Java使用缓冲流实现文本文件的copy

package com.io.buffered;

import java.io.bufferedreader;
import java.io.bufferedwriter;
import java.io.filereader;
import java.io.filewriter;
import java.io.ioexception;

import org.junit.test;

/**
 * 使用缓冲流实现文本文件的copy
 * 
 */
public class bufferedstreamfiletext {
    @test
    public void copytesttexttest() {
        // 记录耗时
        long start = system.currenttimemillis();
        string src = "./hello.txt";
        string dest = "./world.txt";
        copytesttext(src, dest);
        long end = system.currenttimemillis();
        system.out.println("耗时：" + (end - start));
    }

    @suppresswarnings("resource")
    public static void copytesttext(string src, string dest) {
        // 3、创建filewriter 
        filewriter fw = null;
        // 4、创建bufferedwriter 用于包装节点流，提高效率
        bufferedwriter bw = null;
        try {
            // 1、创建filereader 
            filereader fr = new filereader(src);
            // 2、创建bufferedreader 用于包装节点流，提高效率
            bufferedreader br = new bufferedreader(fr);

            fw = new filewriter(dest);
            bw = new bufferedwriter(fw);
            // 5、读取指定文件内容
            string str = null;
            while ((str = br.readline()) != null) {
                // 6、将读取的内容写到目标地点
                bw.write(str + "\n");//读取文件换行
            }
        } catch (ioexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
        } finally {
            // 7、关闭流
            if (bw != null) {
                try {
                    bw.close();
                } catch (ioexception e) {
                    e.printstacktrace();
                }
            }
            if (fw != null) {
                try {
                    fw.close();
                } catch (ioexception e) {
                    e.printstacktrace();
                }
            }
        }
    }
}