Unlock the Hutool magic box: a magical tool set that Java developers cannot miss

: Just work hard and leave the rest to time

: Xiaopozhan

Unlock the Hutool magic box: a magical tool set that Java developers cannot miss

• Preface
• First: String processing
• • 1. Pinyin conversion
  • 2. Regular expression matching
  • 3. Unicode transcoding
• Second: date operation
• • 1. Date formatting
  • 2. Calculate date difference
  • 3. Get date range
• Third: Network request
• • 1. Send a GET request
  • 2. Send a POST request
  • 3. Set request headers and parameters
• Fourth: File operations
• • • 1. File reading and writing
    • 2. File copy
    • 3. File compression and decompression
• Fifth: Other practical tools
• • 1. Encryption and decryption tools
  • 2. Bean operation tools
  • 3. Image processing tools

Foreword

In daily Java development, we often encounter various trivial tasks, from string processing to file operations to complex network requests, each of which requires a lot of time to write and debug code. The emergence of Hutool is like a convenient toolkit for developers, allowing us to deal with these tasks more easily and focus more on the implementation of business logic. Direct access from the official website

First: String processing

Hutool provides a wealth of string processing tools, including pinyin conversion, regular expression matching, Unicode transcoding and other functions. We’ll take a deep dive into these features and demonstrate how to apply them in real projects.

There are indeed many powerful tools available when it comes to string processing with Hutool. Below are some common string processing functions and their brief descriptions.

1. Pinyin conversion

import cn.hutool.core.util.PinyinUtil;

public class PinyinExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        String chineseText = "Hello, world!";
        
        // Convert Chinese to Pinyin
        String pinyin = PinyinUtil.getPinyin(chineseText);
        System.out.println("Pinyin: " + pinyin);
        
        // Get the first letter of Pinyin
        String initials = PinyinUtil.getFirstLetter(chineseText);
        System.out.println("Initial letter: " + initials);
    }
}

2. Regular expression matching

import cn.hutool.core.util.ReUtil;

public class RegexExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        String content = "Hutool is a Swiss Army knife for Java developers.";

        //regular expression matching
        String regex = "\b[a-zA-Z] + \b";
        String result = ReUtil.findAll(content, regex, 0).toString();
        System.out.println("Matching result: " + result);
    }
}

3. Unicode transcoding

import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.UnicodeUtil;

public class UnicodeExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        String original = "Hello, hello!";

        //Convert string to Unicode
        String unicodeStr = UnicodeUtil.toUnicode(original);
        System.out.println("Unicode encoding: " + unicodeStr);

        // Convert Unicode to string
        String decodedStr = UnicodeUtil.toString(unicodeStr);
        System.out.println("After decoding: " + decodedStr);
    }
}

Please note that Hutool’s tool class is used here. Make sure the Hutool library is introduced in the project. These examples show how to use Hutool to process strings and choose the appropriate tool according to actual needs to improve development efficiency.

Second: date operation

Hutool simplifies date operations and provides easy-to-use functions such as date formatting, date difference calculation, and date range acquisition. We’ll show you how to use these features to avoid spending too much time on date processing.

In Hutool, date operations have indeed become more simplified and convenient. Below is sample code for some common date manipulation functions.

1. Date formatting

import cn.hutool.core.date.DateUtil;

public class DateFormatExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        // Get the current time
        String nowStr = DateUtil.now();
        System.out.println("Current time: " + nowStr);

        //Format date
        String formattedDate = DateUtil.format(DateUtil.date(), "yyyy-MM-dd HH:mm:ss");
        System.out.println("After formatting: " + formattedDate);
    }
}

2. Calculate date difference

import cn.hutool.core.date.DateUnit;

public class DateDiffExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        //The difference in days between two dates
        long daysBetween = DateUtil.betweenDay(DateUtil.parse("2023-01-01"), DateUtil.date(), true);
        System.out.println("Days difference: " + daysBetween);

        // Calculate the number of hours difference between two dates
        long hoursBetween = DateUtil.between(DateUtil.parse("2023-01-01 12:00:00"), DateUtil.date(), DateUnit.HOUR);
        System.out.println("Hour difference: " + hoursBetween);
    }
}

3. Get date range

import cn.hutool.core.date.DateRange;

public class DateRangeExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        // Get the date range for this week
        DateRange thisWeekRange = DateUtil.thisWeek();
        System.out.println("This week's date range: " + thisWeekRange);

        // Get the specified date range
        DateRange customRange = DateUtil.range(DateUtil.parse("2023-01-01"), DateUtil.parse("2023-01-10"));
        System.out.println("Custom date range: " + customRange);
    }
}

These examples show how to use Hutool to simplify date operations. Make sure you include the Hutool library in your project to use these functions. Through these tools, you can more easily format dates, calculate date differences, and obtain date ranges, improving development efficiency.

Third: Network request

Through Hutool, we can easily make HTTP requests and support various methods such as GET and POST. We will demonstrate how to use Hutool for interface testing, data collection and other tasks.

Making network requests using Hutool is indeed a convenient task. Below is some sample code showing how to use Hutool to make HTTP requests, including GET and POST methods.

