JSP作业2017.4.5

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP ‘001.jsp‘ starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<form name="form1" method="post" action="002.jsp">
<p>&nbsp;</p>
<p>name:
<label for="textfiled"></label>
<input type="text" name="myname" id="textfiled1">
</p>
<p>class:
<label for="textfiled"></label>
<input type="text" name="myclass" id="textfiled2">
</p>
<input type="submit" name="button" id="button" value="提交">

</form>
</body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<jsp:useBean id="myjdbc01" scope="page" class="com.lty.www.DBConn" />
<%
request.setCharacterEncoding("utf-8");
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String myname=request.getParameter("myname");
String myclass=request.getParameter("myclass");

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP ‘002.jsp‘ starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<%=myname%><br>
<%=myclass%><br>
<%

String insertsql="insert into message(name,class) values(‘"+myname+"‘,‘"+myclass+"‘)";
myjdbc01.doInsert(insertsql);
myjdbc01.close();

%>

</body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="java.sql.*" %>
<%@ page import="com.mysql.jdbc.*" %>

<jsp:useBean id="myjdbc01" scope="page" class="com.lty.www.DBConn"/>
<%

request.setCharacterEncoding("utf-8");
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP ‘001.jsp‘ starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>

<%
String sql="select * from message";
ResultSet rs = myjdbc01.doSelect(sql);
out.println("<table width=‘200‘ border=‘1‘>");
out.println("<tr>");
out.println("<th scope=‘col‘>学号</th>");
out.println("<th scope=‘col‘>班级</th>");
while (rs.next()) {
out.println("<tr>");
out.println("<td>");
out.println(rs.getString(1));
out.println("</td>");
out.println("<td>");
out.println(rs.getString(2));
out.println("</td>");}
out.println("</table>");

%>

</body>
</html>

package com.lty.www;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;

public class DBConn {

private Connection conn=null;
private PreparedStatement stmt=null;
private ResultSet rs=null;

public DBConn(){

try {
String driver="com.mysql.jdbc.Driver";
String url="jdbc:mysql://localhost:3306/student";
String user="root";
String password="1234";
Class.forName(driver);
conn = (Connection) DriverManager.getConnection(url,user,password);
System.out.println("-------连接成功------");
} catch(ClassNotFoundException classnotfoundexception) {
classnotfoundexception.printStackTrace();
System.err.println("db: " + classnotfoundexception.getMessage());
} catch(SQLException sqlexception) {
System.err.println("db.getconn(): " + sqlexception.getMessage());
}

}

public DBConn(String driver,String url,String user,String password){

try {
//driver="com.mysql.jdbc.Driver";
//url="jdbc:mysql://localhost:3306/school";
//user="root";
//password="711109";
Class.forName(driver);
conn = (Connection) DriverManager.getConnection(url,user,password);
System.out.println("-------连接成功------");
} catch(ClassNotFoundException classnotfoundexception) {
classnotfoundexception.printStackTrace();
System.err.println("db: " + classnotfoundexception.getMessage());
} catch(SQLException sqlexception) {
System.err.println("db.getconn(): " + sqlexception.getMessage());
}

}

public void doInsert(String sql) {
try {
stmt = (PreparedStatement)conn.prepareStatement(sql);
int i = stmt.executeUpdate(sql);
} catch(SQLException sqlexception) {
System.err.println("db.executeInset:" + sqlexception.getMessage());
}finally{

}
}

public void doDelete(String sql) {
try {
stmt = (PreparedStatement)conn.prepareStatement(sql);
int i = stmt.executeUpdate(sql);
} catch(SQLException sqlexception) {
System.err.println("db.executeDelete:" + sqlexception.getMessage());
}
}

public void doUpdate(String sql) {
try {
stmt = (PreparedStatement)conn.prepareStatement(sql);
int i = stmt.executeUpdate(sql);
} catch(SQLException sqlexception) {
System.err.println("db.executeUpdate:" + sqlexception.getMessage());
}
}

public ResultSet doSelect(String sql) {
try {
stmt = (PreparedStatement)conn.prepareStatement(sql);
rs = stmt.executeQuery(sql);
System.out.println("取得结果集");
} catch(SQLException sqlexception) {
System.err.println("db.executeQuery: " + sqlexception.getMessage());
}
return rs;
}

public void close(ResultSet rs) throws SQLException, Exception {

if (rs != null) {
rs.close();
rs = null;
}

if (stmt != null) {
stmt.close();
stmt = null;
}

if (conn != null) {
conn.close();
conn = null;
}
}

public void close() throws SQLException, Exception {
if (stmt != null) {
stmt.close();
stmt = null;
}

if (conn != null) {
conn.close();
conn = null;
}
}

public static void main(String []args) throws Exception {
DBConn db=new DBConn();
ResultSet rs=db.doSelect("select * from dbuser where userNAME=‘chenjirong‘");
try {
while(rs.next()) {
System.out.println(rs.getString(1));
System.out.println(rs.getString(2));
System.out.println(rs.getString(3));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

rs.close();
db.close();
}
}

时间： 2024-10-23 03:10:09

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