SpringMVC框架（2）之（2.5 Restful支持&配置静态资源过滤）

刺骨的言语ヽ痛彻心扉 2022-04-08 10:30 112阅读 0赞

## Restful支持 ##

**1. 什么是Restful：**  
Restful是软件开发的理念； HTTP进行了很好地诠释；

**2. URL的Restful实现（较简洁）：**  
Restful的URL：http: // localhost:8080/items/editItems **/** 1&…  
正常的URL：http: // localhost:8080/items/editItems **.action?** id=1&…

**需求：**  
根据 id查看商品信息，使用 Restful实现，返回 Json；  
**步骤：**  
**1. DispatcherServlet的配置 url-pattern只能是“/”；** （Restful时 web.xml中 **url-pattern**只能是“/” `<url-pattern>/</url-pattern>`，不能是`*.action`等其他）；  
**2. 参数通过URL传递；**  
① **@RequestMapping**中指定 Restful的 url参数，用 \{ \}包起来：@RequestMapping("/viewItems/\{id\}/\{name\}")  
② **@PathVariable**将 url中 \{ \}包起来的参数和后面跟的形参绑定：(@PathVariable(“id”) Integer id)  
③ 若返回 json格式数据，在返回类型前加 @ResponseBody注解；

@RequestMapping("/viewItems/{id}/{name}")
    public @ResponseBody ItemsCustom viewItems(@PathVariable("id") Integer id) throws Exception{
    }

**3. springmvc.xml 文件中配置静态资源过滤；**

<mvc:resources location="/js/" mapping="/js/**"></mvc:resources>

**1. web.xml**

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://java.sun.com/xml/ns/javaee"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    		  http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd"
             version="3.0">
             
             
             <servlet>
             	<servlet-name>springmvc</servlet-name>
             	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    	        <init-param> 
    	         	<param-name>contextConfigLocation</param-name>
    	         	<param-value>classpath:spring/springmvc.xml</param-value>
    	        </init-param>
    	        <load-on-startup>1</load-on-startup> 
             </servlet>
             <servlet-mapping>
             	<servlet-name>springmvc</servlet-name>
             	<url-pattern>*.action</url-pattern> 
             </servlet-mapping>
    
              
             <servlet>
             	<servlet-name>springmvc_restful</servlet-name>
             	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    	        <init-param> 
    	         	<param-name>contextConfigLocation</param-name>
    	         	<param-value>classpath:spring/springmvc.xml</param-value>
    	        </init-param>
    	        <load-on-startup>1</load-on-startup> 
             </servlet>
             <servlet-mapping>
             	<servlet-name>springmvc_restful</servlet-name>
             	
             	<url-pattern>/</url-pattern> 
             </servlet-mapping>
    
             
             
             <context-param> // 加载spring容器
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:spring/applicationContext-*.xml</param-value>
             </context-param>
             <listener> // 加载监听
                 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
             </listener>
    
             <welcome-file-list>         	
             </welcome-file-list>
    </web-app>

**2. ItemsController.java**

@Controller
    @RequestMapping("/items")
    public class ItemsController{
    	
        @Autowired
        private ItemsCustomMapper itemsCustomMapper;
        @Autowired
        private ItemsMapper itemsMapper;
    
        public List<ItemsCustom> findItemsList(ItemsQueryVo itemsQueryVo)throws Exception{
        	return itemsCustomMapper.findItemsList(itemsQueryVo);
        }
        
        //根据商品id查看商品信息restful接口
        //@RequestMapping中指定Restful的url的参数,用{}包起来
        @RequestMapping("/viewItems/{id}/{name}")
        public @ResponseBody ItemsCustom viewItems(@PathVariable("id") Integer id) throws Exception{
        	Items items=itemsMapper.selectByPrimaryKey(id);
        	return itemsCustom;
        }
    }

**3. ItemsList.jsp**

<body>
        <table width="100%" border="1">
           <tr><td>商品名称</td><td>商品价格</td><td>订购日期</td><td>商品描述</td><td>操作</td></tr>
           <c:forEach items="${items}" var="item">
              <tr><td>${item.name}</td>
                  <td>${item.price}</td>
                  <td><fmt:formatDate value="${item.createtime}" pattern="yyyy-MM-dd"/></td>
                  <td>${item.detail}</td>
                  <td>
                    <a href="${pageContext.request.contextPath}/items/editItems.action?id=${item.id}">修改</a>
                  </td>
    
                  <td>
                    <a href="${pageContext.request.contextPath}/items/viewItems/${item.id}">查看商品</a>
                  </td>
    
              </tr>
           </c:forEach>
        </table>
    </body>

**4. springmvc.xml**  
（**location** 即文件 xx， **mapping** 被映射成 xx；）