URL安全（js传参加密，java传参解密） 采用encode64技术

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1.js传参加密方法

function encode64(input) {
	    var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv" + "wxyz0123456789+/" + "=";
	    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;
	}

2.后台接收到传参后对参数解密

import java.io.ByteArrayOutputStream;
public class Base64Util {
	    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 };
        
		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();
			
     }
  
		
		public static String decodeToString(String param){
	        return new String(decode(param)).replace("\"", "");
	    }
}