JQuery Ajax三级联动地区下拉框

JSP部分代码

 

 

 

 
  
   
    请选择省份...
            
  
        

        
                
   
    请选择城市...
           
  
               
        
        
        
  
   
    请选择城区...
           
  
 

 

 

JAVA部分代码 Servlet

 

 response.setContentType("text/xml;charset=utf-8");
  response.setHeader("Pragma","No-cache");
  response.setDateHeader("Expires",0);
  response.setHeader("Cache-Control","no-cache");    
  PrintWriter out=response.getWriter();

  String areaId = request.getParameter("areaId");
  
  if(areaId==null || areaId.trim().length()<=0){
   //sb.append("系统错误地区id为空");
   //out.print(sb.toString());
   return;
  }  
  

  //注意这个是为了解决跨域访问的问题
  String callback = request.getParameter("callback");   
  
  try {

   List areaList = AreaService.getInstance().getAreasByParentId(Integer.parseInt(areaId));

   // 取集合
   JSONArray jsonArray = JSONArray.fromObject(areaList);

   JSONObject jsobjcet = new JSONObject();

   jsobjcet.put("data", jsonArray);
   
   response.getWriter().write(callback+"("+jsobjcet.toString()+");");

   log.info(callback+"("+jsobjcet.toString()+");");
   
   
  } catch (IOException e) {
   e.printStackTrace();
  }
    

 

DAO部分代码

public List getAreasByParentId(int parentId) {
  Connection conn=null;
  Statement stm=null;
  ResultSet rs=null;
  List list = new ArrayList();
  try{
   conn = ConnectionPool.getConnection();
   if( conn == null ) throw new Exception("DataBase connection error");
   stm = conn.createStatement();
   String sql ="select * from n_area where parent_id =" + parentId;
   rs = stm.executeQuery(sql);
   AreaInfo areaInfo = null;
   while( rs.next() ) {
    areaInfo= new AreaInfo();
    areaInfo.setId(rs.getInt("id"));
    areaInfo.setName(rs.getString("name"));
    areaInfo.setParentId(rs.getInt("parent_id"));
    list.add(areaInfo);
   }
  }catch(Exception e){
   log.error("getAreasByParentId() error:"+e.getMessage());
  }finally{
   ConnectionPool.release(conn,stm,rs); //释放资源
  }
  return list;
 }

 

 

数据表结构

CREATE TABLE `n_area` (
  `id` int(11) NOT NULL auto_increment,
  `name` varchar(20) default NULL,
  `parent_id` int(11) NOT NULL default '0',
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=224 DEFAULT CHARSET=gbk;

记录

 

