base64

import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class Base64Example {
    public static void main(String[] args) {
        String originalString = "oa:123456";
        
        // 使用Base64編碼器
        Base64.Encoder encoder = Base64.getEncoder();
        
        // 將字串轉換為位元組陣列
        byte[] encodedBytes = encoder.encode(originalString.getBytes(StandardCharsets.UTF_8));
        
        // 將位元組陣列轉換為字串
        String encodedString = new String(encodedBytes, StandardCharsets.UTF_8);
        
        System.out.println("原始字串: " + originalString);
        System.out.println("Base64 編碼後: " + encodedString);
    
        Base64.Decoder decoder = Base64.getDecoder();
    
        byte[] decodedBytes = decoder.decode(encodedString);
    
        // 將解碼後的位元組陣列轉換為字串
        String decodedString = new String(decodedBytes, StandardCharsets.UTF_8);
        System.out.println("原始字串: " + decodedString);
    }
}

    <dependencies>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.7</version>
        </dependency>
    </dependencies>

import cn.hutool.core.codec.Base64;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.StrUtil;


public class Base64Example2 {
    public static void main(String[] args)  {
        String originalString = "oa:123456";
        System.out.println(originalString);
        byte[] plain = StrUtil.bytes(originalString, CharsetUtil.CHARSET_UTF_8);
        String cipherText = Base64.encode(plain);
        System.out.println(cipherText);
        byte[] encData = Base64.decode(cipherText);
        String encStr = StrUtil.str(encData, CharsetUtil.CHARSET_UTF_8);
        System.out.println(encStr);
    }
}

    public static String getBase64Str(String originalString) {
        java.util.Base64.Encoder encoder = java.util.Base64.getEncoder();
        byte[] encodedBytes = encoder.encode(originalString.getBytes(StandardCharsets.UTF_8));
        return new String(encodedBytes);
    }
    public static String getOriginalStr(String base64Str) {
        java.util.Base64.Decoder decoder = java.util.Base64.getDecoder();
        byte[] decodedBytes = decoder.decode(base64Str);
        return new String(decodedBytes, StandardCharsets.UTF_8);
    }