用jersey写简单Restful接口

1.在myeclipse中新建一个Dynamic Web Project

2.下载jar包，地址在这里

3.restful service代码

package com.qy;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

//这里@Path定义了类的层次路径。 
//指定了资源类提供服务的URI路径。
@Path("userService")
public class HelloRestFul {
    private String name= "";
    
    @GET    //get请求
    @Path("/hello/{name}")    //指定了资源类提供服务的URI路径。
    @Produces(MediaType.TEXT_XML)    //返回xml类型
    public String sayHello(@PathParam("name") String name){
        this.name = name;
        System.out.println("Hello "+this.name);
        return "<root>" + "<Say>" + "Hello "+name + "</Say>" + "</root>";
    }
    
    @GET
    @Path("/bye/{name}")
    @Produces(MediaType.TEXT_XML)
    public String bye(@PathParam("name") String name) {
        System.out.println("Bye "+ name);
        return "<root>" + "<Say>" + "bye "+name + "</Say>" + "</root>";
    }
}

4.在web.xml中配置

<?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_3_0.xsd"
    version="3.0">
    <display-name>RESTful</display-name>
    <servlet>
        <servlet-name>Jersey REST Service</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>   <!--restful容器类-->
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>    <!--自动加载的包的参数-->
            <param-value>com.qy</param-value>     <!--restful自动加载指定包下的controller-->
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey REST Service</servlet-name>
        <url-pattern>/rest/*</url-pattern>   <!--请求地址时需要在项目和servicepath之间加上这个rest-->
    </servlet-mapping>
</web-app>

5.测试service接口是否成功

6.确定service接口没问题了，在java中写调用接口的方法，jersey调用接口方法如下

    //创建请求对象
    ClientConfig config = new DefaultClientConfig();
    Client client = Client.create(config);
    WebResource resource = client.resource(BASE_URI);    //具体项目的WebResource
    //具体路径的WebResource
    WebResource helloResource = resource.path("rest").path(PATH_Hello + name); 
　　 //返回请求结果的xml
    String responseString = helloResource.accept(MediaType.TEXT_XML).get(String.class);
　　 //返回请求结果的状态
    String clientResponseString = helloResource.accept(MediaType.TEXT_XML).get(ClientResponse.class).toString();

7.调用接口

package com.qy;

import javax.ws.rs.core.MediaType;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;

/**
 * 调用接口
 */
public class HelloRestFulClient {
    public static final String BASE_URI = "http://localhost:8080/RESTful";
    public static final String PATH_Hello = "/userService/hello/";
    public static final String PATH_Bye = "/userService/bye/";
     
    public static void main(String[] args) {
    //参数
    String name = "qy";
    
    //创建请求对象
    ClientConfig config = new DefaultClientConfig();
    Client client = Client.create(config);
    WebResource resource = client.resource(BASE_URI);    //具体项目的WebResource
    //路径
    WebResource helloResource = resource.path("rest").path(PATH_Hello + name);  
    System.out.println("Client Response 返回状态");
    getClientResponse(helloResource);
    System.out.println("Response 返回 xml" );
    getResponse(helloResource);
    System.out.println("----------------------------------------------------");
    WebResource byeResource = resource.path("rest").path(PATH_Bye + name);
    System.out.println("Client Response 返回状态");
    getClientResponse(byeResource);
    System.out.println("Response 返回 xml" );
    getResponse(byeResource);
    }
     
    /**
    * 调用WebResource,返回客户端请求状态。
    * GET http://localhost:8080/RESTful/rest/userService/hello/qiuyu
    * 返回请求结果状态“200 OK”。
    */
    private static String getClientResponse(WebResource resource) {
        String clientResponseString = resource.accept(MediaType.TEXT_XML)
                                    .get(ClientResponse.class).toString();
        System.out.println(clientResponseString);
        return clientResponseString;
    }
     
    /**
    * 调用WebResource,返回请求结果XML
    * <root><Say>bye qiuyu</Say></root>
    */
    private static String getResponse(WebResource resource) {
        String responseString = resource.accept(MediaType.TEXT_XML)
                                .get(String.class);
        System.out.println(responseString);
        return responseString;
    }
}

8.执行返回结果

源码