我努力为这张票找到一个更好的头衔，但那是我能想到的最好的。
我遇到了JTable内部的JComboBox问题。该程序是原始版本的缩小版本。它从数据库中提取数据并将该信息放入组合框中。从数据库中提取数据时，它将覆盖该字段。当从变量输入数据时，问题不存在。我想也许数据库的延迟很小就是问题，所以我加了一些延迟。我一路走到20秒，但仍然没有得到相同的结果。有一个名为DB的变量。将其设置为true，它将从db中提取数据，false将使用局部变量。
如果数据库为true，请转到最后一条记录并单击其中，然后在上述字段中单击一次。他们都是2但现在他们是1.做同样的事情，但将最后一个字段设置为100并按照上述步骤操作。然后所有记录都是100.这不是预期的行为。除非用户更改值，否则该字段应保持不变。如果DB为false，它将按预期运行。我已经尝试过各种各样的东西来隔离这个问题。原始数据来自db的事实应该无关紧要，它只是一个字符串。我认为还有另一个问题与同一个问题有关。如果字段为空白，则组合将覆盖已清除的字段，并且不允许再次清除该字段。
我准备了一个jar文件here，它包含所有源代码和db文件。我不确定是否有更好的方法来附加jar文件。您将需要从jar文件中提取代码，否则将无法正常工作。
以下是源代码：
import java.io.*;
import java.lang.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import javax.swing.table.*;
import java.util.ArrayList;
import java.util.Iterator;
public class ErrorDemo {
private String[][] comm = new String[3][6];
private int index = 0;
private JTable table;
private DefaultTableModel myData;
public String headers[] = new String[35];
private boolean DB = true;
// private boolean DB = false;
public ErrorDemo () {
Visual();
StartQuery();
}
public void Visual () {
final JFrame frame = new JFrame( "Automation" );
frame.setSize(800, 600);
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.setVisible( true );
myData = new DefaultTableModel();
table = new JTable( );
table.setModel( myData );
table.setFillsViewportHeight(true);
JScrollPane scroll1 = new JScrollPane(table);
scroll1.setVisible( true );
frame.add(scroll1);
frame.repaint();
frame.setVisible( true );
}
public void StartQuery () {
// set the data to be placed into the fields
index = 2;
headers[1] = "Feild 1";
headers[2] = "Feild 2";
comm[1][1] = "aaaaaaaaaaaaaaaa2";
comm[1][2] = "aaaaaaaaaaaaaaaa2";
comm[1][3] = "aaaaaaaaaaaaaaaa2";
comm[1][4] = "aaaaaaaaaaaaaaaa2";
comm[1][5] = "aaaaaaaaaaaaaaaa2";
comm[2][1] = "aaaaaaaaaaaaaaaa2";
comm[2][2] = "aaaaaaaaaaaaaaaa2";
comm[2][3] = "aaaaaaaaaaaaaaaa2";
comm[2][4] = "aaaaaaaaaaaaaaaa2";
comm[2][5] = "aaaaaaaaaaaaaaaa2";
//set the name of the headers
for ( int i = 1 ; i <= index ; i++ )
myData.addColumn( headers[i] );
//place the data into the table
Vector v = new Vector();
for ( int i = 1; i <= 5; i++ ) {
v = new Vector();
v.addElement( comm[1][i] );
v.addElement( comm[2][i] );
myData.addRow( v );
}
//place the data into the combo box then place the combo box into the table
TableColumn Column1 = table.getColumnModel().getColumn( 0 );
JComboBox comboBox = new JComboBox();
String[] output = new String[61];
// if DB is true it pulls the data from the the database else it will use a static string.
if ( DB ) {
String comm1 = "SELECT data FROM Table1 ORDER BY data; ";
// change the following path to where ever to put it.
