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   private static String[] getSplit(String txt) throws Exception {
        ArrayList<String> list = new ArrayList<String>();
        int b=0;
        int begin=0;
        StringBuffer buff=new StringBuffer();
        int iLen= txt.length();
        for (int i =0 ;i<iLen;i++){
            String s=txt.substring(i,i+1);
            switch (b){
                case 0:
                    if (s.equals("\"")){
                        b=1;
                        begin=i;
                        continue;
                    }else
                        throw new Exception("没有引号");
                case 1:  // 进入 引号中
                    if (s.equals("\"")) {
                        b=2;

                        continue;
                    }else {
                        buff.append(s);
                        continue;
                    }
                case 2:
                    if (s.equals("\"")) { //字段中出现 引号  "asdfasd "" qweqwe"
                      buff.append("\"");
                        b=1;
                    } else if (s.equals(",")){
                        b=0;
                        list.add(buff.toString());
                        buff=new StringBuffer();
                    }


            }
        }
       int resultSize = list.size();
       String[] result = new String[resultSize];
       return list.subList(0, resultSize).toArray(result);

    }