Java 使用JDBC连接到MySQL
我一直试图在eclipse中使用JDBC连接到我的外部MySQL服务器位置,但我一直收到一个错误。这是我的密码:Java 使用JDBC连接到MySQL,java,mysql,jdbc,localhost,Java,Mysql,Jdbc,Localhost,我一直试图在eclipse中使用JDBC连接到我的外部MySQL服务器位置,但我一直收到一个错误。这是我的密码: import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import com.mysql.jdbc.Pre
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.mysql.jdbc.PreparedStatement;
//import com.mysql.jdbc.Driver;
public class Main {
public static void main(String[] args) throws SQLException {
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection conn=DriverManager.getConnection("jdbc:mysql://mysql10.000webhost.com/database","username","password");
java.sql.PreparedStatement statement = conn.prepareStatement("SELECT * FROM promoid");
ResultSet result=statement.executeQuery();
while(result.next())
{
System.out.println(result.getString(1));
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
以下是我得到的错误:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2479)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2516)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2301)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Main.main(Main.java:15)
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
... 15 more
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:通信链路故障
成功发送到服务器的最后一个数据包是0毫秒前的。驱动程序尚未从服务器收到任何数据包。
位于sun.reflect.NativeConstructorAccessorImpl.newInstance0(本机方法)
位于sun.reflect.NativeConstructorAccessorImpl.newInstance(未知源)
位于sun.reflect.delegatingConstructor或AccessorImpl.newInstance(未知源)
位于java.lang.reflect.Constructor.newInstance(未知源)
位于com.mysql.jdbc.Util.HandleneInstance(Util.java:411)
位于com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
在com.mysql.jdbc.MysqlIO上(MysqlIO.java:355)
位于com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2479)
位于com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2516)
位于com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2301)
位于com.mysql.jdbc.ConnectionImpl(ConnectionImpl.java:834)
位于com.mysql.jdbc.JDBC4Connection(JDBC4Connection.java:47)
位于sun.reflect.NativeConstructorAccessorImpl.newInstance0(本机方法)
位于sun.reflect.NativeConstructorAccessorImpl.newInstance(未知源)
位于sun.reflect.delegatingConstructor或AccessorImpl.newInstance(未知源)
位于java.lang.reflect.Constructor.newInstance(未知源)
位于com.mysql.jdbc.Util.HandleneInstance(Util.java:411)
位于com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
位于com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
位于java.sql.DriverManager.getConnection(未知源)
位于java.sql.DriverManager.getConnection(未知源)
Main.Main(Main.java:15)
原因:java.net.ConnectException:连接超时:连接
位于java.net.PlainSocketImpl.socketConnect(本机方法)
位于java.net.PlainSocketImpl.doConnect(未知源)
位于java.net.PlainSocketImpl.connectToAddress(未知源)
位于java.net.PlainSocketImpl.connect(未知源)
位于java.net.socksocketimpl.connect(未知源)
位于java.net.Socket.connect(未知源)
位于java.net.Socket.connect(未知源)
位于java.net.Socket。(未知源)
位于java.net.Socket。(未知源)
位于com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
在com.mysql.jdbc.MysqlIO上(MysqlIO.java:305)
... 还有15个
JDBC不能连接到localhost之外的数据库吗
Caused by: java.net.ConnectException: Connection timed out: connect.
您是否尝试在主机mysql10.000webhost.com
上远程登录到端口3306
(mysql默认设置)
我打赌他们正在防火墙上阻止你。如果我将java小程序上传到FTP,然后从同一台服务器上运行它,它会工作吗?