提供有china.xml和china.sql文件，实现全国省市区的三级联动效果
一、xml实现
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
import java.awt.Font;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.DefaultComboBoxModel;
@SuppressWarnings("serial")
public class ChinaJFrame extends JFrame {
private JPanel contentPane;
private List<String> cityList=null;
private List<String> provinceList=null;
private List<String> countyList=null;
@SuppressWarnings("rawtypes")
private JComboBox provinceComboBox, cityComboBox, countyComboBox;
SAXReader reader = new SAXReader();
Document document = null;
List<String> list=null;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ChinaJFrame frame = new ChinaJFrame();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*
* @throws DocumentException
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public ChinaJFrame() throws DocumentException {
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
provinceComboBox = new JComboBox();
provinceComboBox.setModel(new DefaultComboBoxModel(new String[] { "省份" }));
provinceComboBox.setBounds(33, 106, 108, 21);
cityComboBox = new JComboBox();
cityComboBox.setBounds(171, 106, 108, 21);
cityComboBox.setModel(new DefaultComboBoxModel(new String[] { "地级市" }));
countyComboBox = new JComboBox();
countyComboBox.setBounds(302, 106, 108, 21);
countyComboBox.setModel(new DefaultComboBoxModel(new String[] { "市、县级市" }));
provinceList = getProvince("province");
for (String s : provinceList) {
provinceComboBox.addItem(s);
}
provinceComboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange() == ItemEvent.SELECTED){
int ProvinceIndex = provinceComboBox.getSelectedIndex();
cityList = getCity(ProvinceIndex);
cityComboBox.removeAllItems();
for (String s : cityList) {
cityComboBox.addItem(s);
}
}
}
});
cityComboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange() == ItemEvent.SELECTED){
cityComboBox=(JComboBox) e.getSource();
String name2=(String) cityComboBox.getSelectedItem();
countyList=getCounty(name2);
countyComboBox.removeAllItems();
for(String cl:countyList){
countyComboBox.addItem(cl);
}
}
}
});
JLabel lblNewLabel = new JLabel(
"u5168u56FDu57CEu5E02u4E09u7EA7u8054u52A8");
lblNewLabel.setFont(new Font("宋体", Font.BOLD, 18));
lblNewLabel.setBounds(140, 25, 160, 48);
contentPane.add(provinceComboBox);
contentPane.add(cityComboBox);
contentPane.add(countyComboBox);
contentPane.add(lblNewLabel);
}
@SuppressWarnings("unchecked")
public List<String> getProvince(String name) {
list = new ArrayList<String>();
try {
document = reader.read(new File("src/china.xml"));
} catch (DocumentException e) {
e.printStackTrace();
}
Element root = document.getRootElement();
for(Iterator<Element> i = root.elementIterator(name); i.hasNext();) {
Element node = i.next();
List<Attribute> attrs = node.attributes();
if (attrs != null) {
for (Attribute attr : attrs) {
list.add(attr.getValue());
}
}
}
return list;
}
@SuppressWarnings("unchecked")
public List<String> getCity(int index) {
list = new ArrayList<String>();
try {
document = reader.read(new File("src/china.xml"));
} catch (DocumentException e) {
e.printStackTrace();
}
Element root = document.getRootElement();
List<Element> elements = root.elements();
List<Element> elements1 = elements.get(index-1).elements();
for (int i=0; i < elements1.size(); i++) {
List<Attribute> attrs = elements1.get(i).attributes();
if (attrs != null) {
for (Attribute attr : attrs) {
list.add(attr.getValue());
}
}
}
return list;
}
@SuppressWarnings("unchecked")
public List<String> getCounty(String name2){
list = new ArrayList<String>();
try {
document = reader.read(new File("src/china.xml"));
} catch (DocumentException e) {
e.printStackTrace();
}
////province[@name='北京市']
List<Node> nodes = document.selectNodes("//city[@name='" + name2 + "']//county//@name");
for (Node node : nodes) {
list.add(node.getText());
}
return list;
}
}
二、数据库实现
（1）数据库连接的配置文件
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<!-- 指定名称的配置 -->
<named-config name="oa">
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/china</property>
<property name="user">root</property>
<property name="password">root</property>
<property name="maxPoolSize">100</property>
<property name="initialPoolSize">20</property>
<property name="minPoolSize">10</property>
<property name="acquireIncrement">5</property>
</named-config>
<!-- 缺省的配置 -->
<default-config>
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/china</property>
<property name="user">root</property>
<property name="password">root</property>
<property name="maxPoolSize">100</property>
<property name="initialPoolSize">20</property>
<property name="minPoolSize">10</property>
<property name="acquireIncrement">5</property>
</default-config>
</c3p0-config>
（2）实体Bean
public class Province {//省
private Integer id;
private String name;
}
public class City {//市
private Integer id;
private String name;
private Integer p_id;
