SpringMVC Interceptor配置过程

自定义拦截器步骤

1、创建拦截器类实现HandlerInterceptor接口

2、在spring配置拦截器

3、测试拦截器拦截效果

 

具体实现

1、创建拦截器类实现HandlerInterceptor接口

在interceptor包中创建MyInterceptor1.java

package com.wjb.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyInterceptor1 implements HandlerInterceptor {
    @Override//在目标方法执行之前执行
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle....");
        String param = request.getParameter("param");
        if("yes".equals(param)){
            return true;
        }else{
            request.getRequestDispatcher("/error.jsp").forward(request,response);
            return false;//返回true代表放行  返回false代表不放行
        }
    }

    @Override//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) throws Exception {
        modelAndView.addObject("name","pubg捕食者");
        System.out.println("postHandle....");
    }

    @Override//在流程执行完毕后执行
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion....");
    }
}

2、在spring配置拦截器

在spring-mvc.xml中

 <!--配置拦截器-->
    <mvc:interceptors>
        
            <!--对哪些资源执行拦截操作-->
            <mvc:mapping path="/**"/>
            <bean class="com.wjb.interceptor.MyInterceptor1"/>
        </mvc:interceptor>
    </mvc:interceptors>

 

3、测试拦截器拦截效果
在controller中编写测试用例

package com.wjb.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@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;
    }

}