怎么样保存用户登陆的用户名和密码，下次登录时自动填充用户名和密码

wuchao911 2008-01-27 05:10:33

怎么样才能保存用户上次登陆的用户名和密码，下次，在登陆时可以不用输入用户名和密码就能登陆系统。

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manlibie 2008-01-29

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1 用户名和密码加密后，保存到cookie里面，
2 用户访问时，cookie会自动发到服务器
3 服务器端拿到cookie后，解密，判断是否正确，如果没问题，按登陆成功处理

老紫竹 2008-01-28

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mdzlkj 2008-01-28

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一注册表
二文件流

无尽涟漪 2008-01-28

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一楼的就是我一般的做法

xiaoben008 2008-01-28

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用COOKIE技术

friendforever 2008-01-28

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下面是登陆servlet

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

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

public class CookieServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
String username = "";
String pwd = "";
Cookie[] c = request.getCookies();
if(c != null){
for(int i = 0;i<c.length;i++){
if(c[i].getName().equals("user")){
username = c[i].getValue();
}
if(c[i].getName().equals("pwd")){
pwd = c[i].getValue();
}
}
}

PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">");
out.println("<title>登录</title>");
out.println("</head>");
out.println("<body><center><form action=\"./ValidateServlet\" method=\"post\" name=\"login\">");
out.println();
out.println("用户名：<input type=\"text\" size=\"20\" name=\"userName\" value="+ username +">");
out.println("<BR>");
out.println("</p><p>密码：<input type=\"password\" size=\"20\" name=\"pwd\" value=" + pwd +">");
out.println("<BR>");
out.println("<input type=\"Submit\" name=\"button1\" value=\"提交\">");

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request, response);
}

}

下面处理登陆的servlet
import java.io.IOException;
import java.io.PrintWriter;

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

public class ValidateServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
String username = request.getParameter("userName");
String pwd = request.getParameter("pwd");
//验证用户名，密码是否正确，此处略；如果正确则进行一下操作
Cookie user = new Cookie("user",username);
Cookie password = new Cookie("pwd",pwd);
user.setMaxAge(24*60*60);
password.setMaxAge(24*60*60);
response.addCookie(user);
response.addCookie(password);
response.getWriter().println("成功");

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request, response);
}

}
访问CookieServlet即可.注意ValidateServlet 中没有连接数据库验证.

wuchao911 2008-01-28