在Java程序中找不到资源文件

Question

我已尝试过每条路径，但无法找到文件路径。

public class JobOrderGenerator {

    private File file = new File("/resources/Shop-Order.xlsx");
    private int sheetNumber = 0;

    public JobOrderGenerator(List<ShopOrder> shopOrder) throws InvalidFormatException, IOException {

        for (ShopOrder shopOrder1 : shopOrder) {

            writeToSpecificCell(2, 1, sheetNumber, shopOrder1.getPo_number()); //Po Number
            writeToSpecificCell(7, 3, sheetNumber, shopOrder1.getPo_number()); //Part Number
            LocalDate date = shopOrder1.getPo_due_date();
            String dateToString = date.toString();
            writeToSpecificCell(1, 2, sheetNumber, dateToString); //Due_Date
            writeToSpecificCell(7, 5, sheetNumber, Integer.toString(shopOrder1.getPart_quantity())); //Quantity
            //writeToSpecificCell(1,2,sheetNumber, shopOrder.get); //Material
            writeToSpecificCell(8, 3, sheetNumber, shopOrder1.getPart_decription()); //Part Description
            //writeToSpecificCell(1,2,sheetNumber, shopOrder.getCustomer()); //Customer
            writeToSpecificCell(10, 1, sheetNumber, shopOrder1.getMachine_number()); //Machine

            sheetNumber++;

        }
    }

    void writeToSpecificCell(int rowNumber, int cellNumber, int sheetNumber, String value) throws InvalidFormatException, IOException {

        if(file.exists()){
            System.out.println("Was was found");
        } else {
            System.out.println("File was NOT found");
        }

每当我运行程序时，else语句都会运行

“找不到档案”

么？

Answer 1

执行File file = new File("/resources/Shop-Order.xlsx")时，JVM会在本地文件系统中查找该文件。由于您已将excel文件放在资源（部署在jar中）中，因此需要从类路径中获取它。 试试这个：

File file = new File(JobOrderGenerator.class.getResource("Shop-Order.xlsx").toURI());

另外，就像评论中提到的@dhh一样 - 文件名中有一个空格。

Answer 2

你无法直接引用File的路径。相反，你应该使用Classloader。

ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("Shop-Order.xlsx").getFile());

如果你想以静态的方式加载File，你必须稍微调整代码，因为getClass()方法不能从静态方法或块中调用非静态方法

ClassLoader classLoader = JobOrderGenerator.class.getClassLoader();
File file = new File(classLoader.getResource("Shop-Order.xlsx").getFile());