package inputstream.cn;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

/*
 * 改進版 4
 * 使用read()通過循環讀取
 * byte[] b = new byte[(int)f.length()];
            for (int i = 0; i < b.length; i++) {
                    b[i] = (byte)is.read();
            }
 */
public class
 
 InputStreamDemo4 {
        public static void main(String[] args) throws Exception {
            //使用file 找到一個文件
            File f = new File("d:"+File.separator+"test.txt");
            //通過子類實例化父類
            InputStream is =new FileInputStream(f);
            //開辟一個1024的字節數組，把所有的類容讀到此數組中
            byte
 
[] b = new byte[(int)f.length()];
            for (int i = 0; i < b.length; i++) {
                    b[i] = (byte)is.read();
            }
            //關閉輸入流
            is.close();
            //打印讀的數據,將byte類型轉換為string類型輸出
            System.out.println(new String(b));
            
        }
    }
 

字節輸入流-InputStream demo4