输出输入流，的应用

package com;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class X {
	public static void main(String[] args) {
	
		
	

	


/*
 * 第一个读取该文件的字节大小
 */


	/*int a = 0;

	FileInputStream i = null;

	try
	{
		i = new FileInputStream("G:\JAVA\视频\04243\cce.txt");
		
	}catch(
	FileNotFoundException e)
	{
		System.out.println("找不到指定的文件");
		System.exit(-1);
	}try
	{
		long n = 0;
		while ((a = i.read()) != -1) {
			System.out.println((char) a);
			;
			n++;
		}

		i.close();
		System.out.println("

共读取了" + n + "个字节");
	}catch(
	IOException e1)
	{ System.out.println("读取文件时出现异常"); System.exit(-1); }
*/


/*
 * 
 * 第二个复制原有文件
 * */	
/*		int a2 = -1;
	FileInputStream i = null;
	FileOutputStream o = null;
	try {
		i = new FileInputStream("G:\JAVA\视频\04243\cce.txt");
		o = new FileOutputStream("G:\JAVA\视频\04243\fileNew.txt");

		while ((a2 = i.read()) != -1) {
			o.write(a2);
		}

	} catch (FileNotFoundException e) {
			System.out.println("找不到指定文件");
			System.exit(-1);
	} catch (IOException e) {
			System.out.println("文件复制出错");
			System.exit(-1);
	}
	System.out.println("文件成功复制");
}
}*/	

/*
 * 第三读取文件内容
 * */

/*FileReader f = null;
int i = 0;
try {
	f =new FileReader("G:\JAVA\视频\04243\cce.txt");
while ((i = f.read())!= -1) {
	System.out.println((char)i);
}
f.close();
} catch (FileNotFoundException e) {
	System.out.println("文件未找到");
	System.exit(-1);
} catch (IOException e) {
	System.out.println("读取文件时出现异常");
	System.exit(-1);
	
}*/
/*
 * 第四自动打创建一个unicode000.dat文件 并且输入55555个字符。
 * 
 * */
/*	FileWriter we = null;
try {
	we = new FileWriter("G:\JAVA\视频\04243\unicode000.dat");
	  for (int ir = 1; ir <= 55555; ir++) {
			we.write(ir);
   }
} catch (IOException e) {
	System.out.println("写入文件出错 !");
	System.exit(-1);
	
}*/

/*
 * 第五个取50个0-1之间的随机数打印到文件中并显示在控制台上
 * */
/*try {
	BufferedWriter b = new BufferedWriter(new FileWriter("G:\JAVA\视频\04243\cce.txt"));
	BufferedReader r = new BufferedReader(new FileReader("G:\JAVA\视频\04243\cce.txt"));
	String a = null;
	for (int i = 0; i < 50; i++) {
		a = ""+ Math.random();//随机数0-1之间的
		//b.write(a);这两个是一样的
		b.append(a);//等同于上面
		b.newLine();//换行
	}
	b.flush();
	
	while ((a = r.readLine())!= null) {
		System.out.println(a);
	}
	r.close();
	b.close();
	
} catch (IOException e) {
	
}*/
/*
 * 第六个做标记
 * */

/*try {
	FileInputStream f = new FileInputStream("G:\JAVA\视频\04243\cce.txt");
	BufferedInputStream s = new BufferedInputStream(f);
	int c = 0;
	System.out.println((char)s.read());
	System.out.println((char)s.read());
	
	System.out.println("标记位置");
	s.mark(33);
	for (int i = 0; i < 10 && (c = s.read())!= -1; i++) {
		System.out.println((char)c);
	}
	System.out.println();
	System.out.println("回到mark标记的那个地方");
	s.reset();
	for (int i = 0; i < 10 && (c = s.read())!= -1; i++) {
		System.out.println((char)c);
		s.close();
	}
} catch (FileNotFoundException e) {


} catch (IOException e) {
	
} */

	}
}