Java 文件字节流

package homework;

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

public class T {

	public static void main(String[] args) {
		File file = new File("text.txt");
		FileOutputStream outputStream = null;
		try {
			outputStream = new FileOutputStream(file,true);
			//第一个参数为获取的文件 第二个参数默认false
			String aString = "太好啦！又能快乐地学习啦";
			byte b[] = aString.getBytes();
			outputStream.write(b);
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			try {
				outputStream.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		FileInputStream inputStream = null;
		try {
			inputStream = new FileInputStream(file);
			byte[] b = new byte[200];//创建缓冲区
			int len = inputStream.read(b);
			System.out.println(new String(b,0,len));
			//从0索引读到len 去掉多余空格
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			try {
				inputStream.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		
	}
}