[add] add module java-io and add examples about File

brianway · brianway · commit 724ffb2a1a12 · 2016-11-28T18:53:27.000+08:00
diff --git a/java-io/pom.xml b/java-io/pom.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-learning</artifactId>
+        <groupId>com.brianway.learning.java</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>java-io</artifactId>
+
+</project>
diff --git a/java-io/src/main/java/com/brianway/learning/java/io/DirList.java b/java-io/src/main/java/com/brianway/learning/java/io/DirList.java
@@ -0,0 +1,32 @@
+package com.brianway.learning.java.io;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.util.Arrays;
+import java.util.regex.Pattern;
+
+/**
+ * Created by brian on 16/11/28.
+ * 列举文件/文件夹
+ */
+public class DirList {
+    public static void main(final String[] args) {
+        File path = new File(".");
+        String[] list;
+        if (args.length == 0) {
+            list = path.list();
+        } else {
+            list = path.list(new FilenameFilter() {
+                private Pattern pattern = Pattern.compile(args[0]); // final String[] args
+
+                public boolean accept(File dir, String name) {
+                    return pattern.matcher(name).matches();
+                }
+            });
+        }
+        Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
+        for (String dirItem : list) {
+            System.out.println(dirItem);
+        }
+    }
+}
diff --git a/java-io/src/main/java/com/brianway/learning/java/io/MakeDirectories.java b/java-io/src/main/java/com/brianway/learning/java/io/MakeDirectories.java
@@ -0,0 +1,86 @@
+package com.brianway.learning.java.io;
+//: io/MakeDirectories.java
+// Demonstrates the use of the File class to
+// create directories and manipulate files.
+// {Args: MakeDirectoriesTest}
+
+import java.io.File;
+
+public class MakeDirectories {
+    private static void usage() {
+        System.err.println(
+                "Usage:MakeDirectories path1 ...\n" +
+                        "Creates each path\n" +
+                        "Usage:MakeDirectories -d path1 ...\n" +
+                        "Deletes each path\n" +
+                        "Usage:MakeDirectories -r path1 path2\n" +
+                        "Renames from path1 to path2");
+        System.exit(1);
+    }
+
+    private static void fileData(File f) {
+        System.out.println(
+                "Absolute path: " + f.getAbsolutePath() +
+                        "\n Can read: " + f.canRead() +
+                        "\n Can write: " + f.canWrite() +
+                        "\n getName: " + f.getName() +
+                        "\n getParent: " + f.getParent() +
+                        "\n getPath: " + f.getPath() +
+                        "\n length: " + f.length() +
+                        "\n lastModified: " + f.lastModified());
+        if (f.isFile()) {
+            System.out.println("It's a file");
+        } else if (f.isDirectory()) {
+            System.out.println("It's a directory");
+        }
+    }
+
+    public static void main(String[] args) {
+        if (args.length < 1) usage();
+        if (args[0].equals("-r")) {
+            if (args.length != 3) usage();
+            File
+                    old = new File(args[1]),
+                    rname = new File(args[2]);
+            old.renameTo(rname);
+            fileData(old);
+            fileData(rname);
+            return; // Exit main
+        }
+        int count = 0;
+        boolean del = false;
+        if (args[0].equals("-d")) {
+            count++;
+            del = true;
+        }
+        count--;
+        while (++count < args.length) {
+            File f = new File(args[count]);
+            if (f.exists()) {
+                System.out.println(f + " exists");
+                if (del) {
+                    System.out.println("deleting..." + f);
+                    f.delete();
+                }
+            } else { // Doesn't exist
+                if (!del) {
+                    f.mkdirs();
+                    System.out.println("created " + f);
+                }
+            }
+            fileData(f);
+        }
+    }
+}
+/* Output: (80% match)
+created MakeDirectoriesTest
+Absolute path: d:\aaa-TIJ4\code\io\MakeDirectoriesTest
+ Can read: true
+ Can write: true
+ getName: MakeDirectoriesTest
+ getParent: null
+ getPath: MakeDirectoriesTest
+ length: 0
+ lastModified: 1101690308831
+It's a directory
+*///:~
diff --git a/pom.xml b/pom.xml
@@ -47,6 +47,7 @@
         <module>java-multithread</module>
         <module>java-base</module>
         <module>java-container</module>
+        <module>java-io</module>
     </modules>
 
     <dependencyManagement>
