Java实现自动补全提示的文本框

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Java Swing SQL Borland J#

使用自定义的文本框控件，从数据库中读取值对输入内容自动提示。
1.ListPopup类：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Enumeration;
import javax.swing.BorderFactory;
import javax.swing.DefaultListModel;
import javax.swing.JList;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.MouseInputListener;

/**
 *
 * @author William Chen
 */
public class ListPopup extends JPopupMenu implements MouseInputListener {
    
    private JList list;
    private JScrollPane pane;
    private ArrayList<ListSelectionListener> listeners=new ArrayList<ListSelectionListener>();
    public void addListSelectionListener(ListSelectionListener l){
        if(!listeners.contains(l))
            listeners.add(l);
    }
    public void setSelectedIndex(int index){
        if(index>=list.getModel().getSize())
            index=0;
        if(index<0)
            index=list.getModel().getSize()-1;
        list.ensureIndexIsVisible(index);
        list.setSelectedIndex(index);
    }
    public Object getSelectedValue(){
        return list.getSelectedValue();
    }
    public int getSelectedIndex(){
        return list.getSelectedIndex();
    }
    public boolean isSelected(){
        return list.getSelectedIndex()!=-1;
    }
    public void setLastOneSelected(){
        int count=list.getModel().getSize();
        if(count>0){
            list.ensureIndexIsVisible(count-1);
            list.setSelectedIndex(count-1);
        }
    }
    public void removeListSelectionListener(ListSelectionListener l){
        if(listeners.contains(l))
            listeners.remove(l);
    }
    private void fireValueChanged(ListSelectionEvent e){
        for(ListSelectionListener l:listeners){
            l.valueChanged(e);
        }
    }
    public ListPopup() {
        setLayout(new BorderLayout());
        list = new JList();
        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        list.addMouseListener(this);
        list.addMouseMotionListener(this);
        list.setModel(new DefaultListModel());
        pane = new JScrollPane(list);
        pane.setBorder(null);
        add(pane, BorderLayout.CENTER);
    }
    
    public int getItemCount() {
        DefaultListModel model = (DefaultListModel) list.getModel();
        return model.getSize();
    }
    
    public Object getItem(int index) {
        DefaultListModel model = (DefaultListModel) list.getModel();
        return model.get(index);
    }
    
    public void addItem(Object o) {
        DefaultListModel model = (DefaultListModel) list.getModel();
        model.addElement(o);
        list.repaint();
    }
    
    public void removeItem(Object o) {
        DefaultListModel model = (DefaultListModel) list.getModel();
        model.removeElement(o);
        list.repaint();
    }
    
    public void setList(Iterable iterable) {
        DefaultListModel model = new DefaultListModel();
        for (Object o : iterable) {
            model.addElement(o);
        }
        list.setModel(model);
        list.repaint();
    }
    
    public void setList(Enumeration e) {
        DefaultListModel model = new DefaultListModel();
        while (e.hasMoreElements()) {
            model.addElement(e.nextElement());
        }
        list.setModel(model);
        list.repaint();
    }
    
    public void setList(Object... objects) {
        DefaultListModel model = new DefaultListModel();
        for (Object o : objects) {
            model.addElement(o);
        }
        list.setModel(model);
        list.repaint();
    }
    

    public void mouseClicked(MouseEvent e) {
    }
    
    public void mousePressed(MouseEvent e) {
        if(list.getSelectedIndex()!=-1)
            fireValueChanged(new ListSelectionEvent(list, list.getSelectedIndex(), list.getSelectedIndex(), true));
    }
    
    public void mouseReleased(MouseEvent e) {
    }
    
    public void mouseEntered(MouseEvent e) {
    }
    
    public void mouseExited(MouseEvent e) {
    }

    public void mouseMoved(MouseEvent anEvent) {
        if (anEvent.getSource() == list) {
            Point location = anEvent.getPoint();
            Rectangle r = new Rectangle();
            list.computeVisibleRect(r);
            if (r.contains(location)) {
                updateListBoxSelectionForEvent(anEvent, false);
            }
        }
    }
    
    protected void updateListBoxSelectionForEvent(MouseEvent anEvent, boolean shouldScroll) {

        Point location = anEvent.getPoint();
        if (list == null) {
            return;
        }
        int index = list.locationToIndex(location);
        if (index == -1) {
            if (location.y < 0) {
                index = 0;
            } else {
                index = list.getModel().getSize() - 1;
            }
        }
        if (list.getSelectedIndex() != index) {
            list.setSelectedIndex(index);
            if (shouldScroll) {
                list.ensureIndexIsVisible(index);
            }
        }
    }
    
    public void mouseDragged(MouseEvent e) {
    }
}

2.AutoCompletionField类：

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;
import javax.swing.JList;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class AutoCompletionField extends JTextField implements DocumentListener, MouseListener, ListSelectionListener, ActionListener, KeyListener {
    
    private static int DEFAULT_PREFERRED_HEIGHT = 100;
    private ListPopup popup;
    private int preferredHeight = DEFAULT_PREFERRED_HEIGHT;
    private CompletionFilter filter;
    
    public void setFilter(CompletionFilter f) {
        filter = f;
    }
    
    public AutoCompletionField() {
        popup = new ListPopup();
        getDocument().addDocumentListener(this);
        addMouseListener(this);
        popup.addListSelectionListener(this);
        addActionListener(this);
        addKeyListener(this);
    }
    
    public void setPopupPreferredHeight(int h) {
        preferredHeight = h;
    }
    
    private boolean isListChange(ArrayList array) {
        if (array.size() != popup.getItemCount()) {
            return true;
        }
        for (int i = 0; i < array.size(); i++) {
            if (!array.get(i).equals(popup.getItem(i))) {
                return true;
            }
        }
        return false;
    }
    
    private void textChanged() {
		if ("".equals(this.getText()))
			popup.setVisible(false);
		else {
			if (!popup.isVisible()) {
				showPopup();
				requestFocus();
			}
			if (filter != null) {
				ArrayList array = filter.filter(getText());
				changeList(array);
			}

