第十三周作业
package dao;
import java.sql.*;
public class BaseDao {
//获取连接
protected Connection getConnection(){
Connection conn=null;
try {
Class.forName("com.mysql.jdbc.Driver");
// 2.建立连接
conn = DriverManager.getConnection(
"jdbc:mysql://localhost/mysqldb?useSSL=true&useUnicode=true&characterEncoding=utf8", "root", "root");
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
//关闭连接
protected void closeAll(Connection con, PreparedStatement ps, ResultSet rs){
try {
if(rs != null)
rs.close();
if(ps != null)
ps.close();
if(con != null)
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
package dao;
import util.DBUtil;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDao extends BaseDao{
public boolean login(String name,String pwd){
boolean f=false;
Connection conn= DBUtil.getCon();
String sql="select * from users where uname=? and upwd=?";
PreparedStatement ps;
try {
ps = conn.prepareStatement(sql);
ps.setString(1, name);
ps.setString(2, pwd);
ResultSet rs=ps.executeQuery();
if(rs.next())
f=true;
closeAll(conn, ps, rs);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return f;
}
public int reg(String uname, String upwd) {
Connection conn = getConnection();
int i=0;
PreparedStatement ps = null;
try {
String sql = "insert into users(uname,upwd) values(?,?)";
ps = conn.prepareStatement(sql);
ps.setString(1, uname);
ps.setString(2, upwd);
i=ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, null);
}
return i;
}
}
package dao;
import pojo.Msg;
import util.DBUtil;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class MsgDao extends BaseDao{
public List<Msg> getMailByReceiver(String name) {
List<Msg> list = new ArrayList<Msg>();
Connection conn = getConnection();
String sql = "select * from mail where addressee=?";
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
ps.setString(1, name);
rs = ps.executeQuery();
while (rs.next()) {
Msg m = new Msg();
int eid = rs.getInt("eid");
String sender = rs.getString("sender");
String addressee = rs.getString("addressee");
String title = rs.getString("title");
String content = rs.getString("content");
Date sending_time = rs.getDate("sending_time");
int state = rs.getInt("state");
m.setEid(eid);
m.setSender(sender);
m.setAddressee(addressee);
m.setTitle(title);
m.setContent(content);
m.setSending_time(sending_time);
m.setState(state);
list.add(m);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, rs);
}
return list;
}
public void addMsg(Msg m) {
Connection conn = getConnection();
String sql = "insert into mail(sender,addressee,title,content,sending_time,state) values(?,?,?,?,?,?)";
PreparedStatement ps = null;
try {
ps = conn.prepareStatement(sql);
ps.setString(1, m.getSender());
ps.setString(2, m.getAddressee());
ps.setString(3, m.getTitle());
ps.setString(4, m.getContent());
ps.setDate(5, new java.sql.Date(new Date().getTime()));
ps.setInt(6, m.getState());
ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, null);
}
}
public void delMail(int id) {
Connection conn = getConnection();
String sql = "delete from mail where eid=?";
PreparedStatement ps = null;
try {
ps = conn.prepareStatement(sql);
ps.setInt(1, id);
ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, null);
}
}
public Msg getMailById(int id) {
Connection conn = getConnection();
String sql = "select * from mail where eid=?";
PreparedStatement ps = null;
ResultSet rs = null;
Msg m = null;
try {
ps = conn.prepareStatement(sql);
ps.setInt(1, id);
rs = ps.executeQuery();
while (rs.next()) {
m = new Msg();
int eid = rs.getInt("eid");
String sender = rs.getString("sender");
String addressee = rs.getString("addressee");
String title = rs.getString("title");
String content = rs.getString("content");
Date sending_time = rs.getDate("sending_time");
m.setEid(eid);
m.setSender(sender);
m.setAddressee(addressee);
m.setTitle(title);
m.setContent(content);
m.setSending_time(sending_time);
m.setState(readMail(id) == 1 ? 0 : 1);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, rs);
}
return m;
}
public int readMail(int id) {
int n = 0;
Connection conn = getConnection();
String sql = "update mail set state='0' where eid=?";
PreparedStatement ps = null;
try {
ps = conn.prepareStatement(sql);
ps.setInt(1, id);
n = ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, null);
}
return n;
}
}
package service; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import dao.UserDao; /** * Servlet implementation class doreg */ @WebServlet("/doreg") public class doreg extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public doreg() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String uname = request.getParameter("uname"); String upwd = request.getParameter("upwd"); UserDao ud=new UserDao(); ud.reg(uname, upwd); request.getRequestDispatcher("login.jsp").forward(request, response); } }
package service;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.UserDao;
/**
* Servlet implementation class dologin
*/
@WebServlet("/dologin")
public class dologin extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public dologin() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String uname = request.getParameter("uname");
String upwd = request.getParameter("upwd");
UserDao ud=new UserDao();
if(ud.login(uname, upwd)){
request.getSession().setAttribute("uname", uname);
request.getRequestDispatcher("main.jsp").forward(request, response);
}else{
response.getWriter().print("登陆失败，即将跳回登陆页.....");
response.setHeader("refresh", "5;url=login.jsp");
}
}
}
package service;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.MsgDao;
/**
* Servlet implementation class dodelete
*/
@WebServlet("/dodelete")
public class dodelete extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public dodelete() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
int id=Integer.parseInt(request.getParameter("id"));
MsgDao md=new MsgDao();
md.delMail(id);
response.sendRedirect("main.jsp");
}
}
package service;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.MsgDao;
import pojo.Msg;
/**
* Servlet implementation class dowrite
*/
@WebServlet("/dowrite")
public class dowrite extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public dowrite() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
String uname=(String)request.getSession().getAttribute("uname");
String addressee=request.getParameter("addressee");
String title=request.getParameter("title");
String content=request.getParameter("content");
Msg m=new Msg();
m.setContent(content);
m.setSender(uname);
m.setAddressee(addressee);
m.setTitle(title);
MsgDao md=new MsgDao();
md.addMsg(m);
response.getWriter().print("发送成功.....");
response.setHeader("refresh", "5;url=main.jsp");
}
}
posted on 2022-05-29 13:59 chenyulin11 阅读(8) 评论(0) 编辑 收藏 举报
