通过实例学习JAVA对象转成XML输出

package com.waylau.rest.bean; 
import javax.xml.bind.annotation.XmlRootElement; 
/* *
* 用户 bean 
* @author waylau.com 
* 2014-3-17 
*/ 
@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.waylau.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<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("21"); 
user.setUserId("004"); 
user.setUserName("Amand"); 
return user; 
} 
}