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Java tutorial

Learn JAVA variable parameters from scratch

The following is a simple small program: copy the code as follows: import java.util.Arrays; class lesson6 {public static void main(String[] args) {int array[]={2,3,1,5

2025-01-15
JavaEE implements request redirection through response

Request redirection means that after a web resource receives a client request, it notifies the client to access another web resource. This is called request redirection. The 302 status code and location header can be used to implement redirection. The mos

2025-01-15
Summary about ServletConfig in JavaEE

In the Servlet configuration file, you can use one or more<init-param> The tag configures some initialization parameters for the servlet. When the servlet is configured with initialization parameters, the web container will automatically encapsulate these

2025-01-15
JavaEE implementation file download

Let’s first look at the simplest example of file downloading: copy the code as follows: package com.yyz.response;import java.io.FileInputStream;import java.io.IOException;import ja

2025-01-15
Analysis on the problem of using response to output garbled Chinese data to the client in JavaEE

When the web server receives the client's http request, it will create a request object representing the request and a response object representing the response for each request. Since the request and response objects represent requests and responses,

2025-01-15
Java background calls the HttpURLConnection class to simulate browser request instances (can be used for interface calls)

Generally, it is inevitable to encounter calls to external interfaces during project development. This article describes the method of calling the HttpURLConnection class in the java background to simulate browser requests. Can be used for interface calls

2025-01-15
Summary of the Chinese garbled problem of submitting data in form in java using post and get methods

1: The form submits data in the foreground in post mode: When the browser sends the data (assumed to be "China") to the server, it must look up the code table when turning the data into binary data of 0101 (assumed to be 98 99). Which code table

2025-01-15
Summary of common request methods in java

The HttpServletRequest object represents the client's request. When the client accesses the server through the HTTP protocol, all the information in the HTTP request header is encapsulated in this object. Developers can obtain the client's informa

2025-01-15
Shiro configuration method based on Spring framework

1. Add shiro filter in web.xml<filter><filter-name> shiroFilter</filter-name><filter-class> org.springframewor

2025-01-15
Example of join method of Java Thread

This article describes the join method of Thread in Java. Share it with everyone for your reference. The specific implementation method is as follows: join public final void join() throws InterruptedException and wait for the thread to terminate. Throws:

2025-01-15
Analysis of the differences between several jar packages when connecting to sqlserver database using Java

I saw someone asking this question in the group today, so let me share my knowledge with you. Of course, there may be something wrong. I hope to point out: ***msbase.jar, mssqlserver.jar , msutil.jar (supports sql2000): early connection database J

2025-01-15
Teach you to build your first Java Applet program

Introduction Note: Before you start this tutorial, you must download and install the Java SE Development Kit. Java applets are like Java applications. They are created by following the same three steps - write, compile and run.

2025-01-15
How to avoid null pointer exception in Java

No one likes NullPointerException! Is there any way to avoid them? Maybe. . This article will discuss the following technologies 1. Optional type (newly introduced in Java 8) 2. Objects class (original in Java 7) What is the Optional class in Java 8? 1.Ne

2025-01-15
Use cases of toolbar (JToolBar) and split panel (JSplitPane) components in Java Swing

1: Toolbar (JToolBar) code example: Copy the code as follows: import javax.swing.*;//Toolbar use case public class JToolBarDemo2_jigloo extends javax.swing.JFrame

2025-01-15
Use cases of drop-down menu (menu), pop-up menu (JPopupMenu), and tabbed form (JTabbedPane) components in Java Swing

The menu is the most commonly used component in the GUI. The menu is not a subclass of the Component class. It cannot be placed in an ordinary container and is not constrained by the layout manager. It can only be placed in the menu bar. The menu componen

2025-01-15

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