}
public class County {//区
private Integer id;
private String name;
private Integer c_id;
}
（3）数据库操作接口定义和实现
public interface ChinaDao<T> {
List<T> getObjects();
List<T> getCityObjectsById(Integer id);
List<T> getCountyObjectsById(Integer id);
City getIdByName(String name);
}
public class ChinaDaoImpl<T> implements ChinaDao<T>{
private JdbcTemplate jdbcTemplate=new JdbcTemplate(DBConn.getDataSourse());
private List<T> entities=null;
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public List<T> getObjects() {
String sql="select id, name from province";
entities=jdbcTemplate.query(sql, new RowMapper(){
@Override
public Object mapRow(ResultSet rs, int arg1) throws SQLException {
Province province=new Province();
province.setId(rs.getInt("id"));
province.setName(rs.getString("name"));
return province;
}
});
return entities;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public List<T> getCityObjectsById(Integer id) {
String sql="select id, name ,p_id from city where p_id=?";
entities=jdbcTemplate.query(sql, new Object[]{id},new RowMapper(){
@Override
public Object mapRow(ResultSet rs, int arg1) throws SQLException {
City city=new City();
city.setId(rs.getInt("id"));
city.setName(rs.getString("name"));
city.setP_id(rs.getInt("p_id"));
return city;
}
});
return entities;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public List<T> getCountyObjectsById(Integer id) {
String sql="select id, name ,c_id from county where c_id=?";
entities=jdbcTemplate.query(sql, new Object[]{id},new RowMapper(){
@Override
public Object mapRow(ResultSet rs, int arg1) throws SQLException {
County county=new County();
county.setId(rs.getInt("id"));
county.setName(rs.getString("name"));
county.setC_id(rs.getInt("c_id"));
return county;
}
});
return entities;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public City getIdByName(String name) {
String sql="select id, name ,p_id from city where name=?";
City entity=jdbcTemplate.queryForObject(sql, new Object[]{name},new RowMapper(){
@Override
public Object mapRow(ResultSet rs, int arg1) throws SQLException {
City city=new City();
city.setId(rs.getInt("id"));
city.setName(rs.getString("name"));
city.setP_id(rs.getInt("p_id"));
return city;
}
});
return entity;
}
}
（4）具体实现
public class ChinaJFrame extends JFrame {
private ChinaDao chinaDao=new ChinaDaoImpl();
private JPanel contentPane;
private List<String> cityList=null;
private List<String> provinceList=null;
private List<String> countyList=null;
@SuppressWarnings("rawtypes")
private JComboBox provinceComboBox, cityComboBox, countyComboBox;
SAXReader reader = new SAXReader();
Document document = null;
List<String> list=null;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ChinaJFrame frame = new ChinaJFrame();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*
* @throws DocumentException
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public ChinaJFrame() throws DocumentException {
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
provinceComboBox = new JComboBox();
provinceComboBox.setModel(new DefaultComboBoxModel(new String[] { "省份" }));
provinceComboBox.setBounds(33, 106, 108, 21);
cityComboBox = new JComboBox();
cityComboBox.setBounds(171, 106, 108, 21);
cityComboBox.setModel(new DefaultComboBoxModel(new String[] { "地级市" }));
countyComboBox = new JComboBox();
countyComboBox.setBounds(302, 106, 108, 21);
countyComboBox.setModel(new DefaultComboBoxModel(new String[] { "市、县级市" }));
List<Province> provinces=chinaDao.getObjects();
provinceList = new ArrayList<String>();
for(Province p:provinces){
provinceList.add(p.getName());
}
for (String s : provinceList) {
provinceComboBox.addItem(s);
}
provinceComboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange() == ItemEvent.SELECTED){
cityList=new ArrayList<String>();
int ProvinceIndex = provinceComboBox.getSelectedIndex();
List<City> cities=chinaDao.getCityObjectsById(ProvinceIndex);
for(City city:cities){
cityList.add(city.getName());
}
cityComboBox.removeAllItems();
for (String s : cityList) {
cityComboBox.addItem(s);
}
}
}
});
cityComboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange() == ItemEvent.SELECTED){
cityComboBox=(JComboBox) e.getSource();
String name=(String) cityComboBox.getSelectedItem();
countyList=new ArrayList<String>();
int CityIndex = chinaDao.getIdByName(name).getId();
List<County> counties=chinaDao.getCountyObjectsById(CityIndex);
for(County county:counties){
countyList.add(county.getName());
}
countyComboBox.removeAllItems();
for(String cl:countyList){
countyComboBox.addItem(cl);
}
}
}
});
JLabel lblNewLabel = new JLabel(
"u5168u56FDu57CEu5E02u4E09u7EA7u8054u52A8");
lblNewLabel.setFont(new Font("宋体", Font.BOLD, 18));
lblNewLabel.setBounds(140, 25, 160, 48);
contentPane.add(provinceComboBox);
contentPane.add(cityComboBox);
contentPane.add(countyComboBox);
contentPane.add(lblNewLabel);
}
}