基础代码随笔
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>lyb</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>interEncoding</filter-name>
<filter-class>com.luojin.entity.FilterOne</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>interEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<error-page>
<error-code>404</error-code>
<location>/error_404.jsp</location>
</error-page>
<error-page>
<error-code>500</error-code>
<location>/error_500.jsp</location>
</error-page>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.luojin.Servlet.ListServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/listServlet</url-pattern>
</servlet-mapping>
</web-app>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<script type="text/javascript">
window.onload=function(){
window.location.href="listServlet";
}
</script>
</body>
</html>
<%@page import="com.luojin.entity.Message"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%List<Message>list =(List<Message>)request.getAttribute("list"); %>
</head>
<body>
<form name="talbe1" action="delteserlvet" mothed="post" >
<h1 align="center"> 欢迎进入留言板管理系统</h1>
<table width="80%" border="0" cellpadding="4" cellspacing="1" bgcolor="#464646" class="tablestyle" align="center">
<!-- <tr align="center">
<td height="40" colspan="5" align="center" bgcolor="#EEEEEE" class="talbetitle"> 历 史 房 产 建 设 登 记 查 询 </td>
</tr> -->
<tr height="40" bgcolor="#EEEEEE" class="talbetitle" >
<td width="10%" align="center">标题</td>
<td width="20%" align="center">内容</td>
<td width="8%" align="center">作者</td>
<td width="10%" align="center">发表时间</td>
</tr>
<%for(Message land : list) {%>
<tr align="center">
<td width="10%" align="center" bgcolor="#EEEEEE"><%=land.getTitle()%></td>
<td width="6%" align="center" bgcolor="#EEEEEE" class="textstyle"><%=land.getContent()%></td>
<td width="20%" align="center" bgcolor="#EEEEEE"><%=land.getAuthor() %></td>
<td width="10%" align="center" bgcolor="#EEEEEE"><%=land.getSendTime()%></td>
</tr>
<%}%>
<tr align="center">
<td colspan="5" bgcolor="#EEEEEE" ><a href="#" onchick="return testTable()">我要留言</a></td>
</tr>
</table>
</form>
</body>
</html>
</body>
</html>
CSS
.textstyle
{
font-family:normal;
font-size:18px;
font-weight:bold;
color:orange;
text-decoration:none;
}
.tablestyle
{
font-family:normal;
font-size:18px;
font-weight:bold;
text-decoration:none;
}
.talbetitle
{
background:royalblue;
padding:5px;
text-align:left;
color:white;
font-family:normal;
text-align:center
height:20px;
font-style:normal;
font-weight:bold;
font-size:18px;
letter-spacing:2px;
padding-left:10px;
}
package com.luojin.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/**数据服务类 */
public class DBCon {
final static String SQLSERVER_DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String username="sa";
String password="123456";
String dbName="lyb";
String db_url="jdbc:sqlserver://127.0.0.1:1433; DatabaseName=" + dbName;
// 获取数据库连接对象的公共方法
public Connection getConnection()
{
Connection conn = null;
try {
Class.forName(SQLSERVER_DRIVER);
conn = DriverManager.getConnection(db_url, username, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
//关闭连接，释放资源
public void closeConn(Connection conn) {
try {
if (conn != null && !conn.isClosed()) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
//本类测试能不能拿到资源，连接对象
public static void main(String[] args)
{
DBCon oper = new DBCon ();
System.out.println(oper.getConnection().toString());
}
}
package com.luojin.dao;
import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.luojin.entity.Message;
public class MessageBo {
/**添加留言板方法*/
public boolean addMessage(Message message)
{
// boolean Addmessage=false;
DBCon dao=new DBCon();
DBCon dbOperator=new DBCon();//创建一个连接数据库的工具类
Connection conn=dbOperator.getConnection();//获取连接的数据库
String sql="insert into messageboard(title,content,sendTime,email,author) values(?,?,?,?,?)";
try {
PreparedStatement pst=conn.prepareStatement(sql);
