package net.csdn.blog.wdd9527.week04.day05.test05;import java.io.File;/** 递归获取目录下的所有文件，包括子目录下的文件 */
public class Main03 {public static void main(String[] args) {File file = new File("d:" + File.separator + "360安全浏览器下载");display(file);}public static void display(File file) {// 判断文件是否存在if (!file.exists()) {return;}// 判断是否为目录if (file.isDirectory()) {File[] files = file.listFiles();for (File f : files) {if(f.isFile()){System.out.println(f.getAbsolutePath());}else{display(f);}}}else{System.out.println(file.getAbsolutePath());}}
}
package net.csdn.blog.wdd9527.week05.day01.test02;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;//序列化和反序列化public class Main {public static void main(String[] args) {Student s1 = new Student("张三", 19, '女', true);Student s2 = new Student("李四", 21, '男', false);Student s3 = new Student("赵五", 22, '女', true);ArrayList<Student> list = new ArrayList<>();ArrayList<Student> list1 = new ArrayList<>();list.add(s1);list.add(s2);list.add(s3);ObjectOutputStream oos = null;ObjectInputStream ois = null;try {oos = new ObjectOutputStream(new FileOutputStream(new File("bbb.dat")));ois = new ObjectInputStream(new FileInputStream(new File("bbb.dat")));for (Student student : list) {oos.writeObject(student); //为什么是乱码？}for (int i = 0; i < list.size(); i++) {Object readObject = ois.readObject();if (readObject instanceof Student) {Student s = (Student) readObject;list1.add(s);}}System.out.println(list1.toString());} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {try {oos.flush();oos.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}package net.csdn.blog.wdd9527.week05.day01.test02;import java.io.Serializable;public class Student implements Serializable{/*** */private static final long serialVersionUID = -2433290310809040457L;private String name;private Integer age;private char sex;private boolean isXxx;public Student() {super();}public Student(String name, Integer age, char sex, boolean isXxx) {super();this.name = name;this.age = age;this.sex = sex;this.isXxx = isXxx;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public char getSex() {return sex;}public void setSex(char sex) {this.sex = sex;}public boolean isXxx() {return isXxx;}public void setXxx(boolean isXxx) {this.isXxx = isXxx;}@Overridepublic String toString() {return "Student [name=" + name + ", age=" + age + ", sex=" + sex + ", isXxx=" + isXxx + "]";}}
package net.csdn.blog.wdd9527.week05.day01.test05;import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.TreeSet;/*** 已知项目根目录下student_info.txt文件中有如下数据：（姓名-年龄-总分)* lucy-28-98 * lily-23-97 * robt-25-100* wili-15-100 * klin-29-93 * 运用IO技术获取将该文件中的数据分别封装成5个Student* (姓名为String类型,年龄为int类型,总分为int类型 )对象存入TreeSet集合中（需要自己定义Student类）* 要求：* 根据学生的总分进行排序（降序），如果分数相同则比较年龄，年龄较大的排在前面。* 按照排序完的顺序将所有信息打印到控制台上: 打印格式如下：* robt-25-100 * wili-15-100 * lucy-28-98 * lily-23-97 * klin-29-93* * @author WDD**/public class Main {public static void main(String[] args) {BufferedReader reader = null;TreeSet<Student> set = new TreeSet<>();try {reader = new BufferedReader(new FileReader(new File("student_info.txt")));String s1 = null;while ((s1 = reader.readLine()) != null) {String[] split = s1.split("-");Student s = new Student();s.setName(split[0]);s.setAge(Integer.parseInt(split[1]));s.setGrade(Integer.parseInt(split[2]));set.add(s);}for (Student student : set) {System.out.println(student);}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}package net.csdn.blog.wdd9527.week05.day01.test05;public class Student implements Comparable<Student>{private String name;private Integer age;private Integer grade;public Student() {super();}public Student(String name, Integer age, Integer grade) {super();this.name = name;this.age = age;this.grade = grade;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Integer getGrade() {return grade;}public void setGrade(Integer grade) {this.grade = grade;}@Overridepublic String toString() {return "Student [name=" + name + ", age=" + age + ", grade=" + grade + "]";}@Overridepublic int compareTo(Student o) {if (this.grade == o.getGrade()) {if (this.age > o.getAge()) {return -1;} else {return 1;}} else if (this.grade > o.getGrade()) {return -1;} else {return 1;}}}
