2019.6.12Java/IO data

import java.util.*;
import java.io.*;
public class IOTest {
    
    public static void main(String[]args){
        File file = new File("d:\\data.txt");
        try{
            FileOutputStream out = new FileOutputStream(file);
             byte str[] = "12345abcdef@#%&*软件工程".getBytes();
             out.write(str);
             out.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        try{
            FileInputStream in = new FileInputStream(file);
            byte str[] = new byte[1024];    
            int len = in.read(str);
            System.out.println("文件中的信息是："+new String(str,0,len));
        }catch(Exception e){
            e.printStackTrace();
        }
        File file1 = new File("d:\\data.txt");
        //显示与文件有关的属性信息
        System.out.println("文件或目录是否存在：" + file1.exists());
        System.out.println("是文件吗：" + file1.isFile());
        System.out.println("是目录吗：" + file1.isDirectory());
        System.out.println("名称：" + file1.getName());
        System.out.println("绝对路径：" + file1.getAbsolutePath());
        System.out.println("文件大小：" + file1.length());

    }
}