java IO（二）大文件复制

package cn.sasa.demo3;

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

public class CopyDemo {
    public static void main(String[] args) {
        long start = System.currentTimeMillis();
        /**
         * 复制文件
         */
        FileInputStream input = null;
        FileOutputStream output = null;
        try {
             input = new FileInputStream("D:\sasa\Java\WebApiCode.zip");
             output = new FileOutputStream("D:\sasa\abc.zip");
             byte[] buffer = new byte[1024 * 1024];
             int len = 0;
             while((len = input.read(buffer)) != -1) {
                 output.write(buffer);
             }
        }catch(IOException e) {
            System.out.println(e.getMessage());
            System.out.println("复制失败");
        }finally {
            try {
                if(input != null)
                    input.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                System.out.println(e.getMessage());
                System.out.println("资源释放失败");
            }
            try {
                if(output != null)
                    output.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                System.out.println(e.getMessage());
                System.out.println("资源释放失败");
            }
        }
        long end = System.currentTimeMillis();
       System.out.println(end - start);
    }
}