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JTable demo

时间:2022-12-25 22:00:25浏览次数:64  
标签:int demo new JTable swing import table javax

 

简单讲就是在没有使用layout manager的时候用setSize,在使用了layout manager 的时候用setPreferredSize
 
并且setPreferredSize通常和setMinimumSize、setMaximumSize联系起来使用
setSize()是你手动来设置组件的大小
Dimension 类封装单个对象中组件的宽度和高度(精确到整数)。该类与组件的某个属性关联。由 Component 类和 LayoutManager 接口定义的一些方法将返回 Dimension 对象
setPreferredSize设置此组件的首选大小
一般会用setPreferredSize 

 

// in constructor
rowSM_treatments = table_histories.getSelectionModel();
rowSM_treatments.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No rows are selected.");
} else {
selectedRow_treatments = lsm.getMinSelectionIndex();
System.out.println("selected Row> " + selectedRow_treatments);
//do more
}}});

 

​table.changeSelection(row,0,false,false);​

import javax.swing.JTable;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class SelectionListener implements ListSelectionListener {
JTable table;

SelectionListener(JTable table) {
this.table = table;
}

public void valueChanged(ListSelectionEvent e) {
if (e.getSource() == table.getColumnModel().getSelectionModel() && table.getColumnSelectionAllowed()) {
int firstRow = e.getFirstIndex();
int lastRow = e.getLastIndex();
// 事件处理...
}
}

}

 

​ int​

getFirstIndex()​

          Returns the index of the first row whose selection may have changed.

​ int​

getLastIndex()​

          Returns the index of the last row whose selection may have changed.

​ boolean​

getValueIsAdjusting()​

          Returns whether or not this is one in a series of multiple events, where changes are still being made.

​ String​

toString()​

          Returns a ​​String​​ that displays and identifies this object's properties.

  

package swing.table;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.util.Date;

import javax.swing.AbstractAction;
import javax.swing.DefaultListSelectionModel;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.KeyStroke;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class SelectionModeDemo {

String[] headings = { "Name", "Customer ID", "Order #", "Status" };

Object[][] data = {
{ "A", new Integer(3), "0", new Date() },
{ "B", new Integer(6), "4", new Date() },
{ "C", new Integer(9), "9", new Date() },
{ "D", new Integer(7), "1", new Date() },
{ "E", new Integer(4), "1", new Date() },
{ "F", new Integer(8), "2", new Date() },
{ "G", new Integer(6), "1", new Date() }
};

JTable jtabOrders = new JTable(data, headings);

SelectionModeDemo() {
final JFrame jfrm = new JFrame("JTable Demo");
jfrm.setLayout(new FlowLayout());
jfrm.setSize(800, 600);
jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JScrollPane jscrlp = new JScrollPane(jtabOrders);
jfrm.add(jscrlp);
jtabOrders.setPreferredScrollableViewportSize(new Dimension(420, 200));

// 设置选择模式。以下列表描述了接受的选择模式:只能选择一行!
jtabOrders.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

// 拦截Ctrl+A组合键,防止焦点丢失
// new event create.
KeyStroke ctrlA = KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK);
// overwrite super class's event.
jtabOrders.getInputMap().put(ctrlA, "DO_NOTHING");
jtabOrders.getActionMap().put("DO_NOTHING", new AbstractAction() {
private static final long serialVersionUID = 1L;

@Override
public void actionPerformed(ActionEvent e) {
System.out.println("Do nothing");
}
});

/**
* 在JTable里被选择的行发生变化时处理某事件的方法。 例如: 1:选择第一行的状态下,选择第二行时
* 2:只选择一行的状态下,追加选择另外的行时
*/
jtabOrders.getSelectionModel().addListSelectionListener(new ListSelectionListener() {

@Override
public void valueChanged(ListSelectionEvent e) {
DefaultListSelectionModel model = (DefaultListSelectionModel) e.getSource();

if (!e.getValueIsAdjusting()) {
/*
* public boolean getValueIsAdjusting()
* 一次鼠标的点击会有两次事件响应(按下和释放)。
* 前者的事件属性中getValueIsAdjusting()=true,后者是false。
* 因此,可以通过判断getValueIsAdjusting()来区别鼠标按下和释放。
*/
JOptionPane.showMessageDialog(jfrm, "Msg:" +
model.getSelectionMode() + " "
+ jtabOrders.getValueAt(jtabOrders.getSelectedRow(), 0).toString()
);
}

}
});

jfrm.setLocationRelativeTo(null);
jfrm.setVisible(true);

jtabOrders.setColumnSelectionAllowed(false);
jtabOrders.setRowSelectionAllowed(true);
}

public static void main(String args[]) {
new SelectionModeDemo();
}
}

 

