直接上代码
private static String decodeUnicode(String input) {
if (null == input)
return input;
int len = input.length();
StringBuilder output = new StringBuilder(len);
for (int x = 0; x < len; x++) {
char ch = input.charAt(x);
if (ch != '\\') {
output.append(ch);
} else {
x++;
if (x != len) {
ch = input.charAt(x);
if (ch == 'u') {
if (x + 5 > len) {
output.append(input.substring(x - 1));
x += 4;
} else {
String val = input.substring(x + 1, x + 5);
try {
output.append((char) Integer.parseInt(val, 16));
} catch (NumberFormatException e) {
output.append(input.substring(x - 1, x + 5));
}
x += 4;
}
} else
output.append(ch);
}
}
}
return output.toString();
}
private static String encodeUnicode(String input) {
if (null == input)
return input;
int len = input.length();
StringBuilder output = new StringBuilder(len * 2);
for (int x = 0; x < len; x++) {
char ch = input.charAt(x);
if ((ch < ' ') || (ch > '~')) {
output.append("\\u");
String hex = Integer.toHexString(ch);
for (int i = 0; i < 4 - hex.length(); i++) {
output.append('0');
}
output.append(hex);
} else {
output.append(ch);
}
}
return output.toString();
}注意stringbuilder和stringbuffer的区别
stringbuffer线程安全，stringbuilder线程不安全，二者功能完全一样。没有异步情况stringbuilder会快一些。