Base64Util.java

package com.zby.util;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;public class Base64Util {    private static final BASE64Encoder ENCODER = new BASE64Encoder();    private static final BASE64Decoder DECODER = new BASE64Decoder();    private Base64Util() {        throw new RuntimeException("NO!");    }    public static String encode(byte[] data) {        return ENCODER.encodeBuffer(data);    }    public static byte[] decode(String data) throws Exception {        return DECODER.decodeBuffer(data);    }    public static String encodeFromString(String data) {        return encode(data.getBytes());    }    public static String decodeToString(String data) throws Exception {        return new String(decode(data));    }}

TestBase64.java

package com.zby;import com.zby.util.Base64Util;public class TestBase64 {    public static void main(String[] args) throws Exception {        String data = "Hello,World!";        System.out.println("源字符串：" + data);        String encoded = Base64Util.encodeFromString(data);        System.out.println("Base64加密后字符串：" + encoded);        String decoded = Base64Util.decodeToString(encoded);        System.out.println("Base64解密后字符串：" + decoded);    }}

控制台输出：

源字符串：Hello,World!Base64加密后字符串：SGVsbG8sV29ybGQhBase64解密后字符串：Hello,World!