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preface: The Spring container creates a bean object. Generally, it finds the class to be instantiated by looking up the class attribute value of the bean element through the reflection mechanism, so as to instantiate the bean object. This is to call the constructor to instantiate the bean object In some cases, a simple xml configuration file ...

JDBCTemplate JDBC template (concept and preparation) What is a JdbcTemplate The Spring framework encapsulates JDBC and uses JdbcTemplate to facilitate database operation preparation Introduce related jar packages [the external chain image transfer fails. The source station may have an anti-theft chain mechanism. It is recommended to ...

Spring transaction management 1. Business What is a transaction A set of operations either succeeded or failed Characteristics of transactions ACID Atomicity, a group of operations is a whole, either all successful or all failed, and cannot be separatedConsistency: the data is consistent before and after the transactionIsolation: multipl ...

         In our daily work, we often encounter the need to implement the functions of operation log, login log, error log, etc. the young partners who have just joined the company do not know what to do, or the first idea is to write a method to add to the log table in each method in the business code, bu ...

1. Spring5 1.1 Introduction Spring - > brings spring to the software industry!The Spring framework is redesigned based on interface21!Spring concept: Making existing technology easier to use is a hodgepot that integrates existing technology frameworks!Spring is a lightweight framework for IoC and AOP containers. A framework for providing b ...

1. Complete commodity classification business 1.1 page JS analysis Life cycle function //Define initialization function created() { //Get commodity classification list data by default this.findItemCatList() }, Get data function description async findItemCatList() { const { data: result } = a ...

Online problem handling - feign call error Business scenario: Service 1 invokes service 2 through Feign. In the test phase, everything is normal and there is data loss online (to avoid simple reproduction of sensitive local). Errors are reported as follows: 2021-12-04 13:47:47.774 DEBUG 29480 --- [io-10011-exec-1] .w.s.m.m.a.ServletInvocableH ...

2. First MVC program Hello，SpringMVC 2.1 configuration version 1. Create a new Moudle, springmvc-02-hello, and add web support! 2. Confirm that the dependency of spring MVC is imported! 3. Configure web.xml and register dispatcher Servlet <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" ...

Catalog view resolver Exception Handler Interceptor File Upload JSON data interaction RESTful support view resolver         View Parser: Add the page path section to the configuration file                    No View Parser return "/WEB-INF/show01.jsp";         With ...

catalogue MyBatis environment initialization summary Create project module Add project dependency Mybatis simple configuration implementation. Create project startup class Environment test code implementation Announcement data layer MyBatis practice Business description Pojo class design Dao interface and method Implementation and a ...