DBDemo dbl1 = new DBDemo( "U:/Users/Goff/java/rcc automation/GreatBeyond/db1.accdb" );
dbl1.GetQuery( comm1, 1, comboBox );
} else {
// gofflib STL = new gofflib();
// STL.sleeper( 20000 ); //a test to see if adding delay would produce the issue, it did not.
output = new String [] { "", "aaaaaaaaaaaaaaaa1", "aaaaaaaaaaaaaaaa2", "aaaaaaaaaaaaaaaa3", "aaaaaaaaaaaaaaaa4", "aaaaaaaaaaaaaaaa5", "aaaaaaaaaaaaaaaa6", "aaaaaaaaaaaaaaaa7", "aaaaaaaaaaaaaaaa8", "aaaaaaaaaaaaaaaa9", "aaaaaaaaaaaaaaaa10", "aaaaaaaaaaaaaaaa11", "aaaaaaaaaaaaaaaa12", "aaaaaaaaaaaaaaaa13", "aaaaaaaaaaaaaaaa14", "aaaaaaaaaaaaaaaa15", "aaaaaaaaaaaaaaaa16", "aaaaaaaaaaaaaaaa17", "aaaaaaaaaaaaaaaa18", "aaaaaaaaaaaaaaaa19", "aaaaaaaaaaaaaaaa20", "aaaaaaaaaaaaaaaa21", "aaaaaaaaaaaaaaaa22", "aaaaaaaaaaaaaaaa23", "aaaaaaaaaaaaaaaa24", "aaaaaaaaaaaaaaaa25", "aaaaaaaaaaaaaaaa26", "aaaaaaaaaaaaaaaa27", "aaaaaaaaaaaaaaaa28", "aaaaaaaaaaaaaaaa29", "aaaaaaaaaaaaaaaa30", "aaaaaaaaaaaaaaaa31", "aaaaaaaaaaaaaaaa32", "aaaaaaaaaaaaaaaa33", "aaaaaaaaaaaaaaaa34", "aaaaaaaaaaaaaaaa35", "aaaaaaaaaaaaaaaa36", "aaaaaaaaaaaaaaaa37", "aaaaaaaaaaaaaaaa38", "aaaaaaaaaaaaaaaa39", "aaaaaaaaaaaaaaaa40", "aaaaaaaaaaaaaaaa41", "aaaaaaaaaaaaaaaa42", "aaaaaaaaaaaaaaaa43", "aaaaaaaaaaaaaaaa44", "aaaaaaaaaaaaaaaa45", "aaaaaaaaaaaaaaaa46", "aaaaaaaaaaaaaaaa47", "aaaaaaaaaaaaaaaa48", "aaaaaaaaaaaaaaaa49", "aaaaaaaaaaaaaaaa50", "aaaaaaaaaaaaaaaa51", "aaaaaaaaaaaaaaaa52", "aaaaaaaaaaaaaaaa53", "aaaaaaaaaaaaaaaa54", "aaaaaaaaaaaaaaaa55", "aaaaaaaaaaaaaaaa56", "aaaaaaaaaaaaaaaa57", "aaaaaaaaaaaaaaaa58", "aaaaaaaaaaaaaaaa59", "aaaaaaaaaaaaaaaa60", "aaaaaaaaaaaaaaaa61", "aaaaaaaaaaaaaaaa62", "aaaaaaaaaaaaaaaa63", "aaaaaaaaaaaaaaaa64", "aaaaaaaaaaaaaaaa65", "aaaaaaaaaaaaaaaa66", "aaaaaaaaaaaaaaaa67", "aaaaaaaaaaaaaaaa68", "aaaaaaaaaaaaaaaa69", "aaaaaaaaaaaaaaaa70", "aaaaaaaaaaaaaaaa71", "aaaaaaaaaaaaaaaa72", "aaaaaaaaaaaaaaaa73", "aaaaaaaaaaaaaaaa74", "aaaaaaaaaaaaaaaa75", "aaaaaaaaaaaaaaaa76", "aaaaaaaaaaaaaaaa77", "aaaaaaaaaaaaaaaa78", "aaaaaaaaaaaaaaaa79", "aaaaaaaaaaaaaaaa80", "aaaaaaaaaaaaaaaa81", "aaaaaaaaaaaaaaaa82", "aaaaaaaaaaaaaaaa83", "aaaaaaaaaaaaaaaa84", "aaaaaaaaaaaaaaaa85", "aaaaaaaaaaaaaaaa86", "aaaaaaaaaaaaaaaa87", "aaaaaaaaaaaaaaaa88", "aaaaaaaaaaaaaaaa89", "aaaaaaaaaaaaaaaa90", "aaaaaaaaaaaaaaaa91", "aaaaaaaaaaaaaaaa92", "aaaaaaaaaaaaaaaa93", "aaaaaaaaaaaaaaaa94", "aaaaaaaaaaaaaaaa95", "aaaaaaaaaaaaaaaa96", "aaaaaaaaaaaaaaaa97", "aaaaaaaaaaaaaaaa98", "aaaaaaaaaaaaaaaa99", "aaaaaaaaaaaaaaaa100" };
for ( int i = 1; i <= 100; i++ ) {
comboBox.addItem( output[i] );
}
}
Column1.setCellEditor(new DefaultCellEditor(comboBox));
table.repaint();
table.revalidate();
}
public static void main(String[] args) {
new ErrorDemo();
}
}
这是DBDemo
import java.sql.*;
import net.ucanaccess.jdbc.JackcessOpenerInterface;
import com.healthmarketscience.jackcess.Database;
import com.healthmarketscience.jackcess.DatabaseBuilder;
import net.ucanaccess.converters.TypesMap.AccessType;
import net.ucanaccess.ext.FunctionType;
import net.ucanaccess.jdbc.UcanaccessConnection;
import net.ucanaccess.jdbc.UcanaccessDriver;
import org.apache.commons.lang.builder.*;
import org.apache.commons.logging.*;
import org.hsqldb.jdbc.*;
import java.util.*;
