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Java tutorial
  • Java uses JavaMail to send emails to QQ mailboxes

    Java uses JavaMail to send emails to QQ mailboxes

    Recently, the project is working as a news crawler. I want to implement this function: after a crawler fails to send the url of this page to the email address. The final effect diagram is as follows. Filter tags, failure status codes, etc. can be added la
    2025-09-01
  • IntelliJ Idea 2017 registration code free activation method

    IntelliJ Idea 2017 registration code free activation method

    IDEA is the full name IntelliJ IDEA. It is an integrated environment for Java language development. IntelliJ is recognized as one of the best Java development tools in the industry, especially in intelligent code assistants, automatic code prompts, refact
    2025-09-01
  • Parsing html in Java code and obtaining the value method

    Parsing html in Java code and obtaining the value method

    Sometimes we get the page and need to parse it in Java code to get the data in html. Jsoup is a very convenient tool. 1. What is Jsoup? Official website: http://jsoup.org/ You can download the corresponding jar on the official website. Commonly use Jsoup
    2025-09-01
  • Java implements simple expression calculator function example

    Java implements simple expression calculator function example

    This article describes the Java implementation of simple expression calculator functions. I will share it with you for your reference. The details are as follows: Read a non-negative integer calculation expression that only contains +, -, *, / and calcula
    2025-09-01
  • A brief discussion on the implementation of a simple microservice architecture in SpringCloud

    A brief discussion on the implementation of a simple microservice architecture in SpringCloud

    Spring Cloud is an ordered collection of a series of frameworks. It uses the development convenience of Spring Boot to cleverly simplify the development of distributed system infrastructure, such as service discovery registration, configuration center, me
    2025-09-01
  • Log4j Implementation method for configuring log printing time zone

    Log4j Implementation method for configuring log printing time zone

    og4j version: 2.8.1 encountered a problem when developing desktop programs. The log time in idea and the log time in CMD are normal. After running the exe shaped by exe4j, the log time is 8 hours less, and the time zone becomes wrong. I searched online an
    2025-09-01
  • Vert-x-Connect SQL using JDBC asynchronously

    Vert-x-Connect SQL using JDBC asynchronously

    In this article, we will see how to use HSQL in vert.x applications, of course, you can also use any JDBC, and use the asynchronous API provided by vertx-jdbc-client. The code of this article is on github. asynchronous? A very important feature of vert.x
    2025-09-01
  • An example analysis of dynamic proxy mode of Java design pattern

    An example analysis of dynamic proxy mode of Java design pattern

    This article describes the dynamic proxy mode of Java design pattern. I will share it with you for your reference. The details are as follows: The static proxy mode was introduced earlier, and dynamic proxy is more powerful than the static proxy mode. It
    2025-09-01
  • springmvc examples of passing and receiving array parameters

    springmvc examples of passing and receiving array parameters

    How to pass arrays in java url, how to receive array parameters in springMVC framework controller class? The following is a method of passing array parameters in the URL: dd.dotitles[]=col1&titles[]=col2&titles[]=col3 or use ajax
    2025-09-01
  • Based on two types of jersey file upload methods in Java

    Based on two types of jersey file upload methods in Java

    This article will lead you to use Jersey based on JAX-RS REST style implementation to upload files to the folders formulated by the server. If it is a picture and read it to display the picture. Preparation: prepare a form form with two fields, one is typ
    2025-09-01
  • 10 classic Java main method interview questions

    10 classic Java main method interview questions

    Share with everyone, please point out any errors. 1. How to define a class without using the main method? No, we cannot run Java classes without the main method. Prior to Java 7, you could run Java classes by using static initialization. However, it won&#
    2025-09-01
  • Detailed explanation of how to compare array judging elements in Java

    Detailed explanation of how to compare array judging elements in Java

    1. Convert the array to List and then use the contains in List to determine whether it exists public static boolean useList(String[] arr,String containsValue){ return Ar
    2025-09-01
  • Java version of rose program code for confessing love to your lover

    Java version of rose program code for confessing love to your lover

    1. The frame (gradual entry function) of writing the confession statement package com.wanju.blessing; import java.awt.Color; import java.awt.Container; import java.awt.Dimens
    2025-09-01
  • Java implements employee management system

    Java implements employee management system

    The examples in this article share the specific code of Java implementing employee management system for your reference. The specific content is as follows: 1. Process control statements 2, Classes, Objects 3, Encapsulation, Inheritance, Polymorphism 4, M
    2025-09-01
  • Based on the principle of red and black tree insertion and Java implementation method (share)

    Based on the principle of red and black tree insertion and Java implementation method (share)

    A red and black tree is a binary balanced lookup tree. Each node has a storage bit to represent the color of the node, which can be RED or BLACK. The red-black tree has the following properties: (1) Each node is red or black (2) The root node is black (3)
    2025-09-01
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