<%!
public String string2Json(String s) {      
    StringBuffer sb = new StringBuffer();
    for (int i=0; i<s.length(); i++) {
        char c = s.charAt(i);
         switch (c){
         case '\"':
             sb.append("\\\"");
             break;
         case '\\':
             sb.append("\\\\");
             break;
         case '/':
             sb.append("\\/");
             break;
         case '\b':
             sb.append("\\b");
             break;
         case '\f':
             sb.append("\\f");
             break;
         case '\n':
             sb.append("\\n");
             break;
         case '\r':
             sb.append("\\r");
             break;
         case '\t':
             sb.append("\\t");
             break;
         default:
             sb.append(c);
         }
     }
     return sb.toString();
}

public String chinaToUnicode(String str) {
    String result = "";
    for (int i = 0; i < str.length(); i++) {
        int chr1 = (char) str.charAt(i);
        if (chr1 >= 19968 && chr1 <= 171941) {// 汉字范围 \u4e00-\u9fa5 (中文)
            result += "\\u" + Integer.toHexString(chr1);
        } else {
            result += str.charAt(i);
        }
    }
    return result;
}

/**
 * 判断是否为中文字符
 *
 * @param c
 * @return
 */
public boolean isChinese(char c) {
    Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
    if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
            || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
            || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
            || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
            || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
            || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
        return true;
    }
    return false;
}


//Unicode转中文
public String decodeUnicode(final String unicode) {
    StringBuffer string = new StringBuffer();

    String[] hex = unicode.split("\\\\u");

    for (int i = 0; i < hex.length; i++) {

        try {
            // 汉字范围 \u4e00-\u9fa5 (中文)
            if(hex[i].length()>=4){//取前四个，判断是否是汉字
                String chinese = hex[i].substring(0, 4);
                try {
                    int chr = Integer.parseInt(chinese, 16);
                    boolean isChinese = isChinese((char) chr);
                    //转化成功，判断是否在  汉字范围内
                    if (isChinese){//在汉字范围内
                        // 追加成string
                        string.append((char) chr);
                        //并且追加  后面的字符
                        String behindString = hex[i].substring(4);
                        string.append(behindString);
                    }else {
                        string.append(hex[i]);
                    }
                } catch (NumberFormatException e1) {
                    string.append(hex[i]);
                }

            }else{
                string.append(hex[i]);
            }
        } catch (NumberFormatException e) {
            e.printStackTrace();
            string.append(hex[i]);
        }
    }

    return string.toString();
}
%>