How do get this to read one line at a tme?

King Nothing · Dec 11th 2017

Code

File targetFile = new File(getPath() + "/fred.txt");
            String mama = Utils.FileUtils.readStringFromFile(targetFile);
            try {
                    //model definition file
                    BufferedReader br = new BufferedReader(new FileReader(targetFile));
                    String line = "";
                    while((line = br.readLine()) != null){
                        String[] sp = line.split(":");
                        if (sp.length == 2){
                            switch(sp[0]){
                                case "Thing":
                                    mama = sp[1];
                                break;
                            }
                        }
                    }
                } catch (FileNotFoundException ex) {
                    ex.printStackTrace();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }

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currently it reads the WHOLE file at once,
the text file is set up like

I'm a text:
I'm another text:
I'm just a nother text:

any help would be apprciated.

red51 · Dec 11th 2017

Do you really have to read the text file line by line (e.g. because it's an extremely huge text file)? Or do you just want to check the lines individually and look for a specific line? In this case you could read the whole file by using the Utils.FileUtils.readStringFromFile(file); function, and split the text by the newline escape sequence \n, for example:

Java

File targetFile = new File(getPath() + "/fred.txt");


//Read whole file content
String text = Utils.FileUtils.readStringFromFile(targetFile);


//Now split the lines, this returns an array of String. Every
//String represents a new line
String[] lines = text.split("\n");


//Now you can iterate through the lines
for(int i = 0; i < lines.length; i++){
    String line = lines[i];
    System.out.println("Line "+i+": "+line);


    //You can do some checks, for example:
    if(line.contains("Thing")){
        //do something
    }
}

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Output:

Code

Line 0: I'm a text
Line 1: I'm another text
Line 2: I'm just another text

Of course you could grab a specific line directly, e.g. if you want to access line 53, you could just access it from the lines array: String line53 = lines[52]; (it's array index 52 ofc)

However, if you really want to read every single line individually without having to load the rest of the text (this makes sense if it is a really huge text file), you can use a BufferedReader, like in the code you've posted.

Minotorious · Dec 11th 2017

Java

File settingsTxt = new File(getPath() + "/assets/settings.txt");
        if (settingsTxt.exists()){
            String content = Utils.FileUtils.readStringFromFile(settingsTxt);
            if(content != null && !content.isEmpty()){
                String[] lines = content.split("\r\n|\n|\r");
                String[][] settings = new String[lines.length][2];
                int linecount = 0;
                for (String line : lines) {
                    String[] cline = line.split(":", 2);
                    if (cline.length == 2){
                        settings[linecount][0] = cline[0];
                        settings[linecount][1] = cline[1];
                        linecount += 1;
                    }
                }
            }
        }

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King Nothing · Dec 11th 2017

its a bunch of Quotes that is in a text file. i didn't feel the need to have a database

"Merry Christmas" <- line one
"You smell like fart" <-- line two
I'm trying to make it say a random Quote after a command is issued.
and i thought having a text file it would be eaiser to add/delete quotes instead of having to re-compile the plugin every time.

King Nothing · Dec 11th 2017

thanks it looked like i was on the right path... but it jusr read the while thing at once,. that is how i used to read text files in BASIC, Java is different.

LordFoobar · Dec 25th 2017

If the file is only a few hundred Kb or less, just load it entirely and keep each line in an ArrayList<String>. Because the cost of reading a file vs keeping a few Kb in memory is really an obvious choice, here.

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