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1, MVC framework (model view controller) 1.1MVC concept MVC, also known as programming mode, is a software design idea, which divides data operation, page display and business logic into three levels (modules), which are completed independently and called each other Model layer View Controller 1.2MVC mode details MVC is not unique ...

Media Type When uploading files, you need to specify the media type. There are the following two types. multipart/form-data In HTML, the enctype attribute in the form specifies how the form data should be encoded before being sent to the server. By default, the form data is encoded as "application/x-www-form-urlencoded". That is, ...

asdsServlet is an extension branch written in Java language that is applied to the Web server side. It precedes JSP and handles HTTP requests in Web applications conveniently. In the development of Java Web programs, Servlet is mainly applied to a variety of business logic, it has more business logic layer meaning than JSP, and Servlet securit ...

1, Single case model (1) Definition Singleton model: a pattern in which a class has only one instance and the class can create the instance itself. Singleton model and factory pattern based on java (2) Implementation mode Common implementation methods include lazy mode, hungry mode, double check lock, static internal class, enumeration ...

SpringMVC Chapter I overview of SprngMVC 1.1 basic description of spring MVC springmvc is based on spring and is a module in spring. It is used for web development. springmvc is called spring web mvc, which shows that it is the core technology of spring. For web development, springmvc is the internal mvc architecture mode Spring MVC is ...

Spring assembles beans based on annotations Since JDK 5.0, Java has provided Annotation Spring does not use annotations to assemble beans by default, so you need to add context: annotation config / in the configuration file to enable annotations. Common annotations in Spring are as follows @Component This annotation can be used to describe ...

Three components of Java Web. They are: Servlet program, Listener listener and Filter filter 1, Listener listener Listener listener, which is one of the three major components of Java Web. The three major components of Java Web are Servlet program, Filter filter and listener listener.Listener, which is the specification of Java EE, is the int ...

Madness theory 1. Review MVC 1.1 what is MVC MVC is the abbreviation of model, view and controller. It is a software design specification.It is a method to organize code by separating business logic, data and display.The main function of MVC is to reduce the two-way coupling between view and business logic.MVC is not a design pattern, MVC ...

Spring MVC file upload and download File upload and download are frequently used functions in Web projects. Spring MVC can well support file upload and download; This section creates a new SpringMVC-09-File project. Learn to upload and download files in SpringMVC. 1. File upload 1.1 pre knowledge File upload is to transfer data from the cli ...

1. Integration of spring and Web Environment 1.1 ApplicationContext application context acquisition method The application context object is obtained through the new ClasspathXmlApplicationContext(spring configuration file), but each time a Bean is obtained from the container, the new ClasspathXmlApplicationContext(spring configuration file) ...