使用 JavafX 和 FXML 的多折线图系列答案

【问题标题】：Multiple lineChart series with JavaX and FXML使用 JavafX 和 FXML 的多折线图系列
【发布时间】：2020-05-10 17:59:52
【问题描述】：

我正在尝试使用 JavaFX 调整图表模型 (lineChart)，首先基于此链接模型： https://docs.oracle.com/javafx/2/charts/line-chart.htm

我的问题是显示 X 轴值（在我的例子中是几个月）

我已尝试根据这些其他链接使其更具动态性，但仍然无法正常工作... //JavaFX Adding multiple XYChart.Series to LineChart without explicating declaring each series //How to plot multiple series with javafx line chart which is in array list

最后，基于此链接，我能够构建一个动态图，它创建系列来表示系列运动的月份/年份： //Is it possible to create an array of XYChart.Series on JavaFX?

我有一个“小”细节我还不能解决，模型是直接创建“场景”的，没有XML，这样可以正常工作。

但我想用 XML 来创建（我正在使用 Scene Builder 来组装 XML），将更多的细节放在屏幕上，例如 TableView 等。

正如我上面提到的，问题是当我将图表与 XML 一起使用时，它不显示 X 轴的值（在我的例子中是月份）它是“全部在一个列中”......

我希望你设法解释......我将把试图适应的例子留在这里，任何帮助，提前谢谢你。

我将保留示例程序（更简单，而不是动态组装的程序，以更好地说明）。

“场景”调用类

import javafx.application.Application;
    import javafx.fxml.FXMLLoader;
    import javafx.scene.Parent;
    import javafx.scene.Scene;
    import javafx.stage.Stage;

    public class LineChartExemplo extends Application {
        @Override
        public void start(Stage stage) throws Exception {
            Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));

            Scene scene = new Scene(root);

            stage.setScene(scene);
            stage.show();
        }

        public static void main(String[] args) {
            launch(args);
        }
    }

FXML 文件

<?xml version="1.0" encoding="UTF-8"?>

    <?import javafx.scene.chart.CategoryAxis?>
    <?import javafx.scene.chart.LineChart?>
    <?import javafx.scene.chart.NumberAxis?>
    <?import javafx.scene.control.Button?>
    <?import javafx.scene.control.Label?>
    <?import javafx.scene.layout.AnchorPane?>

    <AnchorPane id="AnchorPane" prefHeight="579.0" prefWidth="918.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.171" fx:controller="linechartexemplo.FXMLDocumentController">
        <children>
            <Button fx:id="button" layoutX="14.0" layoutY="14.0" onAction="#handleButtonAction" text="Visualizar Gráfico" />
            <Label fx:id="label" layoutX="135.0" layoutY="14.0" minHeight="16" minWidth="69" prefHeight="25.0" prefWidth="710.0" />
          <LineChart fx:id="lineChart" layoutX="14.0" layoutY="52.0" prefHeight="512.0" prefWidth="887.0" title="Exemplo Gŕafico">
            <xAxis>
              <CategoryAxis side="BOTTOM" />
            </xAxis>
            <yAxis>
              <NumberAxis side="LEFT" />
            </yAxis>
          </LineChart>
        </children>
    </AnchorPane>

控制器类

import java.net.URL;
    import java.util.ResourceBundle;
    import javafx.event.ActionEvent;
    import javafx.fxml.FXML;
    import javafx.fxml.Initializable;
    import javafx.scene.chart.CategoryAxis;
    import javafx.scene.chart.LineChart;
    import javafx.scene.chart.NumberAxis;
    import javafx.scene.chart.XYChart;
    import javafx.scene.control.Label;

    public class FXMLDocumentController implements Initializable {
        @FXML private Label label;

        final CategoryAxis xAxis = new CategoryAxis();
        final NumberAxis yAxis = new NumberAxis();
        //final LineChart<String,Number> lineChart = new LineChart<String,Number>(xAxis,yAxis);
        //@FXML private LineChart<String, Number> lineChart;
        @FXML private LineChart<String, Number> lineChart = new LineChart<String,Number>(xAxis,yAxis);


        @FXML
        private void handleButtonAction(ActionEvent event) {
            label.setText("Teste Gráfico...");
            visualizaGrafico();
        }

