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How to implement monitoring of springboot application service startup events

1. Introduction SpringBoot provides two interfaces: CommandLineRunner and ApplicationRunner, which are used for special processing when starting the application. These codes will be executed before the run() method of SpringApplication is completed. Compared with the Spring's ApplicationListener interface custom listener and Servlet's ServletContextListener listener introduced to you in the previous chapter. The advantage of using both is that you can easily use application startup parameters and perform different initialization operations based on different parameters. 2. Introduction to Common Scenarios to Implement Common

May 16, 2023 pm 11:10 PM

SpringBoot

How to solve the problem that username and password are required to log in to the web page after enabling springboot security

Note on the problem: The SpringBoot2.0.2 I use may not be useful for the 1.5.x series. Direct solution 0, remove the spring-boot-starter-security dependency. If the security function is not actually used, you can directly remove the spring-boot-starter-security dependency 1. Use the default user and password to log in. The default user name is user and the password is A string of strings 2 automatically generated when the program starts. To disable security settings or set the corresponding user and password, you can configure the corresponding user and password in application.properteis or set the corresponding user name and password spri.

May 16, 2023 pm 10:02 PM

webSpringBootsecurity

How to use SpringBoot+Vue+Flowable to simulate the leave approval process

1. Effect display Before the official start, let me first show my friends the effect we are going to complete today. For the sake of simplicity, I did not introduce concepts such as users and roles here. All the places involving users are entered manually. In subsequent articles, I will continue to combine SpringSecurity to show you the situation after introducing users. Let’s take a look at the leave page first: employees can enter their name, number of days of leave, reason for leave, etc. on this page, and then click the button to submit a leave application. When an employee submits a leave application, the leave application will be processed by the manager by default. After the manager logs in, he can see the request submitted by the employee: the manager can choose to approve or reject it at this time. Whether it is approved or rejected, it can be passed

May 16, 2023 pm 07:05 PM

VUESpringBootflowable

How Springboot implements scheduled tasks through Scheduled

Scheduled tasks generally exist in medium and large enterprise-level projects. In order to reduce the pressure on servers and databases, certain business logic is often completed in time periods. The more common ones are push callbacks from financial service systems. Generally, payment system orders will continuously call back when they do not receive successful callback return content. Such callbacks are usually completed by scheduled tasks. There is also the generation of reports. We usually complete this operation when the number of customer visits is too small, which is often in the early morning. At this time, we can also use scheduled tasks to complete the logic. SpringBoot has built-in scheduled tasks for us. We only need an annotation to enable timing for our use. In development, scheduled tasks are a common function. In springbo

May 16, 2023 pm 06:10 PM

SpringBootscheduled

What is the method for SpringBoot to integrate message queue RabbitMQ?

Introduction In the Spring project, you can use Spring-Rabbit to operate RabbitMQ. Especially in the springboot project, you only need to introduce the corresponding amqp starter dependency. It is convenient to use RabbitTemplate to send messages and use annotations to receive messages. Generally during the development process: producer project: application.yml file configures RabbitMQ related information; write configuration classes in the producer project to create switches and queues, bind and inject RabbitTemplate objects, and send messages to the switch through RabbitTemplate objects Consumer Engineering: application.

May 16, 2023 pm 05:25 PM

SpringBootrabbitmq

How to integrate springboot and mybatis

Integrate MyBatis to create a new SpringBoot project, or use Chapter 1 as the basis to introduce dependencies in pom. mysql-connector-java introduces and integrates the core dependency of MyBatis, mybatis-spring-boot-starter. The spring-boot-starter-jdbc dependency is not introduced here because mybatis-spring-boot-sta

May 16, 2023 pm 03:52 PM

SpringBootmybatis

How to use cache in SpringBoot project

Preface Caching can effectively improve system performance and stability by storing frequently accessed data in memory, reducing the pressure on underlying data sources such as databases. I think everyone has used it more or less in their projects, and our project is no exception. However, when I was reviewing the company's code recently, the writing was very stupid and low. The rough writing is as follows: publicUsergetById(Stringid){Useruser=cache. getUser();if(user!=null){returnuser;}//Get user from the database=loadFromDB(id);cahce.put(id,user);returnu

