Question

我面临几天前遇到的问题。我必须解析此文件并将字符串转换为日期。我几天前对另一个CSV文件做了同样的事情。但是，新文件出现此错误：java.text.ParseException：Unparseable date：“”3/4/2011“”

为什么字符串会在其周围打印两个“”？我认为这是问题的根本原因。我发布下面的代码。请注意，相同的代码适用于另一个文件，其中日期打印为3/4/2011，周围没有“”。

     WritableWorkbook wbwrite=null;
     WritableSheet sheet=null;
     Label lwrite=null;
     BufferedReader br=null;
     Number n=null;

     String strFile="quotes.csv";
 String strLine = "";
     String st[];
     String delimiter="[,]";

int lineNumber = 0, tokenNumber = 0;
    int length=0;
    int counter=0;
    Calendar cal = Calendar.getInstance();

    DateTime datecell=null;

     if(strFile.equals("quotes.csv"))
     {
         System.out.print("in loop if");

         try
         {
            File file=new File("quotes.xls");
            wbwrite=Workbook.createWorkbook(file);
            System.out.print("file created");
            //path=file.getCanonicalPath();
            sheet = wbwrite.createSheet("Sheet 1", 0);
            lwrite=null;
            n=null;
            Date dtest=null;
            DateFormat df=null;
            Date dadd=null;

            df=new SimpleDateFormat("dd-mm-yy");

    //create BufferedReader to read csv file
    br = new BufferedReader( new FileReader(strFile));
    strLine = "";
    //st[]=empty;
            delimiter="[,]";
    lineNumber = 0; tokenNumber = 0;
            length=0;
    //read comma separated file line by line
    while( (strLine = br.readLine()) != null)
    {
        //System.out.print("strline="+strLine);
        //break comma separated line using ","
        st=strLine.split(delimiter);
                    length=0;
        while(length<st.length)
        {
            //display csv values
            //
            System.out.println("Line # " + lineNumber +
                    ", Token # " + tokenNumber
                    + ", Token : "+ st[length]);
                           if(tokenNumber==2)
                           {
                                 System.out.print("date="+st[length]);
                                  DateFormat formatter = new SimpleDateFormat("dd-MM-yyyy");
                                  Date date = (Date)formatter.parse(st[length]);
                                  System.out.print("date="+date);
                                  cal.setTime(date);
                                  cal.set(Calendar.HOUR_OF_DAY, 17);
                                  cal.set(Calendar.MINUTE, 30);
                                  cal.set(Calendar.SECOND, 0);
                                  cal.set(Calendar.MILLISECOND, 0);
                                  date = cal.getTime();
                                  System.out.print("date="+date);
                                  datecell=new DateTime(tokenNumber,lineNumber,date);
                                  sheet.addCell(datecell);
                                  lwrite=new Label(tokenNumber,lineNumber,st[length]);
                                  sheet.addCell(lwrite);
                         }
                     if(tokenNumber==1||tokenNumber==5||tokenNumber==6||tokenNumber==7)
                     {
                            n=new Number(tokenNumber,lineNumber,Float.parseFloat(st[length]));
                           sheet.addCell(n);
                     }
                     tokenNumber++;
                     length++;
    }
    //reset token number
            //tokenNumber = 0;
}
    wbwrite.write();
    wbwrite.close();
}
catch(Exception e)
{
        System.out.print("error="+e);
}
  }
 }

Answer 1

我解决了。该字符串已经有前导和尾随引号，在解析时会产生双引号。这就是为什么“”2011年3月4日“”。我添加了

      if (st[length].startsWith("\""))
     {
      st[length] = st[length].substring(1, st[length].length());
      }
     if (st[length].endsWith("\""))
  {
        st[length] = st[length].substring(0, st[length].length() - 1);
  }

加上即使是日期格式也是dd-MM-yyyy;改为dd / MM / yyyy。现在我得到了正确的答案。

无法使用jexcel api将字符串解析为日期

1 个答案: