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();
                }
            }
        }
    }
}