Ajax实现省市区三级级联(数据来自mysql数据库)
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2022-05-14 21:01:57
实现ajax实现省市区三级级联,需要java解析json技术
整体demo下载地址如下: 点我下载
address.html
实现ajax实现省市区三级级联,需要java解析json技术
整体demo下载地址如下: 点我下载
address.html
<!doctype html> <html> <head> <meta charset="utf-8"> <title>insert title here</title> </head> <script type="text/javascript"> /** * 得到xmlhttprequest对象 */ function getajaxhttp() { var xmlhttp; try { // firefox, opera 8.0+, safari xmlhttp = new xmlhttprequest(); } catch (e) { // internet explorer try { xmlhttp = new activexobject("msxml2.xmlhttp"); } catch (e) { try { xmlhttp = new activexobject("microsoft.xmlhttp"); } catch (e) { alert("您的浏览器不支持ajax!"); return false; } } } return xmlhttp; } /** * 发送ajax请求 * url--请求到服务器的url * methodtype(post/get) * con (true(异步)|false(同步)) * functionname(回调方法名,不需要引号,这里只有成功的时候才调用) * (注意:这方法有二个参数,一个就是xmlhttp,一个就是要处理的对象) */ function ajaxrequest(url, methodtype, con, functionname) { //获取xmlhttprequest对象 var xmlhttp = getajaxhttp(); //设置回调函数(响应的时候调用的函数) xmlhttp.onreadystatechange = function() { //这个函数中的代码在什么时候被xmlhttprequest对象调用? //当服务器响应时,xmlhttprequest对象会自动调用该回调方法 if (xmlhttp.readystate == 4) { if (xmlhttp.status == 200) { functionname(xmlhttp.responsetext); } } }; //创建请求 xmlhttp.open(methodtype, url, con); //发送请求 xmlhttp.send(); } window.onload=function(){ ajaxrequest("addressserlvet?method=provincial","post",true,addrresponse); } //动态获取省的信息 function addrresponse(responsecontents){ var jsonobj = new function("return" + responsecontents)(); for(var i = 0; i < jsonobj.addrlist.length;i++){ document.getelementbyid('select').innerhtml += "<option value='"+jsonobj.addrlist[i].id+"'>" +jsonobj.addrlist[i].address+ "</option>" } } //选中省后 function pchange(){ //先将市的之前的信息清除 document.getelementbyid('selectcity').innerhtml="<option value='-1'>请选择市</option>"; //再将区的信息清除 document.getelementbyid('selectarea').innerhtml="<option value='-1'>请选择区</option>"; //再将用户的输入清楚 document.getelementbyid("addr").innerhtml=""; var val = document.getelementbyid('select').value; if(val == -1){ document.getelementbyid('selectcity')[0].selected = true; return; } //开始执行获取市 ajaxrequest("addressserlvet?method=city&provincial="+val,"post",true,cityresponse); } //获取市的动态数据 function cityresponse(responsecontents){ var jsonobj = new function("return" + responsecontents)(); for(var i = 0; i < jsonobj.citylist.length;i++){ document.getelementbyid('selectcity').innerhtml += "<option value='"+jsonobj.citylist[i].id+"'>" +jsonobj.citylist[i].address+ "</option>" } } //选中市以后 function cchange(){ var val = document.getelementbyid('selectcity').value; //开始执行获取区 ajaxrequest("addressserlvet?method=area&cityid="+val,"post",true,arearesponse); } //获取区的动态数据 function arearesponse(responsecontents){ var jsonobj = new function("return" + responsecontents)(); for(var i = 0; i < jsonobj.arealist.length;i++){ document.getelementbyid('selectarea').innerhtml += "<option value='"+jsonobj.arealist[i].id+"'>" +jsonobj.arealist[i].address+ "</option>" } } //点击提交按钮 function confirm(){ //获取省的文本值 var p = document.getelementbyid("select"); var ptex = p.options[p.options.selectedindex].text; if(p.value=-1){ alert("请选择省"); return; } //获取市的文本值 var city = document.getelementbyid("selectcity"); var citytex = city.options[city.options.selectedindex].text; if(city.value=-1){ alert("请选择市"); return; } //获取区的文本值 var area = document.getelementbyid("selectarea"); var areatex = area.options[area.options.selectedindex].text; if(area.value=-1){ alert("请选择区"); return; } //获取具体位置id文本值 var addr = document.getelementbyid("addr").value; //打印 document.getelementbyid("show").innerhtml = "您选择的地址为 " + ptex + " " + citytex + " " + areatex + " " + addr; } </script> <body> <select id="select" onchange="pchange()"> <option value="-1">请选择省</option> </select> <select id="selectcity" onchange="cchange()"> <option value='-1'>请选择市</option> </select> <select id="selectarea" onchange="achange()"> <option value='-1'>请选择市</option> </select> <input type="text" id="addr" /> <button onclick="confirm();">确定</button> <div id="show"></div> </body> </html>
addressservlet.java
