Question

我正在使用csvwriter编写一个csv文件，然后调用它的方法writeAll。写完后我使用缓冲读取器读取相同的文件，导致数字格式异常。我该如何解决？

public static void writeInventoryToUpdate(List<String[]> data)throws IOException {

    String csv = "E:\\Semester 3\\PointOfSale2\\Inventory.csv";
    CSVWriter writer = new CSVWriter(new FileWriter(csv));

    writer.writeAll(data);
    writer.close();        
}


public void initInventory() throws FileNotFoundException, IOException {

    BufferedReader readInventory=new BufferedReader(new FileReader("E:\\Semester 3\\PointOfSale2\\Inventory.csv"));

    String line=readInventory.readLine();

    StringTokenizer nextItem;
    while(line!=null){
        nextItem=new StringTokenizer(line, ",");
        while(nextItem.hasMoreTokens()){
            int productID=Integer.parseInt(nextItem.nextToken()); //Exception occuring here
            int quantity=Integer.parseInt(nextItem.nextToken());
            Inventory inventory=new Inventory(productID, quantity);
            inStock.add(inventory);
            line=readInventory.readLine();
        }
    }
    readInventory.close();
}

Answer 1

你的代码大多是正确的想法，但有关于它的流程的一些问题

BufferedReader readInventory=new BufferedReader(new FileReader("E:\\Semester 3\\PointOfSale2\\Inventory.csv"));

for(String line = readInventory.readLine(); line != null; line = readInventory.readLine())
{
    StringTokenizer nextItem = new StringTokenizer(line, ",");
    if(nextItem.countTokens() >= 2)
    {
        int productID = Integer.parseInt(nextItem.nextToken());
        int quantity = Integer.parseInt(nextItem.nextToken());
        Inventory inventory=new Inventory(productID, quantity);
        inStock.add(inventory);
    }
}
readInventory.close();

根据输入

，这里应该有用

12345,67890
15243,60798
3,6
77,12355678,123 //anything past the first two values are ignored
555
777,333 //and single value things are skipped

如果没有看到您尝试解析的CSV文件类型，我无法为您提供更好的解决方案

但是对于CSV文件的最基本形式（两个用逗号分隔的int值），这应该可以正常工作

读取csv文件导致数字格式异常

1 个答案: