手机上通用的UTF8转换程序

    PRivate final String readUnicodeFileUTF8(String filename) {
        StringBuffer sb = new StringBuffer(256);
        try {
            int[] surrogatePair = new int[2];
            InputStream is = this.getClass().getResourceAsStream(filename);

            int val = 0;
            int unicharCount = 0;
            while ((val = readNextCharFromStreamUTF8(is))!=-1) {
                unicharCount++;
                if (val <= 0xFFFF) {
                    // if first value is the Byte Order Mark (BOM), do not add
                    if (! (unicharCount == 1 && val == 0xFEFF)) {
                        sb.append((char)val);
                    }
                } else {
                    supplementCodePointToSurrogatePair(val, surrogatePair);
                    sb.append((char)surrogatePair[0]);
                    sb.append((char)surrogatePair[1]);
                }
            }
            is.close();
        } catch (Exception e) {};

        return new String(sb);
    }
  
    private final static int readNextCharFromStreamUTF8(InputStream is) {
        int c = -1;
        if (is==null) return c;
        boolean complete = false;
      
        try {
            int byteVal;
            int eXPecting=0;
            int composedVal=0;
          
            while (!complete && (byteVal = is.read()) != -1) {
                if (expecting > 0 && (byteVal & 0xC0) == 0x80) {  /* 10xxxxxx */
                    expecting--;
                    composedVal = composedVal ((byteVal & 0x3F) << (expecting*6));
                    if (expecting == 0) {
                        c = composedVal;
                        complete = true;
                        //System.out.println("appending: U+" + Integer.toHexString(composedVal) );
                    }
                } else {
                    composedVal = 0;
                    expecting = 0;
                    if ((byteVal & 0x80) == 0) {    /* 0xxxxxxx */
                        // one byte character, no extending byte expected
                        c = byteVal;
                        complete = true;
                        //System.out.println("appending: U+" + Integer.toHexString(byteVal) );
                    } else if ((byteVal & 0xE0) == 0xC0) {  /* 110xxxxx */
                        expecting = 1;  // expecting 1 extending byte
                        composedVal = ((byteVal & 0x1F) << 6);
                    } else if ((byteVal & 0xF0) == 0xE0) {  /* 1110xxxx */
                        expecting = 2;  // expecting 2 extending bytes
                        composedVal = ((byteVal & 0x0F) << 12);
                    } else if ((byteVal & 0xF8) == 0xF0) {  /* 11110xxx */
                        expecting = 3;  // expecting 3 extending bytes
                        composedVal = ((byteVal & 0x07) << 18);
                    } else {
                        // non conformant utf-8, ignore or catch error
                    }
                }
            }
          
        } catch (Exception e) {
            System.out.println(e.toString());
        }
      
        return c;
    }

    private final static void supplementCodePointToSurrogatePair(int codePoint, int[] surrogatePair) {
        int high4 = ((codePoint >> 16) & 0x1F) - 1;
        int mid6 = ((codePoint >> 10) & 0x3F);
        int low10 = codePoint & 0x3FF;

        surrogatePair[0] = (0xD800 (high4 << 6) (mid6));
        surrogatePair[1] = (0xDC00 (low10));
    }