如何在JTable行中设置自定义对象

Question

首先，我要说的不是关于渲染表格单元。

这是我基于User数据库中的对象使用2D数组构建的TableModel 。

    List<User> userList = userManagerService.getAllUsers();

    /* String[] col_user = {"Username", "Name", "Phone", .... } */
    String[][] data = new String[userList.size()][col_user.length];
    int i = 0;
    for (User user : userList) {
        String[] userdata = new String[col_user.length];
        userdata[0] = user.getUserUsername();
        userdata[1] = user.getUserName();
        userdata[2] = user.getUserPhone();
        userdata[3] = user.getUserNic();
        userdata[4] = user.getUserAddress();
        userdata[5] = user.getUserEmail();

        data[i++] = userdata;
    }

    VstTableItemModel tiModel = new VstTableItemModel(data, col_user);
    dataTable.setModel(tiModel);

我的问题是如何User使用表中的选定行取回对象。请注意，我无法创建新User对象并用行数据填充它。我必须获取查询的User对象（中的对象userList）。那么，他们用表行设置Object的任何方法吗？

这是我的VstTableItemModel课。

public class VstTableItemModel extends AbstractTableModel {

    ArrayList<Object[]> data;
    String[] header;

    public VstTableItemModel(Object[][] obj, String[] header) {
        this.header = header;
        data = new ArrayList<Object[]>();

        for (int i = 0; i < obj.length; ++i) {
            data.add(obj[i]);
        }
    }

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

    @Override
    public int getColumnCount() {
        return header.length;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        return data.get(rowIndex)[columnIndex];
    }

    @Override
    public String getColumnName(int index) {
        return header[index];
    }

}

Answer 1

无需User在创建模型之前拆分对象，而是将其直接添加到模型中并允许模型为您完成工作…

例如

public class VstTableItemModel extends AbstractTableModel {

    private List<User> users;

    public VstTableItemModel(List<User> users) {

        this.users = new ArrayList<User>(users);

    }

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

    @Override
    public int getColumnCount() {
        return 6;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {

        Object value = "??";
        User user = users.get(rowIndex);
        switch (columnIndex) {
            case 0:
                value = user.getUserUsername();
                break;
            case 1:
                value = user.getUserName();
                break;
            case 2:
                value = user.getUserPhone();
                break;
            case 3:
                value = user.getUserNic();
                break;
            case 4:
                value = user.getUserAddress();
                break;
            case 5:
                value = user.getUserEmail();
                break;
        }

        return value;

    }

    @Override
    public Class<?> getColumnClass(int columnIndex) {
        return // Return the class that best represents the column...
    }

    /* Override this if you want the values to be editable...
    @Override
    public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
        //....
    }
    */

    /**
     * This will return the user at the specified row...
     * @param row
     * @return 
     */
    public User getUserAt(int row) {
        return users.get(row);
    }

}

这样，您应该能够执行类似…

List<User> userList = userManagerService.getAllUsers();
VstTableItemModel tiModel = new VstTableItemModel(userList);

现在，当您需要…时，您可以抓住在特定行中代表的用户…

User user = tiModel.getUserAt(rowIndex);