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How to read a textfile and output it , BufferedReader & Scanner

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Here's a demo I wrote some time ago to read a file and output it in the console. I've created 2 versions. One that uses the "Scanner object" and the other the "BufferedReader object" to read the text files from disk.

Both examples of mine work, but the Scanner version is preferred.

BufferedReader version:

PLAIN TEXT
JAVA:
  1. public class ReadFile {
  2. public static void main(String[] args) {
  3. ReadFile rf = new ReadFile();
  4. rf.readFile();
  5. }
  6. public void readFile(){
  7. try {
  8. FileReader fr = new FileReader("c:\\input.txt"); // read a file
  10. String tmp;
  11. tmp = br.readLine(); // read first line of file.
  12. while(tmp != null){ // read a line until end of file.
  13. System.out.println("" + tmp);
  14. tmp = br.readLine();
  15. }
  16. br.close();
  17. } catch (FileNotFoundException e) {
  18. e.printStackTrace();
  19. } catch (IOException e) {
  20. e.printStackTrace();
  21. }
  22. }
  23. }


Scanner version:

PLAIN TEXT
JAVA:
  1. public class ReadLineDemo {
  2. public static void main(String[] args){
  3. ReadLineDemo EDS = new ReadLineDemo();
  4. EDS.readFile();
  5. }
  6. public void readFile(){
  7. String str;
  9. try {
  10. fr = new FileReader("c:\\input.txt");
  11. System.out.println("begin");
  12. Scanner sc = new Scanner(fr);
  13. while(sc.hasNext()){
  14. str = sc.nextLine();
  15. System.out.println(str);
  16. }
  17. }
  19. e.printStackTrace();
  20. }
  21. }
  22. }


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April 14th, 2008 in Java |