sqoop mysql Last packet sent to the server was 1 ms ago

sqoop import --connect jdbc:mysql://localhost:3306/ptx --username hadoop --password ha
doop --table testsqoop -m 1 --num-mappers 5 --append

** BEGIN NESTED EXCEPTION ** 

java.net.ConnectException
MESSAGE: Connection refused

STACKTRACE:

java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.(Socket.java:375)
at java.net.Socket.(Socket.java:218)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
at com.mysql.jdbc.MysqlIO.(MysqlIO.java:271)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2771)
at com.mysql.jdbc.Connection.(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at org.apache.sqoop.mapreduce.db.DBConfiguration.getConnection(DBConfiguration.java:184)
at org.apache.sqoop.mapreduce.db.DBInputFormat.getConnection(DBInputFormat.java:187)
at org.apache.sqoop.mapreduce.db.DBInputFormat.setConf(DBInputFormat.java:162)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:573)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
at org.apache.hadoop.mapred.Child.main(Child.java:170)

** END NESTED EXCEPTION **

Last packet sent to the server was 1 ms ago.
at org.apache.sqoop.mapreduce.db.DBInputFormat.getConnection(DBInputFormat.java:193)
at org.apache.sqoop.mapreduce.db.DBInputFormat.setConf(DBInputFormat.java:162)
... 5 more
Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

java.net.ConnectException

MESSAGE: Connection refused

解决方法：将localhost改为主机名或IP