Java File copy function

In writing code, it is often necessary to copy files. These functions can then be put into the tool class.

Here is a function to copy the file:

public class Copyfileutil {private static String MESSAGE = "";            /** * Copy a single file * * @param srcfilename * file name to be copied * @param descfilename * Target filename * @param overlay * If the destination file exists, overwrite * @return If the copy succeeds returns TRUE, otherwise false */public STA Tic Boolean CopyFile (String srcfilename, String destFileName, Boolean overlay) {File srcfile = new            File (Srcfilename); Determine if the source file exists if (!srcfile.exists ()) {MESSAGE = "source file:" + Srcfilename + "does not exist!              ";              Joptionpane.showmessagedialog (null, MESSAGE);          return false; } else if (!srcfile.isfile ()) {MESSAGE = "Copy file failed, source file:" + Srcfilename + "is not a file!              ";              Joptionpane.showmessagedialog (null, MESSAGE);          return false;          }//To determine if the target file exists with the files DestFile = new file (destfilename); if (destfile.exists ()) {//If the destination file exists and allows overwriting              if (overlay) {//delete the target file that already exists, regardless of whether the destination file is a directory or a single file (destFileName). delet              E ();                  }} else {//If the destination file is located in a directory that does not exist, create a directory if (!destfile.getparentfile (). exists ()) { The directory where the destination file is located does not exist if (!destfile.getparentfile (). Mkdirs ()) {//Copy file failed: The directory where the target file was created is missing                  Fail to return false; }}}//copy file int byteread = 0;          Number of bytes read InputStream in = null;            OutputStream out = null;              try {in = new FileInputStream (srcfile);              out = new FileOutputStream (destfile);                byte[] buffer = new byte[1024];              while ((Byteread = in.read (buffer))! =-1) {out.write (buffer, 0, byteread);          } return true;          } catch (FileNotFoundException e) {return false; } catch (IOException E) {return false;                  } finally {try {if (out! = null) out.close ();              if (in = null) In.close ();              } catch (IOException e) {e.printstacktrace ();   }          }      }

　　

How to copy an entire folder:

 /** * Copy the contents of the entire directory * * @param srcdirname * Directory name of the directory to be copied * @param destdirname *  Target directory name * @param overlay * If the destination directory exists, overwrite * @return If the copy succeeds returns TRUE, otherwise false */public           Static Boolean CopyDirectory (String srcdirname, String destdirname, Boolean overlay) {//To determine if the source directory exists          File Srcdir = new file (srcdirname); if (!srcdir.exists ()) {MESSAGE = "Copy directory failed: Source directory" + Srcdirname + "does not exist!              ";              Joptionpane.showmessagedialog (null, MESSAGE);          return false; The Else if (!srcdir.isdirectory ()) {MESSAGE = "copy directory failed:" + Srcdirname + "is not a directory!              ";              Joptionpane.showmessagedialog (null, MESSAGE);          return false; }//If the target directory name does not end with a file delimiter, add the file delimiter if (!destdirname.endswith (File.separator)) {destDirName          = destDirName + file.separator;  } File DestDir = new file (destdirname);        If the destination folder exists if (Destdir.exists ()) {//If overwrite is allowed delete the existing target directory if (overlay) {              New File (destdirname). Delete (); } else {MESSAGE = "failed to replicate directory: Destination directory" + destDirName + "already exists!                  ";                  Joptionpane.showmessagedialog (null, MESSAGE);              return false; }} else {//Create destination directory System.out.println ("Destination directory does not exist, prepare to create ...              "); if (!destdir.mkdirs ()) {System.out.println ("failed to replicate directory: Failed to create destination directory!")                  ");              return false;          }} Boolean flag = true;          file[] files = srcdir.listfiles (); for (int i = 0; i < files.length; i++) {//Copy file if (Files[i].isfile ()) {FL AG = Copyfileutil.copyfile (Files[i].getabsolutepath (), destDirName + files[i].getname (), overlay)                  ;        if (!flag) break;      } else if (Files[i].isdirectory ()) {flag = Copyfileutil.copydirectory (), Files[i].getabsolutepath (),                  destDirName + files[i].getname (), overlay);              if (!flag) break; }} if (!flag) {MESSAGE = "copy directory" + Srcdirname + "to" + destDirName + "failed!              ";              Joptionpane.showmessagedialog (null, MESSAGE);          return false;          } else {return true;          }} public static void Main (string[] args) {String srcdirname = "C:/test/test0/test1";          String destdirname = "C:/TTT";      Copyfileutil.copydirectory (Srcdirname, destDirName, true);  }  }

　　

Java File copy function