从JSP连接MySQL

New*_*ser 6 mysql jsp database-connection

我刚刚踏上JSP.我开始编写简单的程序来显示日期,系统信息.然后我尝试连接MySQL database我有一个免费托管帐户,但我无法连接到MySQL数据库.这是我的代码:

<%@ page import="java.sql.*" %> 
<%@ page import="java.io.*" %> 
<html> 
<head> 
<title>Connection with mysql database</title>
</head> 
<body>
<h1>Connection status</h1>
<% 
try {
    String connectionURL = "jdbc:mysql://mysql2.000webhost.com/a3932573_product";
    Connection connection = null; 
    Class.forName("com.mysql.jdbc.Driver").newInstance(); 
    connection = DriverManager.getConnection(connectionURL, "a3932573_dibya", "******");
    if(!connection.isClosed())
         out.println("Successfully connected to " + "MySQL server using TCP/IP...");
    connection.close();
}catch(Exception ex){
    out.println("Unable to connect to database.");
}
%>
</font>
</body> 
</html>
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我收到消息,因为连接状态无法连接到数据库.我PHP使用相同的用户名,密码和数据库名称测试了此连接.我哪里弄错了?

gks*_*gks 8

原因是驱动程序尚未加载到库中,它没有在连接中实例化,因此连接失败:

try {
            String connectionURL = "jdbc:mysql://host/db";
            Connection connection = null; 
            Class.forName("com.mysql.jdbc.Driver").newInstance(); 
            connection = DriverManager.getConnection(connectionURL, "username", "password");
            if(!connection.isClosed())
                 out.println("Successfully connected to " + "MySQL server using TCP/IP...");
            connection.close();
        }catch(Exception ex){
            out.println("Unable to connect to database"+ex);
        }   
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下载驱动程序


tar*_*ole 5

我有同样的问题.我非常清楚你的程序有什么问题:你没有将.jar添加到web lib.复制并粘贴到WEB-INF/lib中.

很抱歉没有使用正确的格式发布答案(我是新来的,这是我的第一个anwser :()