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1. Concept The so-called dependency injection (DI) actually means that when a bean instance references another bean instance, the spring container helps us create a dependent bean instance and inject (pass) it into another bean. Dependency: the creation of a Bean object depends on the container, and the Bean object depends on resourcesInj ...

Video link: https://www.bilibili.com/video/BV1VP4y1c7j7?p=48&spm_id_from=pageDriver preparation (1) New maven project See the following steps for details: https://editor.csdn.net/md/?articleId=123185097 (2) Create two forms in sql: t_emp,t_dept t_dept form: t_emp form: Add a did to connect with the primary key of the ...

Configuring and using servlets in IDEA Crazy God says Java 1. Introduction to Servlet Servlet is a technology for sun company to develop dynamic websun provides an interface called Servlet in these API s. If you want to develop a Servlet program, you only need two steps: Write a class to implement the Servlet interfaceDeploy the deve ...

Non plug-in, pure code implementation This is the effect diagram of code implementation:   First, if the normal pagination is written for the first time, you can modify it on this basis after all the tables are written. Parameters to be added: start from the first few, query several pieces of data, pageSize (self determined), to ...

Log4j log: What is Log4j? log4j is a common logging framework, which is used to record the execution process or exceptions of the application. It is recorded in the log file. The operation and exception information of the application can be known through the log file. Why log? We know that the program will produce a lot of information during ...

Hello, I'm glacier~~ This article is pure dry goods. It deeply analyzes the Callable interface from the perspective of source code. I hope you can step down, open your IDE, and follow the article to see the source code. I believe you will gain a lot. 1. Introduction to callable interface The Callable interface is jdk1 5 new generic interface ...

Ioc overview Ioc(Inversion Of Control) is translated as control inversion First, make it clear that the control without inversion is "active control" Active control: all the codes we wrote before are active control, which means that we can instantiate whatever objects are needed during the running of the programInversion of control ...

Mybatis annotation development single table operation 1. Common notes of mybatis In recent years, annotation development has become more and more popular. Mybatis can also use annotation development, which can be used to reduce the writing of Mapper Mapping file. @Insert: add @Update: implement update @Delete: delete @Select: implement q ...

[Java] multithreading (taking the realization of video function as an example) step1: how to realize video Video is realized by pictures, so we only do two things: 1) Find an interface that can call the camera 2) Use this interface to get the picture of every moment 3) Draw these pictures in a continuous cycle Step 2: why can't you turn ...

install Lombok installation is divided into two parts: the installation of Idea plug-in and the import of pom file in maven. Installation of Idea plug-in Click settings, select plug-ins, search Lombok (Networking required) in the plug-in configuration of Idea or download local installation on the official website, and click initialize in ...