📄 loginservlet.java
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package org.sunxin.lesson.jsp.ch09;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
public class LoginServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,IOException
{
resp.setContentType("text/html;charset=gb2312");
HttpSession session=req.getSession();
String user=(String)session.getAttribute("user");
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>");
OutputSessionInfo.printSessionInfo(out,session);
out.println("<p>");
out.println("<form method=post action="+resp.encodeURL("loginchk")+">");
out.println("<table>");
out.println("<tr>");
out.println("<td>请输入用户名</td>");
if(null==user)
{
out.println("<td><input type=text name=user></td>");
}
else
{
out.println("<td><input type=text name=user value="+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>");
out.println("</form>");
out.println("</body>");
out.println("</html>");
out.close();
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,IOException
{
doGet(req,resp);
}
}⌨️ 快捷键说明
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