文件目录删除操作类

package com.gg.demo.dir;

import java.io.File;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* 文件目录删除操作类
**/
public class DeleteDirectory {
	/**
	 * 删除空目录
	 * 
	 * @param dir
	 *            将要删除的目录路径
	 */
	private static void doDeleteEmptyDir(String dir) {
		boolean success = (new File(dir)).delete();
		if (success) {
			System.out.println("Successfully deleted empty directory: " + dir);
		} else {
			System.out.println("Failed to delete empty directory: " + dir);
		}
	}

	/**
	 * 递归删除目录下的所有文件及子目录下所有文件
	 * 
	 * @param dir
	 *            将要删除的文件目录
	 * @return boolean Returns "true" if all deletions were successful. If a
	 *         deletion fails, the method stops attempting to delete and returns
	 *         "false".
	 */
	private static boolean deleteDir(File dir) {
		if (dir.isDirectory()) {
			String[] children = dir.list();
			// 递归删除目录中的子目录下
			for (int i = 0; i < children.length; i++) {
				boolean success = deleteDir(new File(dir, children[i]));
				if (!success) {
					return false;
				}
			}
		}
		// 目录此时为空，可以删除
		return dir.delete();
	}
	
	public static void traverseFolder2(String path) {

		File file = new File(path);
		if (file.exists()) {
			File[] files = file.listFiles();
			if (files.length == 0) {
				System.out.println("文件夹是空的!");
				return;
			} else {
				for (File file2 : files) {
					if (file2.isDirectory()) {
						System.out.println("文件夹:" + file2.getAbsolutePath());
						traverseFolder2(file2.getAbsolutePath());
					} else {
						System.out.println("文件:" + file2.getAbsolutePath());
					}
				}
			}
		} else {
			System.out.println("文件不存在!");
		}
	}

	public static void getDir(String strPath) {
		File f = new File(strPath);
		if (f.isDirectory()) {
			File[] fList = f.listFiles();
			for (File f1 : fList) {
				System.out.println(f1.getName());
			}
		}
	}
	
	//获取N天前的截止日期
	public static Date getNextDay(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.add(Calendar.DAY_OF_MONTH, -8);
		date = calendar.getTime();
		return date;
	}
	
	//删除 截止日期之前的文件夹
	public static void getNextDay22(String strPath,Date date) {
		Calendar ca = Calendar.getInstance();
//		Date curDate;
//		Date b;
//		假设现在你已经实例化了a和b
//		curDate.after(b)返回一个boolean，如果curDate的时间在b之后（不包括等于）返回true
//		b.before(curDate)返回一个boolean，如果b的时间在curDate之前（不包括等于）返回true
//		curDate.equals(b)返回一个boolean,如果a的时间和b相等返回true
		//获取删除的截止日期
		Date curDate = getNextDay(date);
		File f = new File(strPath);
		if (f.exists()) {
			File[] files = f.listFiles();
			if (files.length == 0) {
				System.out.println("文件夹是空的!");
				return;
			} else {
				for (File file2 : files) {
					if (file2.isDirectory()) {
						SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss");  
						try {
							Date d = sdf.parse(file2.getName() + " " + "00:00:00");
							if(d.before(curDate)){
								System.out.println(strPath + "/" + file2.getName());
								deleteDir(new File(strPath + "/" + file2.getName()));
							}
						} catch (ParseException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}  
					} else {
						System.out.println("文件:" + file2.getAbsolutePath());
					}
				}
			}
		} else {
			System.out.println("文件不存在!");
		}
	}
	
	
	

	/**
	 * 测试
	 */
	public static void main(String[] args) {
		// doDeleteEmptyDir("new_dir1");
//		String newDir2 = "F:/data/20170525";
//		boolean success = deleteDir(new File(newDir2));
//		if (success) {
//			System.out.println("Successfully deleted populated directory: " + newDir2);
//		} else {
//			System.out.println("Failed to delete populated directory: " + newDir2);
//		}
//		// traverseFolder2("F:/data");
//		getDir("F:/data");
		
		
		Date d = new Date();  
		getNextDay22("F:/data", d);
//		Date nextDay = getNextDay(d);
//        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");  
//        String dateNowStr = sdf.format(nextDay);  
//        System.out.println("格式化后的日期：" + dateNowStr);  
          
	}
}