Tag：java
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Time：2021-5-8
This article mainly introduces the implementation principle of Java background to prevent the client from repeating requests and submitting forms. The example code is introduced in great detail, which has a certain reference learning value for everyone’s study or work. If you need a friend, you can refer to it preface In the web / […]
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Time：2021-5-1
This paper introduces the new method of Java 9 optional API. In addition to modularity, Java 9 also adds three methods to the optional class. 1. Or method Sometimes when optional is empty, we want to execute some other logic and return optional as well. Before java9, the optional class had only orelse() and orelseget() […]
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Time：2021-4-30
This article mainly introduces the Java multithreading concurrent programming and lock principle analysis, the article through the example code introduction is very detailed, for everyone’s study or work has a certain reference learning value, need friends can refer to 1、 Preface Recently, the project has encountered the situation of multithreading concurrency (concurrent order grabbing & […]
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Time：2021-4-30
Java singleton mode A single example of starving Han style For the hungry man pattern, we can understand it as follows: the singleton class is very hungry and needs to eat urgently, so it creates an object immediately when the class is loaded. Lazy singleton class For the lazy mode, we can understand it as […]
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Time：2021-4-29
This article mainly introduces the atomic principle of Java Memory Model and example analysis. The example code introduced in this article is very detailed, which has a certain reference learning value for everyone’s study or work. Friends in need can refer to it In this paper, we will talk about how JMM ensures the atomicity […]
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Time：2021-4-28
This article mainly introduces the caching mechanism principle of Java wrapper class, and explains the examples in detail. Through the example code, this article introduces it in great detail, which has a certain reference learning value for everyone’s study or work. Friends who need it can refer to it The caching mechanism of Java wrapper […]
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Time：2021-4-26
This article mainly introduces the Java new process of an object instance analysis, the article through the example code is very detailed, for everyone’s study or work has a certain reference learning value, need friends can refer to When Java is creating an object, it will first check whether the class to which the object […]
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Time：2021-4-24
Application scenarios: The code can realize the monitoring after the file changes, such as the file changes, automatically reload the file content, and realize the hot deployment of the configuration file. code: package com.yx.demo.filemonitor; import java.io.File; import java.lang.ref.WeakReference; import java.util.ArrayList; import java.util.Collection; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Timer; import java.util.TimerTask; /** * FileMonitor […]
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Time：2021-4-22
This article mainly introduces the Java implementation of two-dimensional code generation plus background code examples, this article through the example code is very detailed, for everyone’s study or work has a certain reference learning value, need friends can refer to pom.xml rely on <! — QR code generation — > <!– https://mvnrepository.com/artifact/com.google.zxing/core –> <dependency> <groupId>com.google.zxing</groupId> […]
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Time：2021-4-22
At present, only the fixed UUID generated by Java is implemented: 85bb94b8-fd4b-4e1c-8f49-3cedd49d8f28 package main import ( “encoding/binary” “encoding/json” “fmt” “log” “os” “strings” “time” “github.com/Shopify/sarama” “github.com/google/uuid” ) const ( DATE_TIME_PATTERN = “” STREAM_MAGIC = 0xaced STREAM_VERSION = 5 TC_STRING = 0x74 TC_OBJECT = 0x73 TC_CLASSDESC = 0x72 SC_SERIALIZABLE = 0x02 TC_ENDBLOCKDATA = 0x78 TC_NULL = 0x70 […]
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Time：2021-4-21
1、 Verification code Captcha is essentially a picture, and the content of the picture will be generated randomly with the running of the program The role of verification code: to prevent applications from sending malicious data, to a certain extent, to avoid the attack of malicious programs on the website.Captcha is essentially a picture, the […]
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Time：2021-4-18
This article mainly introduces the java simple data encryption method des implementation process analysis, this article through the example code introduction is very detailed, for everyone’s study or work has a certain reference learning value, need friends can refer to 1. When the data is transmitted in the network, it needs to be encrypted The […]
