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Blockchain and digital currency technology in Java

Blockchain and digital currency technology are one of the hottest technologies today. This article will discuss blockchain and digital currency technology in Java. Blockchain is a chain structure network composed of multiple blocks, each block stores many transaction information. In Java, blockchain can be implemented using frameworks such as SpringBoot and Web3J. SpringBoot can be used to quickly create and configure Spring-based applications, and Web3J is a Java library that can be used to manage and

Jun 08, 2023 pm 10:32 PM

数字货币区块链Java

Operations and maintenance asked me to optimize the SpringBoot startup speed, and this is what I did!

SpringBoot is undoubtedly the largest framework for Java back-end development. Based on SpringBoot, there is a complete tool chain and various starters. For daily business development, it can be said that the wheels are complete. However, with the popularity of microservices and the cloud-native era, SpringBoot applications have exposed some problems, the most prominent of which are: slow startup applications, memory usage, and multi-cloud native applications that have relatively high startup speed requirements. When horizontal expansion is required, these new instances must be started within a short enough time to process new requests as quickly as possible. Cloud-native applications require as few resources as possible to run. Reducing the resources occupied by a single instance as much as possible means that

Jun 08, 2023 pm 06:52 PM

内存运维

Heterogeneous system integration and data integration technology in Java

With the development of big data and cloud computing technology, enterprises and organizations are faced with the challenges of integration and data exchange of multiple heterogeneous systems. In this context, Java's heterogeneous system integration and data integration technology has been widely used and developed. This article will discuss and introduce the concepts of heterogeneous system integration and data integration, the principles and applications of heterogeneous system integration and data integration in Java, and the advantages of heterogeneous system integration and data integration in Java. 1. The concepts of heterogeneous system integration and data integration Heterogeneous systems refer to different hardware

Jun 08, 2023 am 08:34 AM

Java异构系统集成数据集成技术

Redis cache example code analysis

1. Introduction 1. Scenario Since the data dictionary does not change very frequently, and the system accesses the data dictionary more frequently, it is necessary for us to store the data in the data dictionary in the cache to reduce database pressure and improve access speed. Here, we use Redis as the distributed cache middleware of the system. 2. RedisTemplate In the SpringBoot project, SpringDataRedis is integrated by default. SpringDataRedis provides a very convenient operation template for Redis, RedisTemplate, and can automatically manage the connection pool. 2. Introduce Redis1 and integrate the Redisservice-base module into the project.

Jun 03, 2023 pm 08:37 PM

redis

How SpringBoot uses AOP+Redis to prevent repeated submission of forms

Configure Redis1. Add Redis dependency org.springframework.bootspring-boot-starter-data-redis2. Add redis configuration information redis:host:127.0.0.1port:6379database:0password: #Connection timeout timeout:10s Configure AOP1. Custom annotations /***Annotations to prevent repeated submission of forms*/@Target(ElementType.METHOD)//The annotation targets the method @Retention(RetentionPolicy.RUNTI

Jun 03, 2023 pm 06:10 PM

redisSpringBootaop

How does Java SpringBoot operate Redis?

Redis1. Add redis dependency. springBoot provides a component package for Redis integration: spring-boot-starter-data-redis, which depends on spring-data-redis and lettuce. In addition, there are two small details here: in the SpringBoot1.x era, the bottom layer of spring-data-redis used Jedis; in the 2.x era, it was replaced by Lettuce. Lettuce depends on commons-pool2org.springframework.bootspring-boot-starter-data-r

Jun 03, 2023 pm 06:01 PM

JavaredisSpringBoot

How to solve the problem that springboot cannot access the file after reading it into a jar package

Springboot reads the file, but cannot access the latest development after packaging it into a jar package. There is a situation where springboot cannot read the file after packaging it into a jar package. The reason is that after packaging, the virtual path of the file is invalid and can only be accessed through the stream. Read. The file is under resources publicvoidtest(){Listnames=newArrayList();InputStreamReaderread=null;try{ClassPathResourceresource=newClassPathResource("name.txt");Input

Jun 03, 2023 pm 04:38 PM

SpringBoot

What are the two methods of springboot hot deployment?

