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Original address: http://www.yiidian.com/springmvc/file-upload.html File upload is a common requirement in the presentation layer. In Spring MVC, the common file upload tool of Apache is used to complete file upload and encapsulate it, making it more convenient for developers to use. Let's see how to develop it? 1 import common file upload pack ...

3, Bean instantiation public void refresh() throws BeansException, IllegalStateException { synchronized (this.startupShutdownMonitor) { // Prepare this context for refreshing. prepareRefresh(); // Tell the subclass to refresh the internal bean factory. ConfigurableListableBeanFac ...

1. introduction Spring Boot is a framework to simplify spring development. It is used to monitor the spring application development. The Convention is larger than the configuration. just run can create an independent, product level application. When we use Spring boot, we only need to configure the corresponding Spring boot to use all the Sprin ...

In microservices, global exception handling is an objective problem that must be solved. If these exceptions are not handled well, some unfriendly error messages will be displayed to users, such as null pointer exceptions, SQL execution errors and other exceptions, which are certainly incomprehensible t ...

Problem Description: as a rookie, in the process of learning spring boot, I want to watch the teacher's video once and knock myself to impress myself a little bit. As a result, the problem comes. @The Reference of the Reference annotation reported a null pointer exception. After more than two hours of t ...

There are two types of beans in Spring, one is a normal bean, the other is a factory bean: Bean factory is a factory used to manage beans. All beans are managed by BeanFactory (i.e. IOC container) FactoryBean is a factory Bean that can produce or decorate objects. Its implementation is similar to the ...

In the distributed system, due to the huge number of services, in order to facilitate the unified management and real-time update of service configuration files, the distributed configuration center components are required. In Spring Cloud, there is a distributed configuration center component, spring c ...

1. Factory Mode 1.1 What is factory mode Separation of creator and caller is implemented, factory mode is divided into simple factory, factory method, abstract factory mode 1.2 Factory Mode Benefits Factory mode is one of our most common instantiated object modes, replacing the new operation with ...

dubbo SPI(Service Provider Interface) In essence, the fully qualified name of the interface implementation class is configured in the file, and the service loader reads the configuration file and loads the implementation class. This allows you to dynamically replace the implementation class for the interface at run time. SPI is used to de ...

It's all notes of personal learning process, not summary, no reference value, but this book is great Basic grammar Definition annotation Annotations usually contain elements that represent specific values. These values can be used by programs or tools when analyzing and processing annotations. Th ...