        @Override
        public void initialize(URL url, ResourceBundle rb) {

        }    

        private void visualizaGrafico(){
            lineChart.setTitle("Exemplo Gráfico");
            yAxis.setLabel("Valores");
            xAxis.setLabel("Meses");

            XYChart.Series series = new XYChart.Series();
            series.setName("Ano: 2018");
            series.getData().add(new XYChart.Data("Jan", 23));
            series.getData().add(new XYChart.Data("Feb", 14));
            series.getData().add(new XYChart.Data("Mar", 15));
            series.getData().add(new XYChart.Data("Apr", 24));
            series.getData().add(new XYChart.Data("May", 34));
            series.getData().add(new XYChart.Data("Jun", 36));
            series.getData().add(new XYChart.Data("Jul", 22));
            series.getData().add(new XYChart.Data("Aug", 45));
            series.getData().add(new XYChart.Data("Sep", 43));
            series.getData().add(new XYChart.Data("Oct", 17));
            series.getData().add(new XYChart.Data("Nov", 29));
            series.getData().add(new XYChart.Data("Dec", 25));

            XYChart.Series series2 = new XYChart.Series();
            series2.setName("Ano: 2019");
            series2.getData().add(new XYChart.Data("Jan", 28));
            series2.getData().add(new XYChart.Data("Feb", 17));
            series2.getData().add(new XYChart.Data("Mar", 19));
            series2.getData().add(new XYChart.Data("Apr", 14));
            series2.getData().add(new XYChart.Data("May", 20));
            series2.getData().add(new XYChart.Data("Jun", 42));
            series2.getData().add(new XYChart.Data("Jul", 27));
            series2.getData().add(new XYChart.Data("Aug", 48));
            series2.getData().add(new XYChart.Data("Sep", 47));
            series2.getData().add(new XYChart.Data("Oct", 19));
            series2.getData().add(new XYChart.Data("Nov", 39));
            series2.getData().add(new XYChart.Data("Dec", 29));

            lineChart.getData().addAll(series, series2);
        }
    }

打印图表以更好地说明。

不使用 XML 的图表（可以使用数据库）

【问题讨论】：

对不起英文，我是在谷歌翻译的帮助下写的，我来自巴西，圣保罗。
为什么要在控制器中创建新轴，而不是使用 FXML 文件中定义的轴？此外，像使用 lineChart 那样初始化带注解 @FXML 的变量总是是错误的。
你也可以发布这个的非 FXML 版本吗？

标签： javafx

【解决方案1】：

看起来某处存在一个错误，导致图表在动画时无法正常工作。用

关闭图表中的动画

@Override
public void initialize(URL url, ResourceBundle rb) {
    lineChart.setAnimated(false);
}

您的代码还有其他问题：

切勿在控制器中初始化注释为 @FXML 的字段。这些字段应该引用的对象是FXMLLoader根据FXML代码创建的，并通过注入在控制器中初始化。

当您已经在 FXML 文件中定义了轴时，还不清楚为什么要在控制器中创建第二组轴。

替换此代码：

    final CategoryAxis xAxis = new CategoryAxis();
    final NumberAxis yAxis = new NumberAxis();
    @FXML private LineChart<String, Number> lineChart = new LineChart<String,Number>(xAxis,yAxis);

与

    @FXML private CategoryAxis xAxis ;
    @FXML private NumberAxis yAxis ;
    @FXML private LineChart<String, Number> lineChart ;

并将fx:ids 添加到 FXML 文件中的轴，以便它们正确地注入控制器：

      <LineChart fx:id="lineChart" layoutX="14.0" layoutY="52.0" prefHeight="512.0" prefWidth="887.0" title="Exemplo Gŕafico">
        <xAxis>
          <CategoryAxis fx:id="xAxis" side="BOTTOM" />
        </xAxis>
        <yAxis>
          <NumberAxis fx:id="yAxis" side="LEFT" />
        </yAxis>
      </LineChart>

【讨论】：

感谢反馈...我刚刚发现了“奇怪”的细节，当它第二次运行时，它工作正常...开始禁用图形动画的提示是正确... lineChart.setAnimated (false);然后当我再次运行第二次时，我启用它，因为可视化更有趣......我将在问题中“放一个答案”，并留下代码，以供以后对某人有用。跨度>

【解决方案2】：

我将解决方案代码放在这里，以后可以对其他人有用。

我正在使用 SQL Server for Database (2012) 和 NetBeanas 来开发...

