copy

问题 Once again a very beginner-ish question, but here I go: I would like to use a servlet or similar to copy an uploaded file (from an html file select) to a permanent location. This is all I need to do with the file. I am currently going with using the Apache Commons FileUpload and IO libraries. Is there no easier or more elegant solution? 回答1: The Apache commons FileUpload is probably the best way if you are using pure JSP and servlets. If you use a framework like struts2 you will have some

问题 I have a large directory with many subdirectories that I am trying to sort, I am trying to copy specific file types to a new folder, but I want to maintain the original subdirectories. def copyFile(src, dest): try: shutil.copy(src,dest) except shutil.Error as e: print('Error: %s' % e) except IOError as e: print('Error: %s' % s.strerror) for root, directories, files in os.walk(directory): for directoryname in directories: dirpath = os.path.join(root,directoryname) dir_paths.append(dirpath) dir

问题 My app ( Android API 15 ) makes a picture and stores it in the internal memory's folder. Now, I want to copy this file to another folder inside of the external storage, e.g. /sdcard/myapp . I tried the following approaches: Approach #1: private void copyFile(File src, File dst) throws IOException { File from = new File(src.getPath()); File to = new File(dst.getPath()); from.renameTo(to); } Approach #2: private void copyFile(File src, File dst) throws IOException { FileChannel inChannel = null

问题 I want my class to hold a v8::Context and a v8::External as members. Therefore, I thought I had to use persistent handles. class ScriptHelper { public: ScriptHelper(v8::Persistent<v8::Context> Context) : context(Context) { // ... } // ... private: v8::Persistent<v8::Context> context; v8::Persistent<v8::External> external; }; However, persistent handles are non copyable in V8, so the code does not compile. The error occurs in the lines where the two memberes get initialized. For the context,

问题 I am trying to copy the entire tree (exactly all nodes) of a treeview (completely) to another treeview using this code: TreeNodeCollection myTreeNodeCollection = treeView1.Nodes; TreeNode[] myTreeNodeArray = new TreeNode[treeView1.Nodes.Count]; treeView1.Nodes.CopyTo(myTreeNodeArray, 0); treeView2.Nodes.AddRange(myTreeNodeArray); But this does not allow me to do so, it asks to either delete the nodes in source treeview or use it Clone! How can I do that? I dont want my source treeview to lose

问题 I am trying to copy the entire tree (exactly all nodes) of a treeview (completely) to another treeview using this code: TreeNodeCollection myTreeNodeCollection = treeView1.Nodes; TreeNode[] myTreeNodeArray = new TreeNode[treeView1.Nodes.Count]; treeView1.Nodes.CopyTo(myTreeNodeArray, 0); treeView2.Nodes.AddRange(myTreeNodeArray); But this does not allow me to do so, it asks to either delete the nodes in source treeview or use it Clone! How can I do that? I dont want my source treeview to lose

问题 Could someone explain how exactly the copy method for Kotlin data classes work? It seems like for some members, a (deep) copy is not actually created and the references are still to the original. fun test() { val bar = Bar(0) val foo = Foo(5, bar, mutableListOf(1, 2, 3)) println("foo : $foo") val barCopy = bar.copy() val fooCopy = foo.copy() foo.a = 10 bar.x = 2 foo.list.add(4) println("foo : $foo") println("fooCopy: $fooCopy") println("barCopy: $barCopy") } data class Foo(var a: Int, val bar

问题 I want to create an array of size n with the same value at every index in the array. What's the best way to do this in Java? For example, if n is 5 and the value is the boolean false , the array should be: = [false, false, false, false, false] 回答1: You can try it with: boolean[] array = new boolean[5]; Arrays.fill(array, false); Second method with manual array fill: boolean[] array = new boolean[] {false, false, false, false, false}; 回答2: List<Integer> copies = Collections.nCopies(copiesCount

问题 shutil.copy() is raising a permissions error: Traceback (most recent call last): File "copy-test.py", line 3, in <module> shutil.copy('src/images/ajax-loader-000000-e3e3e3.gif', 'bin/styles/blacktie/images') File "/usr/lib/python2.7/shutil.py", line 118, in copy copymode(src, dst) File "/usr/lib/python2.7/shutil.py", line 91, in copymode os.chmod(dst, mode) OSError: [Errno 1] Operation not permitted: 'bin/styles/blacktie/images/ajax-loader-000000-e3e3e3.gif' copy-test.py: import shutil shutil

问题 This is the part that crashes and gives me this error is when I try to copy a file to a certain location. string startupDirectory = "C:\\Users\\Tyler\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup"; File.Copy(startupDirectory, "Startup.exe"); I have read online and tried administrator rights and have created an "app.manifest" file: <requestedExecutionLevel level="requireAdministrator" uiAccess="false" /> <requestedExecutionLevel level="highestAvailable" uiAccess="false"