com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION ** java.net.SocketException
MESSAGE: java.net.ConnectException: Connection refused: connectSTACKTRACE:java.net.SocketException: java.net.ConnectException: Connection refused: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:151)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:280)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1774)
at com.mysql.jdbc.Connection.<init>(Connection.java:437)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:268)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Util.DBUtil.getConnection(DBUtil.java:15)
at dao.find.findbyid(find.java:18)
at dao.find.main(find.java:41)
** END NESTED EXCEPTION **
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1839)
at com.mysql.jdbc.Connection.<init>(Connection.java:437)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:268)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Util.DBUtil.getConnection(DBUtil.java:15)
at dao.find.findbyid(find.java:18)
at dao.find.main(find.java:41)
MESSAGE: java.net.ConnectException: Connection refused: connectSTACKTRACE:java.net.SocketException: java.net.ConnectException: Connection refused: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:151)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:280)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1774)
at com.mysql.jdbc.Connection.<init>(Connection.java:437)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:268)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Util.DBUtil.getConnection(DBUtil.java:15)
at dao.find.findbyid(find.java:18)
at dao.find.main(find.java:41)
** END NESTED EXCEPTION **
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1839)
at com.mysql.jdbc.Connection.<init>(Connection.java:437)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:268)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Util.DBUtil.getConnection(DBUtil.java:15)
at dao.find.findbyid(find.java:18)
at dao.find.main(find.java:41)
检查ip,端口(3306),用户名(root),密码等是否正确?
检查Mysql服务是否开启?
先用SQLyog连得试一下,能连通再去跑程序。
报错信息:MESSAGE: java.net.ConnectException: Connection refused: connect连接被拒绝,没连接上数据库