文件目录删除操作类

男娘i 2022-01-25 23:49 315阅读 0赞

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);  
              
    	}
    }