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filter实现登录验证，并且过滤servlet

2010-07-06 17:04 447 查看

登录html：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>Login</title>
</head>
<body>
    Login<br>

    <form action="servlet/Login" method="post">
     UserName:<input type="text" name="username"/><br/>
     Password:<input type="text" name="password"/><br/>
     <input type="submit" value="Login"/>
    </form>
</body>
</html>

登录servlet判定类，就是中间简单的充当业务逻辑的判定类

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import org.apache.log4j.Logger;
/**
*
* @author zwc
*
*/
@SuppressWarnings("serial")
public class Login extends HttpServlet {
private Logger logger = Logger.getLogger(this.getClass());
public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException{
  doPost(request,response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  response.setContentType("text/html;charset=UTF-8");
  response.setCharacterEncoding("UTF-8");
  request.setCharacterEncoding("UTF-8");
  PrintWriter out = response.getWriter();
  String username = request.getParameter("username");
  String password = request.getParameter("password");
  HttpSession session = request.getSession();

  if("zhangwc".equals(username) && "123456".equals(password)){  注意：逻辑判定，就这一句
   session.setAttribute("isLogin", true);
   logger.info("登录成功");
  }else{
   session.setAttribute("isLogin", false);
   logger.info("登录失败");
  }
  //RequestDispatcher rd = request.getRequestDispatcher("/error.jsp");
  //rd.forward(request, response);
}
}

过滤类，需要实现filter接口

package filter;

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;

import org.apache.log4j.Logger;

/**
*
* @author zwc
*
*/

public class LoginFilter implements Filter {
private Logger logger = Logger.getLogger(this.getClass());
private String excludeDirs[];
private boolean isExclude = false;
private String contextPath;
public void doFilter(ServletRequest servletrequest,
   ServletResponse servletresponse, FilterChain filterchain)
   throws IOException, ServletException {
  HttpServletRequest request = (HttpServletRequest) servletrequest;
  HttpServletResponse response = (HttpServletResponse) servletresponse;
  HttpSession session = request.getSession(true);

  String path = request.getServletPath(); 得到当前请求的路径
  int start = path.indexOf("*");

  for(String requestPath : excludeDirs){
   if(requestPath.indexOf(path) != -1){ 如果该路径在文档中存在，或者包括，则跳过，
    logger.info("请求路径为：" + path +" .......放过");
    filterchain.doFilter(servletrequest, servletresponse);  注意这里要加，过滤链，否则对应的servlet不会指向
   }else{
    logger.info("请求路径为：" + path +" .......不放过，过滤");
    Object o = session.getAttribute("isLogin");session判定
    logger.info("请求经过过滤器，isLogin：" + o);
    if(o != null && ((Boolean)o == Boolean.TRUE)){
     filterchain.doFilter(servletrequest, servletresponse);
    }else{
//     RequestDispatcher rd = request.getRequestDispatcher("/login.jsp");
     response.sendRedirect(contextPath + "/login.jsp");
    }
   }
  }
}
public void init(FilterConfig filterconfig) throws ServletException {
  excludeDirs = filterconfig.getInitParameter("exclude").split(";");

得到初始化时，定义的，过滤白名单中，不用过滤的目录和文件，不支持   “ * ”
  contextPath = filterconfig.getServletContext().getContextPath();

得到文档的上下文路径
}
public void destroy() {
}
}

web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<context-param>
  <param-name>username</param-name>
  <param-value>yuanfen</param-value>
</context-param>




<jsp-config>
  <taglib>
   <taglib-uri>/test-1.0</taglib-uri>
   <taglib-location>test-1.0.tld</taglib-location>
  </taglib>
</jsp-config>


<session-config>
  <session-timeout>-1</session-timeout>
</session-config>




<filter>
  <description>支持，文件和路径。不支持    * 处理</description>
  <filter-name>LoginFilter</filter-name>
  <filter-class>filter.LoginFilter</filter-class>
  <init-param>
   <param-name>exclude</param-name>
   <param-value>/servlet/Login;</param-value>
  </init-param>
</filter>
<filter-mapping>
  <filter-name>LoginFilter</filter-name>
  <url-pattern>/servlet/*</url-pattern>
</filter-mapping>


<servlet>
    <servlet-name>Login</servlet-name>
    <servlet-class>servlet.Login</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>Login</servlet-name>
    <url-pattern>/servlet/Login</url-pattern>
</servlet-mapping>

<error-page>
  <exception-type>java.lang.Exception</exception-type>
  <location>/error.jsp</location>
</error-page>
<error-page>
  <error-code>500</error-code>
  <location>/error.jsp</location>
</error-page>
<welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

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标签： filter servlet string session path html

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