securityfilter.java

来自「本项目源码是一个真实的应用项目」· Java 代码 · 共 39 行

package org.langsin.computer.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;

public class SecurityFilter implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
	HttpServletRequest req=(HttpServletRequest)request;
	HttpServletResponse res=(HttpServletResponse)response;
	if(req.getSession().getAttribute("user")==null){
		res.sendRedirect(req.getContextPath()+"/index.jsp");
		
	}
	chain.doFilter(request, response);

	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}