How can I get a Java print file?

import java.io.*;

Never import the full package. It is considered bad practice to do so. Instead, import what you need and only what you need.

Instead of just reading a Java print file then printing it, why don't you create a method that reads all line of a file and returns a list of all the lines? This way, you can do more with the result:

public static List getAllLines(File file) throws FileNotFoundException, IOException {
    FileReader fr = new FileReader(file);
    BufferedReader br = new BufferedReader(fr);
    String buffer;
    String fulltext="";
    while ((buffer = br.readLine()) != null) {
        System.out.println(buffer);
        fulltext += buffer;
    }
    br.close();
    fr.close();
}
I am especially concerned with resource leaks.
Since Java 7, there is such a thing as a try-with-resources statement, which automatically closes the reader when an exception occurs, which you are not doing here. Your current code has memory leaks!
With some other improvements:
public static List readAllLines(File file) {
    List result = new LinkedList<>();
    try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
        for (String current = reader.readLine(); current != null; current = reader
                .readLine()) {
            result.add(current);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return result;
}

By the way, this is actually the code I use often to read all lines of a file.