我的JavaFx應用程序執行速度很慢

Question

我在做一個連接到文檔數據存儲的JavaFx項目。最近我注意到，在某些特定點上它表現得相當慢。一旦開始運行，它會從文檔中檢索一些數據，這些數據考慮到數據量會相當快，並創建我定義的類的實例，以便將它們加載到表中（至此仍然可以）。我是這樣做的功能：

public void createCheckbox() { 
     List<String> columnnames = Arrays.asList("id", "name", "bg", "country","countryCode", "status", 
       "incorporationDate","aclName","aclDomain"); 
     for (int i = 0; i <= columnnames.size() - 1 ; i++) { 
      ColumnConstraints column1 = new ColumnConstraints(); 
      column1.setPercentWidth(22.0); 

      gridChkBoxContainer.getColumnConstraints().add(column1); 
      CheckBox cbs = new CheckBox(columnnames.get(i)); 
      cbs.selectedProperty().set(true); 
      gridChkBoxContainer.add(cbs, i, 0); 
     } 
    } 


    public void createTable() { 
     int count = 0 ; 
     infoTable.getColumns().clear(); 
     CheckBox cb; 
     ObservableList<Node> childrens = gridChkBoxContainer.getChildren(); 
     for (Node node : childrens) { 
      cb = (CheckBox) node; 
      if (cb.isSelected()) { 
       TableColumn Col = new TableColumn(cb.getText()); 
       Col.prefWidthProperty().bind(infoTable.widthProperty().divide(6)); 
       Col.setCellValueFactory(new PropertyValueFactory<Report, String>(cb.getText())); 
       infoTable.getColumns().add(Col); 
      } 
     } 

     try{ 
      infoTable.getItems().clear(); 
      if (txtKeyword.getText().compareTo("") == 0){ 


      strDQL = "select dm_dbo.cosec_general_view.name , dm_dbo.cosec_general_view.comp_id , dm_dbo.cosec_general_view.bg_name , dm_dbo.cosec_general_view.incorporation_date , dm_dbo.cosec_general_view.status , dm_dbo.cosec_general_view.country_name , cosec_general.acl_domain , cosec_general.acl_name , cosec_general.country_code from dm_dbo.cosec_general_view , cosec_general where dm_dbo.cosec_general_view.comp_id =cosec_general.comp_id"; 
      }else{ 
       strDQL = "select dm_dbo.cosec_general_view.name , dm_dbo.cosec_general_view.comp_id , dm_dbo.cosec_general_view.bg_name , dm_dbo.cosec_general_view.incorporation_date , dm_dbo.cosec_general_view.status , dm_dbo.cosec_general_view.country_name , cosec_general.acl_domain , cosec_general.acl_name , cosec_general.country_code from dm_dbo.cosec_general_view , cosec_general where dm_dbo.cosec_general_view.comp_id =cosec_general.comp_id and (UPPER(dm_dbo.cosec_general_view.comp_id) like UPPER('@aclname') or UPPER(dm_dbo.cosec_general_view.name) like UPPER('@aclname')or UPPER(dm_dbo.cosec_general_view.bg_name) like UPPER('@aclname') or UPPER(dm_dbo.cosec_general_view.incorporation_date) like UPPER('@aclname') or UPPER(dm_dbo.cosec_general_view.country_name) like UPPER('@aclname') or UPPER(dm_dbo.cosec_general_view.status) like UPPER('@aclname') or UPPER(cosec_general.acl_name) like UPPER('@aclname')or UPPER(cosec_general.acl_domain) like UPPER('@aclname')or UPPER(cosec_general.country_code) like UPPER('@aclname'))"; 

       String searchVar = "%"+txtKeyword.getText()+"%"; 
       strDQL = strDQL.replace("@aclname", searchVar); 

      } 
      IDfQuery ACLQuery = new DfQuery(); 
      ACLQuery.setDQL(strDQL); 
      IDfCollection col = ACLQuery.execute(_session, DfQuery.DF_READ_QUERY); 
      while (col.next()) { 
       BGDetails bgInfo = new BGDetails(col.getString("comp_id"), col.getString("name"), col.getString("bg_name"), 
         col.getString("country_name"), col.getString("status"), col.getString("incorporation_date"),col.getString("acl_name"),col.getString("acl_domain"),col.getString("country_code")); 

       infoTable.getItems().add(bgInfo); 
       count++; 

      }}catch(Exception e){ 
       Alert alert = new Alert (Alert.AlertType.ERROR , "An Error was found!"); 
       alert.showAndWait(); 
      } 


    if (count == 0){ 
     Alert alert = new Alert(Alert.AlertType.WARNING , "No search result was found !"); 
     alert.showAndWait(); 

    } 
    } 

再有就是文本字段：頂部是通過數據搜索（FX ID =「txtKeyword」）。值得一提的是，爲了達到這個目的而不是存儲我之前提取的數據，我會創建並定製一個新的DQL，以便再次從數據存儲中重新獲取數據。我注意到，在這一點上，並不是需要很長時間才能運行的數據檢索，而是在搜索字段中輸入單詞的鍵值明顯滯後。或者換句話說，每次我想用鍵盤或鼠標瀏覽應用程序時，它都會開始滯後，其他時間也可以。任何想法如何提高性能的速度？ 在此先感謝:)

Answer 1

任何與JavaFX Thread無關的事情都可以在外部Thread上完成，特別是數據庫查詢的東西。 JavaFX的服務的

實施例結構[tutorial]（下面是使用SQLITE爲例）：

public class DataLoader extends Service<Boolean> { 

    int total; 

    /** 
    * Constructor 
    */ 
    public DataLoader() { 

     // if succeeded 
     setOnSucceeded(s -> { 
      //code if Service succeeds 
     }); 

     // if failed 
     setOnFailed(fail -> { 
      //code it Service fails 
     }); 

     //if canceled 
     setOnCancelled(cancelled->{ 
      //code if Service get's cancelled 
     }); 
    } 

    @Override 
    protected Task<Boolean> createTask() { 
     return new Task<Boolean>() { 
      @Override 
      protected Void call() throws Exception { 

       // -------------------------- Load all the libraries 
       try (ResultSet resultSet = connection1.createStatement().executeQuery("SELECT* FROM LIBRARIES;"); 
         ResultSet dbCounter = connection1.createStatement() 
           .executeQuery("SELECT COUNT(*) FROM LIBRARIES;");) { 

        total = dbCounter.getInt(1); 
        Main.logger.info("Uploading libraries...."); 

        // Refresh the text 
        Platform.runLater(() -> Main.updateScreen.label.setText("Uploading Libraries...")); 
        updateProgress(1, 2); 

        // Load all the libraries 
        while (resultSet.next()) { 

         Library library = new Library(resultSet.getString("NAME"), resultSet.getString("TABLENAME"), 
           resultSet.getDouble("STARS"), resultSet.getString("DATECREATED"), 
           resultSet.getString("TIMECREATED"), resultSet.getString("DESCRIPTION"), 
           resultSet.getInt("SAVEMODE"), resultSet.getInt("POSITION"), 
           resultSet.getString("LIBRARYIMAGE"), resultSet.getBoolean("OPENED")); 

         //Using Platform Later to Modify JavaFX Nodes 
         Platform.runLater(()->{ 
          //code here 
         }); 

         updateProgress(resultSet.getRow(), total); 
        } 

       } catch (Exception ex) { 
        Main.logger.log(Level.SEVERE, "", ex); 
        return false //something bad happened 
       } 

       return true; 
      } 
     }; 
    } 

}