import javax.swing.table.*;
import javax.swing.*;
public class DBDemo {
private Connection con;
private Statement st;
private ResultSet rs;
private String db;
private String comm = "";
private int index = 0;
private String Path = "";
public DBDemo ( String arg1 ) {
Path = arg1;
}
public void GetQuery ( String comm, int index, JComboBox comb ) {
try {
String output = "";
String path = new java.io.File(Path).getAbsolutePath();
db = "jdbc:ucanaccess://" + path;
Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
con = DriverManager.getConnection(db);
st = con.createStatement();
output = "";
rs = st.executeQuery( comm );
while (rs.next()) {
for ( int i = 1; i <= index; i++ ) {
Object o = rs.getObject(i);
String t;
t = ( o == null ? "" : o.toString() );
output += t + " ";
}
comb.addItem( output );
output = "";
}
rs.close();
st.close();
con.close();
} catch( NullPointerException | SQLException | ClassNotFoundException ex ){
ex.printStackTrace();
}
}
}
我试图让代码尽可能简洁。
如果DB = true或DB = false，则将相同的数据处理为字符串，然后将其放入组合框中。这怎么会引起不同的行为？
更新：这是使用自定义单元格渲染器的新代码。
import java.io.*;
import java.lang.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import javax.swing.table.*;
import java.util.ArrayList;
import java.util.Iterator;
public class ErrorDemo {
private String[][] comm = new String[3][6];
private int index = 0;
private JTable table;
private DefaultTableModel myData;
public String headers[] = new String[35];
private boolean DB = true;
// private boolean DB = false;
public ErrorDemo () {
Visual();
StartQuery();
}
public void Visual () {
final JFrame frame = new JFrame( "Automation" );
frame.setSize(800, 600);
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.setVisible( true );
myData = new DefaultTableModel();
table = new JTable( );
table.setModel( myData );
table.setFillsViewportHeight(true);
JScrollPane scroll1 = new JScrollPane(table);
scroll1.setVisible( true );
frame.add(scroll1);
frame.repaint();
frame.setVisible( true );
}
public void StartQuery () {
// set the data to be placed into the fields
index = 2;
headers[1] = "Feild 1";
headers[2] = "Feild 2";
comm[1][1] = "aaaaaaaaaaaaaaaa2";
comm[1][2] = "aaaaaaaaaaaaaaaa2";
comm[1][3] = "aaaaaaaaaaaaaaaa2";
comm[1][4] = "aaaaaaaaaaaaaaaa2";
comm[1][5] = "aaaaaaaaaaaaaaaa2";
comm[2][1] = "aaaaaaaaaaaaaaaa2";
comm[2][2] = "aaaaaaaaaaaaaaaa2";
comm[2][3] = "aaaaaaaaaaaaaaaa2";
comm[2][4] = "aaaaaaaaaaaaaaaa2";
comm[2][5] = "aaaaaaaaaaaaaaaa2";
//set the name of the headers
for ( int i = 1 ; i <= index ; i++ )
myData.addColumn( headers[i] );
//place the data into the table
Vector v = new Vector();
for ( int i = 1; i <= 5; i++ ) {
v = new Vector();
v.addElement( comm[1][i] );
v.addElement( comm[2][i] );
myData.addRow( v );
}
//place the data into the combo box then place the combo box into the table
TableColumn Column1 = table.getColumnModel().getColumn( 0 );
// JComboBox comboBox = new JComboBox();
MyComboBoxRenderer comboBox = new MyComboBoxRenderer();
String[] output = new String[61];
// if DB is true it pulls the data from the the database else it will use a static string.
if ( DB ) {
String comm1 = "SELECT data FROM Table1 ORDER BY data; ";
// change the following path to where ever to put it.