May 16, 2023 pm 02:34 PM

SpringBootcache

How Springboot solves the cross-domain request problem of ajax custom headers

1. What is cross-domain? Because of the browser’s same origin policy (original origin policy), it is a well-known security policy proposed by Netscape. Now all browsers that support JavaScript will use this policy. The so-called same origin refers to domain name, protocol , the port is the same.), any one of the protocol, domain name, and port used to send the request URL is different from the current page address, it is considered cross-domain. For details, you can check the following table: 2. How springboot solves cross-domain problems 1. Common cross-domain request solutions: ①Add the annotation @CrossOrigin(origins="http://127.0.0.1:8020",maxAge=360 to the request interface

May 16, 2023 pm 12:43 PM

SpringBootajaxheaders

SpringCloud-Spring Boot Starter usage test instance analysis

What is SpringBootStarter? SpringBootStarter is a concept proposed in the SpringBoot component, which simplifies many cumbersome configurations. By introducing various SpringBootStarter packages, you can quickly build the scaffolding of a project. For example, some of the ones we often use: spring-boot-starter-web: spring-boot-starter-data-redis: spring-boot-starter-data-mongodb: spring-boot-starter-data-jpa: spring-b

May 16, 2023 am 11:10 AM

SpringBootspringcloudstarter

How to solve SpringBoot global exception problem

SpringBoot is a product that was born to simplify a series of issues such as creating, running, debugging, and deploying Spring applications. The feature of automatic assembly allows us to better focus on the business itself rather than external XML configuration. We only need to follow the specifications and introduce The relevant dependencies can easily build a WEB project. In actual project development, various abnormal situations often occur in the program. Especially as server-side developers, we always keep writing interfaces to provide to the front-end. In the case of calls and division of labor, exceptions cannot be avoided. If the wrong information is directly exposed to the user, the experience can be imagined, and for hackers, detailed exception information often provides great help... Use try-c

May 16, 2023 am 10:49 AM

SpringBoot

How Spring Boot integrates Thymeleaf

Basic introduction to Thymeleaf SpringBoot officially recommends using Thymeleaf as its template engine. SpringBoot provides a series of default configurations for Thymeleaf and provides a view resolver for Thymeleaf. Once Thymeleaf's dependencies are imported into the project, the corresponding automatic configuration (ThymeleafAutoConfiguration) will automatically take effect, so Thymeleaf can be perfectly integrated with SpringBoot. Thymeleaf template engine can be perfectly combined with html tags to facilitate back-end rendering of data. Thymeleaf supports static effects and dynamic effects.

May 16, 2023 am 09:22 AM

SpringBootthymeleaf

How SpringBoot implements file upload and download functions

SpringBoot file upload and download In actual web application development, in order to successfully upload files, the form method must be set to post and the enctype must be set to multipart/form-data. Only with this setting can the browser send the binary data of the selected file to the server. Starting from Servlet 3.0, methods for processing file uploads have been provided, but this file upload needs to be completed in JavaServlet, and SpringMVC provides a simpler encapsulation. SpringMVC implements a MultipartResolv through ApacheCommonsFileUpload technology

May 16, 2023 am 08:46 AM

SpringBoot

What is the method for ssm to transform spring boot project?

If it is a normal Maven project, you need to add dependencies manually. jarorg.springframework.bootspring-boot-starter-parent2.3.3.RELEASEorg.springframework.bootspring-boot-starter-weborg.springframework.bootspring-boot-starter-testtestorg.projectlomboklombokprovided Add startup class If it is a normal Maven project, you need to add it manually. @Spri

May 16, 2023 am 08:28 AM

SpringBootssm

How to Analyze Code Auditing in Java Web Security

1. JavaWeb Security Basics 1. What is code auditing? In layman’s terms, Java code auditing is to discover security issues in the Java application itself by auditing Java code. Since Java itself is a compiled language, even if there are only class files We can still audit Java code. For uncompiled Java source code files, we can read the source code directly, but for compiled class or jar files, we need to decompile them. Java code auditing itself is not very difficult. As long as you are proficient in the auditing process and common vulnerability auditing techniques, you can complete the code auditing work relatively easily. But the way of Java code auditing is not just to use

May 16, 2023 am 08:04 AM

javaweb