		}

	}
    
    private void showPopup() {
        popup.setPopupSize(getWidth(), preferredHeight);
        popup.show(this, 0, getHeight()-1);
    }
    
    private void changeList(ArrayList array) {
        if (array.size() == 0) {
            if (popup.isVisible()) {
                popup.setVisible(false);
            }
        } else {
            if (!popup.isVisible()) {
                showPopup();
            }
        }
        if (isListChange(array)&&array.size()!=0) {
            popup.setList(array);
        }
    }
    
    public void insertUpdate(DocumentEvent e) {
        textChanged();
    }
    
    public void removeUpdate(DocumentEvent e) {
        textChanged();
    }
    
    public void changedUpdate(DocumentEvent e) {
        textChanged();
    }
    
    public void mouseClicked(MouseEvent e) {
        if(e.getClickCount()>1 && !popup.isVisible())
            textChanged();
    }
    
    public void mousePressed(MouseEvent e) {
    }
    
    public void mouseReleased(MouseEvent e) {
    }
    
    public void mouseEntered(MouseEvent e) {
    }
    
    public void mouseExited(MouseEvent e) {
    }
    
    public void valueChanged(ListSelectionEvent e) {
        JList list=(JList)e.getSource();
        String text=list.getSelectedValue().toString();
        setText(text);
        popup.setVisible(false);
    }
    
    public void actionPerformed(ActionEvent e) {
        if(popup.isVisible()){
            Object o=popup.getSelectedValue();
            if(o!=null)
                setText(o.toString());
            popup.setVisible(false);
        }
        this.selectAll();
        this.requestFocus();
    }
    
    public void keyTyped(KeyEvent e) {
    }
    
    public void keyPressed(KeyEvent e) {
        if(e.getKeyCode()==KeyEvent.VK_DOWN){
            if(popup.isVisible()){
                if(!popup.isSelected())
                    popup.setSelectedIndex(0);
                else
                    popup.setSelectedIndex(popup.getSelectedIndex()+1);
            }
        }else if(e.getKeyCode()==KeyEvent.VK_UP){
            if(popup.isVisible()){
                if(!popup.isSelected())
                    popup.setLastOneSelected();
                else
                    popup.setSelectedIndex(popup.getSelectedIndex()-1);
            }
        }else if(e.getKeyCode()==KeyEvent.VK_PAGE_DOWN){
            if(popup.isVisible()){
                if(!popup.isSelected())
                    popup.setSelectedIndex(0);
                else
                    popup.setSelectedIndex(popup.getSelectedIndex()+5);
            }
        }else if(e.getKeyCode()==KeyEvent.VK_PAGE_UP){
            if(popup.isVisible()){
                if(!popup.isSelected())
                    popup.setLastOneSelected();
                else
                    popup.setSelectedIndex(popup.getSelectedIndex()-5);
            }
        }
    }
    
    public void keyReleased(KeyEvent e) {
    }
}

3.CompletionFilter类：

import java.util.ArrayList;

public interface CompletionFilter {
    ArrayList filter(String text);
}

4.DefaultCompletionFilter类：

import java.util.ArrayList;
import java.util.Vector;

public class DefaultCompletionFilter implements CompletionFilter {

    private Vector vector;

    public DefaultCompletionFilter() {
        vector = new Vector();
    }

    public DefaultCompletionFilter(Vector v) {
        vector = v;
    }
    public ArrayList filter(String text) {
        ArrayList list=new ArrayList();
        String txt=text.trim();
        int length=txt.length();
        for(int i=0;i<vector.size();i++){
            Object o=vector.get(i);
            String str=o.toString();
            if(length==0||str.startsWith(txt))   //输入内容与记录前端比较
                list.add(o);
        }
        return list;
    }
}

5.使用的控件MyAutoField，使用时指定查询条件和自动提示的字段：

import java.awt.im.InputMethodRequests;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import com.borland.jbcl.layout.XYConstraints;
import com.borland.jbcl.layout.XYLayout;
import yz.jlsys.connect.connector;

public class MyAutoField extends AutoCompletionField {
	
    /** Creates new form AutoCompletionFrame */
    public MyAutoField(String sql,String field) {
    	super();
        Vector tempvector = new Vector();
        connector connec = new connector(); // 数据库操作对象
		ResultSet rs = connec.getResult(sql);
		try{
			//若结果集不为空，则显示每条记录
			boolean isexist = false;
			isexist = rs.first();
			
			if(isexist)
			{
				//移动光标到零的位置
				rs.beforeFirst();
				while(rs.next() )
				{
					if(tempvector.contains(rs.getString(field)))
						continue;
					tempvector.add(rs.getString(field));
				}
			}
		}
		catch(SQLException e){
		    
		}
        this.setFilter(new DefaultCompletionFilter(tempvector));
    }
    
    public InputMethodRequests getInputMethodRequests() { 
        return null;  
    } 
    
    public static void main(String args[]) {
    	
    	try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception ex) {
        }
        JFrame j = new JFrame();
		j.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		JPanel contentPane = new JPanel();
		j.setContentPane(contentPane);
		contentPane.setLayout(new XYLayout());
		j.setSize(800,720);
		j.getContentPane().add(new MyAutoField("select * from clienttable where CLIENTNAME like '%'", "CLIENTNAME"), new XYConstraints(40, 95, 200, 25));
		j.setVisible(true);
        
    }
}

以上5个文件放到同一个包中，从MyAutoField的main可运行。

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