mysql-java.net.UnknownHostException: hostname

java.net.UnknownHostException: hostname

用jsp連接mysql數據庫時出現了這樣的錯誤，怎麼解決？

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.UnknownHostException
MESSAGE: hostname

STACKTRACE:

java.net.UnknownHostException: hostname

最佳回答：

提示得很清楚，沒有找到hostname,你怎麼寫的連接字符串