1. 新建立一個web專案,並匯入jar包
   
   jar包下載
   或者新建一個maven專案,匯入以下依賴

   2.建立web入口

<?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>helloworld</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
    <servlet>
        <servlet-name>JAX-RS REST Servlet</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.helloworld</param-value>//這裡要寫自己的存放controller的package
        </init-param
 
>

        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>JAX-RS REST Servlet</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app>

3.編寫前端接受引數

package helloworld;

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;

@Path("/")
public class Demo {
    @GET
    @Path("{name}")
    @Produces(MediaType.APPLICATION_JSON)//可以返回json,根據前端需求編寫
    public String  show(@PathParam("name")String name){
        String str = "{name:\"hello\"}";
        System.out.println(name);
        return str;
    }
}

4.訪問
呼叫 http:localhost:8080/專案名/rest/helloworld
就可以在後臺接收到helloworld