springmvc拦截器

最新推荐文章于 2021-08-17 19:52:49 发布

原创最新推荐文章于 2021-08-17 19:52:49 发布 · 116 阅读

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CC 4.0 BY-SA版权

本文介绍了一种基于Spring MVC的登录拦截器实现方法，该拦截器能够根据用户会话状态决定是否重定向到登录页面或主页，同时对特定路径进行放行。

package com.example.first.hello;

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

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

public class LoginInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
String uri = request.getRequestURI();
if(uri.contains(“wechat”)||uri.contains(“api”)||uri.contains(“wxuser”)){
return true;
}
User user = (User)request.getSession().getAttribute(“user”);
if(!uri.contains(“login”)){
if(user==null){
response.sendRedirect("/user/tologin");
return false;
}
}else{
if(user!=null){
response.sendRedirect("/main/index");
return false;
}
}
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
if (modelAndView != null){
if(! (modelAndView.getView() instanceof RedirectView)){
String basePath = request.getContextPath();

          request.setAttribute("basePath",basePath);
      }
  }
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println(“图片绚烂拦截”);
}
}
拦截器
package com.example.first.hello;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
public class WebAppConfig extends WebMvcConfigurerAdapter{
@Override
public void addInterceptors(InterceptorRegistry registry){
registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**");
}
}