UCS2转UTF-8方法

前两天工作时需要将UCS2编码转为UTF-8编码在网页显示。网上找了好久没有好方法，后来还是同事给了一个自己的函数，顺利解决问题。把函数贴在这里，愿帮助遇到同样问题的工友们~

/**
     * UCS2转码为utf-8
     *
     * @author Shangxj
     * @param theString
     * @return String
     */
    public static String UCS2ToUtf8(String theString) {

// 对theString参数进行处理
        String strU = "\\u";
        String resultStr = "";
        int j = 0;
        int length = theString.trim().length();
        StringBuffer outBuffer = new StringBuffer(length);

try {
            if (!(theString == null || theString.trim().equals(""))) {

for (int i = -4; i < length - 4; i = i + 4) {
                    String temStr = theString.trim().substring(i + 4, j + 4);
                    resultStr = resultStr + strU + temStr;
                    j = j + 4;
                }
                char aChar;
                int len = resultStr.length();
                for (int x = 0; x < len;) {
                    aChar = resultStr.charAt(x++);
                    if (aChar == '\\') {
                        aChar = resultStr.charAt(x++);
                        if (aChar == 'u') {
                            // Read the xxxx
                            int value = 0;
                            for (int i = 0; i < 4; i++) {
                                aChar = resultStr.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;
                                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);
                }
            }
        } catch (StringIndexOutOfBoundsException siobe) {
            siobe.printStackTrace();
        }
        return outBuffer.toString();
    }
}