可能是史上最好用的 Java 文件操作帮助类

迈不过友情╰ 2022-06-06 09:35 238阅读 0赞

package com.lb.util;
    
    import java.io.File;
    import java.io.FileFilter;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.nio.channels.FileChannel;
    import java.util.ArrayList;
    import java.util.List;
    
    public class FileHelper { 
    
        private List<String> filePathList = new ArrayList<>();
    
        /** * 获取一个路径下的所有文件(包含子文件夹) * * @param rootPath */
        public List<String> getAllFilePath(String rootPath) {
            File file = new File(rootPath);
            File[] files = file.listFiles();
    
            for (int i = 0; i < files.length; i++) {
                if (files[i].isDirectory()) {
                    getAllFilePath(files[i].getPath());
                } else {
                    filePathList.add(files[i].getPath());
                }
            }
    
            return filePathList;
        }
    
        /** * 获取一个路径下的所有文件(包含子文件夹) 可以指定过滤规则 * * @param rootPath */
        public List<String> getAllFilePath(String rootPath, FileFilter fileFilter) {
            File file = new File(rootPath);
            File[] files = file.listFiles(fileFilter);
    
            for (int i = 0; i < files.length; i++) {
                if (files[i].isDirectory()) {
                    getAllFilePath(files[i].getPath(), fileFilter);
                } else {
                    filePathList.add(files[i].getPath());
                }
            }
    
            return filePathList;
        }
    
        /** * 删除空目录 * @param dir 将要删除的目录路径 */
        public 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". */
        public static boolean deleteDir(File dir) {
            if (dir.isDirectory()) {
                String[] children = dir.list();
                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();
        }
    
        /** * 使用文件通道的方式复制文件 * * @param srcPath * 源文件 "F:/期刊导航数据/学术之家/21世纪/54431b8d_92cf.jpg" * @param descPath * 复制到的新文件 "F:/期刊导航数据/out */
        public static void copy(String srcPath, String descPath) {
            File s = new File(srcPath);
            File t = new File(descPath + "/" + s.getName());
    
            FileInputStream fi = null;
            FileOutputStream fo = null;
            FileChannel in = null;
            FileChannel out = null;
            try {
                fi = new FileInputStream(s);
                fo = new FileOutputStream(t);
                in = fi.getChannel();// 得到对应的文件通道
                out = fo.getChannel();// 得到对应的文件通道
                in.transferTo(0, in.size(), out);// 连接两个通道，并且从in通道读取，然后写入out通道
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    fi.close();
                    in.close();
                    fo.close();
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    
        /** * 使用文件通道的方式复制文件 * @param srcFile * 源文件 源文件 "F:/期刊导航数据/学术之家/21世纪/54431b8d_92cf.jpg" * @param descPath * 目标路径 "F:/期刊导航数据/out" * */
        public static void copy(File srcFile, String descPath) {
            File s = srcFile;
            File t = new File(descPath + "/" + s.getName());
            FileInputStream fi = null;
            FileOutputStream fo = null;
            FileChannel in = null;
            FileChannel out = null;
            try {
                fi = new FileInputStream(s);
                fo = new FileOutputStream(t);
                in = fi.getChannel();// 得到对应的文件通道
                out = fo.getChannel();// 得到对应的文件通道
                in.transferTo(0, in.size(), out);// 连接两个通道，并且从in通道读取，然后写入out通道
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    fi.close();
                    in.close();
                    fo.close();
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    
    
        /** * 对当前文件夹下的文件改名 * @param oldFilePath * @param newName */
        public static void reName(String oldFilePath, String newName) {
            String basePath = oldFilePath.substring(0, oldFilePath.lastIndexOf("/"));
            String descPaht =basePath + "/" + newName;
            reNameTo(oldFilePath, descPaht);
        }
    
        /** * 对当前文件夹下的文件改名 * @param oldFilePath * @param newName */
        public static void reName(File oldFile, String newName) {
            String oldFilePath = oldFile.getPath();
            String basePath = oldFilePath.substring(0, oldFilePath.lastIndexOf("\\"));
            String descPaht =basePath + "/" + newName;
            reNameTo(oldFile, descPaht);
        }
    
        /** * 在目标目录下创建 文件夹 * @param descPath "C:\Users\Administrator\Desktop\工作\编码测试\pptImgs\[推广方案ppt-www.1ppt.com]" * @param dirName "image" */
        public static void makeDir(String descPath, String dirName) {
            File file = new File(descPath);
    
            if (file != null) {
                new File(descPath + "/" + dirName).mkdir();
            } else {
                System.out.println("目标目录不为空");
            }
        }
    
        private static void reNameTo(File oldFile, String newFilePath) {
            oldFile.renameTo(new File(newFilePath));
        }
    
        private static void reNameTo(String oldFilePath, String newFilePath) {
            File oldFile = new File(oldFilePath);
            oldFile.renameTo(new File(newFilePath));
        }
    }