带有比较器的JTable在排序后访问了错误的行数据;删除getModel（）修复它。为什么？
为我的JTable引入排序非常容易：
//Existing code
dftTableModel = new DefaultTableModel(0 , 4);
tblOutput = new JTable(dftTableModel);
//Added code
RowSorter<TableModel> sorter = new TableRowSorter<TableModel>(dftTableModel);
tblOutput.setRowSorter(sorter);
但是由于我将Size列格式化为逗号文本，因此没有排序：
我从未使用Comparator，但找到了我修改过的示例。
public class RowSorterWithComparator
{
static Comparator compareNumericStringsWithCommas;
static TableRowSorter sorter;
static JTable tblOutput;
static JScrollPane pane;
static JFrame frame;
static DefaultTableModel dftTableModel;
// static TableColumnAdjuster tca ;
static DefaultTableCellRenderer rightRenderer;
static JButton btnOpen;
static String[] columnNames = { "Date", "Size" };
static Object rows[][] =
{
{"7/27/2015","96","mavenVersion.xml","C:\\Users\\Dov\\.AndroidStudio1.2\\config\\options\\"},
{"7/27/2015","120","keymap.xml","C:\\Users\\Dov\\.AndroidStudio1.2\\config\\options\\"},
{"7/27/2015","108","Default.xml","C:\\Users\\Dov\\.AndroidStudio1.2\\config\\inspection\\"},
{"4/27/2015","392","key pay.txt","C:\\Users\\Dov\\A\\"},
{"6/13/2015","161","BuildConfig.java","C:\\Users\\Dov\\androidfp2_examples\\eclipse_projects\\FlagQuiz\\gen\\com\\deitel\\flagquiz\\"}
};
public static void main(String args[])
{
compareNumericStringsWithCommas = (Comparator) new Comparator()
{
@Override public int compare(Object oo1, Object oo2)
{
String o1 = oo1.toString().replace(",", "");
String o2 = oo2.toString().replace(",", "");
return Integer.valueOf(o1).compareTo(Integer.valueOf(o2));
}
};
dftTableModel = new DefaultTableModel(0 , columnNames.length);
tblOutput = new JTable(dftTableModel);
dftTableModel.setColumnIdentifiers(new Object[]{"Date", "Size", "File name", "Path to file"});
rightRenderer = new DefaultTableCellRenderer();
rightRenderer.setHorizontalAlignment(SwingConstants.RIGHT);
tblOutput.getColumnModel().getColumn(1).setCellRenderer(rightRenderer);
sorter = new TableRowSorter<>(dftTableModel);
sorter.setModel(tblOutput.getModel());
sorter.setComparator(1,compareNumericStringsWithCommas);
tblOutput.setRowSorter(sorter);
tblOutput.setAutoResizeMode(AUTO_RESIZE_OFF);
// tca = new tablecolumnadjuster.TableColumnAdjuster(tblOutput);
// tca.setDynamicAdjustment(true);
tblOutput.setFont(new Font("Courier New",Font.PLAIN,12));
pane = new JScrollPane(tblOutput);
for (int i = 0; i < 5; i++)
dftTableModel.addRow(rows[i]);
btnOpen = new JButton("Open selected file");
btnOpen.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e)
{
int row = tblOutput.getSelectedRow();
String entry = (String)tblOutput.getModel().getValueAt(row, 3)
+ "\\" + (String)tblOutput.getModel().getValueAt(row, 2);
try
{
Desktop.getDesktop().open(new File((entry.trim())));
} catch (IOException ex) {System.out.println("Can't open file"); }
}
});
frame = new JFrame("Sort Table Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(pane, BorderLayout.CENTER);
frame.add(btnOpen, BorderLayout.AFTER_LAST_LINE);
frame.setSize(800, 350);
frame.setVisible(true);
}
}
效果很好。
很容易对尺寸列进行右对齐：
rightRenderer = new DefaultTableCellRenderer();
rightRenderer.setHorizontalAlignment(SwingConstants.RIGHT);
我添加了一个按钮来打开所选文件。但排序后，错误的文件打开了。
所以我从鼠标监听器中的语句中删除了getModel：
String entry = (String)tblOutput.getValueAt(row, 3)
+ "\\" + (String)tblOutput.getValueAt(row, 2);
我不知道为什么它一直存在，因为我偷了所有的东西 来自不同地方的各种代码。
无论如何，现在一切正常。
但我有疑问：
（1）在获取表格行的值的上下文中何时需要getModel？
我认为dftTableModel tblOutput用于getModel肯定是正确的。
（2）TableRowSorter返回的行是数据最初所在的行吗？
如果是这样，我想这有时会很有用。不知道什么时候......要“取消排序”？
（3）我使用getModel的原因是dftTableModel没有得到的原因
正确的数据？ （即，两者是不兼容的吗？）
（4）tblOutput.getModel()是否等同于import java.awt.BorderLayout;
import java.awt.Desktop;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
import java.util.Comparator;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import static javax.swing.JTable.AUTO_RESIZE_OFF;
import javax.swing.SwingConstants;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableRowSorter;
//import tablecolumnadjuster.TableColumnAdjuster;
？
...............................
