java写文件方法之比较

借用了http://zhenqinghualy.blog.163.com/blog/static/5498053520100123332267/ 中老紫竹测试写文件方法的代码，在自己的机器跑了一下，结果如下：

 

FileOutputStream执行耗时:14279 豪秒
BufferedOutputStream执行耗时:453 豪秒
FileWriter执行耗时:1031 豪秒
FileChannel执行耗时:15184 豪秒

 

-- 附，测试代码如下：

import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.FileWriter;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;public class T { public static void main(String[] args) { FileOutputStream out = null; FileOutputStream outSTr = null; BufferedOutputStream Buff = null; FileWriter fw = null; int count = 1000000;// 写文件行数 try { byte[] bs = "测试java 文件操作/r/n".getBytes(); out = new FileOutputStream(new File("E:/add.txt")); long begin = System.currentTimeMillis(); for (int i = 0; i < count; i++) { out.write(bs); } out.close(); long end = System.currentTimeMillis(); System.out.println("FileOutputStream执行耗时:" + (end - begin) + " 豪秒"); outSTr = new FileOutputStream(new File("E:/add0.txt")); Buff = new BufferedOutputStream(outSTr); long begin0 = System.currentTimeMillis(); for (int i = 0; i < count; i++) { Buff.write(bs); } Buff.flush(); Buff.close(); long end0 = System.currentTimeMillis(); System.out.println("BufferedOutputStream执行耗时:" + (end0 - begin0) + " 豪秒"); fw = new FileWriter("E:/add2.txt"); long begin3 = System.currentTimeMillis(); for (int i = 0; i < count; i++) { fw.write("测试java 文件操作/r/n"); } fw.flush(); fw.close(); long end3 = System.currentTimeMillis(); System.out.println("FileWriter执行耗时:" + (end3 - begin3) + " 豪秒"); long begin4 = System.currentTimeMillis(); String path = "E:/add3.txt"; ByteBuffer bb = ByteBuffer.wrap(bs); FileChannel out2 = new FileOutputStream(path).getChannel(); for (int i = 0; i < count; i++) { out2.write(bb); bb.rewind(); } out2.close(); long end4 = System.currentTimeMillis(); System.out.println("FileChannel执行耗时:" + (end4 - begin4) + " 豪秒"); } catch (Exception e) { e.printStackTrace(); } finally { try { fw.close(); Buff.close(); outSTr.close(); out.close(); } catch (Exception e) { e.printStackTrace(); } } } }