Xử lý file đơn giản

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package xulyfile;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

/**
 *
 * @author Thieu Mao
 */
public class XuLyFile {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        XuLyFile xlf = new XuLyFile();
    }

    public XuLyFile() {
        String strLeft, strRight, strCenter;
        strLeft = "<string1>";
        strRight = "<string2>";
        String[] strData = new String[100];
        int i = 0;
        File f = new File("vanban.txt");
        try {
            FileReader fr = new FileReader(f);
            BufferedReader br = new BufferedReader(fr);
            while ((strCenter = br.readLine()) != null) {
                strCenter = strLeft + " " + strCenter + " " + strRight;
                strData[i] = strCenter;
                i++;
            }
            br.close();
            fr.close();
        } catch (Exception ex) {
            System.out.println("Loi doc file!");
        }

        f = new File("vanban.txt");
        try {
            FileWriter fw = new FileWriter(f);
            BufferedWriter bw = new BufferedWriter(fw);
            for (int j = 0; j < i; j++) {
                System.out.println(strData[j]);
                bw.write(strData[j] + "\n");
            }
            bw.close();
            fw.close();
        } catch (Exception e) {
            System.out.println("Loi ghi file!");
        }
    }
}