如何将 ArrayList 添加到 jtable？

Question

我一直致力于 returns 数组列表的网络服务。如何将返回的数组列表添加到 jtable 并显示？

    ArrayList customerDetails = new ArrayList();
    try {
        String sqlQuery = "SELECT * FROM customer WHERE AccountNumber="+accountNumber;
        PreparedStatement stmt = DatabaseConnection.dBconn().prepareStatement(sqlQuery);
        ResultSet rs = stmt.executeQuery();

        while (rs.next()) {

            customerDetails.add(rs.getString("Name"));
            customerDetails.add(rs.getString("DoB"));
            customerDetails.add(rs.getString("Address"));
            customerDetails.add(rs.getString("Mobile"));
            customerDetails.add(rs.getString("Email"));
            customerDetails.add(rs.getString("AccountType"));
            customerDetails.add(rs.getString("AccountNumber"));
            customerDetails.add(rs.getString("SortCode"));
            customerDetails.add(rs.getString("Balance"));
            customerDetails.add(rs.getString("Card"));

        }
        return customerDetails;

    } catch (SQLException err) {
        System.out.println(err.getMessage());
    }
    return customerDetails;

Answer 1

让我们从您的 ArrayList 不是 row/columns 分组的事实开始，您将需要 List 在 List 中，其中外部列表是行，内部列表是列值

在我们这样做的同时，让我们也适当地利用 PreparedStatement 并管理资源，以便在我们这样做的同时正确关闭它们

ArrayList<List<String>> customerDetails = new ArrayList<>(25);
String sqlQuery = "SELECT * FROM customer WHERE AccountNumber=?";
try (PreparedStatement stmt = DatabaseConnection.dBconn().prepareStatement(sqlQuery)) {
    stmt.setString(1, accountNumber);
    try (ResultSet rs = stmt.executeQuery()) {

        while (rs.next()) {
            List<String> rowDetails = new ArrayList<>(10);
            rowDetails.add(rs.getString("Name"));
            rowDetails.add(rs.getString("DoB"));
            rowDetails.add(rs.getString("Address"));
            rowDetails.add(rs.getString("Mobile"));
            rowDetails.add(rs.getString("Email"));
            rowDetails.add(rs.getString("AccountType"));
            rowDetails.add(rs.getString("AccountNumber"));
            rowDetails.add(rs.getString("SortCode"));
            rowDetails.add(rs.getString("Balance"));
            rowDetails.add(rs.getString("Card"));

            customerDetails.add(rowDetails);
        }
    }

} catch (SQLException err) {
    System.out.println(err.getMessage());
}
return customerDetails;

查看 Using Prepared Statements and The try-with-resources Statement 了解更多详情

现在，我们需要一个 TableModel 可以在非常基础的水平上支持它...

public class ListTableModel extends AbstractTableModel {

    private List<List<String>> rows;
    private List<String> columnNames;

    public ListTableModel(List<String> columnNames, List<List<String>> rows) {
        this.rows = new ArrayList<>(rows);
        this.columnNames = columnNames;
    }

    @Override
    public int getRowCount() {
        return rows.size();
    }

    @Override
    public int getColumnCount() {
        return columnNames.size();
    }

    @Override
    public String getColumnName(int column) {
        return columnNames.get(column);
    }

    @Override
    public Class<?> getColumnClass(int columnIndex) {
        Class type = String.class;
        return type;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        List<String> rowData = rows.get(rowIndex);
        return rowData.get(columnIndex);
    }
}

这需要一个 List 作为列名，一个 List<List> 作为行数据。

就个人而言，我更喜欢将数据包装到某种普通的旧 Java 对象 (POJO) 中，因为它封装了数据并在显示数据时提供了更大的灵活性（即，我需要显示所有对象的属性，如果我不想）

查看 How to Use Tables 了解更多详情

如何将 ArrayList 添加到 jtable？

How can I add an ArrayList to a jtable?

java

swing

web-services

glassfish

arraylist