来个高手问个问题，Servlt 的。别说用过滤器..没学呢- -。

package com.jj;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;public class LongifServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=gb2312");
response.setCharacterEncoding("gb2312");
PrintWriter out = response.getWriter();
out.println("<form action='/Servlet1/servlet/MainServlet' method='post'/></br>");
out.println("帐号：<input type='text' name='username'/></br>");
out.println("密码：<input type='password' name='password'/></br>");
out.println("性别：<input type='radio' name='sex' value='男'/>男<input type='radio' name='sex' value='女'/>女");
out.println("<input type='submit' value='提交'/>");

} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
PrintWriter out = response.getWriter();
doGet(request,response);
}}
package com.jj;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;public class MainServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html;charset=gb2312");
response.setCharacterEncoding("gb2312");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String password = request.getParameter("password");
String sex = request.getParameter("sex");
out.println("姓名="+username + "</br>");
out.println("密码="+password+ "</br>");
out.println("性别="+ sex);


} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
PrintWriter out = response.getWriter();
this.doGet(request, response);
}}