CacheDataOutput.java 文件源码

@Override
public void writeUTF(String s) throws IOException {
    int slen = s.length();
    int utflen = IOUtilFunctions.getUTFSize(s) - 2;
    if (utflen-2 > 65535)
        throw new UTFDataFormatException("encoded string too long: "+utflen);

    //write utf len (2 bytes) 
    writeShort(utflen);

    //write utf payload
    for( int i=0; i<slen; i++ ) {
        char c = s.charAt(i);
        if( c>= 0x0001 && c<=0x007F ) //1 byte range
            writeByte(c);
        else if( c>=0x0800 ) { //3 byte range
            _buff[_count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
            _buff[_count++] = (byte) (0x80 | ((c >>  6) & 0x3F));
            _buff[_count++] = (byte) (0x80 | ((c >>  0) & 0x3F));
        }
        else { //2 byte range and null
            _buff[_count++] = (byte) (0xC0 | ((c >>  6) & 0x1F));
            _buff[_count++] = (byte) (0x80 | ((c >>  0) & 0x3F));
        }
    }
}