程序的导入：
OleDbConnection accCon = new OleDbConnection();
OdbcCommand mySQLCon = new OdbcCommand();
try
{
//connect to mysql
Connect();
mySQLCon.Connection = connection;
//connect to access
accCon.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;" +
@"Data source= " + pathToAccess;
accCon.Open();
var cnt = 0;
while (cnt < 5)
{
if (accCon.State == ConnectionState.Open)
break;
cnt++;
System.Threading.Thread.Sleep(50);
}
if (cnt == 5)
{
ToolBox.logThis("Connection to Access DB did not open. Exit Process");
return;
}
}
catch (Exception e)
{
ToolBox.logThis("Faild to Open connections. msg -> " + e.Message + "\\n" + e.StackTrace);
}
//AMK: transaction starts here
var transaction = accCon.BeginTransaction();
OleDbCommand accCmn = new OleDbCommand();
accCmn.Connection = accCon;
accCmn.Transaction = transaction;
//access insert query structure
var insertAccessQuery = "INSERT INTO {0} values({1});";
// key = > tbl name in access, value = > mysql query to b executed
foreach (var table in tblNQuery)
{
try
{
mySQLCon.CommandText = table.Value;
//executed mysql query
using (var dataReader = mySQLCon.ExecuteReader())
{
//variable to hold row data
var rowData = new object[dataReader.FieldCount];
var parameters = "";
//read the result set from mysql query
while (dataReader.Read())
{
//fill rowData with the row values
dataReader.GetValues(rowData);
//build the parameters for insert query
for (var i = 0; i < dataReader.FieldCount; i++)
parameters += "'" + rowData[i] + "',";
parameters = parameters.TrimEnd(',');
//insert to access
accCmn.CommandText = string.Format(insertAccessQuery, table.Key, parameters);
try
{
accCmn.ExecuteNonQuery();
}
catch (Exception exc)
{
ToolBox.logThis("Faild to insert to access db. msg -> " + exc.Message +
"\\n\\tInsert query -> " + accCmn.CommandText);
}
parameters = "";
}
}
//AMK: transaction commits here if every thing is going well
transaction.Commit();
}
catch (Exception e)
{
ToolBox.logThis("Faild to populate access db. msg -> " + e.Message + "\\n" + e.StackTrace);
//AMK: transaction rollback here if there is a problem
transaction.Rollback();
}
}
Disconnect();
accCmn.Dispose();
accCon.Close();
2 个答案:
答案 0 :(得分：3)
所以我从鼠标监听器中的语句中删除了getModel：
table.getValueAt(row, column);
中的数据未排序。 View（JTable）以排序顺序显示数据
您可以使用以下方式从视图中获取数据：
int modelRow = table.convertRpwIndexToModel(row);
table.getModel().getValueAt(modelRow, column);
如果您想从您使用的TableModel获取数据：
JTable还有来回转换列索引的方法。
因此，您始终需要知道您是否尝试按TableModel上显示的方式或其加载到String entry = (String)tblOutput.getValueAt(row, 3) ...
的方式访问数据，然后使用适当的索引（或可能）不涉及索引转换。
getValueAt(...)当您对值进行硬编码时，您需要知道硬编码值代表什么。在这种情况下，您将从表中访问动态行值，并从模型中访问列。
所以在上面的陈述中你需要转换＆＃34; 3＆＃34;从模型到视图，因为您正在使用表的int viewColumn3 = table.convertColumnIndexToView(3);
String entry = (String)tblOutput.getValueAt(row, viewColumn3)
方法。
String entry = (String)tblOutput.getModel().getValueAt(modelRow, 3) ...
