how to parse this string in java?

"prefix/dir1/dir2/dir3/dir4/.."

how to parse the dir1,dir2 .. value out of the above string in JAVA?

The prefix here can be : /usr/local/apache2/resumes

-------------Problems Reply------------

If you want to split the String at the / character, the String.split method will work:

For example:

String s = "prefix/dir1/dir2/dir3/dir4";
String[] tokens = s.split("/");

for (String t : tokens)
System.out.println(t);

Output

prefix
dir1
dir2
dir3
dir4

Edit

Case with a / in the prefix, and we know what the prefix is:

String s = "slash/prefix/dir1/dir2/dir3/dir4";

String prefix = "slash/prefix/";
String noPrefixStr = s.substring(s.indexOf(prefix) + prefix.length());

String[] tokens = noPrefixStr.split("/");

for (String t : tokens)
System.out.println(t);

The substring without the prefix "slash/prefix/" is made by the substring method. That String is then run through split.

Output:

dir1
dir2
dir3
dir4

Edit again

If this String is actually dealing with file paths, using the File class is probably more preferable than using string manipulations. Classes like File which already take into account all the intricacies of dealing with file paths is going to be more robust.

In this case, why not use new File("prefix/dir1/dir2/dir3/dir4") and go from there?

String str = "/usr/local/apache/resumes/dir1/dir2";
String prefix = "/usr/local/apache/resumes/";

if( str.startsWith(prefix) ) {
str = str.substring(0, prefix.length);
String parts[] = str.split("/");
// dir1=parts[0];
// dir2=parts[1];
} else {
// It doesn't start with your prefix
}

String result;
String str = "/usr/local/apache2/resumes/dir1/dir2/dir3/dir4";
String regex ="(dir)+[\\d]";
Matcher matcher = Pattern.compile( regex ).matcher( str);
while (matcher.find( ))
{
result = matcher.group();
System.out.println(result);
}

output-- dir1 dir2 dir3 dir4

If it's a File, you can get the parts by creating an instanceof File and then ask for its segments.

This is good because it'll work regardless of the direction of the slashes; it's platform independent (except for the "drive letters" in windows...)

public class Test {
public static void main(String args[]) {
String s = "pre/fix/dir1/dir2/dir3/dir4/..";
String prefix = "pre/fix";
String[] tokens = s.substring(prefix.length()).split("/");
for (int i=0; i<tokens.length; i++) {
System.out.println(tokens[i]);
}
}

}

String.split(String regex) is convenient but if you don't need the regular expression handling then go with the substring(..) example, java.util.StringTokenizer or use Apache commons lang [1]. The performance difference when not using regular expressions can be a gain of 1 to 2 orders of magnitude in speed.

...
String str = "bla!/bla/bla/"

String parts[] = str.split("/");

//To get fist "bla!"
String dir1 = parts[0];

String s = "prefix/dir1/dir2/dir3/dir4"

String parts[] = s.split("/");

System.out.println(s[0]); // "prefix"
System.out.println(s[1]); // "dir1"
...

Category:java Views:0 Time:2009-06-04
Tags: string java

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