java - 输入数据 : java. lang.NumberFormatException:对于输入字符串: "2 "

Question

这是我从文本文件中得到的数据:

21/08/12#ESE-6329#PV/5732#30
27/08/12#PEA-4567#PV/5732#3@
11/09/12#ESE-5577#Xk/8536#2
14/09/12#PNW-1235#HY/7195#2@

这是主要方法的代码:

File orderData = new File("PurchaseOrderData.txt");            
Scanner dataScan = new Scanner(orderData);

while(dataScan.hasNextLine())
{
    String lineData = dataScan.nextLine();

    Scanner lineScan = new Scanner(lineData);
    lineScan.useDelimiter("#");

    String date = lineScan.next(); // line 259
    String id = lineScan.next();
    String code = lineScan.next();

    String quantityPlus = lineScan.next();

    if(!quantityPlus.contains("@"))
        management.addNewPurchaseOrder(date, id, code, 
                                    Integer.parseInt(quantityPlus)); // line 267
    else
    {
        quantityPlus = quantityPlus.replace("@", "");
        management.addNewPurchaseOrder(date, id, code,
                                    Integer.parseInt(quantityPlus));
        management.startNewMonth();
    }

关于

的第一个实例

management.addNewPurchaseOrder(date, id, code, Integer.parseInt(quantityPlus));

我得到这个异常:

java.lang.NumberFormatException: For input string: "2 "
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at java.lang.Integer.parseInt(Integer.java:615)
    at Assignment2.MainTest.main(MainTest.java:267)

如果我这样做:

String quantityPlus = lineScan.next();
quantityPlus = quantityPlus.replace(" ", "");

我得到以下信息:

java.util.NoSuchElementException
java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Scanner.java:862)
    at java.util.Scanner.next(Scanner.java:1371)
    at Assignment2.MainTest.main(MainTest.java:259)

MainTest.java:259 - String date = lineScan.next();

我也尝试过使用 nextInt()，但结果是一样的。那里出了什么问题？

非常感谢!

Answer 1

MainTest.java:259 - String date = lineScan.next();您应该先检查该行是否为空，这可能就是扫描器抛出异常的原因