[Java File read] #java

Main.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;

public class Main {

    /**
     * 步骤：
     * 1. File 创建文件句柄
     * 2. FileInputStream(fp):  fp -> buffer, 进来内存当中
     * 3. InputStreamReader: 解读buffer内存数据，如通过什么编码
     * 4. BufferedReader: 调用字节码读取的方法BufferedReader()准备数据读出来
     * @param filePath
     */
    public static void readFile(String filePath) {
        try {
            String encoding = "utf-8";
            File fp = new File(filePath);
            if (fp.isFile() && fp.exists()) {
                InputStreamReader reader = new InputStreamReader(new FileInputStream(fp), encoding);
                BufferedReader buffReader = new BufferedReader(reader);
                String line;
                while ((line = buffReader.readLine()) != null) {
                    System.out.println(line);
                }
                reader.close();
            } else {
                System.out.println("找不到该文件");
            }
        } catch (Exception e) {
            System.out.println("文件读取失败");
            e.printStackTrace();
        }
    }

    public static void main(String[] args)
    {
        readFile("/Users/fzq/project/my.txt");
    }
}