Java输入输出流

要求1

保存对象信息到文件,并将文件中的对象信息显示出来。

代码

此处对象为一个学生对象

import java.io.*;
class Student implements Serializable{
    String number, name;
    public String getNumber() {
        return number;
    }
    public void setNumber(String number) {
        this.number = number;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}
public class Example3 {
    public static void writeObjectToFile(Object obj, File file) {
        try {
            ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(file));
            objectOutputStream.writeObject(obj);
            objectOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static Object readObjectFromFile(File file) {
        try {
            ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream(file));
            Object o = inputStream.readObject();
            inputStream.close();
            return o;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    public static void main(String[] args){
        Student stu = new Student();
        stu.setNumber("123456789");
        stu.setName("张三");
        File file = new File("test.txt");
        writeObjectToFile(stu, file);
        Student stu1;
        stu1 = (Student) readObjectFromFile(file);
        System.out.println("学号：" + stu1.getNumber());
        System.out.println("姓名：" + stu1.getName());
    }
}

要求2

将保存在本地机当前文件夹中的Ex3_2.HTML文本文件的内容在屏幕上显示出来，然后将其另存为Ex3_2.txt文件。

代码

import java.io.*;

public class Example2 {
    public static void main(String[] args) throws IOException {
        FileReader in = new FileReader("Ex3_2.HTML");
        FileWriter out = new FileWriter("Ex3_2.txt");
        BufferedReader br = new BufferedReader(in);
        BufferedWriter bw = new BufferedWriter(out);
        String str = null;
        while((str = br.readLine()) != null){
            System.out.println(str);
            bw.write(str);
            bw.newLine();
        }
        bw.flush();
        in.close();
        out.close();
        br.close();
        bw.close();
    }
}