java Base64 加密解密

Java提供了Base64工具类，可以方便地进行Base64加密解密操作。以下是示例代码：

Base64加密

import java.util.Base64;

public class Base64Demo {
    public static void main(String[] args) {
        String str = "Hello, world!";
        byte[] bytes = str.getBytes();
        byte[] encodedBytes = Base64.getEncoder().encode(bytes);
        String encodedStr = new String(encodedBytes);
        System.out.println("Base64 encoded string: " + encodedStr);
    }
}

输出结果为：Base64 encoded string: SGVsbG8sIHdvcmxkIQ==

Base64解密

import java.util.Base64;

public class Base64Demo {
    public static void main(String[] args) {
        String encodedStr = "SGVsbG8sIHdvcmxkIQ==";
        byte[] encodedBytes = encodedStr.getBytes();
        byte[] decodedBytes = Base64.getDecoder().decode(encodedBytes);
        String decodedStr = new String(decodedBytes);
        System.out.println("Base64 decoded string: " + decodedStr);
    }
}

输出结果为：Base64 decoded string: Hello, world!