开发笔记:File类的深度学习(超简易文件管理器)——《ThinkinginJava》随笔028

1 //: MakeDirectories.java
2 package c10;
3
4 import java.io.File;
5 import java.text.SimpleDateFormat;
6 import java.util.Date;
7
8 /**
9 * @time: 下午7:59:23
10 * @date: 2017年4月29日
11 * @auther: skyfffire
12 * @version: v0.1
13 */
14 public class MakeDirectories {
15 private final static String usage
16 = "\n\n1.Usage:MakeDirectories path1...\n"
17 + "\tCreates each path\n\n"
18 + "2.Usage:MakeDirectories -d path1...\n"
19 + "\tDeletes each path\n\n"
20 + "3.Usage:MakeDirectories -r path1 path2...\n"
21 + "\tRenames from path1 to path2\n\n";
22
23 /**
24 * 使用方法
25 */
26 private static void usage() {
27 System.out.println(usage);
28 System.exit(1);
29 }
30
31 /**
32 * 显示一个path的详细信息
33 *
34 * @param f 需要显示的path
35 */
36 private static void fileData(File f) {
37 System.out.println("\n\nAbsolute path:" + f.getAbsolutePath());
38 System.out.println("Can read:" + f.canRead());
39 System.out.println("Can Write:" + f.canWrite());
40 System.out.println("getName:" + f.getName());
41 System.out.println("getParent:" + f.getParent());
42 System.out.println("getPath:" + f.getPath());
43 System.out.println("length:" + f.length());
44 System.out.println("lastModified:"
45 + new SimpleDateFormat("yy-MM-dd").
46 format(new Date(f.lastModified())));
47
48 if (f.isFile()) {
49 System.out.println("It‘s a file.");
50 } else if (f.isDirectory()) {
51 System.out.println("It‘s a directory.");
52 }
53
54 System.out.println("\n\n");
55 }
56
57 /**
58 * 打印当前目录下的所有path
59 */
60 private static void printPath() {
61 System.out.println();
62
63 File point = new File(".");
64
65 String[] path = point.list();
66
67 for (String nowString : path) {
68 System.out.println(nowString);
69 }
70
71 System.out.println();
72 }
73
74 public static void main(String[] args) {
75 printPath();
76
77 if (args.length <1) {
78 usage();
79 }
80
81 // 更新path名字命令
82 if (args[0].equals("-r")) {
83 if (args.length != 3) {
84 usage();
85 } else {
86 File old = new File(args[1]);
87 File rname = new File(args[2]);
88
89 if (old.exists() && !rname.exists()) {
90 // 更新文件名
91 old.renameTo(rname);
92 } else {
93 System.out.println("rename error: "
94 + old.getName() + " to " + rname.getName());
95 }
96
97 // 打印信息
98 fileData(old);
99 fileData(rname);
100 }
101 } // 执行删除命令
102 else if (args[0].equals("-d")) {
103 for (int count = 1; count ) {
104 File f = new File(args[count]);
105
106 // 判断f是否存在
107 if (f.exists()) {
108 System.out.println(f + " exists");
109
110 System.out.println("deleting..." + f);
111 f.delete();
112
113 fileData(f);
114 } else {
115 System.out.println(f + " path is not found.");
116 }
117 }
118 } // 执行创建命令
119 else {
120 for (int count = 0; count ) {
121 File f = new File(args[count]);
122
123 f.mkdirs();
124 // f.mkdir()与f.mkdirs()的区别在于
125 // mkdir不能在不存在的目录创建文件夹
126
127 System.out.println("created " + f);
128
129 fileData(f);
130 }
131 }
132
133 printPath();
134 }
135 }
136
137 ///:~