IP路由过程解析

今日在写android的客户端，发现字符转化是个大问题。

下面是Unicode转UTF-8的转化，便于以后使用

private static String decodeUnicode(String theString) {

char aChar;

int len = theString.length();

StringBuffer outBuffer = new StringBuffer(len);

for (int x = 0; x < len;) {

aChar = theString.charAt(x++);

if (aChar == '\\') {

aChar = theString.charAt(x++);

if (aChar == 'u') {

// Read the xxxx

int value = 0;

for (int i = 0; i < 4; i++) {

aChar = theString.charAt(x++);

switch (aChar) {

case '0':

case '1':

case '2':

case '3':

case '4':

case '5':

case '6':

case '7':

case '8':

case '9':

value = (value << 4) + aChar - '0';

break;

case 'a':

case 'b':

case 'c':

case 'd':

case 'e':

case 'f':

value = (value << 4) + 10 + aChar - 'a';

break;

case 'A':

case 'B':

case 'C':

case 'D':

case 'E':

case 'F':

value = (value << 4) + 10 + aChar - 'A';

break;

default:

throw new IllegalArgumentException(

"Malformed \\uxxxx encoding.");

}

}

outBuffer.append((char) value);

} else {

if (aChar == 't')

aChar = '\t';

else if (aChar == 'r')

aChar = '\r';

else if (aChar == 'n')

aChar = '\n';

else if (aChar == 'f')

aChar = '\f';

outBuffer.append(aChar);

}

} else

outBuffer.append(aChar);

}

return outBuffer.toString();

}