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how to make an http request in java

There are three common ways to initiate HTTP requests in Java. 1. Use the HttpURLConnection class that comes with Java to complete basic GET or POST requests, which is suitable for simple scenarios; 2. The introduction of ApacheHttpClient can simplify operations, support richer functions, and are suitable for enterprise-level projects; 3. Use OkHttp to achieve efficient requests, the API is simple and supports synchronous asynchronous, which is suitable for modern application development. Just select the right tool according to the project needs.

Jul 27, 2025 am 02:40 AM

Benchmarking Java Code with JMH (Java Microbenchmark Harness)

The reason why the JVM optimization mechanism (such as dead code elimination, JIT compilation) will cause the result to be distorted; 1. Use JMH to add jmh-core and jmh-generator-annprocess dependencies; 2. Use @Benchmark annotation to mark the test method and use Blackhole to prevent the results from being optimized; 3. Use @BenchmarkMode, @Warmup, @Measurement, @Fork, @State and other annotations to reasonably configure the test environment; 4. Start JMH through the main method during runtime to avoid manual loop testing to ensure that the results are accurate and trustworthy.

Jul 27, 2025 am 02:40 AM

Using Java for Data Science and Big Data Analytics

Javaisnottheprimarylanguageforexploratorydatasciencebutplaysacriticalroleinbigdataandenterpriseanalytics.1.MajorframeworkslikeHadoop,Spark,Kafka,andFlinkarebuiltonorcompatiblewiththeJVM,makingJavaessentialforlarge-scaledataprocessing.2.Javaoffersrobu

Jul 27, 2025 am 02:37 AM

The Power of Java Records for Immutable Data

Javarecordsareidealformodelingimmutabledata,astheyautomaticallygenerateconstructors,accessors,equals,hashCode,andtoStringmethods,ensuringimmutabilityandreducingboilerplate;1.Recordsprovidetransparent,safedatacarriersperfectforDTOs,configurationholder

Jul 27, 2025 am 02:34 AM

Optimizing Database Interactions in a Java Application

UseconnectionpoolingwithHikariCPtoreusedatabaseconnectionsandreduceoverhead.2.UsePreparedStatementtopreventSQLinjectionandimprovequeryperformance.3.Fetchonlyrequireddatabyselectingspecificcolumnsandapplyingfiltersandpagination.4.Usebatchoperationstor

Jul 27, 2025 am 02:32 AM

java database

Java and GraalVM: Ahead-of-Time Compilation for Native Images

Java can realize native compilation through GraalVM's NativeImage to get rid of JVM dependencies; 1. Use AOT compilation to convert Java bytecode into a local executable file; 2. Significantly improve the startup speed to milliseconds, reduce memory usage to about 50MB, and realize independent deployment of single files; 3. Install GraalVM and configure native-image tools to generate images through Maven or SpringBoot3's build-image; 4. Pay attention to the explicit registration of features such as reflection and dynamic proxy. Some JNI and dynamic loading are not supported, the construction time is long and debugging is difficult; 5. Suitable for microservices, Serverless and CLI tools, Spr is recommended

Jul 27, 2025 am 02:30 AM

Building an API Gateway with Java and Spring Cloud Gateway

To build a Java-based API gateway, using SpringCloudGateway is an efficient and scalable solution. 1. Create a project through SpringInitializr and introduce WebFlux, Gateway, EurekaClient and Actuator dependencies; 2. Configure routing rules in application.yml to support static URI or Eureka-based service discovery dynamic routing; 3. Add global filters to implement JWT authentication, implement current limit through Redis, limit 10 requests per second per IP, and 20 bursts; 4. Integrate Resilience4j to implement circuit breakers, configure fallback downgrade logic

Jul 27, 2025 am 02:25 AM

A Deep Dive into Java Memory Model and its Guarantees

TheJavaMemoryModel(JMM)definesvisibilityandorderingguaranteesinmultithreadedprograms;1.Thehappens-beforerelationshipensuresthatwritesarevisibletootherthreadswhenestablishedthroughruleslikeprogramorder,monitorlocks,volatilevariables,threadstart/join,a

Jul 27, 2025 am 02:22 AM

A Practical Guide to the Java Streams API for Data Processing

JavaStreamsAPIenablesfunctional-styledataprocessingbycreatingstreamsfromcollections,arrays,orfactories,applyingintermediateoperationslikefilter,map,andflatMaptotransformdatalazily,thenusingterminaloperationssuchascollect,count,orfindFirsttoproduceres

Jul 27, 2025 am 02:16 AM

Optimizing Database Queries in a Java Application

StrategicallyuseindexesonfrequentlyqueriedcolumnsinWHERE,JOIN,andORDERBYclauses,includingcompositeindexesformulti-columnfilters,whileavoidingover-indexingtopreventwriteperformancedegradation;2.OptimizeJPA/HibernatebyresolvingtheN 1queryproblemwithJOI

Jul 27, 2025 am 02:15 AM

Optimizing Database Queries in a Java Persistence Layer

1. To solve the N 1 query problem, you need to use JOINFETCH or @EntityGraph; 2. Restrict the result set size through paging and cursor paging; 3. Reasonably configure entity mapping and lazy loading to avoid loading too much associated data; 4. Use DTO projection to query only the required fields; 5. Enable Level 2 cache and reasonably configure the cache strategy; 6. Turn on SQL logs and use tools to analyze the generated SQL performance; 7. Use native SQL to improve efficiency through complex operations; 8. Create database indexes for common query conditions and use execution plan analysis; the core of optimization is to reduce database round trips, reduce data transmission, and select appropriate acquisition strategies based on the scenario, and ultimately continuously improve performance through monitoring.

Jul 27, 2025 am 02:04 AM

A Deep Dive into the Java Virtual Machine (JVM) Internals

TheJVMenablesJava’s"writeonce,runanywhere"capabilitybymanagingcodeexecutionthroughkeyinternalcomponents.1)Classloaders(Bootstrap,Extension,Application)load.classfilesinadelegationhierarchy,storingclassmetadataintheMethodArea.2)Runtimedataar

Jul 27, 2025 am 01:55 AM

How to Secure a Java Web Application from OWASP Top 10 Vulnerabilities

UsePreparedStatementandparameterizedqueriestopreventinjection;2.ImplementSpringSecuritywithstrongpasswordhashingandMFAforsecureauthentication;3.EnforceRBACwith@PreAuthorizeanddeny-by-defaultaccesscontrol;4.EncryptdataintransitwithTLS1.2 andatrestusin

Jul 27, 2025 am 01:54 AM

GraalVM Native Image: Compiling Your Java Application Ahead-of-Time

GraalVMNativeImage converts Java applications into native executable files through AOT compilation, solving the problems of slow startup and high memory usage in the traditional JVM mode. 1. The startup speed is milliseconds, suitable for Serverless and microservices; 2. The memory usage is reduced by 30% to 70%; 3. The deployment package is smaller, and there is no need to carry JVM; 4. The security is improved and the attack surface is reduced. Note when using: 1. Reflection, dynamic proxy, etc. need to be explicitly configured; 2. Resource files need to be included through resource-config.json; 3. Dynamic class loading is limited; 4. Some libraries that rely on ASM or dynamically generate bytecode are incompatible. Mainstream frameworks such as SpringBoot3 and Quarkus

Jul 27, 2025 am 01:53 AM

java compile