Java实现Map集合二级联动示例

import java.util.LinkedHashMap;import java.util.Map;public class CityMap {    /**     * 全国（省，直辖市，自治区）映射集合     */    public static Map<String,String[]> model=new LinkedHashMap<String, String[]>();    static{        model.put("北京", new String[]{"北京"});        model.put("上海", new String[]{"上海"});        model.put("天津", new String[]{"天津"});        model.put("重庆", new String[]{"重庆"});        model.put("黑龙江", new String[]{"哈尔滨","齐齐哈尔","牡丹江","大庆","伊春","双鸭山","鹤岗","鸡西","佳木斯","七台河","黑河","绥化","大兴安岭"});        model.put("吉林", new String[]{"长春","延边","吉林","白山","白城","四平","松原","辽源","大安","通化"});        model.put("辽宁", new String[]{"沈阳","大连","葫芦岛","旅顺","本溪","抚顺","铁岭","辽阳","营口","阜新","朝阳","锦州","丹东","鞍山"});        model.put("内蒙古", new String[]{"呼和浩特","呼伦贝尔","锡林浩特","包头","赤峰","海拉尔","乌海","鄂尔多斯","通辽"});        model.put("河北", new String[]{"石家庄","唐山","张家口","廊坊","邢台","邯郸","沧州","衡水","承德","保定","秦皇岛"});        model.put("河南", new String[]{"郑州","开封","洛阳","平顶山","焦作","鹤壁","新乡","安阳","濮阳","许昌","漯河","三门峡","南阳","商丘","信阳","周口","驻马店"});        model.put("山东", new String[]{"济南","青岛","淄博","威海","曲阜","临沂","烟台","枣庄","聊城","济宁","菏泽","泰安","日照","东营","德州","滨州","莱芜","潍坊"});        model.put("山西", new String[]{"太原","阳泉","晋城","晋中","临汾","运城","长治","朔州","忻州","大同","吕梁"});        model.put("江苏", new String[]{"南京","苏州","昆山","南通","太仓","吴县","徐州","宜兴","镇江","淮安","常熟","盐城","泰州","无锡","连云港","扬州","常州","宿迁"});        model.put("安徽", new String[]{"合肥","巢湖","蚌埠","安庆","六安","滁州","马鞍山","阜阳","宣城","铜陵","淮北","芜湖","毫州","宿州","淮南","池州"});        model.put("陕西", new String[]{"西安","韩城","安康","汉中","宝鸡","咸阳","榆林","渭南","商洛","铜川","延安"});        model.put("宁夏", new String[]{"银川","固原","中卫","石嘴山","吴忠"});        model.put("甘肃", new String[]{"兰州","白银","庆阳","酒泉","天水","武威","张掖","甘南","临夏","平凉","定西","金昌"});        model.put("青海", new String[]{"西宁","海北","海西","黄南","果洛","玉树","海东","海南"});        model.put("湖北", new String[]{"武汉","宜昌","黄冈","恩施","荆州","神农架","十堰","咸宁","襄樊","孝感","随州","黄石","荆门","鄂州"});        model.put("湖南", new String[]{"长沙","邵阳","常德","郴州","吉首","株洲","娄底","湘潭","益阳","永州","岳阳","衡阳","怀化","韶山","张家界"});        model.put("浙江", new String[]{"杭州","湖州","金华","宁波","丽水","绍兴","雁荡山","衢州","嘉兴","台州","舟山","温州"});        model.put("江西", new String[]{"南昌","萍乡","九江","上饶","抚州","吉安","鹰潭","宜春","新余","景德镇","赣州"});        model.put("福建", new String[]{"福州","厦门","龙岩","南平","宁德","莆田","泉州","三明","漳州"});        model.put("贵州", new String[]{"贵阳","安顺","赤水","遵义","铜仁","六盘水","毕节","凯里","都匀"});        model.put("四川", new String[]{"成都","泸州","内江","凉山","阿坝","巴中","广元","乐山","绵阳","德阳","攀枝花","雅安","宜宾","自贡","甘孜州","达州","资阳","广安","遂宁","眉山","南充"});        model.put("广东", new String[]{"广州","深圳","潮州","韶关","湛江","惠州","清远","东莞","江门","茂名","肇庆","汕尾","河源","揭阳","梅州","中山","德庆","阳江","云浮","珠海","汕头","佛山"});        model.put("广西", new String[]{"南宁","桂林","阳朔","柳州","梧州","玉林","桂平","贺州","钦州","贵港","防城港","百色","北海","河池","来宾","崇左"});        model.put("云南", new String[]{"昆明","保山","楚雄","德宏","红河","临沧","怒江","曲靖","思茅","文山","玉溪","昭通","丽江","大理"});        model.put("海南", new String[]{"海口","三亚","儋州","琼山","通什","文昌"});        model.put("新疆", new String[]{"乌鲁木齐","阿勒泰","阿克苏","昌吉","哈密","和田","喀什","克拉玛依","石河子","塔城","库尔勒","吐鲁番","伊宁"});    }}

import java.awt.Graphics;import java.awt.Image;import javax.swing.JPanel;/** * 带背景的面板组件 *  * @author ZhongWei Lee */public class BackgroundPanel extends JPanel {    /**     *      */    private static final long serialVersionUID = 7758689434195492602L;    /**     * 背景图片     */    private Image image;    /**     * 构造方法     */    public BackgroundPanel() {        super();        setOpaque(false);        setLayout(null);    }    /**     * 设置图片的方法     */    public void setImage(Image image) {        this.image = image;    }    @Override    protected void paintComponent(Graphics g) {// 重写绘制组件外观        if (image != null) {            int width = getWidth();// 获取组件大小            int height = getHeight();            g.drawImage(image, 0, 0, width, height, this);// 绘制图片与组件大小相同        }        super.paintComponent(g);// 执行超类方法    }}

