java实现js的中一样的函数方法

发布网友发布时间：2022-05-12 21:30

共1个回答

热心网友时间：2022-04-24 19:48

package know.t5;
public class UrlEncodeWithoutASCII {
public static String encode(String input)
    {
        StringBuilder sb = new StringBuilder(input.length() + 16);
        appendEncoded(sb, input);
        return sb.toString();
    }
    public static StringBuilder appendEncoded(StringBuilder sb, String input)
    {
        int safe[] = SAFE_ASCII;
        int i = 0;
        int c;
        for(int len = input.length(); i < len; i += Character.charCount(c))
        {
            c = input.codePointAt(i);
            if(c <= 127)
            {
                if(safe[c] != 0)
                    sb.append((char)c);
                else
                    appendSingleByteEncoded(sb, c);
            } else
            {
                appendMultiByteEncoded(sb, c);
            }
        }
        return sb;
    }
    private static final void appendSingleByteEncoded(StringBuilder sb, int value)
    {
     sb.append('%');
        sb.append(HEX[value >> 4]);
        sb.append(HEX[value & 15]);
    }
    private static final void appendMultiByteEncoded(StringBuilder sb, int value)
    {
        if(value < 2048)
        {
            appendSingleByteEncoded(sb, 192 | value >> 6);
            appendSingleByteEncoded(sb, 128 | value & 63);
        } else
        if(value < 65536)
        {
            appendSingleByteEncoded(sb, 224 | value >> 12);
            appendSingleByteEncoded(sb, 128 | value >> 6 & 63);
            appendSingleByteEncoded(sb, 128 | value & 63);
        } else
        {
            appendSingleByteEncoded(sb, 240 | value >> 18);
            appendSingleByteEncoded(sb, 128 | value >> 12 & 63);
            appendSingleByteEncoded(sb, 128 | value >> 6 & 63);
            appendSingleByteEncoded(sb, 128 | value & 63);
        }
    }
    private static final int SAFE_ASCII[];
    private static final char HEX[] = "0123456789ABCDEF".toCharArray();
    static
    {
        SAFE_ASCII = new int[128];
        for(int i = 97; i <= 122; i++)
            SAFE_ASCII[i] = 1;
        for(int i = 65; i <= 90; i++)
            SAFE_ASCII[i] = 1;
        for(int i = 39; i <= 57; i++){
         if(i==43||i==44||i==47)
          continue;
         SAFE_ASCII[i] = 1;
        }
        SAFE_ASCII[33] = 1;
        SAFE_ASCII[95] = 1;
        SAFE_ASCII[126] = 1;
    }
}

encodeURIComponent函数可以用上面的类encode方法代替，unescape可以用任意URLDecoder代替，btoa可以用任意Base64工具代替（参数为byte[]时需将字符串按utf8编码），这个方案你可以试试效果