pst.setString(1, message.getTitle());
pst.setString(2, message.getContent());
pst.setDate(3, message.getSendTime());
pst.setString(4, message.getEmail());
pst.setString(5, message.getAuthor());
if(pst.executeUpdate()>0){
return true;
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
dbOperator.closeConn(conn);
}
return false;
}
/**查询方法*/
public List<Message> queryAll()
{
List<Message> List = new ArrayList<Message>();
DBCon dbOperator = new DBCon();
Connection conn = dbOperator.getConnection();
try {
String sql = "select id,title,content,sendTime,email,author from messageboard";
PreparedStatement pst=conn.prepareStatement(sql);
ResultSet rs=pst.executeQuery();
while(rs.next()){
int id = rs.getInt("id");
String title =rs.getString("title");
String content = rs.getString("content");
Date sendTime=rs.getDate("sendTime");
String email =rs.getString("email");
String author =rs.getString("author");
Message lists=new Message(id,title,content,sendTime,email,author);
List.add(lists);
}
} catch (Exception e) {
e.printStackTrace();
}finally{
dbOperator.closeConn(conn);
}
return List ;
}
}
package com.luojin.dao;
import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.luojin.dao.DBCon;
import com.luojin.entity.User;
/**根据用户名查询*/
public class UserBo {
public User findUser(String username)
{
User user=null;
DBCon dbOperator=new DBCon();//创建一个连接数据库的工具类
Connection conn=dbOperator.getConnection();//获取连接的数据库
String sql="select password,type,email,birth,sex,telephon from users where userName=?";
try {
PreparedStatement pst=conn.prepareStatement(sql);//执行SQL语句
pst.setString(1, username);
ResultSet rs=pst.executeQuery();
if(rs.next())//遍历结果集
{
String password=rs.getString("password");
String type=rs.getString("type");
String email=rs.getString("email");
Date birth=rs.getDate("birth");
String sex=rs.getString("sex");
String telephon=rs.getString("telephon");
user=new User(password,type,email,birth,sex,telephon);
if(user!=null)
{
return user;
}
}
} catch (SQLException e) {
e.printStackTrace();
}finally
{
dbOperator.closeConn(conn);//不要忘关闭数据连接对象
}
return null;
}
/*public User findUser(String username)
{
User user=null;
DBCon dbOperator=new DBCon();//创建一个连接数据库的工具类
Connection conn=dbOperator.getConnection();//获取连接的数据库
String sql="select password,type,email,birth,sex,telephon from users where userName=?";
try {
PreparedStatement pst=conn.prepareStatement(sql);//执行SQL语句
pst.setString(1, username);//设置到preparedstatement要查找的条件
ResultSet rs=pst.executeQuery();//用ResultSet设置一个结果集
if(rs.next())//遍历结果集
{
String password=rs.getString("password");
String type=rs.getString("type");
String email=rs.getString("email");
Date birth=rs.getDate("birth");
String sex=rs.getString("sex");
String telephon=rs.getString("telephon");
user=new User(password,type,email,birth,sex,telephon);
}
} catch (SQLException e) {
e.printStackTrace();
}finally
{
dbOperator.closeConn(conn);//不要忘关闭数据连接对象
}
return user;
}*/
}
public class ListServlet extends HttpServlet {
private static final long serialVersionUID =1L;
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
MessageBo dao=new MessageBo();
List<Message> list= dao.queryAll();
req.setAttribute("list", list);
req.getRequestDispatcher("Main.jsp").forward(req, resp);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>lyb</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>interEncoding</filter-name>
<filter-class>com.luojin.entity.FilterOne</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>interEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<error-page>
<error-code>404</error-code>
<location>/error_404.jsp</location>
</error-page>
<error-page>
<error-code>500</error-code>
<location>/error_500.jsp</location>
</error-page>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.luojin.Servlet.ListServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/listServlet</url-pattern>
</servlet-mapping>
</web-app>