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Spring IOC and Factory Mode PS: The content of this article is hard core, which requires a better understanding of java's object-oriented, reflection, class loader, generics, properties, XML and other basic knowledge. (1) Brief introduction Before talking about Spring IOC, it's necessary to talk about Factory Pattern.Factory mode separates the ...

1. Introduction In JDK, java.net.URL is applicable to the classes that load resources, but the implementation classes of URL access network resources, and there is no way to obtain files and ServletContext from class path or relative path, Although the new handler can be implemented by customizing the extended URL interface, it is very complex. ...

1, Add node Operating system configuration: ① host name, network, firewall, ssh configuration ssh-keygen -t rsa At the same time, the auth*-keys file of ssh of any node in the cluster can be distributed to the latest node Add the domain name mapping of this node in the / etc/hosts file of all nodes Copy the configuration file of namenode to ...

Popular understanding of spring source code (5) -- parsing and registering bean definitions Last section talked about how to get document. After converting the document to document, the next extraction and registration bean is our play. protected int doLoadBeanDefinitions(InputSource inputSource, Resource resource) throws Bea ...

The framework is to leave the complex to itself, the simple to coden, as simple as writing hello world When developing Spring AOP programs in the early years, aop was configured with xml files (now xml is not popular, annotation @ EnableAspectJAutoProxy is popular), and then framework parsing, For example: How is this configuration resolved, ...

Spring's JDBC module is responsible for database resource management and error handling, which greatly simplifies the operation of the database by the developers, so that the developers can get rid of the tedious database operation, so as to put more energy into writing business logic. For the Spring framework of database operation, the JdbcTem ...

Response object Function: set response message Set response line Format: HTTP/1.1 200 ok Set status code: setStatus (int sc) Set response header: setHeader (String name, String value) Set response body Use steps Get output stream Character output: PrintWrite getWriter() Byte output stream: ServletOutputStream getoutputstream() Output ...

tyboot Source code: https://gitee.com/magintursh/tyboot https://github.com/magintursh/tyboot If you like, you can give a star for more people to see. introduce tyboot is a springboot-based service-side scaffold for the rapid development of single services. You need a micro-service solution to see another project, tycloud (still under improveme ...

In the project, you may encounter the need to modify the button at the bottom right corner of the soft keyboard. Although you have written it several times, you still feel relieved to concentrate on taking notes here. Effect : Note (key points): Xml medium 1. Confirm the function display keyboard in the lower rig ...

Queries are often used to < if > < choose > < when > < otherwise > < trim > tags, and they all support ognl expressions --|The < if > condition judgment is the same as if in Java, such as <if test="id!=null and id!=''"> --|< choose > is just like Java's switch with break, which is used with < ...