1. Send GET request

import cn.hutool.http.HttpUtil;

public class HttpGetExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        //Send GET request
        String getUrl = "https://jsonplaceholder.typicode.com/posts/1";
        String result = HttpUtil.get(getUrl);
        System.out.println("GET request result: " + result);
    }
}

2. Send POST request

import cn.hutool.http.HttpRequest;

public class HttpPostExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        //Send POST request
        String postUrl = "https://jsonplaceholder.typicode.com/posts";
        String postData = "{"title":"foo","body":"bar","userId":1}";
        
        String result = HttpRequest.post(postUrl)
                .body(postData)
                .execute().body();
        
        System.out.println("POST request result: " + result);
    }
}

3. Set request headers and parameters

import cn.hutool.http.Header;
import cn.hutool.http.HttpRequest;

public class HttpRequestOptionsExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        //Set request headers and parameters
        String url = "https://jsonplaceholder.typicode.com/comments";
        
        String result = HttpRequest.get(url)
                .header(Header.USER_AGENT, "Hutool HTTP")
                .form("postId", "1")
                .form("name", "John Doe")
                .form("email", "[email protected]")
                .execute().body();
                
        System.out.println("Request result: " + result);
    }
}

Make sure to include the Hutool library in your project in order to use these HTTP request functions. These examples show how to use Hutool to make GET and POST requests, and also demonstrate how to set request headers and parameters. This is useful for tasks such as interface testing and data collection.

Fourth: File Operation

Hutool simplifies file and IO operations, including file reading and writing, copying, compression and other functions. We’ll introduce these features and show how to apply them in your projects.

Hutool provides many convenient file and IO operation tools. The following are some sample codes that demonstrate how to use Hutool to perform file reading, writing, copying, compression and other operations.

1. File reading and writing

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.file.FileReader;
import cn.hutool.core.io.file.FileWriter;

public class FileReadWriteExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        //File reading
        FileReader reader = new FileReader("example.txt");
        String content = reader.readString();
        System.out.println("File content: " + content);

        // file writing
        FileWriter writer = new FileWriter("newFile.txt");
        writer.write("Hello, Hutool!");
        writer.close();
        System.out.println("File written successfully!");
    }
}

2. File copy

import cn.hutool.core.io.FileUtil;

public class FileCopyExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        //File copy
        FileUtil.copy("source.txt", "destination.txt", true);
        System.out.println("File copy successful!");
    }
}

3. File compression and decompression

import cn.hutool.core.util.ZipUtil;

public class FileCompressionExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        //File compression
        ZipUtil.zip("sourceFolder", "compressed.zip");
        System.out.println("File compression successful!");

        //File decompression
        ZipUtil.unzip("compressed.zip", "unzippedFolder");
        System.out.println("File decompression successful!");
    }
}

Make sure the Hutool library is introduced in the project to use these file and IO operation functions. These examples show how to use Hutool to perform file reading, writing, copying, compression and other operations, helping to simplify file processing tasks in projects.

Fifth: Other practical tools

In addition to the above functions, Hutool also contains many other practical tools, such as encryption and decryption, Bean operations, image processing, etc. We will introduce these tools one by one to give you a comprehensive understanding of the power of Hutool.

1. Encryption and decryption tool

import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.SecureUtil;
import cn.hutool.crypto.digest.DigestAlgorithm;
import cn.hutool.crypto.digest.Dgester;

public class EncryptionDecryptionExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        //MD5 encryption
        String originalStr = "Hello, Hutool!";
        String md5Result = SecureUtil.md5(originalStr);
        System.out.println("MD5 encryption result: " + md5Result);

        // SHA256 encryption
        Digester sha256 = new Digester(DigestAlgorithm.SHA256);
        String sha256Result = sha256.digestHex(originalStr);
        System.out.println("SHA256 encryption result: " + sha256Result);

        // Base64 encoding and decoding
        String base64Encoded = StrUtil.utf8Bytes(originalStr).toString();
        String base64Decoded = StrUtil.str(base64Encoded, StrUtil.CHARSET_UTF_8);
        System.out.println("Base64 encoding result: " + base64Encoded);
        System.out.println("Base64 decoding result: " + base64Decoded);
    }
}

2. Bean operation tools

import cn.hutool.core.bean.BeanUtil;

public class BeanOperationExample {<!-- -->

    public static class User {<!-- -->
        private String name;
        private int age;

        // Omit constructor and getter/setter methods
    }

    public static void main(String[] args) {<!-- -->
        // Bean property copy
        User sourceUser = new User();
        sourceUser.setName("John");
        sourceUser.setAge(25);

        User targetUser = new User();
        BeanUtil.copyProperties(sourceUser, targetUser);
        System.out.println("Target User: " + targetUser);
    }
}

3. Image processing tools

import cn.hutool.core.img.Img;
import cn.hutool.core.img.ImgUtil;

public class ImageProcessingExample {<!-- -->

    public static void main(String[] args) {<!-- -->
        // Image zoom
        Img img = ImgUtil.read("original.jpg");
        img.scale(0.8f) // scaling ratio
           .write("scaled.jpg");

        System.out.println("Picture scaling successful!");
    }
}

These examples demonstrate the use of Hutool’s encryption and decryption tools, Bean operation tools, and image processing tools. Make sure to include the Hutool library in your project to use these utilities. Hutool’s comprehensive functionality makes it a powerful tool library for Java development.