REST架構是一個抽象的概念，目前主要是基於HTTP協議實現，其目的是為了提高系統的可伸縮性、降低應用之間的耦合度、便於架構分布式處理程序。

在URL中設置使用如下方式: /{變量名1}/{變量名2}

在代碼中向Controller方法註入參數: (@PathVariable("變量名1") String str1,@PathVariable("變量名2") String str2)
例如：

        @RequestMapping(value="/book/{bookid}",method=RequestMethod.POST)
        @ResponseBody
        
 
public Object getBook(@PathVariable("bookid") String bookid){

            return new Book();
        }

下面是一個使用案例：

bean類：

package cn.xdl.bean;

public class Book {

    private int bid;
    private String bname;
    public int getBid() {
        return bid;
    }
    public
 
 void setBid(int bid) {
        this.bid = bid;
    }
    public String getBname() {
        return bname;
    }
    public void setBname(String bname) {
        this.bname = bname;
    }
    public Book(int bid, String bname) {
        super();
        this.bid = bid;
        this.bname = bname;
    }
    
 
public Book() {
        super();
        // TODO Auto-generated constructor stub
    }
    @Override
    public String toString() {
        return "Book [bid=" + bid + ", bname=" + bname + "]";
    }
    
}

Controller類

這裏的通信方式返回的結果是Object對象。

bean.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.1.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd">
        <!-- 
            開啟註解掃描
         -->
         <context:component-scan base-package="cn"></context:component-scan>
         <!-- 
             開啟mvc註解掃描
          -->
        <mvc:annotation-driven/>
        
        <mvc:default-servlet-handler/>
        
        
</beans>

在配置文件中一定需要指出：

<mvc:default-servlet-handler/>

否則會出現靜態資源（如js、css等資源）攔截404的錯誤。

web.xml文件

<?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">

    <servlet>
        <servlet-name>webmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:bean.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>webmvc</servlet-name>
        <url-pattern>/</url-pattern>
        
    </servlet-mapping>


</web-app>

web.xml文件過濾的url必須寫成 <url-pattern>/</url-pattern> ,因為采用REST編程風格，在url地址中只會出現/分割符號，所以只能寫成這樣 <url-pattern>/</url-pattern> ，以匹配所有的路徑。

restTest.jsp文件

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
    function insertClick(){
        $.ajax({
            url:"book/10003/hahaha",
            dataType:"JSON",
            type:"POST",
            success:function(data){
                alert( JSON.stringify(data));
            },
            error:function(){
                
            }
        });
        
    }
    function deleteClick(){
        $.ajax({
            url:"book/10003",
            dataType:"JSON",
            type:"DELETE",
            success:function(data){
                alert( JSON.stringify(data));
            },
            error:function(){
                
            }
        });
        
        
    }
    function updateClick(){
        $.ajax({
            url:"book/10003/hahaha",
            dataType:"JSON",
            type:"PUT",
            success:function(data){
                alert( JSON.stringify(data));
            },
            error:function(){
                
            }
        });
        
    }
    function findClick(){
        $.ajax({
            url:"book/10003",
            dataType:"JSON",
            type:"GET",
            success:function(data){
                alert( JSON.stringify(data));
            },
            error:function(){
                
            }
        });
        
    }

</script>
</head>
<body>
    <input onclick="insertClick()" type="button" value="增加"/><br><br>
    <input onclick="deleteClick()" type="button" value="刪除"/><br><br>
    <input onclick="updateClick()" type="button" value="修改"/><br><br>
    <input onclick="findClick()" type="button" value="查詢"/><br><br>
</body>
</html>

這裏通信方式是采用Ajax請求。

【Spring】SpringMVC之REST編程風格