import java.awt.Image;import java.awt.Toolkit;import java.io.BufferedInputStream;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.util.HashMap;import java.util.Iterator;import javax.swing.ImageIcon;/** * Utility class for managing resources such as colors, fonts, images, etc. *  * This class may be freely distributed as part of any application or plugin. * <p> * Copyright (c) 2003 - 2004, Instantiations, Inc. <br>All Rights Reserved *  * @author scheglov_ke */public class SwingResourceManager {    /**     * Maps image names to images     */    private static HashMap<String, Image> m_ClassImageMap = new HashMap<String, Image>();    /**     * Returns an image encoded by the specified input stream     * @param is InputStream The input stream encoding the image data     * @return Image The image encoded by the specified input stream     */    private static Image getImage(InputStream is) {        try {            ByteArrayOutputStream baos = new ByteArrayOutputStream();            byte buf[] = new byte[1024 * 4];            while (true) {                int n = is.read(buf);                if (n == -1)                    break;                baos.write(buf, 0, n);            }            baos.close();            return Toolkit.getDefaultToolkit().createImage(baos.toByteArray());        } catch (Throwable e) {            return null;        }    }    /**     * Returns an image stored in the file at the specified path relative to the specified class     * @param clazz Class The class relative to which to find the image     * @param path String The path to the image file     * @return Image The image stored in the file at the specified path     */    public static Image getImage(Class<?> clazz, String path) {        String key = clazz.getName() + '|' + path;        Image image = m_ClassImageMap.get(key);        if (image == null) {            if ((path.length() > 0) && (path.charAt(0) == '/')) {                String newPath = path.substring(1, path.length());                image = getImage(new BufferedInputStream(clazz.getClassLoader().getResourceAsStream(newPath)));            } else {                image = getImage(clazz.getResourceAsStream(path));            }            m_ClassImageMap.put(key, image);        }        return image;    }    /**     * Returns an image stored in the file at the specified path     * @param path String The path to the image file     * @return Image The image stored in the file at the specified path     */    public static Image getImage(String path) {        return getImage("default", path); //$NON-NLS-1$    }    /**     * Returns an image stored in the file at the specified path     * @param section String The storage section in the cache     * @param path String The path to the image file     * @return Image The image stored in the file at the specified path     */    public static Image getImage(String section, String path) {        String key = section + '|' + SwingResourceManager.class.getName() + '|' + path;        Image image = m_ClassImageMap.get(key);        if (image == null) {            try {                FileInputStream fis = new FileInputStream(path);                image = getImage(fis);                m_ClassImageMap.put(key, image);                fis.close();            } catch (IOException e) {                return null;            }        }        return image;    }    /**     * Clear cached images in specified section     * @param section the section do clear     */    public static void clearImages(String section) {        for (Iterator<String> I = m_ClassImageMap.keySet().iterator(); I.hasNext();) {            String key = I.next();            if (!key.startsWith(section + '|'))                continue;            Image image = m_ClassImageMap.get(key);            image.flush();            I.remove();        }    }    /**     * Returns an icon stored in the file at the specified path relative to the specified class     * @param clazz Class The class relative to which to find the icon     * @param path String The path to the icon file     * @return Icon The icon stored in the file at the specified path     */    public static ImageIcon getIcon(Class<?> clazz, String path) {        return getIcon(getImage(clazz, path));    }    /**     * Returns an icon stored in the file at the specified path     * @param path String The path to the icon file     * @return Icon The icon stored in the file at the specified path     */    public static ImageIcon getIcon(String path) {        return getIcon("default", path); //$NON-NLS-1$    }    /**     * Returns an icon stored in the file at the specified path     * @param section String The storage section in the cache     * @param path String The path to the icon file     * @return Icon The icon stored in the file at the specified path     */    public static ImageIcon getIcon(String section, String path) {        return getIcon(getImage(section, path));    }    /**     * Returns an icon based on the specified image     * @param image Image The original image     * @return Icon The icon based on the image     */    public static ImageIcon getIcon(Image image) {        if (image == null)            return null;        return new ImageIcon(image);    }}

import java.awt.EventQueue;import java.awt.event.ItemEvent;import java.awt.event.ItemListener;import java.util.Map;import java.util.Set;import javax.swing.DefaultComboBoxModel;import javax.swing.JButton;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.SwingConstants;import javax.swing.UIManager;import javax.swing.border.TitledBorder; public class MainFrame extends JFrame {    /**     *      */    private static final long serialVersionUID = -4595347311922711984L;    private JTextField textField_3;    private JTextField textField_1;    private JComboBox comboBox_1;    private JTextField textField;    private JComboBox cityComboBox;    private JComboBox comboBox;    /**     * Launch the application     *      * @param args     */    public static void main(String args[]) {        EventQueue.invokeLater(new Runnable() {            public void run() {                try {                    UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");                    MainFrame frame = new MainFrame();                    frame.setVisible(true);                } catch (Exception e) {                    e.printStackTrace();                }            }        });    }    /**     * Create the frame     */    public MainFrame() {        getContentPane().setLayout(null);        setBounds(100, 100, 518, 379);        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //获取默认的市/县        String province=(String)getProvince()[0];        setTitle("输入指定省/直辖市查询对应的市县");        final BackgroundPanel backgroundPanel = new BackgroundPanel();        backgroundPanel.setImage(SwingResourceManager.getImage(MainFrame.class, "/images/background.jpg"));        backgroundPanel.setBounds(0, 0, 510, 380);        getContentPane().add(backgroundPanel);        final JPanel panel = new JPanel();        panel.setOpaque(false);        panel.setBounds(36, 126, 438, 70);        backgroundPanel.add(panel);        panel.setLayout(null);        panel.setBorder(new TitledBorder(null, "居住地", TitledBorder.DEFAULT_JUSTIFICATION, TitledBorder.DEFAULT_POSITION, null, null));        cityComboBox = new