JDBC连接MySQL出现的错误，希望能有人指点！

[hoc]

连接MySQL的部分语句：
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
String url ="jdbc:mysql://localhost/3306/samp_db?user=root&password=hoc&useUnicode=true&characterEncoding=8859_1";
Connection conn= DriverManager.getConnection(url);
运行后出的错误如下：
Exception in thread "main" java.sql.SQLException: Communication failure during h
andshake. Is there a server running on localhost:3306?
at org.gjt.mm.mysql.MysqlIO.init(MysqlIO.java:327)
at org.gjt.mm.mysql.Connection.connectionInit(Connection.java:261)
at org.gjt.mm.mysql.jdbc2.Connection.connectionInit(Connection.java:89)
at org.gjt.mm.mysql.Driver.connect(Driver.java:167)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:193)
at ConnMysql.main(ConnMysql.java:29)
类是ConnMysql.java,第29行是：Connection conn= DriverManager.getConnection(url);

[hoc]

我的类是下面这样的，并且Mysql4.1已经装好了，我还可以通过[MySQL Command Line Client]登陆！
import java.sql.*;
public class ConnMysql
{
public static void main(String[] abc) throws ClassNotFoundException,SQLException,
InstantiationException,IllegalAccessException
{
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
String url ="jdbc:mysql://localhost/3306/samp_db?user=root&password=root123&useUnicode=true&characterEncoding=8859_1";
Connection conn= DriverManager.getConnection(url);
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from users where name='may'";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()) {
System.out.println("this is a username--->"+rs.getString(1));
System.out.println("this is a userpass--->"+rs.getString(2));
}
rs.close();
stmt.close();
conn.close();
}}

[fxfboy]

>
>String url ="jdbc:mysql://localhost/3306/samp_db?>user=root&password=root123&useUnicode=true&characterEncoding=8859_1";
>

String url ="jdbc:mysql://localhost:3306/samp_db?user=root&password=root123&useUnicode=true&characterEncoding=8859_1";

这样呢？

[hoc]

还是老样子！
Exception in thread "main" java.sql.SQLException: Communication failure during h
andshake. Is there a server running on localhost:3306?
at org.gjt.mm.mysql.MysqlIO.init(MysqlIO.java:327)
at org.gjt.mm.mysql.Connection.connectionInit(Connection.java:261)
at org.gjt.mm.mysql.jdbc2.Connection.connectionInit(Connection.java:89)
at org.gjt.mm.mysql.Driver.connect(Driver.java:167)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:193)
at ConnMysql.main(ConnMysql.java:29)

[minghui000]

up

[misssth]

String url ="jdbc:mysql://localhost:3306/samp_db?";
这样子吧，要不就是password不对

[misssth]

你再建一个数据库用户是以下

[quickpoint]

你启动了mysqld吗?

[quickpoint]

如果在windows下就启动mysqld-nt
如果在linux下就启动mysqld_safe &
或者视你的版本而言启动safe_mysqld &

如果你输入mysql -u <your account> -p
********<your password>
可以进入的话，则启动了mysql服务器。
看样子好像是没有启动mysql服务器。

[zez]

你的mysql根本没有启动呀...
或者端口号不对

[nwsl]

你启动了mysqld吗?
端口号是3306吗？

[fxltsbl]

我用com.mysql.jdbc.Driver驱动，连接一次，成功一次。感觉算爽死了。
Connection con=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test","root","123");
敢问高手，到底哪个驱动更牛一点，更好一点。
谢了

[ice_yu]

3306端口被占用了
你换一个其它的端口

[zk104]

up

[hoc]

我自己搞定了，，原来需要两个驱动，我自己装的是j2sdk1.5.0.1
需要org和com俩个驱动都装上，我也不知道为什么，可能是版本驱动的问题。我总是喜欢最高版本，
虽然计算机配置不高！