20151210--MVC
package com.hanqi; import java.io.IOException;
import java.sql.*;
import java.text.SimpleDateFormat; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.omg.PortableInterceptor.RequestInfoOperations; import com.hanqi.*;
import com.hanqi.dao.User;
import com.hanqi.dao.UserDal; import java.util.*;
import java.util.Date;
/**
* Servlet implementation class SaveUser
*/
public class SaveUser extends HttpServlet {
private static final long serialVersionUID = 1L;
private User user; /**
* @see HttpServlet#HttpServlet()
*/
public SaveUser() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //转码，固定写法
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8"); Date dt = new Date();//获取当前时间
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//格式化时间
String sj = sdf.format(dt);//将时间转换为字符串格式 //获取内容
String userID = request.getParameter("userid");
String userName = request.getParameter("username");
String pw = request.getParameter("password");
//判断输入的内容
if(userID == null || userID.trim().length() == 0)
{
//输出内容
response.getWriter().append("用户代码不能为空");
}
else if(userName == null || userName.trim().length() == 0)
{
response.getWriter().append("用户姓名不能为空");
}
else
{ User user = new User(); user.setUserid(userID);
user.setUsername(userName);
user.setPassword(pw);
user.setuserTime(sj); //调用模型层 UserDal ud = new UserDal(); try { ud.insert(user); response.sendRedirect("FindUserList"); } catch (Exception e) { response.getWriter().append("保存数据失败"); e.printStackTrace();
}
}
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
} }
增加
package com.hanqi; import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.hanqi.common.DBHelper; import java.sql.*;
import java.util.Date;
import com.hanqi.dao.*; /**
* Servlet implementation class DeleteUser
*/
public class DeleteUser extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public DeleteUser() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //转码
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8"); String userid = request.getParameter("userid");
if(userid != null && userid.trim().length() > 0)
{
UserDal ud = new UserDal(); try { ud.delete(userid); response.sendRedirect("FindUserList"); } catch (Exception e) { response.getWriter().append("删除数据失败"); e.printStackTrace();
}
}
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
} }
删除
package com.hanqi; import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.hanqi.common.DBHelper;
import com.hanqi.dao.User;
import com.hanqi.dao.UserDal; /**
* Servlet implementation class EditUser
*/
public class EditUser extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public EditUser() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8"); //接受相关参数
String userID = request.getParameter("userid");
String userName = request.getParameter("username");
String pw = request.getParameter("password");
//判断输入的内容
if(userID == null || userID.trim().length() == 0)
{
//输出内容
response.getWriter().append("用户代码不能为空");
}
else if(userName == null || userName.trim().length() == 0)
{
response.getWriter().append("用户姓名不能为空");
}
else
{
User user = new User(); user.setUserid(userID);
user.setUsername(userName);
user.setPassword(pw); UserDal ud = new UserDal(); try
{ ud.update(user); response.sendRedirect("FindUserList"); }
catch(Exception e)
{ response.getWriter().append("修改数据失败"); e.printStackTrace();
}
} } /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
} }
修改
package com.hanqi; import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.*; import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.hanqi.dao.User;
import com.hanqi.dao.UserDal; /**
* Servlet implementation class FindUserList
*/
public class FindUserList extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public FindUserList() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
UserDal ud = new UserDal();
try
{
ArrayList<User> al = ud.getListAll();
request.setAttribute("userlist", al);
}
catch(Exception e)
{
response.getWriter().append("查找数据失败");
e.printStackTrace();
} //页面跳转
request.getRequestDispatcher("ShowUserList.jsp").forward(request,response); } /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
} }
查找
package com.hanqi.dao; import java.sql.*;
import java.util.ArrayList; import com.hanqi.common.*; //关于User表的数据库操作类
public class UserDal
{ //增
public int insert(User user) throws Exception
{
int rtn = -1; Connection conn = DBHelper.getConnection(); PreparedStatement pst = null; if (conn != null)
{
try{
String sql = "insert into T_User (user_id, user_name, password,user_time) values (?,?,?,?) "; pst = conn.prepareStatement(sql); pst.setString(1, user.getUserid());
pst.setString(2, user.getUsername());
pst.setString(3, user.getPassword());
pst.setString(4, user.getuserTime());
rtn = pst.executeUpdate();
}
catch(Exception ex)
{
throw ex;
}
finally
{
try
{
pst.close();
}
catch(Exception e)
{
conn.close();
}
}
} return rtn;
} //删 public int delete(String user_id) throws Exception
{
int rtn = -1; Connection conn = DBHelper.getConnection(); PreparedStatement pst = null; if (conn != null)
{
try{
String sql = "delete T_User where user_id = ?"; pst = conn.prepareStatement(sql); pst.setString(1, user_id); rtn = pst.executeUpdate();
}
catch(Exception ex)
{
throw ex;
}
finally
{
try
{
pst.close();
}
catch(Exception e)
{
conn.close();
}
}
} return rtn;
} //改
public int update(User user) throws Exception
{
int rtn = -1; Connection conn = DBHelper.getConnection(); PreparedStatement pst = null; if (conn != null)
{
try
{
String sql = "update T_User set user_name = ?,password = ? "
+ "where user_id = ? "; pst = conn.prepareStatement(sql); pst.setString(3, user.getUserid());
pst.setString(1, user.getUsername());
pst.setString(2, user.getPassword()); rtn = pst.executeUpdate();
}
catch(Exception ex)
{
throw ex;
}
finally
{
try
{
pst.close();
}
catch(Exception e)
{
conn.close();
}
}
} return rtn;
} //查
public ArrayList<User> getListAll() throws Exception
{
ArrayList<User> rtn = new ArrayList<User>(); Connection conn = DBHelper.getConnection(); PreparedStatement pst = null; if (conn != null)
{
try
{ String sql = "select * from t_user"; pst = conn.prepareStatement(sql); ResultSet rs = pst.executeQuery();
if(rs != null)
{
while(rs.next())
{
User u = new User(); u.setUserid(rs.getString("user_id"));
u.setUsername(rs.getString("user_name"));
u.setPassword(rs.getString("password"));
u.setuserTime(rs.getString("user_time"));
rtn.add(u); //取一个数就放一个数
}
}
}
catch(Exception ex)
{
throw ex;
}
finally
{
try
{
pst.close();
}
catch(Exception e)
{
conn.close();
}
}
}
return rtn;
}
}
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