/**
* =====================================================================
*
* @file JUnicode.java
* @Module Name com.joysee.common.utils
* @author YueLiang
* @OS version 1.0
* @Product type: JoySee
* @date 2013年10月29日
* @brief This file is the http **** implementation.
* @This file is responsible by ANDROID TEAM.
* @Comments:
* =====================================================================
* Revision History:
*
* Modification Tracking
*
* Author Date OS version Reason
* ---------- ------------ ------------- -----------
* YueLiang 2013年10月29日 1.0 Check for NULL, 0 h/w
* =====================================================================
**/
package com.letv.commonjar.utils;
public class JUnicode {
private JUnicode() {
}
public static String decode(String str) throws Exception {
if (str == null) {
throw new IllegalAccessError("Invalid param, str is null.");
}
char[] in = str.toCharArray();
int off = 0;
char c;
char[] out = new char[in.length];
int outLen = 0;
while (off < in.length) {
c = in[off++];
if (c == '\\') {
if (in.length > off) { // 是否有下一个字符
c = in[off++]; // 取出下一个字符
} else {
out[outLen++] = '\\'; // 末字符为'\'，返回
break;
}
if (c == 'u') { // 如果是"\\u"
int value = 0;
if (in.length > off + 4) { // 判断"\\u"后边是否有四个字符
boolean isUnicode = true;
for (int i = 0; i < 4; i++) { // 遍历四个字符
c = in[off++];
switch (c) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
value = (value << 4) + c - '0';
break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
value = (value << 4) + 10 + c - 'a';
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
value = (value << 4) + 10 + c - 'A';
break;
default:
isUnicode = false; // 判断是否为unicode码
}
}
if (isUnicode) { // 是unicode码转换为字符
out[outLen++] = (char) value;
} else { // 不是unicode码把"\\uXXXX"填入返回值
off = off - 4;
out[outLen++] = '\\';
out[outLen++] = 'u';
out[outLen++] = in[off++];
}
} else { // 不够四个字符则把"\\u"放入返回结果并继续
out[outLen++] = '\\';
out[outLen++] = 'u';
continue;
}
} else {
switch (c) { // 判断"\\"后边是否接特殊字符，回车，tab一类的
case 't':
c = '\t';
out[outLen++] = c;
break;
case 'r':
c = '\r';
out[outLen++] = c;
break;
case 'n':
c = '\n';
out[outLen++] = c;
break;
case 'f':
c = '\f';
out[outLen++] = c;
break;
default:
out[outLen++] = '\\';
out[outLen++] = c;
break;
}
}
} else {
out[outLen++] = (char) c;
}
}
return new String(out, 0, outLen);
}
}