 

​ http://melodyvictor.blog.163.com/blog/static/1180061572011417315978/​

 

//设置是否可以选择此模型中的列。
    jtabOrders.setColumnSelectionAllowed(false);
    //设置是否可以选择此模型中的行。
    jtabOrders.setRowSelectionAllowed(true);

    //设置此表是否允许同时存在行选择和列选择。

jtabOrders.setCellSelectionEnabled(true);

 

​static int​

MULTIPLE_INTERVAL_SELECTION

          selectionMode 属性的值:一次选择一个或多个连续的索引范围。

​static int​

SINGLE_INTERVAL_SELECTION

          selectionMode 属性的值:一次选择一个连续的索引范围。

​static int​

SINGLE_SELECTION

          selectionMode 属性的值:一次选择一个列表索引。


 

 

 

编写该JTable的TableModel的String getColumnName(int columnIndex)方法

//传进来的是列的索引值
//返回该列的列名/
/给JTable设置好TableModel后,这个方法由系统自动调用
//显示在JTable中
public String getColumnName(int columnIndex){
return "你想要设置的对应列的列名";
}
eg.:
public String getColumnName(int columnIndex){
if(columnIndex == 1)
return "索引值为 1 的列的名字";
if(columnIndex == 2)
return "索引值为 2 的列的名字";
...
}

看了一篇​​实现JTable的列宽与内容的自适应 ​​稍加修饰后如下:

public void FitTableColumns(JTable myTable){
JTableHeader header = myTable.getTableHeader();
int rowCount = myTable.getRowCount();

Enumeration columns = myTable.getColumnModel().getColumns();
while(columns.hasMoreElements()){
TableColumn column = (TableColumn)columns.nextElement();
int col = header.getColumnModel().getColumnIndex(column.getIdentifier());
int width = (int)myTable.getTableHeader().getDefaultRenderer()
.getTableCellRendererComponent(myTable, column.getIdentifier()
, false, false, -1, col).getPreferredSize().getWidth();
for(int row = 0; row<rowCount; row++){
int preferedWidth = (int)myTable.getCellRenderer(row, col).getTableCellRendererComponent(myTable,
myTable.getValueAt(row, col), false, false, row, col).getPreferredSize().getWidth();
width = Math.max(width, preferedWidth);
}
header.setResizingColumn(column); // 此行很重要
column.setWidth(width+myTable.getIntercellSpacing().width);
}
}

​http://www.blogjava.net/zeyuphoenix/archive/2010/04/08/317755.html​

 

 

 

package swing.table;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.table.TableColumnModel;

public class TestTable extends JFrame {
private static final long serialVersionUID = 1L;
JTable tb;
JPanel p = new JPanel();

public TestTable() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocation(112, 0);
setSize(700, 420);
final Object[] columnNames = { "档案号", "姓名", "年龄", "性别", "婚姻状况", "职业", "联系电话" };
Object[][] rowData = { { "010110", "张三", "28", "男", "已婚", "教师", "13686562936" },
{ "010110", "李四", "28", "男", "已婚", "教师", "13686562936" } };
tb = new JTable(rowData, columnNames) {
private static final long serialVersionUID = 1L;

// 添加部分1
public boolean isCellEditable(int row, int column) {
return false;
}
};
tb.setPreferredScrollableViewportSize(new Dimension(639, 232));
// tb.setEnabled(false);
tb.setRowHeight(20);
tb.setRowSelectionAllowed(true);
tb.setSelectionBackground(Color.lightGray);
tb.setSelectionForeground(Color.white);
tb.setGridColor(Color.black);
tb.setShowGrid(true);
tb.setShowHorizontalLines(true);
tb.setShowVerticalLines(true);
tb.setBackground(Color.white);
// 添加部分2
tb.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON1) {// 双击鼠标


if (e.getClickCount() == 2) {
int colummCount = tb.getModel().getColumnCount();
// 列数
for (int i = 0; i < colummCount; i++){
System.out.print(tb.getModel().getColumnName(i)+":");
System.out.print(tb.getModel().getValueAt(tb.getSelectedRow(), i).toString() + " ");
}
System.out.println();
}
}
}
});
JScrollPane pane = new JScrollPane(tb);
pane.setBackground(Color.white);
p.add(pane);
add(p);
setVisible(true);
}

public static void main(String[] args) {
new TestTable();
}
}

 
加载时选中多行:

