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JAVA – Input / Output

Author: admin - Posted: 26/11/19 - Update: 26/11/19

Luồng đọc ghi
Input và Reader
Output và Write

package Test;

import java.io.*;

public class Main{
    public static void main(String[] args) {
        File f = new File("C:\\Users\\Duy\\Desktop\\liststudent.txt");
        String ftxt = "Student ID, Student Name, Address, Phone \n";
        if (f.canWrite()) {
            try {
                FileOutputStream fos = new FileOutputStream(f);
                DataOutputStream dos = new DataOutputStream(fos);
                for (Student st : arrayList) {
                    String s = st.getStudentID() + "," + st.getStudentName() + "," + st.getAddress() + "," + st.getPhone() + " \n";
                    ftxt = ftxt + s;
                }
                dos.writeBytes(ftxt);
                dos.close();
                fos.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (f.canRead()) {
            try {
                FileInputStream fis = new FileInputStream(f);
                DataInputStream dis = new DataInputStream(fis);
                String line = "";
                while ((line = dis.readLine()) != null) {
                    ftxt += line + "\n";
                    String[] strs = line.split("-");
                    Student s = new Student(strs[0], Integer.parseInt(strs[1]),
                            Integer.parseInt(strs[2]));
                    arr.add(s);
                }
                dis.close();
                fis.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

package Test;

import java.io.*;

public class Main{

public static void main(String[] args) {

File f = new File("C:\\Users\\Duy\\Desktop\\liststudent.txt");

String ftxt = "Student ID, Student Name, Address, Phone \n";

if (f.canWrite()) {

try {

FileOutputStream fos = new FileOutputStream(f);

DataOutputStream dos = new DataOutputStream(fos);

for (Student st : arrayList) {

String s = st.getStudentID() + "," + st.getStudentName() + "," + st.getAddress() + "," + st.getPhone() + " \n";

ftxt = ftxt + s;

}

dos.writeBytes(ftxt);

dos.close();

fos.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

if (f.canRead()) {

try {

FileInputStream fis = new FileInputStream(f);

DataInputStream dis = new DataInputStream(fis);

String line = "";

while ((line = dis.readLine()) != null) {

ftxt += line + "\n";

String[] strs = line.split("-");

Student s = new Student(strs[0], Integer.parseInt(strs[1]),

Integer.parseInt(strs[2]));

arr.add(s);

}

dis.close();

fis.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

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