51、作业

女爷i 2024-03-31 14:57 69阅读 0赞

![04b7848f2e014245ac69538982252a57.png][]

//我的代码：

package homework;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    public class Homework01 {
        public static void main(String[] args) throws IOException {
            String parentPath="e:\\mytemp1";
            String childPath="e:\\mytemp1\\hello.txt";
            String string="hello,world";
            File file=new File(parentPath);
            File file1 = new File(childPath);
            FileOutputStream fileOutputStream=null;
            fileOutputStream=new FileOutputStream(childPath);
            if(!(file.exists())){//如果文件夹不存在，那文件肯定不存在，都要创建
                file.mkdirs();//创建一个多级目录，即文件夹
                file1.createNewFile();//创建一个文件
            }else{
                if(!(file1.exists())){
                    file1.createNewFile();
                }else{
                    System.out.println("hello.txt已存在，无需再创建");
                }
            }
            fileOutputStream.write(string.getBytes());
            fileOutputStream.close();
        }
    }

//老师的代码：

package homework;
    
    import java.io.*;
    
    public class Homework01 {
        public static void main(String[] args) throws IOException {
            String directoryPath="e:\\mytemp";
            File file = new File(directoryPath);
            if(!(file.exists())){
                //创建
                if(file.mkdirs()){
                    System.out.println("创建 "+directoryPath+" 创建成功");
                }else{
                    System.out.println("创建 "+directoryPath+" 创建失败");
                }
            }
            String filePath=directoryPath+"\\hello.txt";
            file = new File(directoryPath);
            if(!(file.exists())){
                //创建文件
                if(file.createNewFile()){
                    System.out.println("创建 "+filePath+" 成功");
    
                    //写入内容
                    BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file));
                    bufferedWriter.write("hello,world");
                    bufferedWriter.close();
                }else{
                    System.out.println("创建 "+filePath+" 失败");
                }
            }else{
                System.out.println(filePath+" 已经存在，无需再创建");
            }
        }
    }

![d40b74723fc847c7b0841e8faaf03bf7.png][]

//我的代码：

package homework;
    
    import java.io.BufferedReader;
    import java.io.FileNotFoundException;
    import java.io.FileReader;
    import java.io.IOException;
    
    public class Homework02 {
        public static void main(String[] args) throws IOException {
            String filePath="e:\\hello.txt";
            BufferedReader bufferedReader = new BufferedReader(new FileReader(filePath));
            String line;
            int i=1;
            while((line=bufferedReader.readLine())!=null){
                System.out.println(i+" "+line);
                i++;
            }
            bufferedReader.close();
        }
    }
    //1 hello,world!
    //2 韩顺平
    //3 教育

//老师的代码：

package homework;
    
    import java.io.BufferedReader;
    import java.io.FileNotFoundException;
    import java.io.FileReader;
    import java.io.IOException;
    
    public class Homework02 {
        public static void main(String[] args) throws IOException {
            String filePath="e:\\hello.txt";
            BufferedReader br=null;
            String line="";
            int lineNum=0;
            try {
                br = new BufferedReader(new FileReader(filePath));
                while((line=br.readLine())!=null){
                    System.out.println(++lineNum+line);
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }finally {
                try {
                    if(br!=null){
                        br.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

![9c59132f37f04a63803858d30069962b.png][]

//我的代码：

package homework;
    
    import java.io.*;
    import java.util.Properties;
    
    public class Homework03 {
        public static void main(String[] args) throws IOException {
            Properties properties = new Properties();
            properties.load(new FileReader("src\\dog.properties"));
            properties.list(System.out);
            Dog dog = new Dog(properties.getProperty("name"),
                    properties.getProperty("age") , properties.getProperty("color"));
    
            String filePath="e:\\dog.txt";
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(filePath));
            oos.writeUTF(dog.getName());
            oos.writeUTF(dog.getAge());
            oos.writeUTF(dog.getColor());
            oos.close();
            System.out.println("数据序列化完毕");
        }
    }
    class Dog implements Serializable{
        private String name;
        private String age;
        private String color;
    
        public Dog(String name, String age, String color) {
            this.name = name;
            this.age = age;
            this.color = color;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getAge() {
            return age;
        }
    
        public void setAge(String age) {
            this.age = age;
        }
    
        public String getColor() {
            return color;
        }
    
        public void setColor(String color) {
            this.color = color;
        }
    
        @Override
        public String toString() {
            return "Dog{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    ", color='" + color + '\'' +
                    '}';
        }
    }
    //-- listing properties --
    //color=red
    //name=tom
    //age=5
    //数据序列化完毕

//老师的代码：

package homework;
    
    import java.io.*;
    import java.util.Properties;
    
    public class Homework03 {
        public static void main(String[] args) throws IOException, ClassNotFoundException {
            String filePath="src\\dog.properties";
            Properties properties = new Properties();
            properties.load(new FileReader(filePath));
            String name=properties.get("name")+"";
            int age=Integer.parseInt(properties.get("age")+"");
            String color=properties.get("color")+"";
    
            Dog dog = new Dog(name, age, color);
            System.out.println("======dog对象信息=======");
            System.out.println(dog);
    
            //序列化
            String serFilePath="e:\\dog.dat";
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(serFilePath));
            oos.writeObject(dog);
            oos.close();
            System.out.println("dog对象，序列化完成。。。");
            }
        }
    }
    class Dog implements Serializable{
        private String name;
        private int age;
        private String color;
    
        public Dog(String name, int age, String color) {
            this.name = name;
            this.age = age;
            this.color = color;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        public String getColor() {
            return color;
        }
    
        public void setColor(String color) {
            this.color = color;
        }
    
        @Override
        public String toString() {
            return "Dog{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    ", color='" + color + '\'' +
                    '}';
        }
    }
    //======dog对象信息=======
    //Dog{name='tom', age=5, color='red'}
    //dog对象，序列化完成。。。

[04b7848f2e014245ac69538982252a57.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/c991767e8bdf440ca6ceacbd461c8e64.png
[d40b74723fc847c7b0841e8faaf03bf7.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/c548302ae6ea4ec5a56212652d25660a.png
[9c59132f37f04a63803858d30069962b.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/4d05629f843c4e60ad3a42bf145f6332.png