Java File Operation example

Package COM. file. sample; import Java. io. ioexception; import Java. io. *; public class fileoperate {public fileoperate () {}/ *** create a directory ** @ Param folderpath * string such as C: /fqf * @ return Boolean */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 () ;}/ *** Create File *** @ Param filepathandname *** string file path and name, for example, C: /fqf.txt * @ Param filecontent * string file content ** @ return Boolean */Public void newfile (string filepathandname, string filecontent) {try {string filepath = filepathandname; filepath = filepath. tostring (); file Myf Ilepath = 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 () ;}/ ** delete file * @ Param filepathandname * string file path and name such as C:/fqf.txt * @ Param filecontent * String * @ return Boolean */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 () ;}/ *** Delete folder ** @ Param filepathandname * string folder path and name such as C:/fqf * @ Param filecontent * string * @ Return Boolean */Public void delfolder (string folderpath) {try {delallfile (folderpath); // After deleting all content, 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 ("An error occurred while deleting Folders"); E. printstacktrace () ;}}/*** delete all files in the folder * @ Param path * string folder path such as C:/fqf */Public Void delallfile (string path) {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 file delfolder (path + "/ "+ Templist [I]); // Delete the empty folder}/*** copy a single file ** @ Param oldpath * string original file path such as: C: /fqf.txt * @ Param newpath * string: path after copying, for example, F:/fqf.txt * @ return Boolean */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 fileoutputstrea M fs = new fileoutputstream (newpath); byte [] buffer = new byte [1444]; int length; while (byteread = instream. Read (buffer ))! =-1) {bytesum + = byteread; // number of bytes file size 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 () ;}/ *** copy the entire folder content ** @ Param oldpath * string original file path, for example, C: /fqf * @ Param newpath * string copied path, for example, F:/fqf/FF * @ return Boolean */Public void copyfolder (string oldpath, string newpath) {try {(New fil E (newpath )). mkdirs (); // create a new folder file a = new file (oldpath) if the folder does not exist; string [] file =. 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 file Outputstream (newpath + "/" + (temp. getname ()). tostring (); byte [] B = new byte [1024*5]; int Len; while (LEN = input. read (B ))! =-1) {output. write (B, 0, Len);} output. flush (); output. close (); input. close ();} If (temp. isdirectory () {// For subfolders copyfolder (oldpath + "/" + file [I], newpath + "/" + file [I]);} catch (exception e) {system. out. println ("An error occurred while copying the entire folder"); E. printstacktrace () ;}/ *** move the file to the specified directory ** @ Param oldpath * string such as: C:/fqf.txt * @ Param newpath * string such as: D: /fqf.txt */Public void movefile (string oldpath, string newpath) {copyfile (oldpath, newpath); delfile (oldpath );} /*** move the file to the specified directory ** @ Param oldpath * string such as: C:/fqf.txt * @ Param newpath * string such as: D: /fqf.txt */Public void movefolder (string oldpath, string newpath) {copyfolder (oldpath, newpath); delfolder (oldpath);} open the folder (operate the Windows folder) try {string [] cmd = new string [5]; cmd [0] = "cmd"; cmd [1] = "/C "; CMD [2] = "start"; cmd [3] = ""; cmd [4] = "D: \ apache-tomcat-7.0.20-windows-x86 \ apache-Tomcat-7.0.20 \ webapps \ Root "invalid runtime.getruntime(cmd.exe C (CMD);} catch (ioexception e) {e. printstacktrace ();}