get string from a text file

[Kruptein]

Is it possible to let java grab a string from a textfile?

f.e.:
config.txt
editor: gedit
name: Kruptein
...


Is it possible that I can grab the string gedit if I want to know which editor is set as default?

[Fubarable]

Sure, just read through the text file. After reading each line, see if it contains editor: and extract the next token. One way to do this would be to use a Scanner object and use a while (scanner.hasNextLine()) to extract the nextLine() from the file. Then you could use a String method to see if the read line contains "name:", if so, split the line, with String#split(...) and extract your gedit string.

[Kruptein]

Sorry but I only know java for say 2 days.

I've found this:

logdialtext = "Where is the configurationfile located? \n(whole the path)";
String configpath = WelcomeMsg.showInputDialog(logdialtext);
Scanner sc = new Scanner(configpath);
sc.findInLine("editor:");
if (sc.hasNext()) {
WelcomeText.setText(sc.next());
} else {
WelcomeText.setText("Error!");
}

config.ssa
editor: gedit
filepath: /home/darragh/Documenten/D_MENU/files

When I insert the path in the dialog,
it just shows the path I insert into the WelcomeText; textbox

What did I do wrong?

I got this script from: java2s.com/Tutorial/Java/0180__File/Searchingforthespecifiedpatternwithinthenextlineof text.htm

[Kruptein]

I think the problem is that it doesn't read the content of configpath, but only the name,

How can I solve this?

Kruptein

[RamyaSivakanth]

Hi,
Use it like this and catch the "File Not Found Exception"

Scanner sc = new Scanner(new File(configpath));

[Kruptein]

Okay now I've the foll. code:

private void ConfigActionPerformed(java.awt.event.ActionEvent evt) {                                       
        try {
            logdialtext = "Where is the configurationfile located? \n(whole the path)";
            String configpath = WelcomeMsg.showInputDialog(logdialtext);
            Scanner sc = new Scanner(new File(configpath));
            sc.findInLine("editor:");
            if (sc.hasNext()) {
                WelcomeText.setText(sc.next());
            } else {
                WelcomeText.setText("Error!");
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(D_MENU.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

No if I give the path to the config file
it only returns #*FileName=*config.ssa# in my textbox
config.ssa

#*FileName=*config.ssa#
editor: gedit
filepath: /home/darragh/Documenten/D_MENU/files

It still doesn't give me the string after editor... :(

[RamyaSivakanth]

Still u have not given the complete code.If u give it in "if" it will do only one statement parsing know? How can you get all?

U should use while loop or for parsing the entire file know?



Be specific with the requirement and give the full code with comments.Then only people can get what u want.

[Kruptein]

I can't be more specific, I want to get the string behind editor:

private void ConfigActionPerformed(java.awt.event.ActionEvent evt) {                                       
        try {
            logdialtext = "Where is the configurationfile located? \n(whole the path)";   //logdialtext is a dialogbox
            String configpath = WelcomeMsg.showInputDialog(logdialtext);
            Scanner sc = new Scanner(new File(configpath));
            if(sc.findInLine("editor:")) {
                if (sc.hasNext()) {
                    WelcomeText.setText(sc.next()); //WelcomeText = TextBox.
                } else {
                    WelcomeText.setText("Error!");
                }
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(D_MENU.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

Like you can see in the code, I tried the if statement to see if it can find the word editor,
but Netbeans give me the foll. error:
Incompatible types, required: boolean
(error about the line if(sc.findInLine("editor:")) )

[RamyaSivakanth]

One small correction.

findinLine never returns boolean .So u can't use with if ..

This method will set the pointer to read only if the text has "editor"

Check it is working or not.

One more doubt for me is print the configpath in S.O.P
and send the textfile also for me.Let me have a look.

private void ConfigActionPerformed(java.awt.event.ActionEvent evt) {
try {
logdialtext = "Where is the configurationfile located? \n(whole the path)";
String configpath = WelcomeMsg.showInputDialog(logdialtext);
Scanner sc = new Scanner(new File(configpath));
sc.findInLine("editor:");
if (sc.hasNext()) {
WelcomeText.setText(sc.next());
} else {
WelcomeText.setText("Error!");
}
} catch (FileNotFoundException ex) {
Logger.getLogger(D_MENU.class.getName()).log(Level .SEVERE, null, ex);
}
}

[Kruptein]

Okay so I currently have:

private void ConfigActionPerformed(java.awt.event.ActionEvent evt) {                                       
        try {
            logdialtext = "Where is the configurationfile located? \n(whole the path)";
            //String configpath = WelcomeMsg.showInputDialog(logdialtext);
            String configpath = "/home/darragh/Documenten/D_MENU/files/config.ssa";
            Scanner sc = new Scanner(new File(configpath));
            sc.findInLine("editor:");
            if (sc.hasNext()) {
                WelcomeText.setText(sc.next());
            } else {
                WelcomeText.setText("Error!");
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(D_MENU.class.getName()).log(Level .SEVERE, null, ex);
        }
    }

and config.ssa:

#*FileName=*config.ssa#
editor: gedit
filepath: /home/darragh/Documenten/D_MENU/files

I'm trying to get the string after editor: (in this case gedit)

Can you say how I should do this

(Sorry but I didn't understand whole your answer)

[RamyaSivakanth]

As Fubarable said ,I have written a small code here.Please go thru whether it fits ur requirement and modify as per ur need.
Currently this below code only retreives the editor details

1.Iam having a file "Test.ssa and having contents as u said like this below

editor: gedit
name: Kruptein
editor :fff
name:Ramya
editor:
name:Ranjani

2.I kept the above file in the same directory as of java for simplicity sake.
See the code for retreival of editor information only.

import java.io.*;
import java.util.*;



public class Test {

	public static void main(String[] args) throws Exception
	{

            Scanner sc = new Scanner(new File("Test.ssa"));
			String arr[];
                 while (sc.hasNextLine())
				 {
                    String input = sc.nextLine();
                    if(input.indexOf("editor") !=-1)
					{
						arr = input.split(":");
						System.out.println(arr[1]);
					}//if
				}

	}//main
} //class

[Kruptein]

Thanks! that solved my problem :),
Sorry if I was to annoying ;p