文件的讀寫

 

package com.test2;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.Writer;

public class Demo6 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        try {
            File file = new File("F:/test.txt");
            PrintWriter pw = new PrintWriter(new FileWriter(file));
            System.out.println("請輸入內容:");
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            String str = br.readLine();
            pw.println(str);
            pw.flush();
            pw.close();
        }

        catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Demo6.readFile();
    }

    public static void readFile() {
        System.out.println("文件的輸出");
        File file = new File("F:/test.txt");
        BufferedReader br;
        try {
            br = new BufferedReader(new FileReader(file));
            String str = null;
            int line = 1;
            try {
                while ((str = br.readLine()) != null) {
                    System.out.println("line " + line + ": " + str);
                    line++;
                }
                br.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}