Java Powermockito在存根FileOutputStream时抛出OutOfMemory异常

我不知道为什么会发生这种情况，但是当我运行测试代码时，我得到了一个OutOfMemoryException

测试：

测试类别：

public class UploadBulkRefundAction extends MossoAction {
    @Override
public ActionForward execute(ActionMapping mapping, ActionForm f, HttpServletRequest request, HttpServletResponse response) throws     Exception {
        BulkRefundsForm bulkRefundsForm=(BulkRefundsForm)f;
        File tempFile = storeExcelSheetInATempFile(bulkRefundsForm);
        return null;
    }

    private File storeExcelSheetInATempFile(BulkRefundsForm bulkRefundsForm) throws IOException {
        InputStream inputStream=null;
        FileOutputStream outputStream=null;
        try{
            File tempFile = File.createTempFile("tomcat-", "bulkrefunds.xlsx");
            inputStream = bulkRefundsForm.getSpreadsheetFile().getInputStream();
            outputStream = new FileOutputStream(tempFile);
            IOUtils.copy(inputStream, outputStream);
            return tempFile;
        }finally{
            IOUtils.closeQuietly(inputStream);
            IOUtils.closeQuietly(outputStream);
        }
    }
}

包含一个循环，如果

InputStream

无法从其

read（）

方法返回值'-1'，该循环将永远不会终止

---

我猜您的mock默认情况下将从返回类型为

int

的方法返回“0”，因此您的测试代码将进入一个无限循环，该循环无休止地将4k大小的字节数组写入

OutputStream

非常感谢。我用下面的附加行修复了它：PowerMockito.when（is.read（any（byte[].class）））。然后返回（1，-1）；不知道我怎么会错过它。。

public class UploadBulkRefundAction extends MossoAction {
    @Override
public ActionForward execute(ActionMapping mapping, ActionForm f, HttpServletRequest request, HttpServletResponse response) throws     Exception {
        BulkRefundsForm bulkRefundsForm=(BulkRefundsForm)f;
        File tempFile = storeExcelSheetInATempFile(bulkRefundsForm);
        return null;
    }

    private File storeExcelSheetInATempFile(BulkRefundsForm bulkRefundsForm) throws IOException {
        InputStream inputStream=null;
        FileOutputStream outputStream=null;
        try{
            File tempFile = File.createTempFile("tomcat-", "bulkrefunds.xlsx");
            inputStream = bulkRefundsForm.getSpreadsheetFile().getInputStream();
            outputStream = new FileOutputStream(tempFile);
            IOUtils.copy(inputStream, outputStream);
            return tempFile;
        }finally{
            IOUtils.closeQuietly(inputStream);
            IOUtils.closeQuietly(outputStream);
        }
    }
}