个人博客
1.学到的东西
03-SpringMVC拦截器-快速入门(应用)
自定义拦截器很简单，只有如下三步：
①创建拦截器类实现HandlerInterceptor接口
②配置拦截器
③测试拦截器的拦截效果
编写拦截器：
public class MyInterceptor1 implements HandlerInterceptor {
//在目标方法执行之前 执行
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException, IOException {
System.out.println("preHandle.....");
}
//在目标方法执行之后 视图对象返回之前执行
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
System.out.println("postHandle...");
}
//在流程都执行完毕后 执行
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
System.out.println("afterCompletion....");
}
}
配置：在SpringMVC的配置文件中配置
<!--配置拦截器-->
<mvc:interceptors>
<mvc:interceptor>
<!--对哪些资源执行拦截操作-->
<mvc:mapping path="/**"/>
<bean class="com.itheima.interceptor.MyInterceptor1"/>
</mvc:interceptor>
</mvc:interceptors>
编写测试程序测试：
编写Controller,发请求到controller,跳转页面
@Controller
public class TargetController {
@RequestMapping("/target")
public ModelAndView show(){
System.out.println("目标资源执行......");
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("name","itcast");
modelAndView.setViewName("index");
return modelAndView;
}
}
页面
<html>
<body>
<h2>Hello World! ${name}</h2>
</body>
</html>
2.明日计划
详细学习SpringMVC拦截器