13-本地文件操作

一.文件的增删改查

二.文件夹的增删改查

三.文件属性的读取

 

四.文件属性设置

五.遍历文件夹

六.文件的简单读写

package com.example;


import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

public class MyClass {
    public static void main(String []args){
        File testFile = new File("testFile");
        if (testFile.exists()){
            try {
                FileInputStream fis = new FileInputStream(testFile);
                InputStreamReader isr = new InputStreamReader(fis,"UTF-8");
                BufferedReader br = new BufferedReader(isr);

                String line;
                while ((line = br.readLine())!= null){
                    System.out.println(line);
                }

                br.close();
                isr.close();
                fis.close();

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        else {
            try {
                testFile.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
            FileOutputStream fos = null;
            try {
                fos = new FileOutputStream(testFile);
                OutputStreamWriter osw = new OutputStreamWriter(fos,"UTF-8");
                BufferedWriter bw = new BufferedWriter(osw);

                bw.write("h
");
                bw.write("e
");
                bw.write("l
");
                bw.write("l
");
                bw.write("o
");

                bw.close();
                osw.close();
                fos.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }


        }
    }
}