INSERT INTO `n_area` VALUES ('1', '广东省', '0');
INSERT INTO `n_area` VALUES ('2', '北京', '0');
INSERT INTO `n_area` VALUES ('3', '深圳市', '1');
INSERT INTO `n_area` VALUES ('4', '广州市', '1');
INSERT INTO `n_area` VALUES ('5', '北京五环以内', '2');
INSERT INTO `n_area` VALUES ('6', '天津', '0');
INSERT INTO `n_area` VALUES ('7', '天津市', '6');
INSERT INTO `n_area` VALUES ('14', '珠海市', '1');
INSERT INTO `n_area` VALUES ('15', '汕头市', '1');
INSERT INTO `n_area` VALUES ('16', '佛山市', '1');
INSERT INTO `n_area` VALUES ('17', '东莞市', '1');
INSERT INTO `n_area` VALUES ('22', '肇庆市', '1');
INSERT INTO `n_area` VALUES ('23', '惠州市', '1');
INSERT INTO `n_area` VALUES ('24', '清远市', '1');
INSERT INTO `n_area` VALUES ('25', '韶关市', '1');
INSERT INTO `n_area` VALUES ('26', '湛江市', '1');
INSERT INTO `n_area` VALUES ('27', '潮州市', '1');
INSERT INTO `n_area` VALUES ('28', '梅州市', '1');
INSERT INTO `n_area` VALUES ('29', '茂名市', '1');
INSERT INTO `n_area` VALUES ('30', '浙江省', '0');
INSERT INTO `n_area` VALUES ('31', '江苏省', '0');
INSERT INTO `n_area` VALUES ('32', '福建省', '0');
INSERT INTO `n_area` VALUES ('33', '广西省', '0');
INSERT INTO `n_area` VALUES ('34', '江西省', '0');
INSERT INTO `n_area` VALUES ('35', '山东省', '0');
INSERT INTO `n_area` VALUES ('36', '湖南省', '0');
INSERT INTO `n_area` VALUES ('37', '安徽省', '0');
INSERT INTO `n_area` VALUES ('38', '贵州省', '0');
INSERT INTO `n_area` VALUES ('39', '黑龙江省', '0');
INSERT INTO `n_area` VALUES ('40', '辽宁省', '0');
INSERT INTO `n_area` VALUES ('41', '四川省', '0');
INSERT INTO `n_area` VALUES ('42', '湖北省', '0');
INSERT INTO `n_area` VALUES ('43', '陕西省', '0');
INSERT INTO `n_area` VALUES ('44', '河南省', '0');
INSERT INTO `n_area` VALUES ('45', '山西省', '0');
INSERT INTO `n_area` VALUES ('46', '海南省', '0');
INSERT INTO `n_area` VALUES ('47', '杭州市', '30');
INSERT INTO `n_area` VALUES ('48', '温州市', '30');
INSERT INTO `n_area` VALUES ('49', '宁波市', '30');
INSERT INTO `n_area` VALUES ('50', '台州市', '30');
INSERT INTO `n_area` VALUES ('51', '南京市', '31');
INSERT INTO `n_area` VALUES ('52', '无锡市', '31');
INSERT INTO `n_area` VALUES ('53', '苏州市', '31');
INSERT INTO `n_area` VALUES ('54', '常州市', '31');
INSERT INTO `n_area` VALUES ('55', '徐州市', '31');
INSERT INTO `n_area` VALUES ('56', '福州市', '32');
INSERT INTO `n_area` VALUES ('57', '厦门市', '32');
INSERT INTO `n_area` VALUES ('58', '泉州市', '32');
INSERT INTO `n_area` VALUES ('59', '漳州市', '32');
INSERT INTO `n_area` VALUES ('60', '南宁市', '33');
INSERT INTO `n_area` VALUES ('61', '桂林市', '33');
INSERT INTO `n_area` VALUES ('62', '柳州市', '33');
INSERT INTO `n_area` VALUES ('63', '百色市', '33');
INSERT INTO `n_area` VALUES ('64', '南昌市', '34');
INSERT INTO `n_area` VALUES ('65', '赣州市', '34');
INSERT INTO `n_area` VALUES ('66', '济南市', '35');
INSERT INTO `n_area` VALUES ('67', '青岛市', '35');
INSERT INTO `n_area` VALUES ('68', '长沙市', '36');
INSERT INTO `n_area` VALUES ('69', '合肥市', '37');
INSERT INTO `n_area` VALUES ('70', '贵阳市', '38');
INSERT INTO `n_area` VALUES ('71', '哈尔滨市', '39');
INSERT INTO `n_area` VALUES ('72', '大连市', '40');
INSERT INTO `n_area` VALUES ('73', '成都市', '41');
INSERT INTO `n_area` VALUES ('74', '武汉市', '42');
INSERT INTO `n_area` VALUES ('75', '西安市', '43');
INSERT INTO `n_area` VALUES ('76', '郑州市', '44');
INSERT INTO `n_area` VALUES ('77', '太原市', '45');
INSERT INTO `n_area` VALUES ('78', '海口市', '46');
INSERT INTO `n_area` VALUES ('79', '中山市', '1');
INSERT INTO `n_area` VALUES ('80', '顺德市', '1');
INSERT INTO `n_area` VALUES ('81', '江门市', '1');
INSERT INTO `n_area` VALUES ('82', '云浮市', '1');
INSERT INTO `n_area` VALUES ('83', '阳江市', '1');
INSERT INTO `n_area` VALUES ('84', '揭阳市', '1');
INSERT INTO `n_area` VALUES ('85', '河源市', '1');
INSERT INTO `n_area` VALUES ('86', '重庆', '0');
INSERT INTO `n_area` VALUES ('87', '重庆市区', '86');
INSERT INTO `n_area` VALUES ('88', '上海', '0');
INSERT INTO `n_area` VALUES ('89', '上海市', '88');
INSERT INTO `n_area` VALUES ('91', '北京五环以外', '2');
INSERT INTO `n_area` VALUES ('93', '重庆郊区', '86');
INSERT INTO `n_area` VALUES ('94', '河北省', '0');
INSERT INTO `n_area` VALUES ('95', '石家庄市', '94');
INSERT INTO `n_area` VALUES ('96', '保定市', '94');
INSERT INTO `n_area` VALUES ('97', '邯郸市', '94');
INSERT INTO `n_area` VALUES ('98', '张家口市', '94');
INSERT INTO `n_area` VALUES ('99', '秦皇岛市', '94');
