WEB（JSP）下的JDBC操作實驗

最後更新：2017-03-30 來源：互聯網

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標籤：driver input get exception put com man tco name

001.jsp下的代碼

<%@ 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">

</head>

<body>
<form name="form1" method="post" action="002.jsp">
<p>name=
<label for="textfield"></label>
<input type="text" name="myname" id="textfield">
</p>
<p>class=
<label for="textfield2"></label>
<input type="text" name="myclass" id="textfield2">
</p>
<p>
<input type="submit" name="button" id="button" value="提交">
</p>
</form>
</body>
</html>

002.jsp下的代碼

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<jsp:useBean id="myjdbc01" scope="page" class="com.zss.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">

</head>

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

<%
String insertsql="insert into information(name,class) values(‘"+myname+"‘,‘"+myclass+"‘)";
myjdbc01.doInsert(insertsql);
myjdbc01.close();
%>
</body>
</html>

DBConn的JavaBean代碼

package com.zss.www;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

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

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/school";
String user="root";
String password="lbx110";
Class.forName(driver);
conn = (Connection) DriverManager.getConnection(url,user,password);
System.out.println("------串連成功----");
}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.executeInsert:"+sqlexception.getMessage());
}finally{

}
}

public ResultSet doSelect(String sql) {
try {
stmt = (PreparedStatement)conn.prepareStatement(sql);
rs = stmt.executeQuery(sql);
System.out.println("取得結果集");
} 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=‘lbx‘");
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){
e.printStackTrace();
}
rs.close();
db.close();
}

}

WEB（JSP）下的JDBC操作實驗

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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