类开始场景

package graficos;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Graficos extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("FXMLGraficos.fxml"));

        Scene scene = new Scene(root);

        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

FXMLGraficos 文件

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.chart.BarChart?>
<?import javafx.scene.chart.CategoryAxis?>
<?import javafx.scene.chart.LineChart?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.chart.PieChart?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.DatePicker?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.effect.DropShadow?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane id="AnchorPane" prefHeight="701.0" prefWidth="1407.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="graficos.FXMLGraficosController">
   <children>
      <AnchorPane layoutX="7.0" layoutY="152.0" prefHeight="254.0" prefWidth="361.0" style="-fx-background-color: #F5F5F5;">
         <children>
            <PieChart fx:id="pieChart" layoutX="7.0" prefHeight="254.0" prefWidth="355.0" title="Gráfico Movimento" />
         </children>
         <effect>
            <DropShadow />
         </effect>
      </AnchorPane>
      <AnchorPane layoutX="6.0" layoutY="14.0" prefHeight="131.0" prefWidth="363.0" style="-fx-background-color: #F5F5F5;">
         <effect>
            <DropShadow />
         </effect>
         <children>
            <DatePicker fx:id="dtpInicial" layoutX="5.0" layoutY="43.0" prefHeight="25.0" prefWidth="106.0" />
            <Label layoutX="5.0" layoutY="24.0" text="Data Inicial:" />
            <DatePicker fx:id="dtpFinal" layoutX="124.0" layoutY="43.0" prefHeight="25.0" prefWidth="106.0" />
            <Label layoutX="124.0" layoutY="24.0" text="Data Final:" />
            <Button fx:id="btnOK" layoutX="247.0" layoutY="43.0" mnemonicParsing="false" onAction="#verificaData" prefHeight="34.0" prefWidth="61.0" text="OK" />
            <Label fx:id="lblData" layoutX="12.0" layoutY="86.0" prefHeight="26.0" prefWidth="296.0" text="-" />
         </children>
      </AnchorPane>
      <AnchorPane layoutX="7.0" layoutY="417.0" prefHeight="271.0" prefWidth="363.0" style="-fx-background-color: #F5F5F5;">
         <effect>
            <DropShadow />
         </effect>
         <children>
            <BarChart fx:id="barChart" prefHeight="271.0" prefWidth="363.0" title="Gráfico Movimento">
              <xAxis>
                <CategoryAxis side="BOTTOM" />
              </xAxis>
              <yAxis>
                <NumberAxis side="LEFT" />
              </yAxis>
            </BarChart>
         </children>
      </AnchorPane>
      <AnchorPane layoutX="379.0" layoutY="153.0" prefHeight="535.0" prefWidth="975.0" style="-fx-background-color: #F5F5F5;">
         <effect>
            <DropShadow />
         </effect>
         <children>
            <LineChart fx:id="lineChart" layoutX="-2.0" prefHeight="535.0" prefWidth="968.0">
              <xAxis>
                <CategoryAxis side="BOTTOM" fx:id="xAxis" />
              </xAxis>
              <yAxis>
                <NumberAxis fx:id="yAxis" side="LEFT" />
              </yAxis>
            </LineChart>
         </children>
      </AnchorPane>
      <AnchorPane layoutX="379.0" layoutY="14.0" prefHeight="131.0" prefWidth="975.0" style="-fx-background-color: #F5F5F5;">
         <effect>
            <DropShadow />
         </effect>
         <children>
            <TableView prefHeight="131.0" prefWidth="975.0">
               <columns>
                  <TableColumn prefWidth="62.0" text="Janeiro" />
                  <TableColumn prefWidth="72.0" text="Fevereiro" />
                  <TableColumn prefWidth="79.0" text="Março" />
                  <TableColumn prefWidth="79.0" text="Abril" />
                  <TableColumn prefWidth="76.0" text="Maio" />
                  <TableColumn prefWidth="87.0" text="Junho" />
                  <TableColumn prefWidth="89.0" text="Julho" />
                  <TableColumn prefWidth="87.0" text="Agosto" />
                  <TableColumn prefWidth="83.0" text="Setembro" />
                  <TableColumn minWidth="0.0" prefWidth="81.0" text="Outubro" />
                  <TableColumn minWidth="0.0" prefWidth="79.0" text="Novembro" />
                  <TableColumn prefWidth="115.0" text="Dezembro" />
               </columns>
            </TableView>
         </children>
      </AnchorPane>
   </children>
</AnchorPane>

