mysql数据库问题java问题

Question

我感觉是mysql数据库问题，那个懂数据库的来告诉告诉我

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
关于这个问题，需要数据库调配置吗

Answer 1

#贴下源码，这样其他人才可以帮你分析一下

一般造成这个异常的情况有很多种，下面就简单的提示一些，希望对你有帮助。

• IP address or hostname in JDBC URL is wrong.
• Hostname in JDBC URL is not recognized by local DNS server.
• Port number is missing or wrong in JDBC URL.
• DB server is down.
• DB server doesn't accept TCP/IP connections.
• DB server has run out of connections.
• Something in between Java and DB is blocking connections, e.g. a firewall or proxy.

参考文章

• com-mysql-jdbc-exceptions-jdbc4-communicationsexception-communications-link-fai