Java JTable table Get storage path, file name, export Excel table

In the metering pump host computer software, you need to transfer data from the next computer, stored in the MySQL database, displayed in the Java host computer interface, and can be exported to the computer designated location.

Select the storage path and file name:

    //menu for working with saved files      Public voidexportexcelfile (String sql,string []paras) {string Absolutepath=""; //setting the style of the dialog box      Try{Uimanager.setlookandfeel (Uimanager.getsystemlookandfeelclassname ()); } Catch(Exception E1) {//TODO auto-generated Catch blockE1.printstacktrace (); } jfilechooser JFileChooser=NewJFileChooser (); //jfilechooser.setmultiselectionenabled (true);//If you want to choose more, you can set this sentence//Set the default save file name, note that if this is set, you will not be able to get the file storage path after the user changed, because the Jfilechooser.getcurrentdirectory ()//is the path to the default file you set//Jfilechooser.setselectedfile (New//file ("default name");       intresult = Jfilechooser.showsavedialog (NULL); Switch(Result) { CaseJFileChooser.APPROVE_OPTION:System.out.println ("11"); //This approach is to save the user input as a saved file name as an Excel table. xlsAbsolutepath = jfilechooser.getcurrentdirectory () + File.separator +jfilechooser.getselectedfile (). GetName ()+ ". xls";           //.xls can also specify other formats for output Excel tables SqlHelper SqlHelper=NewSqlHelper (); ResultSet RS=Sqlhelper.query (SQL, paras); File File=NewFile (Absolutepath); Try {                This.writeexcel (rs, file);//Export Data method}Catch(SQLException E1) {e1.printstacktrace (); } joptionpane.showmessagedialog (NULL, "Export Data successfully!" ");  Break;  CaseJFileChooser.CANCEL_OPTION:JOptionPane.showMessageDialog (NULL, "Cancel Export!! ");  Break;  Casejfilechooser.error_option://System.out.println ("Wrong!!  ");            Break; }                }

To export a data method:

//Need a result set RS and file files
  Public voidWriteexcel (ResultSet rs,file File)throwssqlexception{Writableworkbook Workbook=NULL; //The ResultSetMetaData can be obtained from the RS object to get the table column nameResultSetMetaData rsmt=Rs.getmetadata (); Try{              //first, use the factory method of the Workbook class to create a writable workbook (Workbook) objectWorkbook =workbook.createworkbook (file); } Catch(IOException e) {e.printstacktrace (); }           if(workbook!=NULL) {Writablesheet Wsheet= Workbook.createsheet ("Sheet1", 0); Try {                  //get the column name of the table                   for(intI=0;i<rsmt.getcolumncount (); i++) {Label label_column1=NewLabel (i, 0, Rsmt.getcolumnname (i+1));                      Wsheet.addcell (LABEL_COLUMN1); }                            } Catch(rowsexceededexception E1) {e1.printstacktrace (); } Catch(WriteException E1) {e1.printstacktrace (); }                        //get the contents of a table              intI=1;  while(Rs.next ()) { for(intJ=0;j<rsmt.getcolumncount (); j + +) {Label Label1=NewLabel (J, I, Rs.getstring (j+1)); Try{Wsheet.addcell (Label1); } Catch(rowsexceededexception e) {e.printstacktrace (); } Catch(WriteException e) {e.printstacktrace (); }} I++; }                   Try {                  //writing files from memoryWorkbook.write (); //close the resource and free up memoryWorkbook.close (); } Catch(IOException e) {e.printstacktrace (); } Catch(WriteException e) {e.printstacktrace (); }          }  }

Java JTable table Get storage path, file name, export Excel table