FXMLGraficosController 类

package graficos;

import Utilitarios.ConexaoBD;
import java.net.URL;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.Date;
import java.util.ResourceBundle;
import java.util.stream.Stream;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.PieChart;
import javafx.scene.chart.XYChart;
import javafx.scene.control.Button;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javax.swing.JOptionPane;

public class FXMLGraficosController implements Initializable {
    @FXML private DatePicker dtpInicial;
    @FXML private DatePicker dtpFinal;
    @FXML private Button btnOK;
    @FXML private PieChart pieChart;
    @FXML private BarChart<String, Double> barChart;
    @FXML private LineChart<String, Number> lineChart;
    @FXML private Label lblData;

    ObservableList<PieChart.Data> pieChartData;
    ObservableList<PieChart.Data> lineChartData;
    //ArrayList<Integer> cell = new ArrayList<Integer>();
    //ArrayList<String> name  = new ArrayList<String>();

    ConexaoBD connBD;

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        connBD = new ConexaoBD();
        dtpInicial.setValue(LocalDate.now());
        dtpFinal.setValue(LocalDate.now());
    }    

    public void verificaData(javafx.event.ActionEvent event){
        //String sData = dtpInicial.getValue().format(DateTimeFormatter.ofPattern("yyyy-mm-dd"));
        java.sql.Date dDataIni = java.sql.Date.valueOf(dtpInicial.getValue());
        java.sql.Date dDataFim = java.sql.Date.valueOf(dtpFinal.getValue());

        String sDataIni = formataDataStr(dDataIni,1);
        String sDataFim = formataDataStr(dDataFim,1);

        lblData.setText("Período : " + sDataIni + " à " + sDataFim);

        graficoPizza(sDataIni, sDataFim);
        graficoLinhas(sDataIni, sDataFim);
    }

    public void graficoPizza(String sDataIni, String sDataFim){
        String strSQL = null;
        strSQL = " SELECT 'Boleto' AS Doacao, 'Valor' =  COUNT(*)" +
                 " FROM BOLETO B " +
                 " WHERE B.BOLDATAVEN BETWEEN '"+sDataIni+"' AND '"+sDataFim+"' ";

        strSQL = strSQL + " UNION ALL";
        strSQL = strSQL + " SELECT 'Recibo' AS Doacao, 'Valor' =  COUNT(*)" +
                          " FROM RECIBO R " +
                          " WHERE R.RECDATAVEN BETWEEN '"+sDataIni+"' AND '"+sDataFim+"' ";

        strSQL = strSQL + " UNION ALL";
        strSQL = strSQL + " SELECT 'Debito' AS Doacao, 'Valor' =  COUNT(*)" +
                          " FROM DEBITO D " +
                          " WHERE D.DEBDATAVEN BETWEEN '"+sDataIni+"' AND '"+sDataFim+"' ";

        pieChartData = FXCollections.observableArrayList();

        try {
            connBD.conectaBD();
        } catch (ClassNotFoundException ex) {
            JOptionPane.showMessageDialog(null, "Erro ao Conectar Banco de Dados - ERRO :" + ex.getMessage());
        }

        try {
            connBD.executaSQL(strSQL); //Conecta no Banco conforme Parametro passado
            if (connBD.rs.isBeforeFirst()){
                while (connBD.rs.next()){
                    pieChartData.add(new PieChart.Data(connBD.rs.getString("Doacao"), connBD.rs.getInt("Valor")));
                    //name.add(connBD.rs.getString("Doacao"));
                    //cell.add(connBD.rs.getInt("Valor"));
                    System.out.println(connBD.rs.getString("Doacao") + " - " +connBD.rs.getString("Valor"));
                }
            }

            pieChart.setData(pieChartData);

            connBD.desconectaBD();
        } catch (SQLException ex) {
            JOptionPane.showMessageDialog(null, "Erro ao Carregar Dados para Alteração!\n" + ex.getMessage());
        }
    }

    public void graficoLinhas(String sDataIni, String sDataFim){
        final CategoryAxis xAxis = new CategoryAxis();
        final NumberAxis yAxis   = new NumberAxis();

        xAxis.setLabel("Meses");       
        yAxis.setLabel("Valores");  

        lineChart.getData().clear();
        ArrayList arrayAno = new ArrayList();

