operatefile.java

java入门经典教程 java入门经典教程 java入门经典教程

 // 例 5.2.4 OperateFile.java
import java.io.*;
public class OperateFile
{
	public OperateFile()
	{
		//创建文件
		File newFile = new File("newfile.txt");
		try 
{
//createNewFile方法声明抛出了IOException异常和SecurityException异常
			if (newFile.exists() == false)
			{
				if (newFile.createNewFile() == true)
					System.out.println("create newfile.txt success");
			    else
					System.out.println("create newfile.txt fail");
			}
			else
				System.out.println("file already exists");
		}catch (IOException e) {
			e.printStackTrace();
		}catch (SecurityException e){
			e.printStackTrace();
		}

		//重命名文件
		File renameFile = new File("renamefile.txt");
		newFile.renameTo(renameFile);
		System.out.println(newFile.getName()+" is renamed by "+renameFile.get
Name());

		//移动文件
		File dest = new File("doc"); // 生成一个目录对象
		if (!dest.isDirectory())   // 测试该对象是不是目录
		{
			System.out.println("Directory :"+dest.getName()+" is not exists
");
			try  // mkdir方法声明抛出了SecurityException异常
			{
				if (dest.mkdir())   // 根据指定的对象创建一个新的目录
					System.out.println("Directory "+dest.getName()+" is crea
ted");
			}catch(SecurityException e){
				e.printStackTrace();
			}
		}
		File removeFile = new File(dest,renameFile.getName());
		renameFile.renameTo(removeFile);
		System.out.println(renameFile.getName()+" is removed to "+removeFile
.getPath());
		
		//删除文件
		try   // delete方法声明抛出了SecurityException异常
		{
			File delFile = new File(removeFile.getAbsolutePath());
			delFile.delete();
			System.out.println(removeFile.getName()+" in "+removeFile.getPa
rent()+" is deleted");
		}catch(SecurityException e){
			e.printStackTrace();
		}
	}
	public static void main(String[] args)
	{
		OperateFile operateFile = new OperateFile();
	}
}