INSERT INTO `n_area` VALUES ('100', '邢台市', '94');
INSERT INTO `n_area` VALUES ('101', '唐山市', '94');
INSERT INTO `n_area` VALUES ('102', '承德市', '94');
INSERT INTO `n_area` VALUES ('103', '镇江市', '31');
INSERT INTO `n_area` VALUES ('104', '绍兴市', '30');
INSERT INTO `n_area` VALUES ('105', '嘉兴市', '30');
INSERT INTO `n_area` VALUES ('106', '南通市', '31');
INSERT INTO `n_area` VALUES ('107', '扬州市', '31');
INSERT INTO `n_area` VALUES ('108', '连云港市', '31');
INSERT INTO `n_area` VALUES ('109', '北海市', '33');
INSERT INTO `n_area` VALUES ('110', '九江市', '34');
INSERT INTO `n_area` VALUES ('111', '景德镇市', '34');
INSERT INTO `n_area` VALUES ('112', '淄博市', '35');
INSERT INTO `n_area` VALUES ('113', '烟台市', '35');
INSERT INTO `n_area` VALUES ('114', '潍坊市', '35');
INSERT INTO `n_area` VALUES ('115', '威海市', '35');
INSERT INTO `n_area` VALUES ('116', '岳阳市', '36');
INSERT INTO `n_area` VALUES ('117', '湘潭市', '36');
INSERT INTO `n_area` VALUES ('118', '株洲市', '36');
INSERT INTO `n_area` VALUES ('119', '衡阳市', '36');
INSERT INTO `n_area` VALUES ('120', '常德市', '36');
INSERT INTO `n_area` VALUES ('121', '滁州市', '37');
INSERT INTO `n_area` VALUES ('123', '安庆市', '37');
INSERT INTO `n_area` VALUES ('124', '遵义市', '38');
INSERT INTO `n_area` VALUES ('125', '安顺市', '38');
INSERT INTO `n_area` VALUES ('126', '六盘水市', '38');
INSERT INTO `n_area` VALUES ('127', '沈阳市', '40');
INSERT INTO `n_area` VALUES ('128', '鞍山市', '40');
INSERT INTO `n_area` VALUES ('129', '攀枝花市', '41');
INSERT INTO `n_area` VALUES ('130', '南充市', '41');
INSERT INTO `n_area` VALUES ('131', '襄樊市', '42');
INSERT INTO `n_area` VALUES ('132', '黄石市', '42');
INSERT INTO `n_area` VALUES ('133', '汉中市', '43');
INSERT INTO `n_area` VALUES ('134', '洛阳市', '44');
INSERT INTO `n_area` VALUES ('135', '开封市', '44');
INSERT INTO `n_area` VALUES ('136', '云南省', '0');
INSERT INTO `n_area` VALUES ('137', '昆明市', '136');
INSERT INTO `n_area` VALUES ('138', '丽江市', '136');
INSERT INTO `n_area` VALUES ('139', '蚌埠市', '37');
INSERT INTO `n_area` VALUES ('140', '南山区', '3');
INSERT INTO `n_area` VALUES ('141', '其它区', '3');
INSERT INTO `n_area` VALUES ('143', '市北区', '67');
INSERT INTO `n_area` VALUES ('213', '西藏', '0');
INSERT INTO `n_area` VALUES ('178', '甘肃省', '0');
INSERT INTO `n_area` VALUES ('179', '兰州市', '178');
INSERT INTO `n_area` VALUES ('180', '内蒙古', '0');
INSERT INTO `n_area` VALUES ('181', '呼和浩特', '180');
INSERT INTO `n_area` VALUES ('182', '吉林省', '0');
INSERT INTO `n_area` VALUES ('183', '新疆省', '0');
INSERT INTO `n_area` VALUES ('184', '新疆', '183');
INSERT INTO `n_area` VALUES ('185', '吉林市', '182');
INSERT INTO `n_area` VALUES ('215', '其他地区', '213');
INSERT INTO `n_area` VALUES ('187', '其他地区', '1');
INSERT INTO `n_area` VALUES ('188', '其他地区', '30');
INSERT INTO `n_area` VALUES ('189', '其他地区', '31');
INSERT INTO `n_area` VALUES ('190', '其他地区', '32');
INSERT INTO `n_area` VALUES ('191', '其他地区', '33');
INSERT INTO `n_area` VALUES ('192', '其他地区', '34');
INSERT INTO `n_area` VALUES ('193', '其他地区', '35');
INSERT INTO `n_area` VALUES ('194', '其他地区', '36');
INSERT INTO `n_area` VALUES ('195', '其他地区', '37');
INSERT INTO `n_area` VALUES ('196', '其他地区', '38');
INSERT INTO `n_area` VALUES ('197', '其他地区', '39');
INSERT INTO `n_area` VALUES ('198', '其他地区', '40');
INSERT INTO `n_area` VALUES ('199', '其他地区', '41');
INSERT INTO `n_area` VALUES ('200', '其他地区', '42');
INSERT INTO `n_area` VALUES ('201', '其他地区', '43');
INSERT INTO `n_area` VALUES ('202', '其他地区', '44');
INSERT INTO `n_area` VALUES ('203', '其他地区', '94');
INSERT INTO `n_area` VALUES ('204', '其他地区', '136');
INSERT INTO `n_area` VALUES ('205', '其他地区', '178');
INSERT INTO `n_area` VALUES ('206', '其他地区', '180');
INSERT INTO `n_area` VALUES ('207', '其他地区', '182');
INSERT INTO `n_area` VALUES ('214', '拉萨', '213');
INSERT INTO `n_area` VALUES ('210', '其他地区', '45');
INSERT INTO `n_area` VALUES ('211', '其他地区', '46');
INSERT INTO `n_area` VALUES ('212', '其他地区', '86');
INSERT INTO `n_area` VALUES ('220', '新三区', '184');
INSERT INTO `n_area` VALUES ('219', '新二区', '184');
INSERT INTO `n_area` VALUES ('221', '天河区', '4');
INSERT INTO `n_area` VALUES ('222', '越秀区', '4');
INSERT INTO `n_area` VALUES ('223', '海珠区', '4');

 

 

附件中有相应的jar包

json-lib-2.1-jdk15.jar 是主要的