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Connecting Java Applications to PostgreSQL with JDBC and HikariCP

AddPostgreSQLJDBCandHikariCPdependenciesviaMavenorGradle.2.ConfigureHikariCPwithdatabaseURL,credentials,poolsize,timeouts,andPostgreSQLoptimizationslikepreparedstatementcaching.3.UsetheHikariDataSourceinyourapplicationtoobtainpooledconnectionsandexec

Jul 25, 2025 am 02:15 AM

Building Real-time Java Applications with WebSockets

WebSocketsenablereal-timecommunicationinJavaappsbymaintainingopenconnections.1.UseJSR356viaJavaEE7 orframeworkslikeSpring.2.Ensureserversupport(Tomcat8 ,Jetty9 ,WildFly).3.AddMavendependencyandannotateendpointswith@ServerEndpoint.4.ManagesessionsviaS

Jul 25, 2025 am 02:03 AM

A Guide to Google Guava for Modern Java Developers

GuavaremainsvaluableformodernJavadevelopersbyprovidingimmutablecollectionslikeImmutableListandImmutableSet,whichensurethreadsafetyandpreventaccidentalmodifications.2.ItofferspracticalutilitiessuchasPreconditionsforcleaninputvalidation,Objects.equal()

Jul 25, 2025 am 02:01 AM

Serverless Java with AWS Lambda and API Gateway

JavacanbeeffectivelyusedwithAWSLambdaandAPIGatewaydespitecommonpreferencesforNode.jsorPython.1.Javaoffersstrongtyping,existingcodebasereuse,goodpost-warmperformance,andGraalVMsupportfornativecompilationtoreducecoldstarts.2.UseAWSLambdaJavaCoreandEven

Jul 25, 2025 am 01:55 AM

How to measure execution time in Java?

1. Use System.currentTimeMillis() to measure millisecond time-consuming, suitable for general scenarios; 2. Use System.nanoTime() to measure nanosecond accuracy, suitable for micro benchmarking; 3. Use JMH to perform professional benchmarking, suitable for performance comparison and formal scenarios. There are three main methods for measuring code execution time in Java: the first is to subtract the start and end timestamps by System.currentTimeMillis() to obtain the millisecond-level time-consuming, which is simple and intuitive but not high accuracy; the second is to use System.nanoTime() to obtain the nanosecond-level time difference with higher precision, which is suitable for small pieces of code that are sensitive to performance; the third is to use J

Jul 25, 2025 am 01:54 AM

Java Functional Programming Concepts and Patterns

The core concepts of Java support for functional programming include: 1. Use functional interfaces and Lambda expressions to simplify code, such as Function, Consumer, Predicate and other interfaces to cooperate with Lambda to achieve concise logic; 2. Emphasize immutability and pure functions to avoid side effects, and ensure that the object state is not modified through final classes and immutable collections; 3. Use StreamAPI for declarative data processing, support chain calls to filter, map, reduce and other operations, and have lazy loading characteristics; 4. Implement higher-order functions, pass or return functions as parameters, and improve code reusability; 5. Common patterns include using Optional to avoid null pointers and method references.

Jul 25, 2025 am 01:45 AM

how to convert array to list in java

In Java, common ways to convert arrays to List include using Arrays.asList(), combining ArrayList constructor to obtain mutable lists, and handling more complex conversion requirements through streaming. 1. Using Arrays.asList(arr) is the most direct way, which is suitable for object arrays (such as String[], Integer[]), but the returned List is immutable and cannot be added or removed; 2. If a mutable list is needed, it can be created through newArrayList(Arrays.asList(arr)), which supports addition and deletion operations; 3. For basic arrays (such as int[]), use Array directly.

Jul 25, 2025 am 01:32 AM

A Guide to Internationalization (i18n) in Java Applications

Java'sinternationalization(i18n)enablesapplicationstoadapttodifferentlanguagesandregionsusingLocaleandResourceBundle.1.UseLocaleobjects(e.g.,en_US,fr_FR)toidentifyregionsandloadcorrespondingresourcebundles(messages_en.properties,messages_fr.propertie

Jul 25, 2025 am 01:32 AM

Building Real-Time Applications with Java and WebSockets

WebSocketsenablereal-time,bidirectionalcommunicationinwebapplications,whichisessentialforfeatureslikelivechatandnotifications;unlikeHTTP,theyallowserverstopushdatainstantlytoclients.1.UseSpringBootwiththespring-boot-starter-websocketdependencytosimpl

Jul 25, 2025 am 01:31 AM

Advanced Guide to Java Cryptography Architecture (JCA)

JavaCryptographyArchitecture (JCA) is a flexible and powerful framework for providing encryption services for Java applications; it builds a modular architecture through Provider, Service and EngineClasses, supporting encryption, decryption, digital signature, message digest, key generation and secure random number generation; 1. Use Security.getProviders() to view installed providers, and give priority to standard providers such as SUN, SunJCE or BouncyCastle; 2. Generate symmetric keys through KeyGenerator (such as AES-256, and ensure that JCE does not have any

Jul 25, 2025 am 01:29 AM

From Monolith to Microservices: A Migration Strategy for Java Applications

Startbyclearlydefiningthemotivationandscope,focusingonboundedcontextsfromDomain-DrivenDesigntoidentifyindependentmoduleslikeOrderManagementorUserAuthentication.2.ApplytheStranglerFigpatterntograduallyreplacemonolithfunctionality,routingtrafficviaanAP

Jul 25, 2025 am 01:22 AM

java microservices

Optimizing Java Applications on ARM Processors

TooptimizeJavaapplicationsonARM,selectatunedJVMlikeAzulZuluorAmazonCorretto,useJDK17orlater,andtestARM-specificbuilds.Next,tunegarbagecollectionbyswitchingtoZGCorShenandoah,monitorGClogs,andoptimizeheapsize.Then,explorenativecompilationviaGraalVMNati

Jul 25, 2025 am 01:17 AM

java arm processor

Java Security Best Practices for Microservices API Gateway

To ensure the security of the API gateway implemented by Java, we need to start from four aspects: authentication, authorization, current limit, logging, and secure communication. 1. Use OAuth2 or JWT to achieve stateless authentication, combine SpringSecurity verification tokens, and control role permissions through path matching; 2. Use Redis Lua script to achieve distributed current limit, configure different levels of policies, and combine the circuit breaker mechanism to prevent system crashes; 3. Record information such as request source IP, user identity, etc., generate traceId tracking links through MDC to avoid recording sensitive data; 4. Enable HTTPS encrypted communication, use TLS1.2 or above, both internal and external networks use bidirectional TLS, and regularly update certificates to ensure security.

Jul 25, 2025 am 01:15 AM

Using Testcontainers for Reliable Integration Testing in Java

Using Testcontainers can solve the reliability problem of relying on external services in Java integration testing. 1. Add Testcontainers dependencies in Maven or Gradle, such as PostgreSQL and JUnitJupiter modules; 2. Write real integration tests, start PostgreSQL container through @Container, and inject database connection information in combination with @DynamicPropertySource to ensure that the test is consistent with the production environment; 3. Optionally set postgres.setReuse(true) multiplex containers to speed up local testing, but prohibit use in CI/CD to prevent state residues from causing tests

Jul 25, 2025 am 12:54 AM