java 写文件的三种方法比较

import java.io.File;

import java.io.FileOutputStream;

import java.io.*;

public class FileTest {

public FileTest() {

}

public static void main(String[] args) {

FileOutputStream out = null;

FileOutputStream outSTr = null;

BufferedOutputStream Buff=null;

FileWriter fw = null;

int count=1000;//写文件行数

try {

out = new FileOutputStream(new File(“C:/add.txt”));

long begin = System.currentTimeMillis();

for (int i = 0; i < count; i++) {

out.write(“测试java 文件操作\r\n”.getBytes());

}

out.close();

long end = System.currentTimeMillis();

System.out.println(“FileOutputStream执行耗时:” + (end - begin) + ” 豪秒”);

outSTr = new FileOutputStream(new File(“C:/add0.txt”));

Buff=new BufferedOutputStream(outSTr);

long begin0 = System.currentTimeMillis();

for (int i = 0; i < count; i++) {

Buff.write(“测试java 文件操作\r\n”.getBytes());

}

Buff.flush();

Buff.close();

long end0 = System.currentTimeMillis();

System.out.println(“BufferedOutputStream执行耗时:” + (end0 - begin0) + ” 豪秒”);

fw = new FileWriter(“C:/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.close();

long end3 = System.currentTimeMillis();

System.out.println(“FileWriter执行耗时:” + (end3 - begin3) + ” 豪秒”);

} catch (Exception e) {

e.printStackTrace();

}

finally {

try {

fw.close();

Buff.close();

outSTr.close();

out.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

当count＝1000000的，即写文件1000000行的时候，写出的文件大小为18555KB：

FileOutputStream执行耗时:12063 豪秒

BufferedOutputStream执行耗时:1484 豪秒

FileWriter执行耗时:969 豪秒

当count＝1000的，即写文件1000行的时候，写出的文件大小为18.5KB：

FileOutputStream执行耗时:46 豪秒

BufferedOutputStream执行耗时:31 豪秒

FileWriter执行耗时:15 豪秒

转自：http://blog.csdn.net/malik76/article/details/6408726/