[1]字符串按中文符占3位进行指定长度剪切[2]Double类型截取指定长度（指定长度=整数位+小数位）

    /** 将中文字符串剪切为在当前db2(编码GBK)中所占用的长度*/
    public String cutStringForDb2(String src,Integer size) {
        int len = src.length();
        int res_len = 0;
        StringBuilder res_b = new StringBuilder();
        for (int i = 0 ; i < len; i++) {
            if (isChinese(src.charAt(i))) {
                res_len+=3;
            } else {
                res_len+=1;
            }
            if (res_len>size) {
                break;
            } else {
                res_b.append(src.charAt(i));
            }
        }
        return res_b.toString();
    }
    
    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.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION) {
            return true;
        }
        return false;
    }
    
    public Double cutDouble(String src,Integer intValue,Integer pointValue) {
        if (src.length() > intValue) {
            if (src.matches("[0-9]*\.[0-9]*")) {
                String[] strs = src.split("\.");
                StringBuilder res = new StringBuilder().append(strs[0].length()>intValue?
                        strs[0].substring(0, intValue):strs[0]);
                res.append(strs[1].length()>pointValue?strs[1].substring(0, pointValue):strs[1]);
                return Double.parseDouble(res.toString());
            } else if (src.matches("[0-9]*")){
                return Double.parseDouble(src.substring(0, intValue));
            } else {
                return 0.0D;
            }
        } else {
            return Double.parseDouble(src);
        }
    }