SpringMVC多拦截器的执行

如果有多个拦截器，执行的顺序是在SpringMVC的配置文件里的前后顺序。

<mvc:interceptors>
　　<bean class="com.neuedu.interceptor.Inteceptor1"></bean>
　　<mvc:interceptor>
　　　　<mvc:mapping path="/test"/>
　　　　<bean class="com.neuedu.interceptor.Inteceptor2"></bean>
　　</mvc:interceptor>
</mvc:interceptors>

第一个拦截器在前面就先执行第一个拦截器的preHandle方法。

第一个拦截器

package com.neuedu.interceptor;

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

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

public class Inteceptor1 implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // TODO Auto-generated method stub
        System.out.println("first-preHandle");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        System.out.println("first-postHandle");
        
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        System.out.println("first-afterCompletion");
        
    }

}

这样第二个拦截器：

package com.neuedu.interceptor;

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

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

public class Inteceptor2 implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // TODO Auto-generated method stub
        System.out.println("second-preHandle");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        System.out.println("second-postHandle");
        
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        System.out.println("second-afterCompletion");
        
    }

}

请求的方法：

@Controller
public class BController {
    @RequestMapping(value="/test")
    public void test(){
//        
        System.out.println("目标方法执行");
        
        
    }
}

执行的结果：

first-preHandle
second-preHandle
目标方法执行
second-postHandle
first-postHandle
second-afterCompletion
first-afterCompletion

结果说明多拦截器的顺序是：

 先执行第一拦截器的preHandle

然后第二个拦截器的preHandle

目标方法的方法

第二个拦截器的postHandle

第一个拦截器的postHandle

第二个拦截器的afterCompletion

第一个拦截器的afterCompletion