        String sSQL =  null;
        sSQL =   montaStrSQL(sDataIni, sDataFim);

        try {
            connBD.conectaBD();
        } catch (ClassNotFoundException ex) {
            JOptionPane.showMessageDialog(null, "Erro ao Conectar Banco de Dados - ERRO :" + ex.getMessage());
        }

        try {

            connBD.executaSQL(sSQL); //Conecta no Banco conforme Parametro passado
            if (connBD.rs.isBeforeFirst()){
                try {
                    connBD.rs.beforeFirst();
                    while (connBD.rs.next()){
                        if(!arrayAno.contains(connBD.rs.getString("Ano"))){
                            arrayAno.add(connBD.rs.getString("Ano"));
                            System.out.println(connBD.rs.getString("Ano"));
                        }
                    }
                    connBD.rs.beforeFirst();
                } catch (SQLException ex) {
                    JOptionPane.showMessageDialog(null, "Erro ao Carregar Dados para Alteração!\n" + ex.getMessage());
                }

                XYChart.Series<String, Number>[] seriesArray = Stream.<XYChart.Series<String, Number>>generate(XYChart.Series::new).limit(arrayAno.size()).toArray(XYChart.Series[]::new);

                for (int i = 0; i < arrayAno.size(); i++) {
                    try {
                        while (connBD.rs.next() && connBD.rs.getString("Ano").equals(arrayAno.get(i).toString())){
                            seriesArray[i].getData().add(new XYChart.Data(retornaMes(connBD.rs.getInt("Mes")), connBD.rs.getInt("Qtde")));
                            System.out.println(connBD.rs.getString("Ano") + " - " + connBD.rs.getString("Mes") + " - " + connBD.rs.getString("Qtde"));
                        }
                        seriesArray[i].setName("Ano: " + arrayAno.get(i).toString());
                        lineChart.getData().add(seriesArray[i]);

                        if (!connBD.rs.isLast())
                            connBD.rs.previous();

                    } catch (SQLException ex) {
                        JOptionPane.showMessageDialog(null, "Erro ao Carregar Dados para Alteração!\n" + ex.getMessage());
                    }
                }
            }
            connBD.desconectaBD();
        } catch (SQLException ex) {
            JOptionPane.showMessageDialog(null, "Erro ao Carregar Dados para Alteração!\n" + ex.getMessage());
        }
    }

    private String montaStrSQL(String sDataI, String sDataF){
        String strSQL = null;
        strSQL = "SELECT ANO, MES, SUM(QTDE) AS QTDE FROM (";

        strSQL = strSQL + " SELECT 'Ano' = YEAR(B.BOLDATAVEN), 'Mes' = MONTH(B.BOLDATAVEN), 'Qtde' =  COUNT(*)" +
                          " FROM BOLETO B " +
                          " WHERE B.BOLDATAVEN BETWEEN '"+sDataI+"' AND '"+sDataF+"' ";

        strSQL = strSQL + " GROUP BY YEAR(B.BOLDATAVEN), MONTH(B.BOLDATAVEN)";
        strSQL = strSQL + " UNION ALL";

        strSQL = strSQL + " SELECT 'Ano' = YEAR(R.RECDATAVEN), 'Mes' = MONTH(R.RECDATAVEN), 'Qtde' =  COUNT(*)" +
                          " FROM RECIBO R " +
                          " WHERE R.RECDATAVEN BETWEEN '"+sDataI+"' AND '"+sDataF+"' ";

