This article brings you a super sweet Java tool library——Hutool

Hutool

Official website address: https: //www.hutool.cn/

github address: https://github.com/looly/hutool

gitee address: https://github.com/looly/hutool

What is Hutool?

Let’s take a look at the official website author’s explanation:

Hutool is a Java toolkit, and it is just a toolkit. It helps us simplify every line of code and reduce every Method, so that the Java language can also be "sweet". Hutool was originally a compilation of the "util" package in my project. Later, it gradually accumulated and added more non-business-related functions, and extensively studied the essence of other open source projects. After its own organization and modification, it finally formed a rich open source tool set.

Hutool design concept

Hutool’s design idea is to minimize repeated definitions and keep the util package in the project as few as possible. Generally speaking, there are Here are a few ideas:

• Methods take precedence over objects

• Automatic recognition is better than user definition

• Convenience and flexibility coexist

• Adaptation and compatibility

• Optional dependency principle

• No intrusion principle

Why choose Hutool?

There are many open source Java tool libraries currently on the market, some of which are excellent ones like Google Guava, Apache’s commons package, and even many people like to use some tool classes provided within the framework (such as Spring’s BeanUtils). They encapsulate many tool classes that Java programmers need daily, such as FileUtils, StringUtils, ArrayUtils, etc. Hutool, as a super tool set of Java, includes almost all the tool libraries we need for daily development. Let’s take a look. What are they:

##hutool-aopJDK dynamic proxy Encapsulation, providing aspect support under non-IOChutool-bloomFilterBloom filtering, providing bloom filtering of some Hash algorithmshutool-cacheSimple cache implementationhutool-coreCore, including Bean operations, dates, various Utils, etc.hutool-cron Scheduled task module, providing scheduled tasks similar to Crontab expressions

Module	Introduction
hutool-crypto	Encryption and decryption module, providing symmetric, asymmetric and digest algorithm encapsulation
hutool-db	JDBC Encapsulated data operation, based on ActiveRecord idea
hutool-dfa	Multi-keyword search based on DFA model
hutool-extra	Extension module, for third-party packaging (template engine, email, Servlet, QR code, Emoji, FTP, word segmentation, etc.)
hutool-http	Http client encapsulation based on HttpUrlConnection
hutool-log	Log facade for automatic identification of logs
hutool-script	Script execution encapsulation, such as Javascript
hutool-setting	More powerful Setting configuration file and Properties encapsulation
hutool-system	System parameter call encapsulation (JVM information, etc.)
hutool-json	JSON implementation
hutool-captcha	Picture Verification code implementation
hutool-poi	Encapsulation of Excel and Word in POI
hutool-socket	Java-based Socket encapsulation of NIO and AIO

how to use?

• Install via maven:

##

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.3.6</version>
</dependency>

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• Install through Gradle:

compile 'cn.hutool:hutool-all:5.3.6'

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After introducing the project, open the official document, according to Search to find the corresponding tool class according to your needs, and follow the prompts to CV.

For example, if I want to use tools related to Excel operations, I will first search for them:

Find ExcelUtil and click on it. ：

You see, the simple-to-use demo document is clearly written, and you can get started quickly by just copying and pasting.

If this simple example cannot meet your needs, then you can open the Api document and see more detailed operations.

API documentation: https://apidoc.gitee.com/loolly/hutool/

After opening it, it still feels familiar. The operation is over:

##What is the reason for wall crack recommendation?

Let me get the string manipulation tool class

StrUtil

For example:

import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.StrUtil;

public class HutoolTest {
    public static void main(String[] args) {
        // String 操作
        String str = "hello_word";
        System.out.println(StrUtil.isBlank(str));    // 判断字符串是否为空
        System.out.println(StrUtil.toCamelCase(str));   // 字符串“_”转驼峰
        System.out.println(StrUtil.concat(true, str, null, "123"));     //字符串连接
        System.out.println(ArrayUtil.toString(StrUtil.splitToArray(str, '_')));    // 字符串拆分数组，内部帮我们做了判断，所以是安全的
    }
}

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Running result:

Open the class method diagram of StrUtil and take a look. StrUtil provides us with a very comprehensive tool method for String operations. It can be used out of the box, which is very cool.

Download the source code and click in to take a look. The comments are all in Chinese and very detailed. After seeing the comments, we can know roughly what this method does and what precautions are required. This can be said to be very conscientious for beginners.

How about it? Are domestic tools sweet enough? Why don't you hurry up and try this special June 1 gift?

The above is the detailed content of Other children are celebrating Children's Day, so let me recommend a super sweet tool. For more information, please follow other related articles on the PHP Chinese website!