用Jersey构建RESTful服务2--JAVA对象转成XML输出

秒速五厘米 2022-04-21 15:58 190阅读 0赞

一、 总体说明

XML和JSON 是最为常用的数据交换格式。本例子演示如何将java对象，转成XML输出。

二、流程

1.在上文的例子中，创建一个包“com.waylau.rest.bean”

2.在该包下创建一个JAVA类"User"

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;
    	}
    }

注意：该类上面增加了一个注解“@XmlRootElement”，在将该类转化成XML时，说明这个是XML的根节点。

3.在“com.waylau.rest.resources”中，增加资源“UserResource“，代码如下：

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>();//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;
        }
        
     
       
    }

其中MediaType.APPLICATION\_XML说明了是以XML形式输出

在浏览器输入http://localhost:8089/RestDemo/rest/users/getUserXml，输出单个对象

![267f9e2f07082838a80989a8ba99a9014c08f102.jpg_referer_276bf8ae700e0cf3f9e07bcb3f00_x_.jpg][]

在浏览器输入 http://localhost:8089/RestDemo/rest/users 输出对象的集合

![d000baa1cd11728b2318d99ecafcc3cec3fd2c50.jpg_referer_ac9db1cfaf4bd1135dda82028c4e_x_.jpg][]

[267f9e2f07082838a80989a8ba99a9014c08f102.jpg_referer_276bf8ae700e0cf3f9e07bcb3f00_x_.jpg]: /images/20220414/2ec1db8aeed34113b332de8103bec1ac.png
[d000baa1cd11728b2318d99ecafcc3cec3fd2c50.jpg_referer_ac9db1cfaf4bd1135dda82028c4e_x_.jpg]: /images/20220414/cb5f34412dbd4c65b5d88fc546ea7b42.png