Programmer Think

jdk1.5 start supporting annotations, spring 2 5 start comprehensive direct annotation Preparation: inject attributes by annotation 1. Introduce the context file header into the spring configuration file <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.o ...

preface Python: what? Writing crawler, you actually use java? you 're right! Today, break the routine and write a simple crawler in java. It is mainly based on java. Some functions need crawlers; It's a little late to change the question now, so I have to bite the bullet (no matter how ridiculous the road I choose, I have to finish o(﹏╥ ...

1.JSP script elements: <%% >, <%!% >, <% =% > Java code can be inserted into JSP files, and the writing of these codes needs to follow certain syntax specifications. There are three main types of JSP script elements: JSP Scriptlets: Java code block, such as <% java code (variables, methods, expressions, etc.)% >. I ...

3. Basic operation of java process 3.1. Create process Method 1: directly use Thread // The parameter of the constructor is to assign a name to the thread. It is recommended to give a name to the thread (setName() is also acceptable) Thread t1 = new Thread("t1") { @Override // The task to be executed is implemented in the run method publi ...

📋 preface 📋 💝 Blog home page: Red eye Aromatherapy_ CSDN blog - big data, computer theory, MySQL Blogger💝 ✍ This article was originally written by Yu Xia [Hongmu aromatherapy] and was first launched in CSDN ✍ 🤗 Biggest wish in 2022: [serve millions of technical people] 🤗 💝 Initial environment address:[ spark environment construct ...

Use of built-in lock Generally, the java built-in lock we mentioned refers to the lock implemented by the synchronized keyword provided by the JVM. Here is a simple example: public class SynchronizedVariableTest1 { public static void main(String[] args) throws InterruptedException { SynchronizedVariableTest1 test = new Synchroniz ...

This article will review the object-oriented features in java Basic concepts Object oriented organizes code in the form of classes and encapsulates data in the form of objects Three characteristics of object-oriented encapsulation inheritance polymorphism There are objects first and then classes. Objects are concrete things and concrete insta ...

MybatisPlus MyBatis-Plus (opens new window) (MP) is a MyBatis (opens new window) On the basis of MyBatis, the enhancement tool is only enhanced without change. It is born to simplify development and improve efficiency. characteristic No invasion: it is only enhanced without change, and its introduction will not affect the existin ...

10.1 File class java. io. An object of the file class that represents a file or file directory Constructor creates a File instance: File(String filePath)File(String parent, File child)File(File parent, String child) Path separator: windows and DOS systems use "\" by default UNIX and URL s are represented by "/&quo ...

1. Home page implementation 1.1. Access index Because the static files under the template package cannot be accessed directly, they need to be accessed indirectly; View jump is required; Create a new config package in the main program statistics directory to store your own configuration classesCreate your own configuration class MyMvcCon ...