测试DataOutputStream和FileWriter 的性能

今天无聊测试了下DataOutputStream和FileWriter的性能，惊奇的发现FileWriter的性能比DataOutputStream的高很多倍啊，看了下源代码FileWriter里面也是构造了一个FileOutputStream,而我也是用FileOutputStream构造的DataOutputStream的啊，呵呵！

知道的高手了讨论下，我对java底层不是太了解。

测试代码如下：

import java.io.*;

public class FileTester {

	private DataOutputStream os;
	private FileWriter fw;


	public void test() throws IOException {
		os = new DataOutputStream(new FileOutputStream("D://test1.txt"));
		long time1 = System.currentTimeMillis();
		for (int i = 0; i < 1000000; i++) {
			os.write("测试测试测试测试/n".getBytes());
		}
		os.flush();
		os.close();

		long time2 = System.currentTimeMillis();
		fw = new FileWriter(new File("D://test3.txt"));
		for (int i = 0; i < 1000000; i++) {
			fw.write("测试测试测试测试/n");
		}
		fw.flush();
		fw.close();
		long time3 = System.currentTimeMillis();

		System.out.println("time1:" + (time2 - time1));
		System.out.println("time2:" + (time3 - time2));

	}

	public static void main(String[] args) throws IOException {
		FileTester f = new FileTester();
		f.test();

	}

}

测试结果：

time1:8390
time2:1000

测试环境：windows Xp + Eclipse + jdk5