搭建SpringMVC框架、控制器、传值、拦截器

1、导入jre包、Spring下的包。不要忘了logging包

2、配置 web.xml

<servlet>  <servlet-name>springmvc</servlet-name>  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  <init-param>            <param-name>contextConfigLocation</param-name>    <!-- src下Spring配置文件 -->            <param-value>classpath:test.xml</param-value>        </init-param>  </servlet>  <servlet-mapping>  <servlet-name>springmvc</servlet-name><!--   <url-pattern>*.from</url-pattern> --><!--   <url-pattern>*.do</url-pattern> --><!-- 拦截所有 --> <url-pattern>/</url-pattern> </servlet-mapping>

3、生成spring的配置文件，配置命名空间不要忘了勾选mvc

<!-- 配置扫描组件 --><context:component-scan base-package="com.hp.controller"/><!-- mvc 驱动 -->  <mvc:annotation-driven/>  <!-- 视图解析 -->  <bean id="viewResolver"      class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- 视图解析路径，注意后面有个斜杠 -->    <property name="prefix" value="/WEB-INF/jsp/"/><!-- 视图解析后缀名 -->    <property name="suffix" value=".jsp"/></bean>

4、创建控制器

5、jsp与 后台交互 如何接受参数。model向页面传值

@Controller/*类似命名空间*/@RequestMapping("/a")public class HelloController {@RequestMapping("/hello")private String hello(Model model) {model.addAttribute("me", "hello word");/*返回页面*/return "index";}@RequestMapping("/hello2")private String hello2(@RequestParam(value="he") String name,Model model) {model.addAttribute("name", name);return "index";}

6. url 参数获取

@RequestMapping("/hello3/{pid}")public String hello3(@PathVariable(value="pid") String pid1){return "index";}

7、拦截器

1）编写一个拦截器类，实现HandlerInterceptor接口

public class MyInterceptor implements HandlerInterceptor{@Overridepublic void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)throws Exception {System.err.println("==请求后==");}@Overridepublic void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)throws Exception {System.err.println("==请求过程==");}@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception {System.err.println("==请求前==");String user =(String) request.getSession().getAttribute("user");String url=request.getContextPath();if (StringUtils.isEmpty(user)) {response.sendRedirect(url+"/login.jsp");return false;}return true;}}

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