Java操作文件常用的9种方法

一、

//1、创建文件夹

public static boolean createFolder(String pathName){
	try {
		File folderPath = new File(pathName);
		if(!folderPath.exists()){
			folderPath.mkdir();
		}
		return true;
	} catch (Exception e) {
		e.printStackTrace();
		System.err.println("新建文件夹时，出错！");
		return false;
	}
}

** //2、创建文件**

public static boolean createFlie(String filePath){
	try {
		File file = new File(filePath);
		if(!file.exists()){
			file.createNewFile();
		}
		FileWriter fw = new FileWriter(file);
		PrintWriter pw = new PrintWriter(fw);
		pw.println(filePath);
		fw.close();
		pw.close();
		return true;
	} catch (IOException e) {
		e.printStackTrace();
		System.err.println("创建文件时，出错！");
		return false;
	}
}

** //3、删除空文件夹**

public static boolean deleteFolder(String floderPath){
	try {
		File delFloder = new File(floderPath);
		delFloder.delete();
		return true;
	} catch (Exception e) {
		e.printStackTrace();
		System.err.println("删除文件夹时，出错！");
		return false;
	}
	
}

** //4、删除指定文件**

public static boolean deleteFile(String filePath){
	try {
		File delFlie = new File(filePath);
		delFlie.delete();
		return true;
	} catch (Exception e) {
		e.printStackTrace();
		System.err.println("删除文件时，出错！");
		return false;
	}
}

** //5、删除某文件夹下的所有空文件夹**

public static boolean deleteFloderHasContent(String floderPath){
	try {
		File delFloderC = new File(floderPath);
		File[] files = delFloderC.listFiles();
		System.err.println(delFloderC.length());
		for (int i = 0; i < files.length; i++) {
			if(files[i].isDirectory()){
				files[i].delete();
			}
		}
		return true;
	} catch (Exception e) {
		e.printStackTrace();
		System.err.println("删除有内容的文件夹时，出错！");
		return false;
	}
}

** //6、记事本写入文件**

public static boolean readFile(String sourcePath, String content){
	try {
		File file = new File(sourcePath);
		FileWriter fw = new FileWriter(file);
		fw.write(content);
		fw.flush();
		fw.close();
		return true;
	} catch (Exception e) {
		e.printStackTrace();
		System.err.println("写入文件时，出错！");
		return false;
	}
}

** //7、读取文件属性**

public static void readFileMsg(String sourcePath){
	File file = new File(sourcePath);
	if(file.exists()){
		System.err.println("文件名称" + file.getName());
		System.err.println(file.isFile()?"文件":"不是文件");
		System.err.println(file.isDirectory()?"文件夹":"非文件夹");
		System.err.println(file.canRead()?"可读取":"不可读取");
		System.err.println(file.canWrite()?"是隐藏文件":"不是隐藏文件");
		System.err.println("最终修改时间"+new Date(file.lastModified()));
		System.err.println(file.canExecute()?"是执行文件":"不是执行文件");
		System.err.println("文件大小"+file.getTotalSpace());
	}
}

//8、复制文件夹

public static boolean copyFloder(String sourcePath, String totalPath){
	File file = new File(sourcePath);
	String[] fileLst = file.list();
	File tarFile = new File(totalPath);
	if(!tarFile.exists()){//创建，目标复制文件夹
		tarFile.mkdir();
	}
	for (int i = 0; i < fileLst.length; i++) {
		if((new File(sourcePath + file.separator + fileLst[i])).isDirectory()){//若文件夹中包含文件夹，则递归调用
			copyFloder(sourcePath + file.separator + fileLst[i], totalPath + file.separator + fileLst[i]);
		}
		if((new File(sourcePath + file.separator + fileLst[i])).isFile()){//文件夹内的文件
			System.err.println(sourcePath + file.separator + fileLst[i]);
			copyFile(sourcePath + file.separator + fileLst[i], totalPath + file.separator + fileLst[i]);
		}
	}
	return false;
}

//9、复制文件

public static boolean copyFile(String sourcePath, String targetPath){
	try {
		File file = new File(sourcePath);
		int byteread = 0;
		if(file.exists()){
			FileInputStream fi = new FileInputStream(file);//读取源文件
			FileOutputStream fo = new FileOutputStream(new File(targetPath));//写入目标文件
			byte[] buffer = new byte[1024];
			while ((byteread = fi.read(buffer)) != -1) {
				fo.write(buffer, 0, byteread);
			}
			fi.close();
			fo.close();
		}
		return true;
	} catch (Exception e) {
		e.printStackTrace();
		System.err.println("文件复制时，出错！");
		return false;
	}
}

二、测试文件夹的复制

我喜欢音乐，因此就拿这个文件夹做测试用例吧

String floderPath = "D:\\red_ant_file\\20181106\\KGMusic";
		String totalPath = "D:\\red_ant_file\\20181106\\KGMusicCopy";
		AllServiceIsHere.copyFloder(floderPath, totalPath);

运行后

完工！