标签：ps 12 String rs jsp sql import null
package com.gd.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
public class BaseDao {
//获取连接
protected Connection getConnection(){
Connection conn=null;
try {
Class.forName("com.mysql.jdbc.Driver");
// 建立连接
conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root", "123456");
} 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 com.gd.dao;
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;
import com.gd.entity.Msg;
public class MsgDao extends BaseDao{
public void addMsg(Msg m){
Connection conn=getConnection();
String sql="insert into msg(username,title,msgcontent,state,sendto,msg_create_date) values(?,?,?,1,?,?)";
PreparedStatement ps=null;
try {
ps=conn.prepareStatement(sql);
ps.setString(1, m.getUsername());
ps.setString(2, m.getTitle());
ps.setString(3, m.getMsgcontent());
ps.setString(4, m.getSendto());
ps.setDate(5, new java.sql.Date(new Date().getTime()));
ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
closeAll(conn, ps, null);
}
}
public static void main(String[] args) {
MsgDao md=new MsgDao();
md.delMsg(4);
}
public void delMsg(int id) {
Connection con = getConnection();
String sql = "delete from msg where msgid=" + id;
PreparedStatement ps = null;
try {
ps = con.prepareStatement(sql);
ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(con, ps, null);
}
}
public Msg chakan(int msgid) {
Msg m = null;
Connection con = getConnection();
ResultSet rs = null;
PreparedStatement ps = null;
String sql = "select * from msg where msgid=?";
try {
ps = con.prepareStatement(sql);
ps.setInt(1, msgid);
rs = ps.executeQuery();
while (rs.next()) {
m = new Msg();
m.setMsgid(rs.getInt("msgid"));
m.setUsername(rs.getString("username"));
m.setTitle(rs.getString("title"));
m.setMsgcontent(rs.getString("msgcontent"));
m.setState(rs.getInt("state"));
m.setSendto(rs.getString("sendto"));
m.setMsg_create_date(rs.getDate("msg_create_date"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(con, ps, rs);
}
return m;
}
public int xiugai(int msgid) {
int t = -1;
Connection con = getConnection();
PreparedStatement ps = null;
String sql = "update msg set state=1 where msgid=?";
try {
ps = con.prepareStatement(sql);
ps.setInt(1, msgid);
t = ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(con, ps, null);
}
return t;
}
//根据收件人查看全部邮件
public List<Msg> getMailByReceiver(String name){
List<Msg> list=new ArrayList<Msg>();
Connection con=getConnection();
String sql="select * from msg where sendto=?";
PreparedStatement ps=null;
ResultSet rs=null;
try {
ps = con.prepareStatement(sql);
ps.setString(1, name);
rs=ps.executeQuery();
while(rs.next()){
//每读取一行，创建一个msg对象，对象放到集合中
Msg m=new Msg();
m.setMsgid(rs.getInt(1));
m.setUsername(rs.getString(2));
m.setTitle(rs.getString(3));
m.setMsgcontent(rs.getString(4));
m.setState(rs.getInt(5));
m.setSendto(rs.getString(6));
m.setMsg_create_date(rs.getDate(7));
list.add(m);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
closeAll(con, ps, rs);
}
return list;
}
}
package com.gd.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.gd.entity.Users;
public class UsersDao extends BaseDao{
//关于用户的增删改查，用到什么功能鞋什么
//登陆
public boolean login(String name,String pwd){
boolean f=false;
Connection conn=getConnection();
String sql="select * from users where uname=? and upwd=?";
PreparedStatement ps=null;
ResultSet rs=null;
try {
ps = conn.prepareStatement(sql);
ps.setString(1, name);//第一个？赋值为name
ps.setString(2, pwd);
rs=ps.executeQuery();
if(rs.next())//查到结果了
f=true;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
closeAll(conn, ps, rs);
}
return f;
}
//注册
public int Register(String name,String pwd){
int i=-1;
PreparedStatement pred=null;
Connection con=getConnection();
String sql="insert into users(uname,password)values(?,?)";
try {
pred= con.prepareStatement(sql);
pred.setString(1, name);
pred.setString(2, pwd);
i=pred.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeAll(con, pred, null);
}
return i;
}
}
<%@page import="com.gd.entity.Msg"%>
<%@page import="com.gd.dao.MsgDao"%>
<%@page import="com.gd.dao.UsersDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
int id=Integer.parseInt(request.getParameter("id"));
MsgDao md=new MsgDao();
