java代码如何将对象转为xml呢?

xml和对象之间相互转换
是我们日常开发中常常需面对的操作
那么如何实现xml和对象之间相互转换呢? 下文笔者将一一道来，如下所示

实现思路:
	使用xmlRootElement
	Path,Produces注解
	定义设置相关的xml元素
	然后即可将类使用xml输出

 
/*
* 这里是java265.com
* 定义的java对象转换为xml的方法分享
*/
package com.java265.rest.bean; 
import javax.xml.bind.annotation.XmlRootElement; 
 
@XmlRootElement 
public class User { 
private String userId; 
private String userName; 
private String age; 
public User() {}; 
public User(String userId, String userName, String age) { 
this.userId = userId; 
this.userName = userName; 
this.age = age; 
} 
public String getUserId() { 
return userId; 
} 
public void setUserId(String userId) { 
this.userId = userId; 
} 
public String getUserName() { 
return userName; 
} 
public void setUserName(String userName) { 
this.userName = userName; 
} 
public String getAge() { 
return age; 
} 
public void setAge(String age) { 
this.age = age; 
} 
}

package com.java265.rest.resources; 
import java.util.Arraylist; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import javax.ws.rs.Path; 
import javax.ws.rs.Produces; 
import javax.ws.rs.PathParam; 
import javax.ws.rs.core.MediaType; 
import javax.ws.rs.DELETE; 
import javax.ws.rs.GET; 
import javax.ws.rs.POST; 
import javax.ws.rs.PUT; 
import com.waylau.rest.bean.User; 
@Path("/users") 
public class UserResource { 
private static Map<String,User> userMap = new HashMap<String,User>();//存储用户 
/** 
* 查询所有 
* @return 
*/ 
@GET 
@Produces(MediaType.APPLICATION_XML) 
public List<i></i>t<User> getAllUsers(){ 
List<User> users = new ArrayList<User>(); 
User u1 = new User("001","WayLau","26"); 
User u2 = new User("002","King","23"); 
User u3 = new User("003","Susan","21"); 
userMap.put(u1.getUserId(), u1); 
userMap.put(u2.getUserId(), u2); 
userMap.put(u3.getUserId(), u3); 
users.addAll( userMap.values() ); 
return users; 
} 
@GET 
@Path("/getUserXml") 
@Produces(MediaType.APPLICATION_XML) 
public User getUserXml() { 
User user = new User(); 
user.setAge("18"); 
user.setUserId("8888"); 
user.setUserName("maoxiaomao"); 
return user; 
} 
}