或者，由于您多次引用硬编码值（即第2列和第3列），因此保留硬编码列索引并仅转换行索引一次然后从TableModel访问数据可能更容易：
protected IActorRef concertRouter;
public User(IActorRef concertRouter, int eventId)
{
this.concertRouter = concertRouter;
this.eventId = eventId;
JobStarter = Context.System.Scheduler.ScheduleTellRepeatedlyCancelable(TimeSpan.FromMilliseconds(20),
TimeSpan.FromMilliseconds(1000), Self, new AttemptToStartJob(), Self);
Receive<AttemptToStartJob>(start =>
{
var self = Self;
concertRouter.Ask<Routees>(new GetRoutees()).ContinueWith(tr =>
{
if (tr.Result.Members.Count() > 0)
{
var m = new GetAvailableSeats() { User = self, ConcertId = eventId };
self.Tell(m);
// JobStarter.Cancel();
}
}, TaskContinuationOptions.ExecuteSynchronously);
});
Receive<GetAvailableSeats>(rs =>
{
rs.User = Self;
//get free seats
concertRouter.Ask(rs).ContinueWith(t=>
{
Console.WriteLine("response received!!");
}
);
});
答案 1 :(得分：0)
这就是现在的SSCCE（见评论），但它是基于@camickr上下文评论中建议的原始代码的修订版。
此问题已修复目前，拖动列后，如果文件名或路径列位置发生更改，则单击按钮会导致错误，例如The file: xml\C:\Users\Dov\.AndroidStudio1.2\config\options doesn't exist.移动扩展列后发生此错误（其中在Filename列之前）到Path列之后。
import java.awt.BorderLayout;
import java.awt.Desktop;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
import java.util.Comparator;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import static javax.swing.JTable.AUTO_RESIZE_OFF;
import javax.swing.SwingConstants;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableRowSorter;
//import tablecolumnadjuster.TableColumnAdjuster;
public class RowSorterWithComparator
{
static final int DATE_COLUMN = 0;
static final int SIZE_COLUMN = 1;
static final int EXTENSION_COLUMN= 2;
static final int FILENAME_COLUMN = 3;
static final int PATH_COLUMN = 4;
public static void main(String args[])
{
Comparator compareNumericStringsWithCommas;
TableRowSorter sorter;
JTable tblOutput;
JScrollPane pane;
JFrame frame;
DefaultTableModel dftTableModel;
// TableColumnAdjuster tca ;
DefaultTableCellRenderer rightRenderer;
JButton btnOpen;
Object[] columnNames = new Object[]{"Date", "Size", "Extension", "File name", "Path to file"};
Object rows[][] =
{
{"7/27/2015","9,600","xml","mavenVersion.xml","C:/Users/Dov/.AndroidStudio1.2/config/options/"},
{"7/27/2015","120,000","xml","keymap.xml","C:/Users/Dov/.AndroidStudio1.2/config/options/"},
{"7/27/2015","108","xml","Default.xml","C:/Users/Dov/.AndroidStudio1.2/config/inspection/"},
{"4/27/2015","39,200","txt","key pay.txt","C:/Users/Dov/A/"},
{"6/13/2015","91","java","BuildConfig.java","C:/Users/Dov/androidfp2_examples/eclipse_projects/FlagQuiz/gen/com/deitel/flagquiz/"}
};
compareNumericStringsWithCommas = (Comparator) new Comparator()
{
@Override public int compare(Object oo1, Object oo2)
{
String o1 = oo1.toString().replace(",", "");
String o2 = oo2.toString().replace(",", "");
return Integer.valueOf(o1).compareTo(Integer.valueOf(o2));
}
};
dftTableModel = new DefaultTableModel(0 , columnNames.length);
tblOutput = new JTable(dftTableModel);
dftTableModel.setColumnIdentifiers(columnNames);
rightRenderer = new DefaultTableCellRenderer();
rightRenderer.setHorizontalAlignment(SwingConstants.RIGHT);
tblOutput.getColumnModel().getColumn(1).setCellRenderer(rightRenderer);
sorter = new TableRowSorter<>(dftTableModel);
sorter.setModel(tblOutput.getModel());
sorter.setComparator(1,compareNumericStringsWithCommas);
tblOutput.setRowSorter(sorter);
tblOutput.setAutoResizeMode(AUTO_RESIZE_OFF);
// tca = new tablecolumnadjuster.TableColumnAdjuster(tblOutput);
// tca.setDynamicAdjustment(true);
tblOutput.setFont(new Font("Courier New",Font.PLAIN,12));
pane = new JScrollPane(tblOutput);
for (Object[] row : rows)
dftTableModel.addRow(row);
btnOpen = new JButton("Open selected file");
btnOpen.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e)
{
int viewFilenameCol = tblOutput.convertColumnIndexToView(FILENAME_COLUMN);
int viewPathCol = tblOutput.convertColumnIndexToView(PATH_COLUMN);
int row = tblOutput.getSelectedRow();
String entry = (String)tblOutput.getValueAt(row, viewPathCol)
+ (String)tblOutput.getValueAt(row, viewFilenameCol);
try
{
Desktop.getDesktop().open(new File((entry.trim())));
}
catch
(
Exception ex) {System.out.println("Can't open file <" + entry + ">");
}
}
});
frame = new JFrame("Sort Table Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(pane, BorderLayout.CENTER);
frame.add(btnOpen, BorderLayout.SOUTH);
frame.setSize(800, 350);
frame.setVisible(true);
}
}
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