jersey构建rest服务返回json数据

1. eclipse 创建 dynamic web project

2. 将jersey相关jar包放到libs目录下

3. web.xml 增加 jersey 相关内容

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>restDemo</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
   
     <servlet>
      <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>
      com.sun.jersey.spi.container.servlet.ServletContainer
    </servlet-class>
      <init-param>
        <param-name>com.sun.jersey.config.property.packages</param-name>
        <param-value>com.huawei.rest.resources</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
      <servlet-name>Jersey REST Service</servlet-name>
      <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
   
</web-app>

　4. 创建 resource 类

package com.huawei.rest.resources;
 
import javax.ws.rs.GET;  
import javax.ws.rs.Path;  
import javax.ws.rs.Produces;  
import javax.ws.rs.PathParam;  
import javax.ws.rs.core.MediaType;  
   
@Path("/hello")  
public class HelloResource {  
    @GET 
    @Produces(MediaType.TEXT_PLAIN)  
    public String sayHello() {  
        return "hello jersey , first demo" ;  
    }  
    
       
    @GET 
    @Path("/{param}")    
    @Produces("text/plain;charset=UTF-8")  
    public String sayHelloToUTF8(@PathParam("param") String username) {  
        return "Hello " + username;  
    }  
     
    @GET 
    @Path("/getuser")  
    @Produces(MediaType.APPLICATION_JSON)  
    public User getUserJson() {  
     User user  = new User();  
     user.setAge(27);  
     user.setUserid("005");  
     user.setUsername("Fmand");  
     return user;  
    }
       
}  

5. 创建 user 类

package com.huawei.rest.resources;
 
import javax.xml.bind.annotation.XmlRootElement;
 
@XmlRootElement
public class User {
    int age;
    String userid;
    String username;
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        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;
    }
}