The difference between springboot and springmvc: springboot has embedded tomcat, Jetty and Undertow containers, which can be run directly without deployment; springboot automatically configures, reducing a large number of configurations of xml files; reducing the complexity of project construction. SpringMVC is based on Servlet The MVC framework mainly solves the problems of WEB development, because Spring's configuration is very complex, and various XML, JavaConfig, and hin are cumbersome to process. Therefore, in order to simplify the use of developers, Springboot was creatively launched. Conventions are better than configurations, which simplifies the use of spring.

Jun 03, 2023 am 11:51 AM

SpringBoot

How to package and publish SpringBoot applications

1. Create a project (example-fast) Create a WEB project example-fast based on SpringBoot. 2. Compilation and packaging 2.1 uses the IDEA integrated Maven environment to compile and package the SpringBoot project, which is super easy2.2mvn command packaging #mvnclean clean compilation #install packaging #-Dmaven.test.skip=true skip unit test #-Pdev specified dev configuration mvncleaninstall-Dmaven.test.skip=true-Pdev3. Apply the evolution of release 3.1 one-line command to run SpringBo

Jun 03, 2023 am 11:13 AM

SpringBoot

How to build SpringBoot+MyBatisPlus rapid development scaffolding

Let’s talk about the mall-tiny project. Some friends may not understand this scaffolding yet. Let’s talk about it first! Project Introduction mall-tiny is a rapid development scaffolding based on SpringBoot+MyBatis-Plus. It currently has 1100+Stars on Github. It has complete permission management functions, supports using the MyBatis-Plus code generator to generate code, and can be connected to the Vue front-end of the mall project, ready to use out of the box. Project Demonstration The mall-tiny project can be seamlessly connected to the mall-admin-web front-end project, and the front-end and back-end separation scaffolding can be transformed in seconds. Since the mall-tiny project only implements basic permission management functions, the front-end

Jun 03, 2023 am 09:28 AM

SpringBootmybatisplus

How Spring Boot integrates Kafka

Step 1: Add dependencies Add the following dependencies in pom.xml: org.springframework.kafkaspring-kafka2.8.0 Step 2: Configure Kafka Add the following configuration in the application.yml file: sping:kafka:bootstrap-servers:localhost: 9092consumer:group-id:my-groupauto-offset-reset:earliestproducer:value-serializer:org.apache.kafka.common

Jun 02, 2023 pm 02:18 PM

SpringBootkafka

How Java uses Lettuce client to execute commands in Redis master-slave mode

1The concept of redis master-slave replication In a multi-machine environment, a redis service receives write commands. When its own data and status change, it copies them to one or more redis. This mode is called master-slave replication. In redis, use the command salveof to let the redis executing the command copy the data and status of another redis. We call the main server master and the slave server slave. Master-slave replication ensures that data will be replicated when the network is abnormal and disconnected. When the network is normal, the master will keep the slave updated by sending commands. The updates include client writes, key expiration or eviction and other network abnormalities. The master is connected to the slave.

May 31, 2023 pm 09:05 PM

Javaredislettuce

SpringBoot+Redis Bloom filter prevents malicious traffic from penetrating the cache

The details are as follows: What is malicious traffic penetration? Assume that our Redis contains a set of user's registered emails, with email as the key, and it corresponds to some fields of the User table in the DB. Generally speaking, when a reasonable request comes in, we will first determine whether the user is a member in Redis, because reading data from the cache returns quickly. If this member does not exist in the cache, then we will query it in the DB. Now imagine that there are tens of millions of requests from different IPs (don’t think there are none, we encountered them in 2018 and 2019, because the cost of attack is very low) to access your website with a key that does not exist in Redis. Let's imagine this: the request arrives at the web server

May 30, 2023 am 08:16 AM

redisSpringBoot

How to implement springboot integrated redis sentinel master-slave

1. Environment springboot2.3.12.RELEASEJDK1.8IntelliJIDEA development tool Redis sentinel master-slave construction 2. POM file pom file Others are ignored, only the dependencies related to redis are displayed org.springframework.bootspring-boot-starterorg.springframework.bootspring-boot- starter-weborg.springframework.bootspring-boot-starter-data-redisorg.apache.c

May 28, 2023 pm 04:07 PM

redisSpringBoot