本地：我的本地环境是 Mac OS。我正在尝试使用 Java 8 连接到我的 Cloud SQL (PostgreSQL) 数据库。我已将我的 IP 列入白名单，并且能够使用 pgadmin 连接到数据库。我的服务帐户也是托管数据库的项目和应用引擎环境的项目所有者
这是我用来本地连接的教程：
https://cloud.google.com/sql/docs/postgres/connect-external-app#java
和我的实际代码：
private static void jdbcUrl = String.format(
"jdbc:postgresql://google/%s?socketFactory=com.google.cloud.sql.postgres.SocketFactory"
+ "&cloudSqlInstance=%s",
Configuration.getDatabaseName(),
Configuration.getInstanceConnectionName());
public static String getDbConnection() throws Exception {
LOGGER.info(jdbcUrl);
Connection connection = DriverManager.getConnection(jdbcUrl, Configuration.getUsername(), Configuration.getPassword());
... }
这是在我的代码中生成的 url 调用（出于明显目的，我已经更改了原始代码）：
jdbc:postgresql://google/users?socketFactory=com.google.cloud.sql.postgres.SocketFactory&cloudSqlInstance=my-project:europe-west1:my-db
由于此错误，我无法连接此呼叫：
Nov 29, 2018 7:13:11 PM com.google.cloud.sql.postgres.SocketFactory createSocket
INFO: Connecting to Cloud SQL instance [my-project:europe-west1:my-db] via ssl socket.
Nov 29, 2018 7:13:11 PM com.google.cloud.sql.core.SslSocketFactory getInstance
INFO: First Cloud SQL connection, generating RSA key pair.
Nov 29, 2018 7:13:12 PM com.google.cloud.sql.core.SslSocketFactory fetchInstanceSslInfo
INFO: Obtaining ephemeral certificate for Cloud SQL instance [my-project:europe-west1:my-db].
Nov 29, 2018 7:13:13 PM com.google.cloud.sql.core.SslSocketFactory createAndConfigureSocket
INFO: Connecting to Cloud SQL instance [my-project:europe-west1:my-db] on IP [30.100.40.150].
org.postgresql.util.PSQLException: The connection attempt failed.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:292)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195)
at org.postgresql.Driver.makeConnection(Driver.java:454)
at org.postgresql.Driver.connect(Driver.java:256)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at com.ri.ccm.utils.DbConnection.getDbConnection(DbConnection.java:23)
at com.ri.ccm.routes.DummyRoute.serviceCategoryDetail(DummyRoute.java:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:76)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:148)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:191)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:200)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:103)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:272)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:268)
at org.glassfish.jersey.internal.Errors.process(Errors.java:316)
at org.glassfish.jersey.internal.Errors.process(Errors.java:298)
at org.glassfish.jersey.internal.Errors.process(Errors.java:268)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703)
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:416)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:370)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:389)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:342)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:229)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:833)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:206)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1621)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:541)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1593)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1239)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:481)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1562)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1141)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:118)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:564)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:210)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
at sun.security.ssl.InputRecord.read(InputRecord.java:503)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:983)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)
at com.google.cloud.sql.core.SslSocketFactory.createAndConfigureSocket(SslSocketFactory.java:210)
at com.google.cloud.sql.core.SslSocketFactory.create(SslSocketFactory.java:160)
at com.google.cloud.sql.postgres.SocketFactory.createSocket(SocketFactory.java:96)
at org.postgresql.core.PGStream.<init>(PGStream.java:62)
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:91)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:192)
... 64 more
但是，我可以通过此调用连接并取回数据：
jdbc:postgresql://30.100.40.150/users
唯一的问题是，我必须将每个 ip (0.0.0.0/24) 列入白名单，才能使该网址在 App Engine Flex（包括我的）中工作！现在，出于安全原因，我显然不想这样做。
通过 App Engine Flex：
jdbc:postgresql://30.100.40.150/users
我可以在 App Engine Flex 中连接此呼叫^，但我必须再次将每个 IP 列入白名单才能使其正常工作。该文档指出，我不必将 App Engine Flex 中的 IP 列入白名单即可正常工作（它应该只使用服务帐户）。我猜是原始电话，在文档中就是这样做的。然而，这是行不通的。所以我处于静止状态。
拜托，看在上帝的份上，有人可以帮助我。连接数据库应该不难！
我想要做的就是通过我的本地环境和我的 App Engine Flex 环境连接到我的远程 Cloud SQL PostgreSQL 数据库，而不必将每个 IP 地址列入白名单（并以“正确”的方式进行操作）。我正在使用 Maven 配置文件来区分我的环境。
我还尝试设置 Cloud SQL 代理以供本地使用，但它不起作用，我收到此错误：
couldn't connect to "my-project:europe-west1:my-db": read tcp 10.75.120.100:49663->30.100.40.150:3307: read: connection reset by peer
我真的没有想法了，这可能是防火墙端口问题吗？请帮忙 ：（