package net.csdn.blog.wdd9527.week04.day05.test06;import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Scanner;/*** 有五个学生，每个学生有3门课的成绩，从键盘输入以上数据（包括学生号，姓名，三门课成绩）* 计算出平均成绩，把原有的数据和计算出的平均分数存放在磁盘文件"stud "中。* * @author WDD**/public class Main {public static void main(String[] args) {Scanner sc = new Scanner(System.in);//HashMap<Student, Double> map = new HashMap<>(); //键值对的值不能是double double是基本类型。。ArrayList<Student> list = new ArrayList<>();for (int i = 1; i <= 5; i++) {System.out.println("请输入第" + i + "个学生的学号:");String number = sc.next();System.out.println("请输入第" + i + "个学生的姓名:");String name = sc.next();System.out.println("请输入第" + i + "个学生的语文成绩:");double chinaGrade = sc.nextDouble();System.out.println("请输入第" + i + "个学生的数学成绩:");double mathGrade = sc.nextDouble();System.out.println("请输入第" + i + "个学生的英语成绩:");double englishGrade = sc.nextDouble();double ave = (chinaGrade + mathGrade + englishGrade) / 3;System.out.println("第" + i + "个学生的平均成绩为:" + ave);Student s = new Student(number, name, chinaGrade, mathGrade, englishGrade,ave);list.add(s);}/*Set<Entry<Student,Double>> entrySet = map.entrySet();Iterator<Entry<Student, Double>> it = entrySet.iterator();while (it.hasNext()) {Entry<Student, Double> next = it.next();System.out.println(next);}*/Iterator<Student> it = list.iterator();while (it.hasNext()) {Student student = (Student) it.next();System.out.println(student.toString());}BufferedWriter bw = null;try {bw = new BufferedWriter(new FileWriter(new File("stud.txt")));/*Iterator<Student> it1 = list.iterator();while (it1.hasNext()) {Student student = (Student) it1.next();bw.write(student.toString());bw.newLine();*/for (Student student : list) {bw.write(student.toString());bw.newLine();}} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {try {bw.flush();bw.close();sc.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}package net.csdn.blog.wdd9527.week04.day05.test06;public class Student {private String stuNumber;//学号private String name;private double chinaGrade;private double mathGrade;private double englishGrade;private double ave;public Student() {super();}public Student(String stuNumber, String name, double chinaGrade, double mathGrade, double englishGrade,double ave) {super();this.stuNumber = stuNumber;this.name = name;this.chinaGrade = chinaGrade;this.mathGrade = mathGrade;this.englishGrade = englishGrade;this.ave = ave;}public String getStuNumber() {return stuNumber;}public void setStuNumber(String stuNumber) {this.stuNumber = stuNumber;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getChinaGrade() {return chinaGrade;}public void setChinaGrade(double chinaGrade) {this.chinaGrade = chinaGrade;}public double getMathGrade() {return mathGrade;}public void setMathGrade(double mathGrade) {this.mathGrade = mathGrade;}public double getEnglishGrade() {return englishGrade;}public void setEnglishGrade(double englishGrade) {this.englishGrade = englishGrade;}public double getAve() {return ave;}public void setAve(double ave) {this.ave = ave;}@Overridepublic String toString() {return "Student [stuNumber=" + stuNumber + ", name=" + name + ", chinaGrade=" + chinaGrade + ", mathGrade="+ mathGrade + ", englishGrade=" + englishGrade + ", ave=" + ave + "]";}}
package net.csdn.blog.wdd9527.week04.day05.test03;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;//图片的拷贝(改下名字可以实现别的拷贝)
//改变byte数组的大小，速度会更快，但是拷贝之后的内容占用空间更大public class Main {public static void main(String[] args) {File f = new File("d:" + File.separator + "Program Files" + File.separator + "视频原件.mp4");File f2 = new File("d:" + File.separator + "视频副本.mp4");InputStream in = null;OutputStream out = null;try {in = new FileInputStream(f);out = new FileOutputStream(f2);byte[] s = new byte[1024];while (in.read(s) != -1) {out.write(s);}} catch (Exception e) {// TODO: handle exception} finally {try {out.flush();out.close();in.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}