java SpringMVC Filter 登录拦截器

<filter-mapping>

<filter-name>SecurityServlet</filter-name>

<url-pattern>*.jsp</url-pattern>

</filter-mapping>

<filter-mapping>

<filter-name>SecurityServlet</filter-name>

<url-pattern>*.do</url-pattern>

</filter-mapping>

这里我们用的是.do 拦截格式，就是说所有请求中有.do 的请求都会被我们拦截下来做登录处理，这里如果将.do 写成“/”的话，就会拦截所有请求，会导致 js 文件、css 文件等文件无法访问

这里我们写 《一线大厂 Java 面试题解析+后端开发学习笔记+最新架构讲解视频+实战项目源码讲义》无偿开源 威信搜索公众号【编程进阶路】 的是继承 HttpServlet 类实现 Filter 接口

package org.andy.shop.utils;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

/**

• Filter 登录拦截器

• @author lyy

• @date 2016-05-05

*/

public class SecurityServlet extends HttpServlet implements Filter{

/**

*/

private static final long serialVersionUID = 1L;

public void init(FilterConfig filterConfig) throws ServletException {

}

public void doFilter(ServletRequest srequest, ServletResponse sresponse, FilterChain chain)

throws IOException, ServletException {

HttpServletRequest request=(HttpServletRequest)srequest;

HttpServletResponse response =(HttpServletResponse) sresponse;

HttpSession session = request.getSession(true);

String usercode = (String) request.getRemoteUser();// 登录人