {
			this.sex = sex;
		}
		@Override
		public String toString() {
			return "Friend [name=" + name + ", age=" + age + ", sex=" + sex + "]";
		}
	}
}

工具类：

package com.solin.test;

import java.io.StringReader;
import java.io.StringWriter;

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

public class XmlAndJavaObjectConvert {
	/** 
     * 将对象直接转换成String类型的 XML输出 
     *  
     * @param obj 
     * @return 
     */  
    public static String convertToXml(Object obj) {  
        // 创建输出流  
        StringWriter sw = new StringWriter();  
        try {  
            // 利用jdk中自带的转换类实现  
            JAXBContext context = JAXBContext.newInstance(obj.getClass());  
  
            Marshaller marshaller = context.createMarshaller();  
            // 格式化xml输出的格式  
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,  
                    Boolean.TRUE);  
            // 将对象转换成输出流形式的xml  
            marshaller.marshal(obj, sw);  
        } catch (JAXBException e) {  
            e.printStackTrace();  
        }  
        return sw.toString();  
    }  
    
    /** 
     * 将String类型的xml转换成对象 
     */  
    public static Object convertXmlStrToObject(Class clazz, String xmlStr) {  
        Object xmlObject = null;  
        try {  
            JAXBContext context = JAXBContext.newInstance(clazz);  
            // 进行将Xml转成对象的核心接口  
            Unmarshaller unmarshaller = context.createUnmarshaller();  
            StringReader sr = new StringReader(xmlStr); 
            xmlObject = unmarshaller.unmarshal(sr);  
        } catch (JAXBException e) {  
            e.printStackTrace();  
        }  
        return xmlObject;  
    }  
}

输出结果如下：

    邪恶小法师
    110
    男
    
        
            888
            德玛西亚之力
            男
        
        
            898
            无双剑姬
            女
        
    


Student [name=邪恶小法师, age=110, sex=男, friendList=[Friend [name=德玛西亚之力, age=888, sex=男], Friend [name=无双剑姬, age=898, sex=女]]]