(I/O流)在100ms内桌面上生成一个200M大小的文件

最终速度取决于硬盘的读写速度

 package com.laurdawn;

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

 public class test {

     public static void main(String[] args) {
         // TODO Auto-generated method stub
         File f1 = new File("C:/Users/Administrator/Desktop/test.txt");
         try {
             FileOutputStream fos = new FileOutputStream(f1);
             if (!f1.exists()) {
                 try {
                     f1.createNewFile();
                 } catch (IOException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             }
             byte[] buffer = new byte[1024 * 200];
             long start = System.currentTimeMillis();
             for (int i = 0; i < 1024; i++) {
                 fos.write(buffer);
                 fos.flush();

             }
             long end = System.currentTimeMillis();
             long time = end - start;
             System.out.println("写入时间：" + time + "ms");
             fos.close();
         } catch (IOException e1) {
             // TODO Auto-generated catch block
             e1.printStackTrace();
         }
     }

 }