(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();
        }
    }

}