[Java] 檔案讀寫

FileReader & FileWriter

原始碼

1. import java.io.BufferedReader; 
2. import java.io.BufferedWriter; 
3. import java.io.FileReader; 
4. import java.io.FileWriter; 
5.  
6. public class FileReadWrite1 { 
7.  
8.    public static void main(String[] args) throws Exception { 
9.  
10.        FileReader fReader = new FileReader("input.txt"); 
11.        FileWriter fWriter = new FileWriter("output.txt"); 
12.  
13.        /* Buffered 提供單行讀取的功能 */ 
14.        BufferedReader bReader = new BufferedReader(fReader); 
15.        BufferedWriter bWriter = new BufferedWriter(fWriter); 
16.  
17.        String line; 
18.        while ((line = bReader.readLine()) != null) { 
19.            System.out.println(line); 
20.            bWriter.write(line); 
21.            bWriter.newLine(); 
22.        } 
23.  
24.        bReader.close(); 
25.        bWriter.close(); 
26.    } 
27. } 

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

public class FileReadWrite1 {

    public static void main(String[] args) throws Exception {

        FileReader fReader = new FileReader("input.txt");
        FileWriter fWriter = new FileWriter("output.txt");

        /* Buffered 提供單行讀取的功能 */
        BufferedReader bReader = new BufferedReader(fReader);
        BufferedWriter bWriter = new BufferedWriter(fWriter);

        String line;
        while ((line = bReader.readLine()) != null) {
            System.out.println(line);
            bWriter.write(line);
            bWriter.newLine();
        }

        bReader.close();
        bWriter.close();
    }
}

InputStreamReader & OutputStreamWriter

原始碼

1. import java.io.BufferedReader; 
2. import java.io.BufferedWriter; 
3. import java.io.FileInputStream; 
4. import java.io.FileOutputStream; 
5. import java.io.InputStreamReader; 
6. import java.io.OutputStreamWriter; 
7.  
8. public class FileReadWrite2 { 
9.  
10.    public static void main(String[] args) throws Exception { 
11.  
12.        InputStreamReader fReader = new InputStreamReader( 
13.            new FileInputStream("input.txt"), "UTF8" 
14.        ); 
15.        OutputStreamWriter fWriter = new OutputStreamWriter( 
16.            new FileOutputStream("output.txt"), "UTF8" 
17.        ); 
18.  
19.        /* Buffered 提供單行讀取的功能 */ 
20.        BufferedReader bReader = new BufferedReader(fReader); 
21.        BufferedWriter bWriter = new BufferedWriter(fWriter); 
22.  
23.        String line; 
24.        while ((line = bReader.readLine()) != null) { 
25.            System.out.println(line); 
26.            bWriter.write(line); 
27.            bWriter.newLine(); 
28.        } 
29.  
30.        bReader.close(); 
31.        bWriter.close(); 
32.    } 
33. } 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class FileReadWrite2 {

    public static void main(String[] args) throws Exception {

        InputStreamReader fReader = new InputStreamReader(
            new FileInputStream("input.txt"), "UTF8"
        );
        OutputStreamWriter fWriter = new OutputStreamWriter(
            new FileOutputStream("output.txt"), "UTF8"
        );

        /* Buffered 提供單行讀取的功能 */
        BufferedReader bReader = new BufferedReader(fReader);
        BufferedWriter bWriter = new BufferedWriter(fWriter);

        String line;
        while ((line = bReader.readLine()) != null) {
            System.out.println(line);
            bWriter.write(line);
            bWriter.newLine();
        }

        bReader.close();
        bWriter.close();
    }
}