Communications link failure Last packet sent to the server was 0 ms ago

Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.
 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:406)
 at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
 at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2120)
 at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:723)
 at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
 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:406)
 at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)
 at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
 at java.sql.DriverManager.getConnection(Unknown Source)
 at java.sql.DriverManager.getConnection(Unknown Source)
 at test.JDBCTest.main(JDBCTest.java:12)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.
 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:406)
 at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
 at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:335)
 at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2043)
 ... 12 more
Caused by: java.net.UnknownHostException: localhaost
 at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
 at java.net.InetAddress$1.lookupAllHostAddr(Unknown Source)
 at java.net.InetAddress.getAddressFromNameService(Unknown Source)
 at java.net.InetAddress.getAllByName0(Unknown Source)
 at java.net.InetAddress.getAllByName(Unknown Source)
 at java.net.InetAddress.getAllByName(Unknown Source)
 at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:243)
 at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:284)
 ... 13 more

 

開始的時候"jdbc:mysql://localhost:3306/world","admin","admin"寫錯了