编写程序TextFileCopy.java，在测试方法中，将TextFileCopy.java复制为TextFileCopy.java.bak文件； 查看TextFileCopy.java.bak文

编写程序TextFileCopy.java，在测试方法中，将TextFileCopy.java复制为TextFileCopy.java.bak文件； 查看TextFileCopy.java.bak文件的内容，验证复制是否正确。

package com.xatu.IO;

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

public class TextFileCopy {
  public static void main(String[] args) {
	 Reader fr = null;
	 Writer fw = null;
	 try {
		 fr = new FileReader("TextFileCopy.java");
		 
		 fw = new FileWriter("TextFileCopy.java.bak");
		 
		 char[] cbuf = new char[100];
		 int realChars = 0;
		 while ((realChars = fr.read(cbuf)) != -1) {
			fw.write(cbuf, 0, realChars);
		}
		
	} catch (Exception e) {
		e.printStackTrace();	
    }finally {
		if(fr != null)
			try {
			fr.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		if(fw != null)
			try {
				fw.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
	}
  }
}

换成字节流可以复制音视频文件

package com.xatu.IO;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class BinFileCopy {
	public static void main(String[] args) {
		InputStream frs = null;
		OutputStream fws = null;
		try {
			frs = new FileInputStream("01_.avi");
			
			fws = new FileOutputStream("01_副_.avi");
			
			byte[] b = new byte[100];
			int realCharBin = 0;
			while ((realCharBin=frs.read(b)) !=-1) {
				fws.write(b,0, realCharBin);
			}
			
		} catch (Exception e) {
		e.printStackTrace();	
		}finally {
			if(frs != null)try {
				frs.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			if(fws != null)try {
				fws.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
			}
}