在SWT中使用由SwingWorker生成的tablemodel

时间:2014-02-22 15:44:07

标签: java jtable swingworker tablemodel

我有用于创建表模型的Swingworker,用于在程序启动时更新jTable。但我不知道如何从EDT调用此模型并将此模型应用于我的jtable?

这是我的Swingworker代码;

public class FillTable extends SwingWorker<DefaultTableModel, DefaultTableModel> {
    private final DefaultTableModel model;
    public FillTable(DefaultTableModel model) {
     this.model = model;
    }

   @Override
 protected DefaultTableModel doInBackground() throws Exception {
        ResultSet rsaccounts;
        Statement stmt;
        String queryaccounts = "select NAME from acc (nolock)\n" + "order by Name";

        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        String connectionUrl = "jdbc:sqlserver://192.100.100.23;" + "databaseName=Dbacc;" + "user=" + "sa" + ";" + "password=" + "sapassword!" + ";"; 
        Connection con = DriverManager.getConnection(connectionUrl);
        stmt = con.createStatement();
        rsaccounts = stmt.executeQuery(queryaccounts);
        ResultSetMetaData rsmd = rsaccounts.getMetaData();


        Vector<String> columnNames = new Vector<String>();
        columnNames.add(rsmd.getColumnName(1)); 
        System.out.println(columnNames);
        int columnCount = rsmd.getColumnCount();

        Vector<Vector<Object>> data = new Vector<Vector<Object>>();

       while (rsaccounts.next()) {
            Vector<Object> vector = new Vector<Object>();
            for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) {
            vector.add(rsaccounts.getObject(columnIndex));
            }
            data.add(vector);
       }

        rsaccounts.close();
        stmt.close();
        model = new DefaultTableModel(data, columnNames);
        return model;
    }


  protected void done() {
    try {
        TableModel model = get();
    } catch (InterruptedException | ExecutionException ex) {
        ex.printStackTrace();
    }
  }

}

下面的方法返回错误; 线程“AWT-EventQueue-0”中的异常java.lang.IllegalArgumentException:无法设置null TableModel

private DefaultTableModel model1;

FillTable fff = new FillTable(model1);
        fff.execute();
        model1 = fff.model;

        jTable3.setModel(model1);

1 个答案:

答案 0 :(得分:1)

执行

之类的操作时
FillTable fff = new FillTable(model1);
fff.execute();
model1 = fff.model;
jTable3.setModel(model1);

然后行<{1}}很可能在 SwingWorker完成之前执行model1 = fff.model调用将导致工作在后台完成,无论工作是否已完成,都可以执行下一行。

一般方法可能是在execute方法中使用该模型,大致,如下所示:

done()

(为此,您必须将protected void done() { try { TableModel model = get(); jTable3.setModel(model); // Use it here! } catch (InterruptedException | ExecutionException ex) { ex.printStackTrace(); } } 的引用传递给SwingWorker - 也就是说,将其传递给构造函数并将其作为字段存储在SwingWorker中)。

可能有更优雅的解决方案,但基于目前提供的代码,这至少似乎是错误的原因和可能的解决方案。