g(null, "用户名或密码不能为空！！");
}
}

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

}
package com.csdn.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

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

import com.csdn.bean.User;
import com.csdn.service.UserService;
import com.csdn.service.UserServiceImp;

public class QueryIdServlet extends HttpServlet {
UserService userService = new UserServiceImp();

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = response.getWriter();
Integer id = Integer.valueOf(request.getParameter("id"));
User user = userService.queryById(id);
response.getWriter().write("

查询内容是：

");
pw.write("id:" + user.getId() + "
");
pw.write("用户名：" + user.getUsername() + "
");
pw.write("密码：" + user.getPassword() + "
");
pw.write("登录时间：" + user.getLogintime());
}

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

}
package com.csdn.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.JOptionPane;

import com.csdn.bean.User;
import com.csdn.service.UserService;
import com.csdn.service.UserServiceImp;

public class QueryServlet extends HttpServlet {
UserService userService = new UserServiceImp();

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = response.getWriter();
// 与数据库比较，判断用户是否存在
List list = userService.queryAll();
pw.write("

查询内容是：

");
for (User user : list) {
pw.write("id:" + user.getId() + "
");
pw.write("用户名：" + user.getUsername() + "
");
pw.write("密码：" + user.getPassword() + "
");
pw.write("登录时间：" + user.getLogintime() + "
");
response.getWriter().write("

下一个用户是：

");
}
}

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

}
package com.csdn.servlet;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

import com.csdn.bean.User;
import com.csdn.service.UserService;
import com.csdn.service.UserServiceImp;

public class UpdateServlet extends HttpServlet {
UserService userService = new UserServiceImp();

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

update(request, response);
}

public void update(HttpServletRequest request,

MVC设计模式编写的一个login小项目(六)

查询内容是：

查询内容是：

下一个用户是：