자바를 사용하여 TCP 연결 만들기
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자바를 사용하여 PostgreSQL용 Cloud SQL에 TCP 연결을 엽니다.
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코드 샘플
Java
PostgreSQL용 Cloud SQL에 인증하려면 애플리케이션 기본 사용자 인증 정보를 설정합니다.
자세한 내용은 로컬 개발 환경의 인증 설정을 참조하세요.
달리 명시되지 않는 한 이 페이지의 콘텐츠에는 Creative Commons Attribution 4.0 라이선스에 따라 라이선스가 부여되며, 코드 샘플에는 Apache 2.0 라이선스에 따라 라이선스가 부여됩니다. 자세한 내용은 Google Developers 사이트 정책을 참조하세요. 자바는 Oracle 및/또는 Oracle 계열사의 등록 상표입니다.
[[["이해하기 쉬움","easyToUnderstand","thumb-up"],["문제가 해결됨","solvedMyProblem","thumb-up"],["기타","otherUp","thumb-up"]],[["이해하기 어려움","hardToUnderstand","thumb-down"],["잘못된 정보 또는 샘플 코드","incorrectInformationOrSampleCode","thumb-down"],["필요한 정보/샘플이 없음","missingTheInformationSamplesINeed","thumb-down"],["번역 문제","translationIssue","thumb-down"],["기타","otherDown","thumb-down"]],[],[],[],null,["# Create a TCP connection by using Java\n\nOpen a TCP connection to Cloud SQL for PostgreSQL by using Java.\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Connect from App Engine flexible environment](/sql/docs/postgres/connect-app-engine-flexible)\n- [Connect from App Engine standard environment](/sql/docs/postgres/connect-app-engine-standard)\n- [Connect from Cloud Build](/sql/docs/postgres/connect-build)\n- [Connect from Cloud Run](/sql/docs/postgres/connect-run)\n- [Connect from Cloud Run functions](/sql/docs/postgres/connect-functions)\n- [Connect using the Cloud SQL Auth Proxy](/sql/docs/postgres/connect-auth-proxy)\n- [Manage database connections](/sql/docs/postgres/manage-connections)\n\nCode sample\n-----------\n\n### Java\n\n\nTo authenticate to Cloud SQL for PostgreSQL, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n\n import com.zaxxer.hikari.HikariConfig;\n import com.zaxxer.hikari.HikariDataSource;\n import javax.sql.DataSource;\n\n public class TcpConnectionPoolFactory extends ConnectionPoolFactory {\n\n // Note: Saving credentials in environment variables is convenient, but not\n // secure - consider a more secure solution such as\n // Cloud Secret Manager (https://cloud.google.com/secret-manager) to help\n // keep secrets safe.\n private static final String DB_USER = System.getenv(\"DB_USER\");\n private static final String DB_PASS = System.getenv(\"DB_PASS\");\n private static final String DB_NAME = System.getenv(\"DB_NAME\");\n\n private static final String INSTANCE_HOST = System.getenv(\"INSTANCE_HOST\");\n private static final String DB_PORT = System.getenv(\"DB_PORT\");\n\n\n public static DataSource createConnectionPool() {\n // The configuration object specifies behaviors for the connection pool.\n HikariConfig config = new HikariConfig();\n\n // The following URL is equivalent to setting the config options below:\n // jdbc:postgresql://\u003cINSTANCE_HOST\u003e:\u003cDB_PORT\u003e/\u003cDB_NAME\u003e?user=\u003cDB_USER\u003e&password=\u003cDB_PASS\u003e\n // See the link below for more info on building a JDBC URL for the Cloud SQL JDBC Socket Factory\n // https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory#creating-the-jdbc-url\n\n // Configure which instance and what database user to connect with.\n config.setJdbcUrl(String.format(\"jdbc:postgresql://%s:%s/%s\", INSTANCE_HOST, DB_PORT, DB_NAME));\n config.setUsername(DB_USER); // e.g. \"root\", \"postgres\"\n config.setPassword(DB_PASS); // e.g. \"my-password\"\n\n\n // ... Specify additional connection properties here.\n // ...\n\n // Initialize the connection pool using the configuration object.\n return new HikariDataSource(config);\n }\n }\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=cloud_sql_postgres)."]]