ListSelectionModel listSelectionModel = new DefaultListSelectionModel();     
listSelectionModel .setSelectionInterval(0, 2);
table.setSelectionModel(ListSelectionModel);
listSelectionModel .removeSelectionInterval(1, 1);
ListSelectionModel listSelectionModel = new DefaultListSelectionModel();
listSelectionModel .setSelectionInterval(0, 2);
table.setSelectionModel(ListSelectionModel);
listSelectionModel .removeSelectionInterval(1, 1);

 

JTable中列的排序:

package swing.table.sort;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.math.BigDecimal;
import java.util.regex.Pattern;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.RowSorter;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;

public class TestSortedTable {
private static int flag = 0;

public static void main(String args[]) {
JFrame frame = new JFrame("JTable的排序测试");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final String columnNames[] = { "ID", "姓名", "国籍", "年龄", "体重" };
final Object sortRight_1st_withInt[][] = {
{ 1, "嘉靖", "中国", 44, 90.5 },
{ 3, "姚明", "中国", 25, 120.5 },
{ 2, "赵子龙", "西蜀", 1234, 130.6 },
{ 10, "曹操", "北魏", 2112, 90.0 },
{ 20, "Bill Gates", "美国", 45, 0.5 },
{ 5, "Tomas", "英国", 33, 100.0 }
};

final Object sortWrong_1st_withString[][] = {
{ "1", "嘉靖", "中国", 44, "90.5" },
{ "3", "姚明", "中国", 25, "120.5" },
{ "2", "赵子龙", "西蜀", 1234, "130.6" },
{ "10", "曹操", "北魏", 2112, "90.0" },
{ "20", "Bill Gates", "美国", 45, "0.5" },
{ "5", "Tomas", "英国", 33, "100.0" }
};

final Object[][] getRightSort_1st_withString = recoverData2Number(sortWrong_1st_withString);

final DefaultTableModel model = new CustomizedTableModel(null, null);

final JTable table = new JTable(model);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
// table.setAutoCreateRowSorter(true);
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);// 只能选一行
table.getTableHeader().setReorderingAllowed(false);
table.setRowSorter(new TableRowSorter<TableModel>(model));

JScrollPane pane = new JScrollPane(table);
frame.add(pane, BorderLayout.CENTER);

JButton changeSourceBtn = new JButton("Change Source");
changeSourceBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (flag % 3 == 0) {
model.setDataVector(sortRight_1st_withInt, columnNames);
} else if (flag % 3 == 1) {
model.setDataVector(sortWrong_1st_withString, columnNames);
} else if (flag % 3 == 2) {
model.setDataVector(getRightSort_1st_withString, columnNames);
}
flag++;
}
});

JButton clearBtn = new JButton("Clear");
clearBtn.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
try {
RowSorter<?> rowSort = table.getRowSorter();
if (rowSort != null) {
rowSort.setSortKeys(null);// 如果使用了排序器,先清除对表的排序
}
((DefaultTableModel) table.getModel()).getDataVector().clear();
((DefaultTableModel) table.getModel()).fireTableDataChanged();
table.updateUI();
} catch (Exception ex) {
System.out.println(ex);
}

}
});

JPanel southPanel = new JPanel();
southPanel.setLayout(new FlowLayout());
southPanel.add(changeSourceBtn);
southPanel.add(clearBtn);

frame.add(southPanel, BorderLayout.SOUTH);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600, 300);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}

private static Object[][] recoverData2Number(Object[][] sortWrong_1st_withString) {
Object[][] target = new Object[sortWrong_1st_withString.length][];
for (int i = 0; i < sortWrong_1st_withString.length; i++) {
Object[] sourceRecord = sortWrong_1st_withString[i];
Object[] targetRecord = new Object[sourceRecord.length];
for (int j = 0; j < sourceRecord.length; j++) {
Object item = sourceRecord[j];
if (isNumericInt(sourceRecord)) {
item = Integer.parseInt(item.toString());
} else if (isNumericDouble(item)) {
item = new BigDecimal(item.toString()).doubleValue();
}
targetRecord[j] = item;
}

target[i] = targetRecord;
}
return target;
}

private static boolean isNumericInt(Object valueAt) {
Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");
return pattern.matcher(valueAt.toString().trim()).matches();
}

private static boolean isNumericDouble(Object valueAt) {
Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*\\.?[\\d]*$");
return pattern.matcher(valueAt.toString().trim()).matches();
}

}

class CustomizedTableModel extends DefaultTableModel {
private static final long serialVersionUID = 1L;

public Class<?> getColumnClass(int column) {
if (getRowCount() == 0) {
return Object.class;
}
return getValueAt(0, column).getClass();
}

public CustomizedTableModel(Object[][] data, Object[] columnNames) {
super(data, columnNames);
}

