javaweb连接不到数据库了,出现这样的错误，有大神可以解决吗

Question

Mon Jun 10 15:31:18 CST 2019 : 已使用基本服务器安全策略安装了安全管理程序。
Mon Jun 10 15:31:20 CST 2019 : access denied ("java.net.SocketPermission" "localhost:1527" "listen,resolve")
java.security.AccessControlException: access denied ("java.net.SocketPermission" "localhost:1527" "listen,resolve")
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
at java.security.AccessController.checkPermission(AccessController.java:884)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at java.lang.SecurityManager.checkListen(SecurityManager.java:1131)
at java.net.ServerSocket.bind(ServerSocket.java:374)
at java.net.ServerSocket.(ServerSocket.java:237)
at javax.net.DefaultServerSocketFactory.createServerSocket(ServerSocketFactory.java:231)
at org.apache.derby.impl.drda.NetworkServerControlImpl.createServerSocket(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.access$000(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.derby.impl.drda.NetworkServerControlImpl.blockingStart(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.executeWork(Unknown Source)
at org.apache.derby.drda.NetworkServerControl.main(Unknown Source)

Answer 1

jdbc:mysql://必须写

localhost是地址，本地用localhost,远程写ip（但是远程要配置服务器的数据库，允许远程访问，自己试了一下失败了，等修好再写一篇）

:3306(数据库默认端口号，和tomcat默认8080一样，可以改)

swu_db数据库名字

characterEncoding=utf-8编码用UTF-8

serverTimezone=UTC时区，也可以改数据库的

useSSL=false不用ssl

allowPublicKeyRetrieval=true应该是涉及到公钥之类的安全认证吧