前台js MD5加密 后台 java MD5解密

转载：https://my.oschina.net/qiaojj/blog/514575

记录一下

前端：

// base64加密开始
  var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv"+ "wxyz0123456789+/" + "=";
  function encode64(input) {
          
   
    var output = "";
    var chr1, chr2, chr3 = "";
    var enc1, enc2, enc3, enc4 = "";
    var i = 0;
    do {
          
   
      chr1 = input.charCodeAt(i++);
      chr2 = input.charCodeAt(i++);
      chr3 = input.charCodeAt(i++);
      enc1 = chr1 >> 2;
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
      enc4 = chr3 & 63;
      if (isNaN(chr2)) {
          
   
        enc3 = enc4 = 64;
      } else if (isNaN(chr3)) {
          
   
        enc4 = 64;
      }
      output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2)
          + keyStr.charAt(enc3) + keyStr.charAt(enc4);
      chr1 = chr2 = chr3 = "";
      enc1 = enc2 = enc3 = enc4 = "";
    } while (i < input.length);
    return output;
  }

使用：var password = encode64($("#password").val());

后端：

private static char[] base64EncodeChars = new char[] {
          
    A, B, C, D,
        E, F, G, H, I, J, K, L, M, N, O, P, Q,
        R, S, T, U, V, W, X, Y, Z, a, b, c, d,
        e, f, g, h, i, j, k, l, m, n, o, p, q,
        r, s, t, u, v, w, x, y, z, 0, 1, 2, 3,
        4, 5, 6, 7, 8, 9, +, /, };
		
    private static byte[] base64DecodeChars = new byte[] {
          
    -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59,
        60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
        10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1,
        -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
        38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,
        -1, -1 };
    /**
	 * 对密码进行解密
	 * */
	public static byte[] decode(String str) {
          
   
		byte[] data = str.getBytes();
		int len = data.length;
		ByteArrayOutputStream buf = new ByteArrayOutputStream(len);
		int i = 0;
		int b1, b2, b3, b4;

		while (i < len) {
          
   
			do {
          
   
				b1 = base64DecodeChars[data[i++]];
			} while (i < len && b1 == -1);
			if (b1 == -1) {
          
   
				break;
			}

			do {
          
   
				b2 = base64DecodeChars[data[i++]];
			} while (i < len && b2 == -1);
			if (b2 == -1) {
          
   
				break;
			}
			buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));

			do {
          
   
				b3 = data[i++];
				if (b3 == 61) {
          
   
					return buf.toByteArray();
				}
				b3 = base64DecodeChars[b3];
			} while (i < len && b3 == -1);
			if (b3 == -1) {
          
   
				break;
			}
			buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));

			do {
          
   
				b4 = data[i++];
				if (b4 == 61) {
          
   
					return buf.toByteArray();
				}
				b4 = base64DecodeChars[b4];
			} while (i < len && b4 == -1);
			if (b4 == -1) {
          
   
				break;
			}
			buf.write((int) (((b3 & 0x03) << 6) | b4));
		}
		return buf.toByteArray();
	}

使用：this.setPwd(new String(decode(pwd))); 注意：不能使用decode(pwd).toString，否则会显示数组越界异常