Java base64 编码、解码

public class uploadServletTest {

    @Test
    public void name() throws IOException {

        String content = "这里是Base64编码的内容";

        //编码
        BASE64Encoder base64Encoder = new BASE64Encoder();
        String encodeStr = base64Encoder.encode(content.getBytes("utf-8"));
        System.out.println(encodeStr);

        //解码
        BASE64Decoder base64Decoder = new BASE64Decoder();
        byte[] bytes = base64Decoder.decodeBuffer(encodeStr);
        String s = new String(bytes, "utf-8");
        System.out.println(s);
    }
}

手动。。

    public static String decipher(String s) {
        int[] a = {4, 9, 6, 2, 8, 7, 3};
        char[] res = new char[s.length()];

        for (int i = 0, j = 0; j < s.length(); j++, i = (i + 1) % 7) {
            res[j] = (char) ((byte) s.charAt(j) + a[i]);
            if ((byte) res[j] > 122)
                res[j] = (char) ((byte) res[j] - 90);
        }
        return String.valueOf(res);
    }
    public static String encipher(String s) {
        int[] a = {4, 9, 6, 2, 8, 7, 3};
        char[] res = new char[s.length()];

        for (int i = 0, j = 0; j < s.length(); j++, i = (i + 1) % 7) {
            res[j] = (char) ((byte) s.charAt(j) - a[i]);
            if ((byte) res[j] < 32)
                res[j] = (char) ((byte) res[j] + 90);
        }
        return String.valueOf(res);
    }