最近一直让我发疯，希望有人能帮助我。
我一直在尝试从谷歌应用引擎（春季启动应用）连接谷歌云sql（第二代），但没有运气。我按照此页https://cloud.google.com/appengine/docs/flexible/java/using-cloud-sql上的说明获取连接字符串。可以从我的本地计算机连接到谷歌云sql。
另外，我的app引擎和google sql实例来自同一个项目。我还验证了我可以从goole app engine的cloud shell连接到google sql
我想知道哪个是正确的连接字符串。我试过这两个连接模板，但没有运气
＆＃34; JDBC：谷歌：MySQL的：// $ {INSTANCE_CONNECTION_NAME} / $ {数据库}用户= $ {用户}＆安培;密码= $ {密码}＆＃34;
＆＃34; JDBC：MySQL的：//谷歌/ $ {数据库} useSSL =假安培; cloudSqlInstance = $ {INSTANCE_CONNECTION_NAME}＆安培;的SocketFactory = com.google.cloud.sql.mysql.SocketFactory＆安培;用户= $ {用户}＆安培;密码= $ {密码}＆＃34;
这是来自google cloud的日志跟踪：
017-11-17 00:20:51 default[20171117t071753] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
2017-11-17 00:20:51 default [20171117t071753]引起：com.mysql.jdbc.exceptions.jdbc4.CommunicationsException：通讯链接失败 2017-11-17 00:20:51默认[20171117t071753] 2017-11-17 00:20:51默认[20171117t071753]成功发送到服务器的最后一个数据包是0毫秒前。驱动程序未收到来自服务器的任何数据包。 2017-11-17 00:20:51默认[20171117t071753] at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method）〜[na：1.8.0_131] 2017-11-17 00:20:51默认[20171117t071753] at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）〜[na：1.8.0_131] 2017-11-17 00:20:51默认[20171117t071753] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）〜[na：1.8.0_131] 2017-11-17 00:20:51默认[20171117t071753] at java.lang.reflect.Constructor.newInstance（Constructor.java:423）〜[na：1.8.0_131] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.Util.handleNewInstance（Util.java:425）〜[mysql-connector-java-5.1.43.jar！/：5.1.43 ] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.SQLError.createCommunicationsException（SQLError.java:989)~ [mysql-connector-java-5.1.43.jar！/：5.1.43 ] 2017-11-17 00:20:51默认[20171117t071753]在com.mysql.jdbc.MysqlIO。（MysqlIO.java:341）〜[mysql-connector-java-5.1.43.jar！/：5.1.43] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.ConnectionImpl.coreConnect（ConnectionImpl.java:2196)~ [mysql-connector-java-5.1.43.jar！/：5.1.43 ] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly（ConnectionImpl.java:2229)~ [mysql-connector-java-5.1.43.jar！/：5.1.43 ] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.ConnectionImpl.createNewIO（ConnectionImpl.java:2024）〜[mysql-connector-java-5.1.43.jar！/：5.1.43 ] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.ConnectionImpl。（ConnectionImpl.java:779）〜[mysql-connector-java-5.1.43.jar！/：5.1.43] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.JDBC4Connection。（JDBC4Connection.java:47）〜[mysql-connector-java-5.1.43.jar！/：5.1.43] 2017-11-17 00:20:51默认[20171117t071753] at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method）〜[na：1.8.0_131] 2017-11-17 00:20:51默认[20171117t071753] at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）〜[na：1.8.0_131] 2017-11-17 00:20:51默认[20171117t071753] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）〜[na：1.8.0_131] 2017-11-17 00:20:51默认[20171117t071753] at java.lang.reflect.Constructor.newInstance（Constructor.java:423）〜[na：1.8.0_131] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.Util.handleNewInstance（Util.java:425）〜[mysql-connector-java-5.1.43.jar！/：5.1.43 ] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.ConnectionImpl.getInstance（ConnectionImpl.java:389）〜[mysql-connector-java-5.1.43.jar！/：5.1.43 ] 2017-11-17 00:20:51默认[20171117t071753] at com.mysql.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:330）〜[mysql-connector-java-5.1.43.jar！/：5.1.43 ] 2017-11-17 00:20:51默认[20171117t071753] at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver（PooledConnection.java:310）〜[tomcat-jdbc-8.5.16.jar！/：na ] 2017-11-17 00:20:51默认[20171117t071753] at org.apache.tomcat.jdbc.pool.PooledConnection.connect（PooledConnection.java:203）〜[tomcat-jdbc-8.5.16.jar！/：na ] 2017-11-17 00:20:51默认[20171117t071753] at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection（ConnectionPool.java:735）〜[tomcat-jdbc-8.5.16.jar！/：na ] 2017-11-17 00:20:51默认[20171117t071753] org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection（ConnectionPool.java:667）〜[tomcat-jdbc-8.5.16.jar！/：na ] 2017-11-17 00:20:51默认[20171117t071753] org.apache.tomcat.jdbc.pool.ConnectionPool.init（ConnectionPool.java:482）〜[tomcat-jdbc-8.5.16.jar！/：na ] 2017-11-17 00:20:51默认[20171117t071753] at org.apache.tomcat.jdbc.pool.ConnectionPool。（ConnectionPool.java:154）〜[tomcat-jdbc-8.5.16.jar！/：na] 2017-11-17 00:20:51默认[20171117t071753] at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool（DataSourceProxy.java:118)~ [tomcat-jdbc-8.5.16.jar！/：na ] 2017-11-17 00:20:51默认[20171117t071753] at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool（DataSourceProxy.java:107）〜[tomcat-jdbc-8.5.16.jar！/：na ] 2017-11-17 00:20:51默认[20171117t071753] at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection（DataSourceProxy.java:131）〜[tomcat-jdbc-8.5.16.jar！/：na ] 2017-11-17 00:20:51默认[20171117t071753] at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection（DataSourceUtils.java:111）〜[spring-jdbc-4.3.10.RELEASE.jar！/：4.3 .10.RELEASE] 2017-11-17 00:20:51默认[20171117t071753] at org.springframework.jdbc.datasource.DataSourceUtils.getConnection（DataSourceUtils.java:77）〜[spring-jdbc-4.3.10.RELEASE.jar！/：4.3 .10.RELEASE] 2017-11-17 00:20:51默认[20171117t071753] ... 29个常用框架省略 2017-11-17 00:20:51默认[20171117t071753]引起：java.net.UnknownHostException：google at java.net.InetAddress.getAllByName0（InetAddress.java:1280）〜[na：1.8.0_131] java。 net.InetAddress.getAllByName（InetAddress.java:1192）〜[na：1.8.0_131] at java.net.InetAddress.getAllByName（InetAddress.java:1126)~ [na：1.8.0_131] at com.mysql.jdbc。 com.mysql.jdbc.MysqlIO上的StandardSocketFactory.connect（StandardSocketFactory.java:188)~ [mysql-connector-java-5.1.43.jar！/：5.1.43]。（MysqlIO.java:300）〜[mysql-连接器的Java-5.1.43.jar /：43年5月1日]
答案 0 :(得分：0)
在我的应用程序属性中，我使用jdbc：mysql：// [host]：[port] / [dbname]？autoReconnect = true＆amp; useSSL = false表示url属性，它可以正常工作。
但在我看来，您的错误是由于您必须在您的cloud-sql实例的授权部分授权您的应用引擎的IP地址。