java 字符串转base64

以下是Java中字符串转换为Base64的示例代码：

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

public class Main {
    public static void main(String[] args) {
        String str = "Hello, World!";
        
        // 将字符串转为Base64
        String base64String = Base64.getEncoder().encodeToString(str.getBytes(StandardCharsets.UTF_8));
        System.out.println("Base64 encoded string: " + base64String);
        
        // 将Base64字符串解析成原来的内容
        byte[] decodedBytes = Base64.getDecoder().decode(base64String);
        String decodedString = new String(decodedBytes, StandardCharsets.UTF_8);
        System.out.println("Decoded string: " + decodedString);
    }
}