笔试的问题:Unicode与中文的相互转换

[wizardblue]

public static String unicodeToGb(String s);
public static String gbToUnicode(String s);
哪位大哥帮忙写写啊,偶不会

[jFresH_MaN]

/*
* Converts encoded \uxxxx to unicode chars
* and changes special saved chars to their original forms
*/
private String loadConvert(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();
}

/*
* Converts unicodes to encoded \uxxxx
* and writes out any of the characters in specialSaveChars
* with a preceding slash
*/
private String saveConvert(String theString, boolean escapeSpace) {
int len = theString.length();
StringBuffer outBuffer = new StringBuffer(len*2);

for(int x=0; x<len; x++) {
char aChar = theString.charAt(x);
switch(aChar) {
case ' ':
if (x == 0 || escapeSpace)
outBuffer.append('\\');

outBuffer.append(' ');
break;
case '\\':outBuffer.append('\\'); outBuffer.append('\\');
break;
case '\t':outBuffer.append('\\'); outBuffer.append('t');
break;
case '\n':outBuffer.append('\\'); outBuffer.append('n');
break;
case '\r':outBuffer.append('\\'); outBuffer.append('r');
break;
case '\f':outBuffer.append('\\'); outBuffer.append('f');
break;
default:
if ((aChar < 0x0020) || (aChar > 0x007e)) {
outBuffer.append('\\');
outBuffer.append('u');
outBuffer.append(toHex((aChar >> 12) & 0xF));
outBuffer.append(toHex((aChar >> 8) & 0xF));
outBuffer.append(toHex((aChar >> 4) & 0xF));
outBuffer.append(toHex( aChar & 0xF));
} else {
if (specialSaveChars.indexOf(aChar) != -1)
outBuffer.append('\\');
outBuffer.append(aChar);
}
}
}
return outBuffer.toString();
}
jdk的源代码。。