How to read text file from File object in java

Question

I have this code which load the File from class path a=its text file and i want to read it to string what im using is :

 File file = new File(classLoader.getResource("sample.json").getFile());

i don't want to use:

file.getAbsolutePath();

how can i read this text file into String ?

UPDATE i found the solution , what do you think?

 ClassLoader classLoader = getClass().getClassLoader();
is = classLoader.getResourceAsStream("sample.json");
String txt = IOUtils.toString(is);

what relevance has `file.getAbsolutePath();` to do with your question? — Scary Wombat, Jun 05 '17 at 08:34
see https://docs.oracle.com/javase/7/docs/api/java/io/FileInputStream.html — Scary Wombat, Jun 05 '17 at 08:35
Possible duplicate of [How do I create a Java string from the contents of a file?](https://stackoverflow.com/questions/326390/how-do-i-create-a-java-string-from-the-contents-of-a-file) — OlivierM, Jun 05 '17 at 08:36
Load the file..parse the JSON...in for loop you can convert it to string... — Akshay, Jun 05 '17 at 08:37
Duplicate? There is a couple of similar questions on SO already! What's the difference? — iaforek, Jun 05 '17 at 08:37

anacron · Answer 1 · 2017-06-05T09:45:29.570

If you're using Java 8, you can use this for reading lines from a file:

List<String> lines = Files.readallLines(file.toPath());

Refer to the docs below:

https://docs.oracle.com/javase/8/docs/api/java/nio/file/Files.html#readAllLines-java.nio.file.Path-

https://docs.oracle.com/javase/8/docs/api/java/io/File.html#toPath--

EDIT:

For reading from a resource you got as an inputstream, you can use a combination of BufferedReader and InputStreamReader:

String getText() throws IOException{
    StringBuilder txt = new StringBuilder();
    InputStream res = getClass().getClassLoader().getResourceAsStream("sample.json");
    try (BufferedReader br = new BufferedReader(new InputStreamReader(res))) {
        String sCurrentLine;
        while ((sCurrentLine = br.readLine()) != null) {
            txt.append(sCurrentLine + "\n");
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return txt.toString();
}

Hope this helps!

score 0 · Answer 2 · answered Jun 05 '17 at 09:23

You can use the following code to read the file object.

public static void main(String[] args) {

        try (BufferedReader br = new BufferedReader(file)) {
            String sCurrentLine;
            while ((sCurrentLine = br.readLine()) != null) {
                System.out.println(sCurrentLine);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

How to read text file from File object in java

2 Answers2