JS URL 使用base64加密与解密

JS编码方式：

<script type="text/javascript">
document.write(encodeURI("http://www.w3school.com.cn/My first/")+ "<br />")//编译
document.write(decodeURI("http://www.w3school.com.cn/My first/")+ "<br />")//反编译
document.write(encodeURI(",/?:@&=+$#")+ "<br />")
document.write(encodeURIComponent("http://www.w3school.com.cn/My first/")+ "<br />")
document.write(escape("http://www.w3school.com.cn/My first/123")+ "<br />")//编译
document.write(unescape("http://www.w3school.com.cn/My first/123")+ "<br />")//反编译
</script>

<script type="text/javascript">
<!--
var keyStr = "ABCDEFGHIJKLMNOP" +
"QRSTUVWXYZabcdef" +
"ghijklmnopqrstuv" +
"wxyz0123456789+/" +
"=";
//加密函数
function encode64(input) {
input = escape(input);//注意escape（）函数
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;
}
//解密函数 
function decode64(input) {
var output = "";
var chr1, chr2, chr3 = "";
var enc1, enc2, enc3, enc4 = "";
var i = 0;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
var base64test = /[^A-Za-z0-9\+\/\=]/g;
if (base64test.exec(input)) {
alert("There were invalid base64 characters in the input text.\n" +
"Valid base64 characters are A-Z, a-z, 0-9, ‘+‘, ‘/‘, and ‘=‘\n" +
"Expect errors in decoding.");
}
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
do {
enc1 = keyStr.indexOf(input.charAt(i++));
enc2 = keyStr.indexOf(input.charAt(i++));
enc3 = keyStr.indexOf(input.charAt(i++));
enc4 = keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
chr1 = chr2 = chr3 = "";
enc1 = enc2 = enc3 = enc4 = "";
} while (i < input.length);
return unescape(output);//注意unescape（）函数
} 
//--></script>

private static String unescape(String src) {   
        StringBuffer tmp = new StringBuffer();   
        tmp.ensureCapacity(src.length());   
        int lastPos = 0, pos = 0;   
        char ch;   
        while (lastPos < src.length()) {   
            pos = src.indexOf("%", lastPos);   
            if (pos == lastPos) {   
                if (src.charAt(pos + 1) == ‘u‘) {   
                    ch = (char) Integer.parseInt(src   
                            .substring(pos + 2, pos + 6), 16);   
                    tmp.append(ch);   
                    lastPos = pos + 6;   
                } else {   
                    ch = (char) Integer.parseInt(src   
                            .substring(pos + 1, pos + 3), 16);   
                    tmp.append(ch);   
                    lastPos = pos + 3;   
                }   
            } else {   
                if (pos == -1) {   
                    tmp.append(src.substring(lastPos));   
                    lastPos = src.length();   
                } else {   
                    tmp.append(src.substring(lastPos, pos));   
                    lastPos = pos;   
                }   
            }   
        }   
        return tmp.toString();   
    }

public static String decode64(String encode){
  //调用org.apache.commons.codec.binary.Base64包，在commons-codec-1.3.jar中
  Base64 base64 = new Base64();
  byte[] byteOfEncode = encode.getBytes();
  byte[] byteOfDecode = Base64.decodeBase64(byteOfEncode);//调用decodeBase64方法
  String decode = new String(byteOfDecode);
  return  unescape(decode);//调用unescape（String src）方法
}
附:在网上找到的java编写的escape（）方法：
public class EscapeUnescape {   
       
    public static String escape(String src) {   
        int i;   
        char j;   
        StringBuffer tmp = new StringBuffer();   
        tmp.ensureCapacity(src.length() * 6);   
        for (i = 0; i < src.length(); i++) {   
            j = src.charAt(i);   
            if (Character.isDigit(j) || Character.isLowerCase(j)   
                    || Character.isUpperCase(j))   
                tmp.append(j);   
            else if (j < 256) {   
                tmp.append("%");   
                if (j < 16)   
                    tmp.append("0");   
                tmp.append(Integer.toString(j, 16));   
            } else {   
                tmp.append("%u");   
                tmp.append(Integer.toString(j, 16));   
            }   
        }   
        return tmp.toString();   
    }

/// <summary>
/// Encrypt 的摘要说明
/// </summary>
public class Encrypt
{
    public Encrypt()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    /// <summary>
    /// Base64加密，采用utf8编码方式加密
    /// </summary>
    /// <param name="source">待加密的明文</param>
    /// <returns>加密后的字符串</returns>
    public static string EncodeBase64(string source)
    {
       return Convert.ToBase64String(Encoding.Default.GetBytes(source));
    }
    /// <summary>
    /// Base64解密
    /// </summary>
    /// <param name="result">待解密的密文</param>
    /// <returns>解密后的字符串</returns>
    public static string DecodeBase64(string result)
    {
        return Encoding.Default.GetString(Convert.FromBase64String(result));
    }

}