一、 總體說明

XML和JSON 是最為常用的資料交換格式。本例子演示如何將java物件，轉成XML輸出。

二、流程

1.在上文的例子中，建立一個包“com.waylau.rest.bean”

2.在該包下建立一個JAVA類"User"

package com.waylau.rest.bean;
import javax.xml.bind.annotation.XmlRootElement;
/*
 * 使用者 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;
	}
}
 

3.在“com.waylau.rest.resources”中，增加資源“UserResource“，程式碼如下：

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>();//儲存使用者
	 /**
     * 查詢所有
     * @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;
    }
    
 
   
}
 

其中MediaType.APPLICATION_XML說明了是以XML形式輸出

在瀏覽器輸入http://localhost:8089/RestDemo/rest/users/getUserXml，輸出單個物件

在瀏覽器輸入 http://localhost:8089/RestDemo/rest/users  輸出物件的集合