如何从D：目录加载文件 [英] How to load a file from D: Directory

问题描述

我在c：//images/flower.jpg中有一些图像文件



我使用下面的代码来读取文件的输入流。

 InputStream in = null; 
 FileInputStream fis =  new  FileInputStream（  c ：//images/flower.jpg）; 
 in = fis; 
 fis.close（）; 

但是流总是返回Null。请帮我看看文件流。



谢谢，

Baskar G

解决方案

尝试删除之后的一个斜杠c：

来自

 FileInputStream fis =  new  FileInputStream（  c：/ /images/flower.jpg）; 

to

 FileInputStream fis =  new  FileInputStream（  c：/images/flower.jpg）; 

我的猜测是你认为正斜杠（/）是一个需要加倍的转义字符。它没有。



在Microsoft系统上，您可以使用正斜杠或反斜杠。背斜线需要加倍;不要使用正斜杠。



将您的代码更改为以下任意一个：

 FileInputStream fis =  new  FileInputStream（  c： /images/flower.jpg）; 

或

 FileInputStream fis =  new  FileInputStream（  c：\\images\\flower.jpg）; 

你也可以避免通过在字符串前加上 @ 前缀加倍反斜杠。

 FileInputStream fis =  new  FileInputStream（ @  c：\ imagesm \\flower.jpg）; 

Hi,

I have some image files in c://images/flower.jpg

I have used following code to read the input stream of the file.

InputStream in = null;
FileInputStream fis = new FileInputStream("c://images/flower.jpg");
in  = fis;
fis.close();

But stream always returns Null . Please help me to read the file stream .

Thanks,
Baskar G

解决方案

Try to remove one of the slashes after c:
From

FileInputStream fis = new FileInputStream("c://images/flower.jpg");

to

FileInputStream fis = new FileInputStream("c:/images/flower.jpg");

My guess is that you consider the forward slash ("/") to be an escape character that needs to be doubled. It doesn't.

On Microsoft systems, you can use either forward or back slashes. Back slashes need to be doubled; forward slashes do not.

Change your code to either one of:

FileInputStream fis = new FileInputStream("c:/images/flower.jpg");

or

FileInputStream fis = new FileInputStream("c:\\images\\flower.jpg");

You can also avoid the backslashes-doubling by prefixing your string with an @.

FileInputStream fis = new FileInputStream(@"c:\images\flower.jpg");

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