我想要的是一个可编辑的 jcombobox。当用户输入它时，它应该搜索数据库并在数据库中显示以用户输入的文本开头的名称。例如。: 如果用户输入 'a' 。然后 jcombobox 应该显示数据库中以 'a' 开头的所有名称。
如果数据库包含名称 aaron,aidan,kim 。当用户键入“a”时，组合框应建议名称 aaron 和 aidan
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package Main;
/**
*
* @author John
*/
import javax.swing.event.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Vector;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JOptionPane;
import javax.swing.MutableComboBoxModel;
import javax.swing.text.JTextComponent;
public class test extends javax.swing.JFrame {
/**
* Creates new form test
*/
public test() {
initComponents();
((JTextComponent) jComboBox1.getEditor().getEditorComponent()).getDocument().addDocumentListener(new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent e) {
String tmp = jComboBox1.getEditor().getItem().toString();
ArrayList<String> scripts = new ArrayList<String>();
String str1="";
try
{
String str="SELECT item FROM item WHERE item LIKE '"+tmp+"%'";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:ds1", "sa" , "creative");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(str);
while(rs.next())
{
str1=rs.getString("item");
scripts.add(str1);
jComboBox1.addItem(str1);
}
}
catch(Exception ex)
{
System.out.println("error"+ex);
}
}
@Override
public void removeUpdate(DocumentEvent e) {
String tmp = jComboBox1.getEditor().getItem().toString();
}
@Override
public void changedUpdate(DocumentEvent e) {
}
});
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jComboBox1 = new javax.swing.JComboBox();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jComboBox1.setEditable(true);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(105, 105, 105)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 240, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(141, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(86, 86, 86)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(194, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(test.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(test.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(test.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(test.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new test().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JComboBox jComboBox1;
// End of variables declaration
}
当我运行它时，jcombobox 只显示数据库中以输入的字母开头的名字。错误跟随 errorjava.lang.IllegalStateException: Attempt to mutate in notification