浅谈springMVC拦截器和过滤器总结

拦截器： 用来对访问的url进行拦截处理

用处： 权限验证，乱码设置等

spring-mvc.xml文件中的配置：

对所有的url进行拦截

java代码

package com.hbut.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 TestInterceptor implements HandlerInterceptor {

  @Override
  public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
    
   //todo 在此处添加要操作code 
   System.out.println("preHandle"); 
    return true; //todo 此处为false时，请求不会到达control层
  }

  @Override
  public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    System.out.println("postHandle"); //todo 可以用来修改信息，跳转等
  }

  @Override
  public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
    System.out.println("afterCompletion"); //todo 最后执行
  }
}

另一种拦截器：大同小异

package com.hbut.interceptor;

import org.springframework.ui.ModelMap;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.context.request.WebRequestInterceptor;


public class Test2Interceptor implements WebRequestInterceptor {
  @Override
  public void preHandle(WebRequest webRequest) throws Exception {
  }

  @Override
  public void postHandle(WebRequest webRequest, ModelMap modelMap) throws Exception {

  }

  @Override
  public void afterCompletion(WebRequest webRequest, Exception e) throws Exception {

  }
}

过滤器： 依赖于servlet容器，使用回调函数，过滤范围大

拦截器： 依赖于框架容器 比如spring、mybatis ，灵活

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。