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How to delete files in java

Nov 21, 2019 pm 02:18 PM
java

How to delete files in java

java删除文件的方法:

package test816;
 
import java.io.File;
 
/**
 * 
 * 删除文件或目录
 * 
 */
 
public class DeleteFileUtil {
	/**
	 * 删除文件,可以是单个文件或文件夹
	 * 
	 * @param fileName
	 *            待删除的文件名
	 * @return 文件删除成功返回true,否则返回false
	 */
	public static boolean delete(String fileName) {
		File file = new File(fileName);
		if (!file.exists()) {
			System.out.println("删除文件失败:" + fileName + "文件不存在");
			return false;
		} else {
			if (file.isFile()) {
 
				return deleteFile(fileName);
			} else {
				return deleteDirectory(fileName);
			}
		}
	}
 
	/**
	 * 删除单个文件
	 * 
	 * @param fileName
	 *            被删除文件的文件名
	 * @return 单个文件删除成功返回true,否则返回false
	 */
	public static boolean deleteFile(String fileName) {
		File file = new File(fileName);
		if (file.isFile() && file.exists()) {
			file.delete();
			System.out.println("删除单个文件" + fileName + "成功!");
			return true;
		} else {
			System.out.println("删除单个文件" + fileName + "失败!");
			return false;
		}
	}
 
	/**
	 * 删除目录(文件夹)以及目录下的文件
	 * 
	 * @param dir
	 *            被删除目录的文件路径
	 * @return 目录删除成功返回true,否则返回false
	 */
	public static boolean deleteDirectory(String dir) {
		// 如果dir不以文件分隔符结尾,自动添加文件分隔符
		if (!dir.endsWith(File.separator)) {
			dir = dir + File.separator;
		}
		File dirFile = new File(dir);
		// 如果dir对应的文件不存在,或者不是一个目录,则退出
		if (!dirFile.exists() || !dirFile.isDirectory()) {
			System.out.println("删除目录失败" + dir + "目录不存在!");
			return false;
		}
		boolean flag = true;
		// 删除文件夹下的所有文件(包括子目录)
		File[] files = dirFile.listFiles();
		for (int i = 0; i < files.length; i++) {
			// 删除子文件
			if (files[i].isFile()) {
				flag = deleteFile(files[i].getAbsolutePath());
				if (!flag) {
					break;
				}
			}
			// 删除子目录
			else {
				flag = deleteDirectory(files[i].getAbsolutePath());
				if (!flag) {
					break;
				}
			}
		}
 
		if (!flag) {
			System.out.println("删除目录失败");
			return false;
		}
 
		// 删除当前目录
		if (dirFile.delete()) {
			System.out.println("删除目录" + dir + "成功!");
			return true;
		} else {
			System.out.println("删除目录" + dir + "失败!");
			return false;
		}
	}
	// 删除文件夹
	// param folderPath 文件夹完整绝对路径
 
	public static void delFolder(String folderPath) {
		try {
			delAllFile(folderPath); // 删除完里面所有内容
			String filePath = folderPath;
			filePath = filePath.toString();
			java.io.File myFilePath = new java.io.File(filePath);
			myFilePath.delete(); // 删除空文件夹
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
	// 删除指定文件夹下所有文件
	// param path 文件夹完整绝对路径
	public static boolean delAllFile(String path) {
		boolean flag = false;
		File file = new File(path);
		if (!file.exists()) {
			return flag;
		}
		if (!file.isDirectory()) {
			return flag;
		}
		String[] tempList = file.list();
		File temp = null;
		for (int i = 0; i < tempList.length; i++) {
			if (path.endsWith(File.separator)) {
				temp = new File(path + tempList[i]);
			} else {
				temp = new File(path + File.separator + tempList[i]);
			}
			if (temp.isFile()) {
				temp.delete();
			}
			if (temp.isDirectory()) {
				delAllFile(path + "/" + tempList[i]);// 先删除文件夹里面的文件
				delFolder(path + "/" + tempList[i]);// 再删除空文件夹
				flag = true;
			}
		}
		return flag;
	}
 
	public static void main(String[] args) {
		// String fileName = "g:/temp/xwz.txt";
		// DeleteFileUtil.deleteFile(fileName);
		String fileDir = "D:\\temp\\pom.xml";
		// DeleteFileUtil.deleteDirectory(fileDir);
		DeleteFileUtil.delete(fileDir);
		DeleteFileUtil t = new DeleteFileUtil();
		delFolder("c:/bb");
		System.out.println("deleted");
 
	}
}
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