暑假日报-24

今天做了io相关的练习题

遇到的主要问题是网上的例子有点老了，放到编译器里并不能运行，不过还是解决了

package com.xykj.lesson1;

import java.io.File;
import java.io.IOException;


public class Test1 {
	public static void main(String[] args) {
		File file=new File("D:","HelloWorld.txt");
		
		boolean isCreate;
		try {
			isCreate = file.createNewFile();
			if (isCreate) {
				System.out.println("创建文件成功！");
			}else {
				System.out.println("创建文件失败！文件已经存在");
			}
		} catch (IOException e) {
			System.out.println("创建文件失败！");
		}
		
		if (file.isFile()) {
			System.out.println("这是一个文件");
		} else {
			System.out.println("这是一个目录");
		}
		
		File file2=new File("D:/IOTest");
		file2.mkdirs();
		
		if (file.renameTo(file2)) {
			System.out.println("文件移动成功！");
		} else {
			System.out.println("文件移动失败");
		}
		
		String[] arr=file2.list();
		for (String string : arr) {
			System.out.println(string);
		}
	}
}

package com.xykj.lesson2;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
public class FileUtils {
	
	public static List getAllFiles(String dir){
		
		List< File >files=new ArrayList();
		
		File file=new File(dir);
		if (file.exists()&&file.isDirectory()) {
			longErgodic(file,files);
		}
		return files;
	}
	
	private static void longErgodic(File file, List files) {
		File[] fillArr=file.listFiles();
		 if (fillArr==null) {
			return;
		}
		 for (File file2 : fillArr) {
			 files.add(file2);
			 longErgodic(file2, files);
		}
	}
}

package com.xykj.lesson2;

import java.io.File;
import java.util.List;

public class Test2 {
	public static void main(String[] args) {
		Listlist=FileUtils.getAllFiles("D:");
		for (File file : list) {
			System.out.println(file);
		}

	}

}

package com.xykj.lesson3;

import java.io.File;
import java.util.List;

import com.xykj.lesson2.FileUtils;

public class Test3 {
	public static void main(String[] args) {
		Listlist=FileUtils.getAllFiles(".");
		for (File file : list) {
			if (file.toString().endsWith(".java")) {
				System.out.println(file.getName());
			}
		}

	}

}

package com.xykj.lesson4;

import java.io.File;
import java.io.FileInputStream;

public class Tset4 {
	public static void main(String[] args) {
		File file = new File("D:\notePad\aa.txt");
		try {
　　　　　　　　　　　　FileInputStream fis = new FileInputStream(file);
			int len = 0;
			byte[] buf = new byte[1024];
			StringBuffer sb = new StringBuffer();
			while ((len = fis.read(buf)) != -1) {
				sb.append(new String(buf, 0, len));
			}
			System.out.println(sb);
			fis.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

package com.xykj.lesson5;

import java.io.File;
import java.io.FileOutputStream;

public class Test5 {
	public static void main(String[] args) {
		File file = new File("D:/Hello.txt");
		try {
			FileOutputStream fos = new FileOutputStream(file);
			fos.write("HelloJavaWorld你好世界".getBytes());
			fos.flush();
			fos.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}