}

排序有两个途径:
(1)为每列的值设置正确的类型,并且重写DefaultTableModel中的getColumnClass方法
因为Integer,Double实现了Comparator接口,即可正确排序
(2)table.setRowSorter(new TableRowSorter<TableModel>(model));
然后为每列指定特定的Comparator:

public class OrderNumberComparator implements Comparator{

public int compare(Object o1, Object o2) {
int i = (Integer) o1 - (Integer) o2;
return i;
}

}

定义表的时候,选择按自定义算法排序的字段,如果不设置,默认按字符串的ASCII码排序

JTable dataGrid=new JTable ();

DefaultTableModel model = (DefaultTableModel) this.dataGrid.getModel();
TableRowSorter<TableModel> sorter=new TableRowSorter<TableModel>(model);
//sorter.setSortable(0, false);
sorter.setComparator(0, new cimframe.util.OrderNumberComparator());
sorter.setComparator(3, new cimframe.util.OrderNumberComparator());
sorter.setComparator(4, new cimframe.util.OrderNumberComparator());
sorter.setComparator(5, new cimframe.util.OrderNumberComparator());
dataGrid.setRowSorter(sorter);

一个关于SWING的工程,当然会用到大量的表格最早清空表格是这样写的

//                DefaultTableModel model = (DefaultTableModel) table.getModel();
//                for (int i = model.getRowCount() - 1; i >= 0; i--) {
//                    model.removeRow(i);
//                }  

用这个方法是有问题的,因为是JTable    >> TableModel  >> TableData(Vector或String[])这样的映射关系,如果用上面的方法,如果数据增加或减少都不会通知TableModel ,就导致每次清数据就报数据越界异常ArrayIndexOutOfBoundsException。

 

如果直接清理数据是会通知上层的监听,改变模型

((DefaultTableModel) table.getModel()).getDataVector().clear();   //清除表格数据
((DefaultTableModel) table.getModel()).fireTableDataChanged();//通知模型更新
table.updateUI();//刷新表格

 

这样做了,程序好像是不出问题了,但是如果对表格做了排序操作,再看看,程序是不出错了,但是每加载一行,就看到表格会做一次排序,这个过程的开销很大,如果数据量大的话,甚至导致内存溢出。经过一天半的研究,跟踪,终于找到了问题所在,创建表的时候,引用了排序器,排序器的监听是一个独立于JTable >> TableModel >> TableData之外,又在后台影响着这三者之间的关系的一个人,在程序调试时,很难找到他在那里影响的,最终在JDK API里发现了一点端倪

javax.swing
类 RowSorter<M>

java.lang.Object
javax.swing.RowSorter<M>
类型参数:
M

 setSortKeys

public abstract void setSortKeys(List<? extends RowSorter.SortKey> keys)
设置当前排序键。
参数:
keys
SortKeys
null
toggleSortOrder
public abstract void toggleSortOrder(int column)

颠倒指定列的排序顺序。调用此方法时,由子类提供具体行为。通常,如果指定列已经是主要排序列,则此方法将升序变为降序(或将降序变为升序);否则,使指定列成为主要排序列,并使用升序排序顺序。如果指定列不可排序,则此方法没有任何效果。

如果此方法导致更改排序顺序和排序操作,则它将发送适当的 ​​RowSorterListener​​ 通知。

 

参数:

​column​​ - 要切换排序顺序的列,就底层模型而言

抛出:

​IndexOutOfBoundsException​​ - 如果列超出底层模型的范围

上面这两个方法很像,但又有区别,我先用toggleSortOrder(int column) 这个column必须有一个有效的列号,就是说,不能用-1,这个方法是不能取消对表的排序选中的。那么另一个方法setSortKeys(​​List​​<? extends​​RowSorter.SortKey​​> keys),这个就比较难了,我也不知道应该传什么参数,再看参数说明:​​null​​ 是指定一个空列表的简写,表示视图应该是未排序的。“应该”两字说的实在是诡异,我就把它当成死马医,看看到底行不行,嘿嘿,通过方法:rowSort.setSortKeys(null);把表格还原到不排序的状态,就达到我想要的结果了,大功终于告成!


​http://jingyan.baidu.com/article/fedf07377f003035ac8977c3.html​


Java JTable 点击表头,能不能进行多列排序

建议已现有Jtable开发新的Table类,加个数组用于记录排序列的先后次序,重写Jtable的表头单击事件

 



标签:int,demo,new,JTable,swing,import,table,javax
From: https://blog.51cto.com/u_15147537/5968441

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