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step 1, page <select name="province" id="p"> <option>===Please select a province===</option> </select> <select name="city" id="c"> <option>===Please select a city===</option> </select> 2,ProvinceServlet *Request this Servlet as soon as the page ...

Reference resources: SpringBoot Integration AOP AOP AOP is the abbreviation of Aspect Oriented Programming, which means: facet-oriented programming, a technology for unified maintenance of program functions through precompilation and run-time dynamic agents.With AOP, individual parts of business logic ...

1. Origin of the Rule Engine One day the operation wants to develop a credit strategy to calculate the extra credit amount according to the following rules: The original price of the order is less than 100 without additional points. 100-500 plus 100 points; 500-1000 plus 500 points; 1000 plus 1000 ...

I'm new to Web applications and servlets, and I have the following questions: Whenever I print something in the Servlet and the web browser calls it, it returns a new page containing that text. Is there a way to print text on the current page using Ajax? #1 building I'll show you the entire example of a servlet and the way ajax calls ...

1. The cause of circular dependency - injected through the constructor Let's define two interdependent bean s (injected through the constructor): @Component public class CircularDependencyA { private CircularDependencyB circB; @Autowired public CircularDependencyA(CircularDependencyB circ ...

What is Nacos Nacos is one of the important components in Spring Cloud Alibaba ecosystem, which is used to discover, configure and manage microservices. Nacos provides a set of simple and easy-to-use feature sets, which can quickly realize dynamic service discovery, service configuration, service meta ...

1. Overview Currently, DataBindings have three ways of customizing attributes.Namely: 1. xml introduces custom attribute labels.The code completes the binding with the @BindingAdapter annotation 2. Use directly in your code: @BindingMethods comment to introduce custom attributes and @BindingAdapter c ...

Background and objectives To develop a new project, we need to build a new project. We often copy and paste configuration from other existing projects. It is inevitable that we will step into a hole because of some detailed configuration. Especially for new employees, when they don't know the compan ...

The SpringCloud backend intercepts front-end requests, which are logging, using SpringAOP, which is face-to-face. First, intercept the request address (ip), using the Handler Interceptor Adapter, which intercepts the request address, so it is appropriate to do some validation and preprocessing for the request address. For example, below, I use ...

Servlet overview A servlet is a small Java program (that is, a server-side applet) running in a Web server. Servlets typically receive and respond to requests from Web clients over HTTP (Hypertext Transfer Protocol). Preparation process: 1. Write a java class to implement the servlet interface 2. Mod ...