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Android training and Java training. We look forward to communicating with you! ---------------------- Through this program, you can understand the operations of various files in the Java. Io. File class: Import java. Io. *; public class fileoperate { Public fileoperate (){ } Public void newfolder (string folderpath ){ Try { String filepath = folderpath; Filepath = filepath. tostring (); Java. Io. File myfilepath = new java. Io. File (filepath ); If (! Myfilepath. exists ()){ Myfilepath. mkdir (); } } Catch (exception e ){ System. Out. println ("Directory creation error "); E. printstacktrace (); } } Public void newfile (string filepathandname, string filecontent ){ Try { String filepath = filepathandname; Filepath = filepath. tostring (); File myfilepath = new file (filepath ); If (! Myfilepath. exists ()){ Myfilepath. createnewfile (); } Filewriter resultfile = new filewriter (myfilepath ); Printwriter myfile = new printwriter (resultfile ); String strcontent = filecontent; Myfile. println (strcontent ); Resultfile. Close (); } Catch (exception e ){ System. Out. println ("Directory creation error "); E. printstacktrace (); } } Public void delfile (string filepathandname ){ Try { String filepath = filepathandname; Filepath = filepath. tostring (); Java. Io. File mydelfile = new java. Io. File (filepath ); Mydelfile. Delete (); } Catch (exception e ){ System. Out. println ("File Deletion error "); E. printstacktrace (); } } Public void delfolder (string folderpath ){ Try { Delallfile (folderpath); // delete all contents String filepath = folderpath; Filepath = filepath. tostring (); Java. Io. File myfilepath = new java. Io. File (filepath ); Myfilepath. Delete (); // delete an empty folder } Catch (exception e ){ System. Out. println ("Folder deletion error "); E. printstacktrace (); } } Public void delallfile (string path ){ File file = new file (PATH ); If (! File. exists ()){ Return; } If (! File. isdirectory ()){ Return; } String [] templist = file. List (); File temp = NULL; For (INT I = 0; I <templist. length; I ++ ){ If (path. endswith (file. separator )){ Temp = new file (path + templist [I]); } Else { Temp = new file (path + file. Separator + templist [I]); } If (temp. isfile ()){ Temp. Delete (); } If (temp. isdirectory ()){ Delallfile (path + "/" + templist [I]); // delete the files in the folder first Delfolder (path + "/" + templist [I]); // Delete the empty folder. } } } Public void copyfile (string oldpath, string newpath ){ Try { Int bytesum = 0; Int byteread = 0; File oldfile = new file (oldpath ); If (oldfile. exists () {// when the file exists Inputstream instream = new fileinputstream (oldpath); // read the original file Fileoutputstream FS = new fileoutputstream (newpath ); Byte [] buffer = new byte [1444]; Int length; While (byteread = instream. Read (buffer ))! =-1 ){ Bytesum + = byteread; // file size in bytes System. Out. println (bytesum ); FS. Write (buffer, 0, byteread ); } Instream. Close (); } } Catch (exception e ){ System. Out. println ("An error occurred while copying a single file "); E. printstacktrace (); } } Public void copyfolder (string oldpath, string newpath ){ Try { (New file (newpath). mkdirs (); // create a new folder if the folder does not exist File a = new file (oldpath ); String [] file = A. List (); File temp = NULL; For (INT I = 0; I <file. length; I ++ ){ If (oldpath. endswith (file. separator )){ Temp = new file (oldpath + file [I]); } Else { Temp = new file (oldpath + file. Separator + file [I]); } If (temp. isfile ()){ Fileinputstream input = new fileinputstream (temp ); Fileoutputstream output = new fileoutputstream (newpath + "/" + (Temp. getname (). tostring ()); Byte [] B = new byte [1, 1024*5]; Int Len; While (LEN = input. Read (B ))! =-1 ){ Output. Write (B, 0, Len ); } Output. Flush (); Output. Close (); Input. Close (); } If (temp. isdirectory () {// if it is a subfolder Copyfolder (oldpath + "/" + file [I], newpath + "/" + file [I]); } } } Catch (exception e ){ System. Out. println ("An error occurred while copying the entire folder "); E. printstacktrace (); } } Public void movefile (string oldpath, string newpath ){ Copyfile (oldpath, newpath ); Delfile (oldpath ); } Public void movefolder (string oldpath, string newpath ){ Copyfolder (oldpath, newpath ); Delfolder (oldpath ); }} ---------------------- Android training, Java training, and hope to communicate with you! ----------------------
