i have a class which reads the list available in particular location,
the following is my code,
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class ExceptionInFileHandling {
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void GetDirectory(String a_Path, List a_files, List a_folders) throws IOException {
try {
File l_Directory = new File(a_Path);
File[] l_files = l_Directory.listFiles();
for (int c = 0; c < l_files.length; c++) {
if (l_files[c].isDirectory()) {
a_folders.add(l_files[c].getName());
} else {
a_files.add(l_files[c].getName());
}
}
} catch (Exception ex){
ex.printStackTrace();
}
}
@SuppressWarnings("rawtypes")
public static void main(String args[]) throws IOException {
String filesLocation = "asdfasdf/sdfsdf/";
List l_Files = new ArrayList(), l_Folders = new ArrayList();
GetDirectory(filesLocation, l_Files, l_Folders);
System.out.println("Files");
System.out.println("---------------------------");
for (Object file : l_Files) {
System.out.println(file);
}
System.out.println("Done");
}
}
in this the file path can be passed as argument and that should be taken up based on the OS,
filePath.replaceAll("\\\\|/", "\\" + System.getProperty("file.separator"))
is this correct?
// Don't do this
filePath.replaceAll("\\\\|/", "\\" + System.getProperty("file.separator"))
import java.nio.file.*;
Path path = Paths.get(somePathString);
// Here is your system independent path
path.toAbsolutePath();
// Or this works too
Paths.get(somePathString).toAbsolutePath();
// You can also input a String that has a proper file seperator like so
String filePath = "SomeDirectory" + File.separator;
// Then call your directory method
try{
ExceptionInFileHandling.GetDirectory(filePath, ..., ...);
} catch (Exception e){}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void GetDirectory(String a_Path, List a_files, List a_folders) throws IOException {
try {
// File object is instead constructed
// with a URI by using Path.toUri()
// Change is done here
File l_Directory = new File(Paths.get(a_Path).toUri());
File[] l_files = l_Directory.listFiles();
for (int c = 0; c < l_files.length; c++) {
if (l_files[c].isDirectory()) {
a_folders.add(l_files[c].getName());
} else {
a_files.add(l_files[c].getName());
}
}
} catch (Exception ex){
ex.printStackTrace();
}
}
在调用File构造函数时,也可以在Windows上使用正斜杠作为目录分隔符。
why you are not adding java defined file separator instead of creating a string then replacing all. try it like
String filesLocation = "asdfasdf"+File.separator+"sdfsdf"+File.separator;
The answer from you should be correct. There is another similiar thread with answer :
First, you should not used relative path like asdfasdf/sdfsdf/
. It's a big source of bugs as your path depends on your working directory.
That thing said, your replaceAll is quite good but it can be improved like this :
filePath.replaceAll(
"[/\\\\]+",
Matcher.quoteReplacement(System.getProperty("file.separator")));
Using quoteReplacement
is adviced in replaceAll
documentation
Returns a literal replacement String for the specified String. This method produces a String that will work as a literal replacement s in the appendReplacement method of the Matcher class. The String produced will match the sequence of characters in s treated as a literal sequence. Slashes ('\\') and dollar signs ('$') will be given no special meaning.
You could generate a Path
object from the passed argument. Then you would not need to handle the file separator on your own.
public static void main(String[] args) {
Path path = Paths.get(args[0]);
System.out.println("path = " + path.toAbsolutePath());
}
The code is able to handle following passed arguments.
You need to use java.io.File.separatorChar
to The system-dependent default name-separator character.
String location = "usr"+java.io.File.separatorChar+"local"+java.io.File.separatorChar;
org.apache.commons.io.FilenameUtils包含许多有用的方法,例如separatorsToSystem(String path)根据您使用的操作系统转换给定路径中的分隔符。
使用以下方法了解OS文件分隔符,然后使用此方法替换所有以前的分隔符。
System.getProperty("file.separator");
Why you just dont use "/". It is acceptable for both linux and windows as path seperator.
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