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 Socket client;
private PrintStream os;
private DataInputStream is;
ResultSetMetaData rs;
private int orderid;
private int bussid;
private int userid;
private String mealname;
private String ip;
private String data;
private String[] order=new String[6];
private String[] user=new String[4];
private String[] bussinfo=new String[4];
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(int orderid)
{
this.orderid=orderid;
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(1);
}
}
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)
应该是mysql的jdbc驱动或是环境变量的问题。
那个jdbc的classpath环境变量应该怎么设置啊？？？
学习学习！
怎么引进啊？教一下吧，，万分感谢