1 /** 2   *homework0926 3   *@author:kai li 4   */ 5 package com.kai.li.homework0927; 6 import java.util.List; 7 import java.util.ArrayList; 8 import java.nio.file.Files; 9 import java.nio.file.Paths;10 import java.nio.file.StandardOpenOption;11 import java.nio.charset.Charset;12 import java.util.Scanner;13 import java.io.BufferedReader;14 import java.io.FileReader;15 import java.io.File;16 /**17   *following class is client 18   */19 public class HomeWork0927{20     public static void main(String[] args)throws Exception{21         22         /**23           *question one24           */25 26         /*create data source*/27 28     String fileTarget="d:/text1.txt";29     List<String> lines=new ArrayList<>();30     lines.add("学号：17，姓名：小八。");31     lines.add("学号：18，姓名：小七。");32     33     /*write and read to a file*/34     35     //write 36     Files.write(Paths.get(fileTarget),lines,Charset.defaultCharset(),StandardOpenOption.CREATE);37     System.out.println("write is success");38     //read39     byte[] contentBytes=Files.readAllBytes(Paths.get(fileTarget));40     System.out.println(new String(contentBytes));41 42     /**43       *question two44       */45     46     //read47     byte[] contentBytes2=Files.readAllBytes(Paths.get(fileTarget));48     //input scanner49     System.out.println("please input file name");50     Scanner scanner=new Scanner(System.in);51     String txtName=scanner.nextLine();52     //write53     String fileTarget2="d:/"+txtName;54     Files.write(Paths.get(fileTarget2),contentBytes2,StandardOpenOption.CREATE);55     System.out.println("write is success");56 57     /**58       *question three59       */60     61     BufferedReader br=new BufferedReader(new FileReader(fileTarget2));62     String contentFileName=br.readLine();63     File file=new File(fileTarget2);64     File target=new File("e:/"+contentFileName+".txt");65     file.renameTo(target);66     System.out.println("move success");67     }68 }