FileInputStream doesn't work with the relative path [closed]

问题

I tried to create an object from FileInputStream and pass the relative value of a file to its constructor, but it doesn't work properly and threw a FileNotFoundException

try {
   InputStream is = new FileInputStream("/files/somefile.txt");
} catch (FileNotFoundException ex) {
   System.out.println("File not found !");
}

回答1:

The / at the start will make the path absolute instead of relative.

Try removing the leading /, so replace:

InputStream is = new FileInputStream("/files/somefile.txt");

with:

InputStream is = new FileInputStream("files/somefile.txt");

If you're still having trouble, try making sure the program is running from where you think by checking the current directory:

System.out.println(System.getProperty("user.dir"));

回答2:

The other posters are right the path you are giving is not a relative path. You could potentially do something like this.getClass().getResourceAsStream("Path relative to the current class"). This would allow you to load a file as a stream based on a path relative to the class from which you call it.

See the Java API for more details: http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#getResourceAsStream(java.lang.String)

回答3:

this is not a relative path, it is an absolute path.
If you are on Windows you need to add your drive letter before your path:

InputStream is = new FileInputStream("C:/files/somefile.txt");

windows doesn't support the / symbol as "root"

If you want to load a file thatt you'll put in your JAR, you need to use

getClass().getResource("path to your file");

getClass().getResourceAsStream("path to your file");

来源：https://stackoverflow.com/questions/14553292/fileinputstream-doesnt-work-with-the-relative-path

标签

java

filenotfoundexception

fileinputstream