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part error and exception handling mechanism 1, Errors and exceptions Error Exception Error is often something that cannot be handled by the program (an error introduced by the user or a system error) Exception is caused by the programmer and can be handled in the program. try catch / throws Excellent handling mechanism Question: how to deal ...

Spring - configuring bean s based on xml 1, Four methods of Bean instantiation Premise: all classes managed by Spring are required to provide open and parameter free constructs. Tell Spring how to get the object of the class through the Bean tag 1.1 nonparametric construction method (most commonly used in development) First write a po ...

  1. Format update of beans.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd ...

1, Propertyresourceconfigurator class /* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * https://www.apache.org/licenses/LICENSE-2.0 * * Unless ...

The persistence layer framework used before is Mybatis. Now Mybatis framework is integrated into Spring framework and managed by Spring. Its core idea is to store the implementation class objects corresponding to Mapper in IOC container Overall idea: 1. Build the Mybatis framework in the original way 2. Build the Spring framework in the ...

Spring 5 learning notes [!TIP] The notes are summarized from Bili Bili crazy God said spring 5. 1. Introduction 1.1 INTRODUCTION [!NOTE] The Spring framework is due to software development Created by the complexity of. Spring uses a basic JavaBean to do this. Previously, it could only be done by EJB Things done. However, the ...

Note: it is only for Spring projects, not for Spring boot and Spring cloud Project scenario: The project framework is Spring + spring MVC + mybatis. When the project starts, different configuration files are loaded, and then the effect of different environments is achieved. It can be understood that there are four configuration files a.proper ...

1. Interceptor concepts Interceptors in java are objects that dynamically intercept action calls, providing a mechanism for developers to execute a piece of code before and after an action is executed, or within an Action Blocking execution before execution also provides a way to extract reusable parts of code in an Action. In AOP, intercepto ...

1, Foreword For any framework, a series of initialization is required before use, and MyBatis is no exception. 2, What did the initialization of MyBatis do 2.1 the initialization process of mybatis is the process of loading the configuration information required by its own runtime The initialization of any framework is nothing more than ...

proxy pattern The proxy pattern is the bottom layer of spring AOPAgent mode classification: static agent and dynamic agent 1. Static proxy Role analysis Abstract role: it is usually solved by using interfaces or abstract classes Real role: the role represented Proxy role: represents a real role. After representing a real role, there will be ...