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Guide reading 1. Basic knowledge of network operation 2. Basic knowledge of JSON 3. Request data and analysis from the server Basic knowledge of network operation Basic knowledge of JSON A bracket represents a collection, and a curly bracket represents an object Request data from server and parse JSON me ...

A few days ago, I went to the property management office to pay the property fee. The property management staff said that the community introduced high-tech products. After using the bank card for consumption, I didn't need to sign on the UnionPay machine with a pen. I directly touched with my finger to sign the consumption. At that time, I tho ...

Beginners are most likely to be confused by the code when they first touch the code, so they should give the minimum generation of core code for beginners, first make clear the core code, and then expand the knowledge, so that the learning effect will be better. There are a lot of codes on the Internet, which make begi ...

Method 1: use the system control ViewFlipper mode: Layout file: <ViewFlipper android:id="@+id/view_flipper" android:layout_width="300dp" android:layout_height="35dp" android:layout_centerInParent="true" android:autoStart="true" android:background="@drawable/warning_bg" android: ...

Preface I believe that we will find that many web pages have such functions in our life. One second ago, we were still on the web page, and one second later, we inexplicably entered their APP. So how does this effect work? After careful study, I found that android:scheme attribute is used to complete the function. Here's my personal opinion. ...

Need to write mapper interface (equivalent to dao interface) mapper.xml mapping file needs to be written mybatis can automatically generate proxy objects of mapper interface implementation classes Development specification 1. namespace in mapper.xml is equal to the address of mapper interface 2. The method name in the mapper.java interfac ...

The project needs to realize the function of picture viewing. Using ImageView can't scale, using the system's picture viewer can't meet their own customized needs, so I used Viewpager + PhotoView to realize it. Introducing PhotoView Github link for PhotoView , PhotoView is designed to help developers easily scale Android ImageView. 1. Conf ...

Servlet3 has been released for several years. How many people know its new features? Here is a brief introduction. The following features are mainly added: 1. Asynchronous processing support 2. Pluggability support 3. Annotation support, zero configuration, no need to configure web.xml ... What the hell is asynchronous processing? Operate the k ...

1. Need to import the jar package of PageHelper If maven is not used, just import the jar package into the lib folder. The PageHelper plug-in has open source on github, Address: https://github.com/pagehelper/Mybatis-PageHelper/tree/master/src/main/java/com/github/pagehelper.   If maven is used, the plug-in can be introduced in pom.xml as fol ...

monitor Catalog OnlineCountListener.java package com.huangdekai.JavaWeb.listener; import javax.servlet.ServletContext; import javax.servlet.http.HttpSessionEvent; import javax.servlet.http.HttpSessionListener; /** * @Autord: HuangDekai * @Date: 2020/4/28 22:41 * @Version: 1.0 * @since: jdk11 */ public class OnlineCountListener imple ...