DBDemo dbl1 = new DBDemo( "U:/Users/Goff/java/rcc automation/GreatBeyond/db1.accdb" );
dbl1.GetQuery( comm1, 1, comboBox );
} else {
gofflib STL = new gofflib();
// STL.sleeper( 20000 ); //a test to see if adding delay would produce the issue, it did not.
output = new String [] { "", "aaaaaaaaaaaaaaaa1", "aaaaaaaaaaaaaaaa2", "aaaaaaaaaaaaaaaa3", "aaaaaaaaaaaaaaaa4", "aaaaaaaaaaaaaaaa5", "aaaaaaaaaaaaaaaa6", "aaaaaaaaaaaaaaaa7", "aaaaaaaaaaaaaaaa8", "aaaaaaaaaaaaaaaa9", "aaaaaaaaaaaaaaaa10", "aaaaaaaaaaaaaaaa11", "aaaaaaaaaaaaaaaa12", "aaaaaaaaaaaaaaaa13", "aaaaaaaaaaaaaaaa14", "aaaaaaaaaaaaaaaa15", "aaaaaaaaaaaaaaaa16", "aaaaaaaaaaaaaaaa17", "aaaaaaaaaaaaaaaa18", "aaaaaaaaaaaaaaaa19", "aaaaaaaaaaaaaaaa20", "aaaaaaaaaaaaaaaa21", "aaaaaaaaaaaaaaaa22", "aaaaaaaaaaaaaaaa23", "aaaaaaaaaaaaaaaa24", "aaaaaaaaaaaaaaaa25", "aaaaaaaaaaaaaaaa26", "aaaaaaaaaaaaaaaa27", "aaaaaaaaaaaaaaaa28", "aaaaaaaaaaaaaaaa29", "aaaaaaaaaaaaaaaa30", "aaaaaaaaaaaaaaaa31", "aaaaaaaaaaaaaaaa32", "aaaaaaaaaaaaaaaa33", "aaaaaaaaaaaaaaaa34", "aaaaaaaaaaaaaaaa35", "aaaaaaaaaaaaaaaa36", "aaaaaaaaaaaaaaaa37", "aaaaaaaaaaaaaaaa38", "aaaaaaaaaaaaaaaa39", "aaaaaaaaaaaaaaaa40", "aaaaaaaaaaaaaaaa41", "aaaaaaaaaaaaaaaa42", "aaaaaaaaaaaaaaaa43", "aaaaaaaaaaaaaaaa44", "aaaaaaaaaaaaaaaa45", "aaaaaaaaaaaaaaaa46", "aaaaaaaaaaaaaaaa47", "aaaaaaaaaaaaaaaa48", "aaaaaaaaaaaaaaaa49", "aaaaaaaaaaaaaaaa50", "aaaaaaaaaaaaaaaa51", "aaaaaaaaaaaaaaaa52", "aaaaaaaaaaaaaaaa53", "aaaaaaaaaaaaaaaa54", "aaaaaaaaaaaaaaaa55", "aaaaaaaaaaaaaaaa56", "aaaaaaaaaaaaaaaa57", "aaaaaaaaaaaaaaaa58", "aaaaaaaaaaaaaaaa59", "aaaaaaaaaaaaaaaa60", "aaaaaaaaaaaaaaaa61", "aaaaaaaaaaaaaaaa62", "aaaaaaaaaaaaaaaa63", "aaaaaaaaaaaaaaaa64", "aaaaaaaaaaaaaaaa65", "aaaaaaaaaaaaaaaa66", "aaaaaaaaaaaaaaaa67", "aaaaaaaaaaaaaaaa68", "aaaaaaaaaaaaaaaa69", "aaaaaaaaaaaaaaaa70", "aaaaaaaaaaaaaaaa71", "aaaaaaaaaaaaaaaa72", "aaaaaaaaaaaaaaaa73", "aaaaaaaaaaaaaaaa74", "aaaaaaaaaaaaaaaa75", "aaaaaaaaaaaaaaaa76", "aaaaaaaaaaaaaaaa77", "aaaaaaaaaaaaaaaa78", "aaaaaaaaaaaaaaaa79", "aaaaaaaaaaaaaaaa80", "aaaaaaaaaaaaaaaa81", "aaaaaaaaaaaaaaaa82", "aaaaaaaaaaaaaaaa83", "aaaaaaaaaaaaaaaa84", "aaaaaaaaaaaaaaaa85", "aaaaaaaaaaaaaaaa86", "aaaaaaaaaaaaaaaa87", "aaaaaaaaaaaaaaaa88", "aaaaaaaaaaaaaaaa89", "aaaaaaaaaaaaaaaa90", "aaaaaaaaaaaaaaaa91", "aaaaaaaaaaaaaaaa92", "aaaaaaaaaaaaaaaa93", "aaaaaaaaaaaaaaaa94", "aaaaaaaaaaaaaaaa95", "aaaaaaaaaaaaaaaa96", "aaaaaaaaaaaaaaaa97", "aaaaaaaaaaaaaaaa98", "aaaaaaaaaaaaaaaa99", "aaaaaaaaaaaaaaaa100" };
