强制登陆

Posted 2020-10-08

1. web.xml 配置

 <!-- 强制用户登陆过滤 -->
  <filter>
  	<filter-name>login</filter-name>
  	<filter-class>com.yongjie.Zlxypt.util.FileLogin</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>login</filter-name>
  	<!-- 对那些文件过滤 -->
  	<url-pattern>/jsp/*</url-pattern>
  </filter-mapping>

2.代码实现:

    

package com.yongjie.Zlxypt.util;

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

public class FileLogin implements Filter{

	@Override
	public void destroy() {
		
	}
	@Override
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException {
		//转换成http
		HttpServletRequest request = (HttpServletRequest)req;
		HttpServletResponse response = (HttpServletResponse)res;
		
		//获取session 对象
		HttpSession session = request.getSession(true);
		Object obj = session.getAttribute(SystemConstant.SYSTEM_SESSION_NAME);
		
		if(obj == null){
			response.sendRedirect(request.getContextPath()+SystemConstant.SYSTEM_LOGIN_JSP);
		}else{
			chain.doFilter(request, response);
		}
	}

	@Override
	public void init(FilterConfig config) throws ServletException {
		
	}
	
}

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