第二十四章——文件管理的代码保存

这是关于文件的增删改查代码的记录：

package com.maya.hanqi.filemanager;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;public class TestFileManager {private static Map<String, File> fileMap = new HashMap<String, File>();private static boolean lock = true;public static void main(String[] args) {Scanner scanner = null;while (lock) {showContent();scanner = new Scanner(System.in);System.out.println("1---在选定的目录下创建文件夹");System.out.println("2---将选定的文件改名");System.out.println("3---将选定的文件删除");System.out.println("4---将选定的文件复制到另一个路径");System.out.println("5---退出");String console = scanner.nextLine();if ("1".equals(console)) {System.out.println("想在哪个文件夹下创建 ?");String path = scanner.nextLine();System.out.println("输入新文件夹的名字...");String folderName = scanner.nextLine();createFolder(path, folderName);}if ("2".equals(console)) {System.out.println("说 ! 改谁 ?");String fname = scanner.nextLine();System.out.println("改成什么 ?");String targetName = scanner.nextLine();renameFile(fname, targetName);}if ("3".equals(console)) {System.out.println("又看谁不顺眼了啊 ?");String fname = scanner.nextLine();deleteFile(fname);}if ("4".equals(console)) {System.out.println("复制哪个 ?");String fname = scanner.nextLine();System.out.println("复制到哪里 ?");String targetPath = scanner.nextLine();copyFile(fname, targetPath);}if ("5".equals(console)) {lock = false;System.err.println("系统已经退出 !");}}scanner.close();}public static void showContent() {File file = new File("E:\\java\\folder");System.out.println(file.getName());fileMap.put(file.getName(), file);factFile(file, 1);}public static void copyFile(String fname, String targetPath) {File file = fileMap.get(fname);BufferedReader br = null;BufferedWriter bw = null;String sc = null;if (!(file == null)) {if (fileMap.get(targetPath).isDirectory()) {try {File newFile = new File(fileMap.get(targetPath).getPath() + "\\" + fname);br = new BufferedReader(new FileReader(fileMap.get(fname)));bw = new BufferedWriter(new FileWriter(newFile));while ((sc = br.readLine()) != null) {bw.write(sc);}br.close();bw.close();System.err.println("文件复制成功 !");} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}} else {System.err.println("目标路径不是文件夹, 不能复制 !");return;}} else {System.err.println("输入的路径不存在 !");}}public static void deleteFile(String fname) {File file = fileMap.get(fname);if (!(file == null)) {if(file.listFiles().length > 0) {System.err.println("不是空文件夹, 无法删除 !");return;}file.delete();fileMap.remove(fname);System.err.println("文件已删除 !");} else {System.err.println("输入的路径不存在 !");}}public static void renameFile(String fname, String targetName) {File file = fileMap.get(fname);if (!(file == null)) {File newFile = new File(file.getParentFile().getPath() + "\\" + targetName);file.renameTo(newFile);System.out.println("文件名已经更改 !");} else {System.err.println("输入的路径不存在 !");}}public static void createFolder(String address, String folderName) {File file = fileMap.get(address);if (!(file == null)) {File newFile = new File(file.getPath() + "\\" + folderName);if (newFile.mkdirs()) {System.err.println("文件夹成功创建");} else {System.err.println("创建文件夹失败");}} else {System.err.println("输入的路径不存在 !");}}public static void console(int k) {for (int a = 0; a < k; a++) {System.out.print("   ");}}public static void factFile(File file, int length) {if (file.exists() && file.isDirectory()) {File[] fs = file.listFiles();for (int i = 0; i < fs.length; i++) {console(length);System.out.println(fs[i].getName());factFile(fs[i], length + 1);fileMap.put(fs[i].getName(), fs[i]);}}}
}