md.delMsg(id);
response.sendRedirect("main.jsp");
%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<script type="text/javascript">
function validate(){
if(loginForm.uname.value==""){
alert("账号不能为空!");
return;
}
if(loginForm.upwd.value==""){
alert("密码不能为空!");
return;
}
loginForm.submit();
}
</script>
<form name="loginForm" action="dologin.jsp" method="post">
用户名:<input type="text" name="uname" value="zs"><br>
密码: <input type="password" name="upwd" value="zs">
<input type="button" value="登录" onClick="validate()">
</form>
<a href="reg.jsp">立即注册</a>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<script type="text/javascript">
function validate(){
if(loginForm.uname.value==""){
alert("账号不能为空!");
return;
}
if(loginForm.upwd.value==""){
alert("密码不能为空!");
return;
}
loginForm.submit();
}
</script>
<form name="loginForm" action="dologin.jsp" method="post">
用户名:<input type="text" name="uname" value="zs"><br>
密码: <input type="password" name="upwd" value="zs">
<input type="button" value="登录" onClick="validate()">
</form>
<a href="reg.jsp">立即注册</a>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<script type="text/javascript">
function validate(){
if(loginForm.uname.value==""){
alert("账号不能为空!");
return;
}
if(loginForm.upwd.value==""){
alert("密码不能为空!");
return;
}
loginForm.submit();
}
</script>
<form name="loginForm" action="dologin.jsp" method="post">
用户名:<input type="text" name="uname" value="zs"><br>
密码: <input type="password" name="upwd" value="zs">
<input type="button" value="登录" onClick="validate()">
</form>
<a href="reg.jsp">立即注册</a>
</body>
</html>
<%@page import="com.gd.entity.Msg"%>
<%@page import="com.gd.dao.MsgDao"%>
<%@page import="com.gd.dao.UsersDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
String uname=(String)session.getAttribute("uname");// 发件人在session中获取
String sendto=request.getParameter("sendto");
String title=request.getParameter("title");
String content=request.getParameter("content");
Msg m=new Msg();
m.setTitle(title);
m.setMsgcontent(content);
m.setUsername(uname);
m.setSendto(sendto);
MsgDao md=new MsgDao();
md.addMsg(m);
out.print("发送成功，即将跳回首页.....");
response.setHeader("refresh", "3;url=main.jsp");
%>
<%@page import="com.gd.entity.Msg"%>
<%@page import="com.gd.dao.MsgDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
</head>
<body>
<%
MsgDao md=new MsgDao();
String uname=(String)session.getAttribute("uname");
List<Msg> list=md.getMailByReceiver(uname);
%>
欢迎你<%=uname %> <a href="write.jsp">写邮件</a>
<table border="1px">
<tr>
<td>发件人</td><td>主题</td><td>状态</td><td>时间</td>
<td>操作</td><td>操作</td>
</tr>
<%
for(int i=0;i<list.size();i++){
%>
<tr>
<td><%=list.get(i).getUsername() %></td>
<td><a href="detail.jsp?id=<%=list.get(i).getMsgid()%>"><%=list.get(i).getSendto()%></a> </td> </td>
<td><%if(list.get(i).getState()==1){ %>
<img src="images/sms_unReaded.png"/>
<%}else{ %>
<img src="images/sms_readed.png"/>
<%} %>
</td>
<td><%=list.get(i).getMsg_create_date() %></td>
<td><a href="write.jsp?reply=<%=list.get(i).getUsername()%>">回复</a></td>
<td><a href="del.jsp?id=<%=list.get(i).getMsgid()%>">删除</a></td>
</tr>
<%} %>
</table>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<html>
<base href="<%=basePath%>">
<body>
<h1>注册</h1>
<script>
function yz() {
if (form.uname.value == "") {
alert('用户名不能为空');
return;
}
if (form.password.value == "") {
alert('密码不能为空');
return;
}
form.submit();
}
</script>
<form action="doregister.jsp" method="post" name="form">
<table>
<tr>
<td>用户名</td>
<td><input type="text" name="uname">
</td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password">
</td>
</tr>
<tr>
<td><input type="button" value="注册" onclick="yz()">
</td>
<td><a href="denglu.jsp">登录</a>
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<form action="dowrite.jsp" method="post">
收件人:<input type="text" name="sendto" value="<%=request.getParameter("reply") %>"><br>
主题: <input type="text" name="title" ><br>
内容 <textarea rows="6" cols="20" name="content"></textarea>
<br>
<input type="submit" value="发送">
</form>
</body>
</html>
标签：ps,12,String,rs,jsp,sql,import,null 来源： https://www.cnblogs.com/745091528lsy/p/16297613.html
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