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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(); } } } } }

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