TableView (javaFX) 只显示空行

Question

我的 TableView 显示空白行，我错过了什么？

项目link -> https://github.com/raphaelbgr/SwingSocketClient/tree/database

我正在尝试从数据库中收集信息并将其显示在此列表视图中，jdbc 连接完美且有效，但 tableView 未显示项目，我已阅读 3 次oracle 教程，但运气不好。

public ObservableList<MessageDataTableModel> queryChatHistory(int rowLimit) throws SQLException {
    final ObservableList<MessageDataTableModel> data = FXCollections.observableArrayList();
    String query = "SELECT SERV_REC_TIMESTAMP, OWNERNAME, TEXT FROM MESSAGELOG LIMIT " + rowLimit;

    Statement st = c.createStatement();
    ResultSet rs = st.executeQuery(query);
    while(rs.next()) {
        while(rs.next()) {
            data.add(new MessageDataTableModel(rs.getString(1),rs.getString(2),rs.getString(3)));
        }
    }
    return data;
}

这调用了上面的方法：

public void populateHistoryTable(int rowLimit) {
    DAO dao = new DAO();
    try {
        dao.connect();
        table_chathistory.setItems(dao.queryChatHistory(rowLimit));
        dao.disconnect();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

这是使用的数据模型，不知道我在上面遗漏了什么：

private SimpleStringProperty timestamp = new SimpleStringProperty();
private SimpleStringProperty screenname = new SimpleStringProperty();
private SimpleStringProperty message = new SimpleStringProperty();

public MessageDataTableModel() {

}

public MessageDataTableModel(String timestamp, String screenname, String message) {
    this.timestamp = new SimpleStringProperty(timestamp);
    this.screenname = new SimpleStringProperty(screenname);
    this.message = new SimpleStringProperty(message);
}
public void setTimestamp(String timestamp) {
    this.timestamp.set(timestamp);
}
public void setScreenname(String screenname) {
    this.screenname.set(screenname);
}
public void setMessage(String message) {
    this.message.set(message);
}
}

然后出现空白TableView，不知道我错过了什么

Answer 1

我刚发现，在 FXML 文件上我必须输入这个来关联要合并到 TableView 的数据

<TableView fx:id="table_chathistory" layoutX="7.0" layoutY="31.0" prefHeight="354.0" prefWidth="602.0"> <columns> <TableColumn prefWidth="75.0" text="Timestamp"><cellValueFactory><PropertyValueFactory property="timestamp" /></cellValueFactory></TableColumn>

<TableColumn prefWidth="85.0" text="Screen Name"><cellValueFactory><PropertyValueFactory property="screenname" /></cellValueFactory></TableColumn>

<TableColumn prefWidth="441.0" text="Message"><cellValueFactory><PropertyValueFactory property="message" /></cellValueFactory></TableColumn> </columns> `

并且必须对 dataModel 进行一些修改，以检索字符串值。

public class MessageDataTableModel {

private SimpleStringProperty timestamp = new SimpleStringProperty();
private SimpleStringProperty screenname = new SimpleStringProperty();
private SimpleStringProperty message = new SimpleStringProperty();

public MessageDataTableModel() {

}

public MessageDataTableModel(String timestamp, String screenname, String message) {
    this.timestamp = new SimpleStringProperty(timestamp);
    this.screenname = new SimpleStringProperty(screenname);
    this.message = new SimpleStringProperty(message);
}
public String getTimestamp() {
    return timestamp.getValue();
}
public void setTimestamp(String timestamp) {
    this.timestamp.set(timestamp);
}
public String getScreenname() {
    return screenname.getValue();
}
public void setScreenname(String screenname) {
    this.screenname.set(screenname);
}
public String getMessage() {
    return message.getValue();
}
public void setMessage(String message) {
    this.message.set(message);
}
}

我们开始吧，结果在这里：

Answer 2

您当前的tableView定义如下：

<TableView fx:id="table_chathistory" layoutX="7.0" layoutY="31.0" prefHeight="354.0" prefWidth="602.0">
    <columns>
        <TableColumn prefWidth="75.0" text="Timestamp" />
        <TableColumn prefWidth="85.0" text="Screen Name" />
        <TableColumn prefWidth="441.0" text="Message" />
    </columns>
</TableView>

此处，tableColumns 缺少 cellValueFactory。在 FXML 中，您可以将其定义为

<TableColumn prefWidth="75.0" text="Timestamp">
    <cellValueFactory>
        <PropertyValueFactory property="timestamp" />
    </cellValueFactory>
</TableColumn>

和数据模型 class 应该有访问器：

public class MessageDataTableModel
{

    private StringProperty timestampProperty = new SimpleStringProperty();

    public void setTimestamp( String timestamp ) {
        this.timestampProperty.set( timestamp );
    }

    public String getTimestamp() {
        return this.timestampProperty.get();
    }

    public StringProperty timestampProperty() {
        return this.timestampProperty;
    }
}

请注意，对于 getter 方法，returns ObservableValue（上面的 timestampProperty()）应该具有 propertyName + "Property"，其中 propertyName 是 "timestamp" 在 <PropertyValueFactory property="timestamp" />.

TableView (javaFX) 只显示空行

TableView (javaFX) is showing only blank lines

java

javafx

javafx-2

tableview