Stream、File、IO、

package com.dragon;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * @Description:
 * @Version:
 * @Time: 10:32 2024/08/20
 * @Author: zbl
 */
public class FileApp {
    private static final Logger log = LoggerFactory.getLogger(FileApp.class);
    private static final String path = System.getProperty("user.dir") + File.separator + "file-stream" + File.separator + "hello.txt";
    private static final String pathByObject = System.getProperty("user.dir") + File.separator + "file-stream" + File.separator + "person.txt";
    public static void main(String[] args) {
        writeFile();
        System.out.println("==============================================");
        readFile();

        System.out.println("======================序列化操作========================");
        writeObjectFile();
        readObjectFile();
    }

    /**
     * 读取文件
     */
    public static void readFile(){

        log.info("文件地址：{}",path);
        File file = new File(path);
        try (
                FileInputStream fileInputStream = new FileInputStream(file); // 创建文件输入流
                InputStreamReader isr = new InputStreamReader(fileInputStream, StandardCharsets.UTF_8); // 创建输入流读取器
                BufferedReader br = new BufferedReader(isr) // 创建缓冲读取器
        ){
            String line;
            while ((line = br.readLine()) != null){
                log.info(line);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 写入文件
     */
    public static void writeFile(){
        File file = new File(path);
        StringBuilder builder = new StringBuilder();
        try (
                FileOutputStream fileOutputStream = new FileOutputStream(file); // 创建文件输出流
                OutputStreamWriter osw = new OutputStreamWriter(fileOutputStream, StandardCharsets.UTF_8); // 创建输出流写入器
                BufferedWriter bw = new BufferedWriter(osw) // 创建缓冲写入器
        ){
            builder.append("现在是").append(LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))).append("写下《出师表》");
            builder.append(System.lineSeparator());
            builder.append("先帝创业未半而中道崩殂，今天下三分，益州疲弊，此诚危急存亡之秋也。然侍卫之臣不懈于内，忠志之士忘身于外者，盖追先帝之殊遇，欲报之于陛下也。诚宜开张圣听，以光先帝遗德，恢弘志士之气，不宜妄自菲薄，引喻失义，以塞忠谏之路也。");
            builder.append(System.lineSeparator());
            builder.append("宫中府中，俱为一体，陟罚臧否，不宜异同。若有作奸犯科及为忠善者，宜付有司论其刑赏，以昭陛下平明之理，不宜偏私，使内外异法也。");
            builder.append(System.lineSeparator());
            builder.append("侍中、侍郎郭攸之、费祎、董允等，此皆良实，志虑忠纯，是以先帝简拔以遗陛下。愚以为宫中之事，事无大小，悉以咨之，然后施行，必能裨补阙漏，有所广益。");
            bw.write(builder.toString());
            bw.newLine();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }finally {
            log.info("文件写入成功");
        }
    }
    /**
     * 序列化文件读取和写入
     */
    public static void writeObjectFile(){
        File file = new File(pathByObject);
        try (
                FileOutputStream fileOutputStream = new FileOutputStream(file); // 创建文件输出流
                ObjectOutputStream oos = new ObjectOutputStream(fileOutputStream) // 创建对象输出流
        ){
            oos.writeObject(new Person("zbl", 18));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }finally {
            log.info("文件写入成功");
       }
    }
    public static void readObjectFile(){
        File file = new File(pathByObject);
        try {
            FileInputStream fileInputStream = new FileInputStream(file); // 创建文件输入流
            ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream); // 创建对象输入流
            Person o = (Person) objectInputStream.readObject();
            log.info(o.toString());
        } catch (IOException | ClassNotFoundException e) {
            throw new RuntimeException(e);
        } finally {
            log.info("文件读取成功");
        }
    }

    static class Person implements Serializable{
        private String name;
        private int age;

        public Person(String name, int age) {
            this.name = name;
            this.age = age;
        }

        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;
       }

        @Override
        public String toString() {
            return "Person{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    '}';
        }
    }
}