package com.itheima;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 5、 编写程序拷贝一个文件, 尽量使用效率高的方式.
 * 
 * @author 2811671413@qq.com
 * 
 *     1、源文件不能读取到的情况。 2、目的文件创建失败的情况 3、文件锁问题 4、字符乱码问题
 */

public class Test5 {

 public static void main(String[] args) throws IOException {
  String src_file = "D:/java/java.doc";
  String des_file = "D:/java/java_copy.doc";
  
  copyFile(src_file, des_file);
  
  System.out.println("OK!");
 }

 public static void copyFile(String src, String des) throws IOException {
  BufferedInputStream inBuff = null;
  BufferedOutputStream outBuff = null;
  
  try {
   // 新建文件输入流并对它进行缓冲
   inBuff = new BufferedInputStream(new FileInputStream(src));

   // 新建文件输出流并对它进行缓冲
   outBuff = new BufferedOutputStream(new FileOutputStream(des));

   // 缓冲数组
   byte[] b = new byte[1024 * 5];
   int len;
   while ((len = inBuff.read(b)) != -1) {
    outBuff.write(b, 0, len);
   }
   // 刷新此缓冲的输出流
   outBuff.flush();
  } finally {
   // 关闭流
   if (inBuff != null)
    inBuff.close();
   if (outBuff != null)
    outBuff.close();
  }

 }
}

try {
      File inputFile = new File(args[0]);
      if (!inputFile.exists()) {
        System.out.println("源文件不存在，程序终止");
        System.exit(1);
      }
      File outputFile = new File(args[1]);
      InputStream in = new FileInputStream(inputFile);
      OutputStream out = new FileOutputStream(outputFile);
      byte date[] = new byte[1024];
      int temp = 0;
      while ((temp = in.read(date)) != -1) {
        out.write(date);
      }
      in.close();
      out.close();
    } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }