package cn.jbit.inputstream;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {

        try {
            
 
// 創建一個FileInputStream對象

            File file = new File("D:\\c.txt");

            FileInputStream fileInputStream = new FileInputStream(file);
            byte[] bs = new byte[100];
            
            // 將文件的內容讀入 數組中
            fileInputStream.read(bs);
            
            // 將byte數組轉成String
 

            String str = new String(bs);
            System.out.println(str);

            // 寫入文件
            FileOutputStream fileOutputStream = new FileOutputStream(
                    "D:\\c1.txt", true);
            fileOutputStream.write(bs, 0, bs.length);

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

    }

}

Java中使用字節流類讀取文本內容