📄 loginservlet2.java
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package org.sunxin.lesson.jsp.ch09;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
public class LoginServlet2 extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,IOException
{
String action=req.getParameter("action");
if("chk".equals(action))
{
String name=req.getParameter("user");
String pwd=req.getParameter("password");
if((name!=null) && (pwd!=null))
{
if(name.equals("zhangsan") && pwd.equals("1234"))
{
StringBuffer sb=new StringBuffer();
sb.append("username=");
sb.append(name);
sb.append("&password=");
sb.append(pwd);
Cookie cookie=new Cookie("userinfo",sb.toString());
cookie.setMaxAge(1800);
resp.addCookie(cookie);
resp.sendRedirect("greet2");
return;
}
else
{
resp.setContentType("text/html;charset=gb2312");
PrintWriter out=resp.getWriter();
out.println("用户名或密码错误，请<a href=login2>重新登录</a>");
return;
}
}
}
else
{
resp.setContentType("text/html;charset=gb2312");
PrintWriter out=resp.getWriter();
out.println("<html>");
out.println("<meta http-equiv=\"Pragma\" content=\"no-cache\">");
out.println("<head><title>登录页面</title></head>");
out.println("<body>");
out.println("<p>");
out.println("<form method=post action=login2?action=chk>");
out.println("<table>");
out.println("<tr>");
out.println("<td>请输入用户名</td>");
out.println("<td><input type=text name=user></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>请输入密码</td>");
out.println("<td><input type=password name=password></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td><input type=reset value=重填></td>");
out.println("<td><input type=submit value=登录></td>");
out.println("</tr>");
out.println("</table></form></body></html>");
out.close();
}
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,IOException
{
doGet(req,resp);
}
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