<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>admin.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<font size="44">欢迎管理员光临</font>
</body>
</html>
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;
//对敏感目录进行认证
public class FilterDemo6 implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest req, ServletResponse res,FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
//取得用户请求参数
String username = request.getParameter("username");
String password = request.getParameter("password");
//判段
if(username!=null && password!=null){
if(username.equals("admin") && password.equals("123")){
//允许进入敏感资源
chain.doFilter(request,response);
}else{
//转发到message.jsp页面
request.setAttribute("message","用户名或密码不正确");
request.getRequestDispatcher("/message.jsp").forward(request,response);
}
}else{
//转发到message.jsp页面
request.setAttribute("message","必须填入用户名和密码");
request.getRequestDispatcher("/message.jsp").forward(request,response);
}
}
public void destroy() {
}
}
web.xml
<filter>
<filter-name>FilterDemo6</filter-name>
<filter-class>cn.web.filter.FilterDemo6</filter-class>
</filter>
<filter-mapping>
<filter-name>FilterDemo6</filter-name>
<url-pattern>/admin/*</url-pattern>
</filter-mapping>message.jsp
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ page isELIgnored="false" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
${message}
</body>
</html>
原文地址：http://blog.51cto.com/357712148/2105123
