Java学习记录(补充九:IO习题;FileReader...)

猜拳选择器
package com.jredu.homework;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;
import java.util.Scanner;

public class trueHomework {

    public String[] gameData = { "剪刀", "石头", "布" };

    /**
     * 产生电脑随机出拳数字
     */
    public int getPCNumber() {
        return (new Random()).nextInt(3) + 1;
    }

    /**
     * 获取用户输入数字
     */
    public int getUserNumber() {
        Scanner sc = new Scanner(System.in

        );
        int n = sc.nextInt();
        return n;
    }

    /**
     * 判断game结果
     */
    public String getGameResult(int userNumber, int pcNumber) {
        int result = userNumber - pcNumber;
        /**
         * 1 剪刀 2石头 3布 -1，2 负 0平 1，-2胜
         */
        String resultString = "";
        if (result == 0) {
            resultString = "平";
        } else if (result == -1 || result == 2) {
            resultString = "负";
        } else {
            resultString = "胜";
        }
        return resultString;
    }

    public String getGameStartTime() {
        Date date = new Date();
        SimpleDateFormat sf = new SimpleDateFormat("yyyy年M月d日 HH：mm");
        return sf.format(date);
    }

    public String readUserData() {
        File f = new File("G:/IO数据/game.txt.");
        if (!f.exists()) {
            return "";
        }
        StringBuilder userData = new StringBuilder();
        try {
            FileInputStream fis = new FileInputStream(f);
            byte[] data = new byte[1024];
            int len;
            while ((len = fis.read(data)) != -1) {
                userData.append(new String(data, 0, len));
            }
            fis.close();

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return userData.toString();
    }

    /**
     * 写入用户游戏数据
     */
    public void writeUserGameData(String userData) {
        File f = new File("G:/IO数据/game.txt");
        if (!f.getParentFile().exists()) {
            f.getParentFile().mkdirs();
        }

        try {
            FileOutputStream fos = new FileOutputStream(f, true);
            fos.write(userData.getBytes());
            fos.flush();
            fos.close();

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    public static void main(String[] args) {
        trueHomework game = new trueHomework();
        System.out.println("游戏开始。。。
您的历史成绩是：");
        System.out.println(game.readUserData());

        System.out.println("1- 剪刀  2-石头 3-布");

        String isGoon = "y";
        int gameCount = 0;

        String gameStartTime = game.getGameStartTime();
        System.out.println(gameStartTime);
        StringBuilder userData = new StringBuilder(gameStartTime);
        userData.append("
");
        do {
            gameCount++;
            System.out.println("1- 剪刀  2-石头 3-布");
            int pcNumber = game.getPCNumber();
            System.out.println("请选择出拳");
            int userNumber = game.getUserNumber();
            String resultString = game.getGameResult(userNumber, pcNumber);
            StringBuilder outputString = new StringBuilder("第");
            outputString.append(gameCount);
            outputString.append("局 电脑：");
            outputString.append(game.gameData[pcNumber - 1]);
            outputString.append("  用户：");
            outputString.append(game.gameData[userNumber - 1]);
            outputString.append(" ");
            outputString.append(resultString);
            // "第1局 电脑：剪刀 用户：石头 胜";
            System.out.println(outputString.toString());
            userData.append(outputString.toString());
            userData.append("
");
            System.out.println("是否继续y/n");
            Scanner sc = new Scanner(System.in

            );
            isGoon = sc.next();

        } while (!isGoon.equals("n"));

        game.writeUserGameData(userData.toString());

        System.out.println("游戏结束");

    }

}

结果图:

                            

将某个磁盘下的目录复制到另一个目录下(可含目录嵌套)
package com.jredu.iodemo;
import java.io 

.File;
import java.io 

.FileInputStream;
import java.io 

.FileNotFoundException;
import java.io 

.FileOutputStream;
import java.io 

.IOException;

public class AllFileCopyTest {
    //把一个目录内的全部文件复制到另一个目录里面
    public void copyFile(File sourcefile,File destFile){
        try {
            FileInputStream fis=new FileInputStream(sourcefile);
            FileOutputStream fos=new FileOutputStream(destFile.getAbsolutePath());
            int len=-1;
            byte[] data=new byte[1024];
            while((len=fis.read(data))!=-1){
                fos.write(data,0,len);
            }
            fis.close();
            fos.flush();
            fos.close();
            System.out.println("copied");
            
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public void copy(String sourcePath,String destPath){
        File f=new File(sourcePath);
        File destFile=new File(destPath);//G:/new_io
        if(!destFile.exists()){
            destFile.mkdir();
        }
        for(File file:f.listFiles()){
            
            
            if(file.isDirectory()){

                //G:/new_io/new
                File subFile=new File(destFile.getAbsoluteFile()
                                    +File.separator
                                    +file.getName());
                if(!subFile.exists()){
                    subFile.mkdir();
                }
                //G:/io/new     G:/new_id/new
                copy(file.getAbsolutePath(),subFile.getAbsolutePath());
            }else{
                //System.out.println(file.getAbsolutePath()+"
"+destFile.getAbsolutePath());
                 //d:/new_io/abc.data
                copyFile(file, 
                        new File(destFile.getAbsolutePath()
                                +File.separator
                                +file.getName()));
            }
        }
    }
    public static void main(String[] args) {
        AllFileCopyTest test=new AllFileCopyTest();
        test.copy("G:/IOO", "G:/new_IOO");

    }

}

结果图:

      

FileReader,BufferedReader和FileWriter,BufferedWriter
package com.jredu.iodemo;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class ReaderDemo {
    public static void main(String[] args) {
        try {
            FileReader fr = new FileReader("G:/IOO/dsa.txt");
            // BufferReader是高层流,只能借助底层流去实现(FileReader)
            // 流链
            BufferedReader br = new BufferedReader(fr);
            try {
                String s = null;
                while ((s = br.readLine()) != null) {
                    System.out.println(s);// 输出的S是文档内的内容
                }
                fr.close();
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        try {
            FileWriter fw = new FileWriter("G:/ad.txt");
            BufferedWriter bW = new BufferedWriter(fw);
            bW.write("hello file");
            bW.newLine();// 相当于做了一个换行
            bW.write("Ok");
            fw.flush();
            bW.flush();
            fw.close();
            bW.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

结果图: