连接MYSQL数据库的问题。

billy_sq 2007-05-11 02:23:50

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;

public class NetClient {

private static int Port = 8088;
private String url="jdbc:mysql://localhost:3306/meal";
private String username="root";
private String password="111";
private Connection conn=null;
private Statement statement=null;
private ResultSet result=null;

public NetClient()
{

ConnectData();
System.out.prinln("connect success");

}
public void ConnectData()
{
try { //下面这行就出错了。
Class.forName( "com.mysql.jdbc.Driver" );
conn = DriverManager.getConnection(
url,username,password );

} catch (ClassNotFoundException e) {
// TODO 自动生成 catch 块
System.err.println(
"装载 JDBC/ODBC 驱动程序失败。" );
e.printStackTrace();
System.exit( 1 );
} catch (SQLException e) {
// TODO 自动生成 catch 块
System.err.println( "无法连接数据库" );
e.printStackTrace();
System.exit( 1 );
}
}
public static void main(String args[])
{
new NetClient();
}
}
报错：========================================================

装载 JDBC/ODBC 驱动程序失败。
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at NetClient.ConnectData(NetClient.java:55)
at NetClient.<init>(NetClient.java:43)
at NetClient.main(NetClient.java:219)

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