package Stream;

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


public class OutStreamDemo01 {
	public static void main(String[] args) {
		//定義文件路徑，沒有該文件會(huì)自動(dòng)創(chuàng)建，如果路徑有文件夾，一定要有，不會(huì)自動(dòng)創(chuàng)建文件夾
		String filename = "e:"+File.separator+"a"+File.separator+"b.txt";
		File file = new File(filename);
		String str = "這些都將寫入文件中";
		byte[] b = str.getBytes();	//將字符串轉(zhuǎn)換成字節(jié)數(shù)
		OutputStream out = null;
		try {
			out = new FileOutputStream(file);	//實(shí)例化OutpurStream
		}catch(FileNotFoundException e){
			e.printStackTrace();
		}
		
		//寫入
		try {
			out.write(b);		//寫入
			out.close();		//關(guān)閉
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

package Stream;
import java.io.*;;
public class InputStreamDemo01 {
	public static void main(String[] args) {
		File file = new File("e:"+File.separator+"a"+File.separator+"b.txt");
		byte[] b = new byte[(int)file.length()];//定義byte字節(jié)的長度
		InputStream in = null;
		int len = 0;
		try {		//處理異常
			in = new FileInputStream(file);		//實(shí)例化FileInputstream類
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();		//輸出異常
		}
		try {
			len = in.read(b);		//讀取指定文件的內(nèi)容
			in.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(new String(b,0,len));//將字節(jié)數(shù)組轉(zhuǎn)化成字符串輸出指定文件從0開始到len字節(jié)結(jié)束
	}
}