Java利用高效缓冲字符流来快速copy文件

小灰灰 2022-01-30 16:47 238阅读 0赞

### Java利用高效缓冲字符流来快速copy文件 ###

代码:

package cn1;
    
    import java.io.*;
    import java.util.Date;
    
    public class Copy1 {
        public static void main(String[] args) {
            //算出程序开始的时间
            Date date = new Date();
            long starTime = date.getTime();
            BufferedReader reader = null;
            BufferedWriter writer = null;
            try {
                //创建一个高效缓冲输入流
                reader = new BufferedReader(new FileReader("hello.txt"));
                //创建一个高效缓冲输出流
                writer = new BufferedWriter(new FileWriter("hello1.txt"));
                //创建一个读一行的变量
                String line = null;
                while ((line = reader.readLine()) != null){
                    writer.write(line);
                    writer.newLine();//换行
                    writer.flush();
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (writer != null){
                        writer.close();
                    }
                    if (reader != null){
                        reader.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            Date date1 = new Date();
            long endTime = date1.getTime();
            long runTime = endTime - starTime;
            System.out.println("程序运行了"+runTime+"毫秒");
        }
    }