        strSQL = strSQL + " GROUP BY YEAR(R.RECDATAVEN), MONTH(R.RECDATAVEN)";
        strSQL = strSQL + " UNION ALL";
        strSQL = strSQL + " SELECT 'Ano' = YEAR(D.DEBDATAVEN), 'Mes' = MONTH(D.DEBDATAVEN), 'Qtde' =  COUNT(*)" +
                          " FROM DEBITO D " +
                          " WHERE D.DEBDATAVEN BETWEEN '"+sDataI+"' AND '"+sDataF+"' ";
        strSQL = strSQL + " GROUP BY YEAR(D.DEBDATAVEN), MONTH(D.DEBDATAVEN)";

        strSQL = strSQL + ")Resultado";
        strSQL = strSQL + " GROUP BY Resultado.ANO, Resultado.MES" ;
        strSQL = strSQL + " ORDER BY Resultado.ANO, Resultado.MES" ;

        return strSQL;
    }

    private String retornaMes(int iMes){
        String sMes = null;

        if (iMes == 1) sMes = "Jan";
        else if (iMes == 2) sMes  = "Fev";
        else if (iMes == 3) sMes  = "Mar";
        else if (iMes == 4) sMes  = "Abr";
        else if (iMes == 5) sMes  = "Mai";
        else if (iMes == 6) sMes  = "Jun";
        else if (iMes == 7) sMes  = "Jul";
        else if (iMes == 8) sMes  = "Ago";
        else if (iMes == 9) sMes  = "Set";
        else if (iMes == 10) sMes = "Out";
        else if (iMes == 11) sMes = "Nov";
        else if (iMes == 12) sMes = "Dez";

        return sMes;
    }

    public String formataDataStr(Date dData, int iOpc){
        if (dData != null){
          //JOptionPane.showMessageDialog(null, "Validando Data...");
          SimpleDateFormat sdf;

          switch (iOpc) {
            case 1:
              sdf = new SimpleDateFormat("yyyy-MM-dd");
              break;
            case 2:
              sdf = new SimpleDateFormat("dd-MM-yyyy");
              break;
            default:
              sdf = new SimpleDateFormat("dd/MM/yyyy");
              break;
          }

          String sDataFormat = sdf.format(dData);
          return sDataFormat;
        } else {
          //JOptionPane.showMessageDialog(null, "Retorno data vazio...");
          return "";
        }
    }
}

BD类

package Utilitarios;
import java.sql.*;
import javax.swing.JOptionPane;

public class ConexaoBD {
    public Connection conn = null;
    public Statement stm   = null;
    public ResultSet rs    = null;

    private final String driverDB = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; //Nome do Driver conforme o BD a ser utilizado
    private final String strDB    = "jdbc:sqlserver://"; //String para montar Url Banco
    private final String strIP    = "XXX.X.XX.XX";       //IP do Servidor
    private final String portaDB  = ":1433;";            //Porta  para montar Url Banco
    private String nomeDB         = "yourBD";            /Nome do Banco de Dados
    private String usuarioDB      = "youUSer";           //**
    private String senhaDB        = "yourPassword";      //**
    private String connectionUrl  = null;

    public void conectaBD() throws ClassNotFoundException{ //Inicia Construtor
        try {
            try {
                Class.forName(driverDB);
                connectionUrl = strDB + strIP + portaDB + "databaseName=" + nomeDB + ";user=" + usuarioDB + ";password=" + senhaDB;
                conn = DriverManager.getConnection(connectionUrl);
                stm  = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
            } catch (Exception ex) {
                JOptionPane.showMessageDialog(null, "Erro ao Carregar Arquivo Configurações BD (ConexaoBD: conectaBD()):\n"+ex.getMessage());
            }
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(null, "Erro Conexão BD - IP:\n"+ex.getMessage());
        }
    }

    public void desconectaBD(){
        try {
            conn.close();
        } catch (SQLException ex) {
            JOptionPane.showMessageDialog(null, "Erro ao Desconectar Banco de Dados (ConexaoBD: desconectaBD())\n"+ex.getMessage());
        }
    }

    public void executaSQL(String strSQL){
        try {
            rs  = stm.executeQuery(strSQL);
        } catch (SQLException ex) {
            JOptionPane.showMessageDialog(null, "Erro na Execução SQL (ConexaoBD: executaSQL())\n Erro: "+ex.getMessage() );
        }
    }
}

还有执行的打印……现在我可以继续填写表格等部分了……

谢谢大家！

【讨论】：