[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);
         }
     }