JComboBox();        cityComboBox.setBounds(245, 25, 124, 27);        panel.add(cityComboBox);        cityComboBox.setModel(new DefaultComboBoxModel(getCity(province)));        comboBox = new JComboBox();        comboBox.setBounds(25, 25, 124, 27);        panel.add(comboBox);        comboBox.addItemListener(new ItemListener() {            public void itemStateChanged(final ItemEvent e) { // 选项状态更改事件                itemChange();            }        });        comboBox.setModel(new DefaultComboBoxModel(getProvince())); // 添加省份信息        final JLabel label = new JLabel();        label.setText("省/直辖市");        label.setBounds(155, 30, 66, 18);        panel.add(label);        final JLabel label_1 = new JLabel();        label_1.setText("市/县");        label_1.setBounds(375, 30, 37, 18);        panel.add(label_1);        final JLabel label_2 = new JLabel();        label_2.setBounds(36, 43, 65, 18);        backgroundPanel.add(label_2);        label_2.setHorizontalAlignment(SwingConstants.RIGHT);        label_2.setHorizontalTextPosition(SwingConstants.LEADING);        label_2.setText("姓    名：");        textField = new JTextField();        textField.setBounds(113, 38, 154, 28);        backgroundPanel.add(textField);        final JLabel label_3 = new JLabel();        label_3.setBounds(36, 84, 65, 18);        backgroundPanel.add(label_3);        label_3.setHorizontalAlignment(SwingConstants.RIGHT);        label_3.setHorizontalTextPosition(SwingConstants.LEADING);        label_3.setText("性    别：");        comboBox_1 = new JComboBox();        comboBox_1.setBounds(113, 81, 66, 25);        backgroundPanel.add(comboBox_1);        comboBox_1.setModel(new DefaultComboBoxModel(new String[] {"男", "女"}));        final JLabel label_4 = new JLabel();        label_4.setBounds(36, 212, 65, 18);        backgroundPanel.add(label_4);        label_4.setHorizontalAlignment(SwingConstants.RIGHT);        label_4.setHorizontalTextPosition(SwingConstants.LEADING);        label_4.setText("详细地址：");        textField_1 = new JTextField();        textField_1.setBounds(113, 208, 367, 28);        backgroundPanel.add(textField_1);        final JLabel label_4_1 = new JLabel();        label_4_1.setBounds(36, 252, 65, 18);        backgroundPanel.add(label_4_1);        label_4_1.setHorizontalTextPosition(SwingConstants.LEADING);        label_4_1.setHorizontalAlignment(SwingConstants.RIGHT);        label_4_1.setText("E-mail：");        textField_3 = new JTextField();        textField_3.setBounds(113, 248, 367, 27);        backgroundPanel.add(textField_3);        final JButton button = new JButton();        button.setBounds(159, 289, 75, 28);        backgroundPanel.add(button);        button.setText("保存");        final JButton button_1 = new JButton();        button_1.setBounds(265, 289, 75, 28);        backgroundPanel.add(button_1);        button_1.setText("重置");        //    }    /**     * 获取省、直辖市，自治区     *      * @return     */    public Object[] getProvince() {        Map<String, String[]> map = CityMap.model;// 获取省份信息保存到Map中        Set<String> set = map.keySet(); // 获取Map集合中的键，并以Set集合返回        Object[] province = set.toArray(); // 转换为数组        return province; // 返回获取的省份信息    }    /**     * 获取指定省对应的市/县     *      * @param selectProvince     * @return     */    public String[] getCity(String selectProvince) {        Map<String, String[]> map = CityMap.model; // 获取省份信息保存到Map中        String[] arrCity = map.get(selectProvince); // 获取指定键的值        return arrCity; // 返回获取的市/县    }    private void itemChange() {        String selectProvince = (String) comboBox.getSelectedItem();        cityComboBox.removeAllItems(); // 清空市/县列表        String[] arrCity = getCity(selectProvince); // 获取市/县        cityComboBox.setModel(new DefaultComboBoxModel(arrCity)); // 重新添加市/县列表的值    }}