java 写文件的三种方法比较

来源：互联网发布：java随机生成二维数组编辑：程序博客网时间：2024/05/14 05:11
import java.io.File;import java.io.FileOutputStream;import java.io.*;public class 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 {            //经过测试：FileOutputStream执行耗时:17，6，10 毫秒            out = new FileOutputStream(new File("C:\\Users\\lee\\Desktop\\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) + " 毫秒");            //经过测试：ufferedOutputStream执行耗时:1,1，1 毫秒            outSTr = new FileOutputStream(new File("C:\\Users\\lee\\Desktop\\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) + " 毫秒");            //经过测试：FileWriter执行耗时:3,9，5 毫秒            fw = new FileWriter("C:\\Users\\lee\\Desktop\\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) + " 毫秒");        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                fw.close();                Buff.close();                outSTr.close();                out.close();            } catch (Exception e) {                e.printStackTrace();            }        }    }}
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