for ( int i = 1; i <= 100; i++ ) {
comboBox.addItem( output[i] );
}
}
// Column1.setCellEditor(new DefaultCellEditor(comboBox));
Column1.setCellEditor( new MyComboBoxEditor(comboBox) );
// Column1.setCellRenderer(new DefaultTableCellRenderer());
Column1.setCellRenderer( comboBox );
table.repaint();
table.revalidate();
}
public static void main(String[] args) {
new ErrorDemo();
}
}
class MyComboBoxRenderer extends JComboBox implements TableCellRenderer {
// public MyComboBoxRenderer(String[] items) {
public MyComboBoxRenderer() {
// super(items);
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (isSelected) {
setForeground(table.getSelectionForeground());
super.setBackground(table.getSelectionBackground());
} else {
setForeground(table.getForeground());
setBackground(table.getBackground());
}
setSelectedItem(value);
return this;
}
}
class MyComboBoxEditor extends DefaultCellEditor {
// public MyComboBoxEditor(String[] items) {
public MyComboBoxEditor( JComboBox items ) {
// public MyComboBoxEditor( MyComboBoxRenderer items ) {
// super(new JComboBox(items));
super( items );
}
}
使用新代码并且DB = true，该字段在完成加载时被覆盖。我可以看到它开始于＆＃34; aaaaaaaaaaaaaaaa2＆＃34;然后当出现下拉按钮时，它变为＆＃34; aaaaaaaaaaaaaaaa1＆＃34;。如果我更改一个值，然后单击另一个框和另一个框，那么这些框现在与第一个框相同。
使用新代码并且DB = false，initail值保持不变，但是当我更改一个字段并单击另一个字段时，它将被覆盖。
答案 0 :(得分：0)
试着看看这个例子：
import java.awt.Component;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
public class Main {
public static void main(String[] argv) throws Exception {
JTable table = new JTable();
DefaultTableModel model = (DefaultTableModel) table.getModel();
model.addColumn("A", new Object[] { "item1" });
model.addColumn("B", new Object[] { "item2" });
String[] values = new String[] { "1", "2", "3" };
TableColumn col = table.getColumnModel().getColumn(0);
col.setCellEditor(new MyComboBoxEditor(values));
col.setCellRenderer(new MyComboBoxRenderer(values));
}
}
class MyComboBoxRenderer extends JComboBox implements TableCellRenderer {
public MyComboBoxRenderer(String[] items) {
super(items);
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, int column) {
if (isSelected) {
setForeground(table.getSelectionForeground());
super.setBackground(table.getSelectionBackground());
} else {
setForeground(table.getForeground());
setBackground(table.getBackground());
}
setSelectedItem(value);
return this;
}
}
class MyComboBoxEditor extends DefaultCellEditor {
public MyComboBoxEditor(String[] items) {
super(new JComboBox(items));
}
}
你真正需要的是使用TableCellRenderer，因为它使用了JTable中的JComboBox。