package cn.bestchance.servlet; import java.io.ioexception; import java.util.arraylist; import javax.servlet.servletexception; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import cn.bestchance.dao.addressdao; import cn.bestchance.dao.impl.addressdaoimpl; import cn.bestchance.entity.address; import net.sf.json.jsonarray; import net.sf.json.jsonobject; @webservlet("/addressserlvet") public class addressserlvet extends httpservlet { private static final long serialversionuid = 1l; private addressdao dao = new addressdaoimpl(); protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { dopost(request, response); } /** * @see httpservlet#dopost(httpservletrequest request, httpservletresponse * response) */ protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { response.setcharacterencoding("utf-8"); response.setcontenttype("text/html;charset=utf-8"); string method=request.getparameter("method"); if("provincial".equals(method)){ getprovincial(request, response); } if("city".equals(method)){ getcity(request, response); } if("area".equals(method)){ getarea(request, response); } } /** * 根据市id获取该市下的区的全部信息 * @param request * @param response * @throws servletexception * @throws ioexception */ protected void getarea(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { string cityid = request.getparameter("cityid"); // 从数据库中查询省的信息 arraylist<address> arealist = dao.getareabycityid(integer.parseint(cityid)); // 将集合转成json字符串 jsonobject jsonobj = new jsonobject(); jsonarray jsonarray = jsonarray.fromobject(arealist); jsonobj.put("arealist", jsonarray); string jsondatastr = jsonobj.tostring(); response.getwriter().print(jsondatastr); } /** * 获取省的信息 并相应 * @param request * @param response * @throws servletexception * @throws ioexception */ protected void getprovincial(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { // 从数据库中查询省的信息 arraylist<address> addrlist = dao.getprovince(); // 将集合转成json字符串 jsonobject jsonobj = new jsonobject(); jsonarray jsonarray = jsonarray.fromobject(addrlist); jsonobj.put("addrlist", jsonarray); string jsondatastr = jsonobj.tostring(); response.getwriter().print(jsondatastr); } /** * 获取市的信息并相应 * @param request * @param response * @throws servletexception * @throws ioexception */ protected void getcity(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { string provinceid = request.getparameter("provincial"); // 从数据库中查询省的信息 arraylist<address> addrlist = dao.getcitybyprovinceid(integer.parseint(provinceid)); // 将集合转成json字符串 jsonobject jsonobj = new jsonobject(); jsonarray jsonarray = jsonarray.fromobject(addrlist); jsonobj.put("citylist", jsonarray); string jsondatastr = jsonobj.tostring(); response.getwriter().print(jsondatastr); } }
addressdao.java
package cn.bestchance.dao; import java.util.arraylist; import cn.bestchance.entity.address; public interface addressdao { /** * 获取省的id和名称 * @return */ arraylist<address> getprovince(); /** * 根据省的id获取市的信息 * @param provinceid * @return */ arraylist<address> getcitybyprovinceid(int provinceid); /** * 根据市的id获取区的信息 * @param cityid * @return */ arraylist<address> getareabycityid(int cityid); }
addressdaoimpl.java
package cn.bestchance.dao.impl; import java.sql.resultset; import java.sql.sqlexception; import java.util.arraylist; import cn.bestchance.dao.addressdao; import cn.bestchance.entity.address; import cn.bestchance.util.dbutil; public class addressdaoimpl implements addressdao { private dbutil db = new dbutil(); @override public arraylist<address> getprovince() { arraylist<address> addrlist = new arraylist<address>(); db.openconnection(); string sql = "select * from province"; resultset rs = db.excutequery(sql); try { while(rs.next()){ address addr = new address(); addr.setid(rs.getint(2)); addr.setaddress(rs.getstring(3)); addrlist.add(addr); } } catch (sqlexception e) { // todo auto-generated catch block e.printstacktrace(); }finally{ if(rs != null){ try { rs.close(); } catch (sqlexception e) { // todo auto-generated catch block e.printstacktrace(); } } db.closeresoure(); } return addrlist; } @override public arraylist<address> getcitybyprovinceid(int provinceid) { arraylist<address> addrlist = new arraylist<address>(); db.openconnection(); string sql = "select * from city where fatherid = " + provinceid; //431200 resultset rs = db.excutequery(sql); try { while(rs.next()){ address addr = new address(); addr.setid(rs.getint(2)); addr.setaddress(rs.getstring(3)); addrlist.add(addr); } } catch (sqlexception e) { // todo auto-generated catch block e.printstacktrace(); }finally{ if(rs != null){ try { rs.close(); } catch (sqlexception e) { // todo auto-generated catch block e.printstacktrace(); } } db.closeresoure(); } return addrlist; } @override public arraylist<address> getareabycityid(int cityid) { arraylist<address> addrlist = new arraylist<address>(); db.openconnection(); string sql = "select * from area where fatherid = " + cityid; //431200 resultset rs = db.excutequery(sql); try { while(rs.next()){ address addr = new address(); addr.setid(rs.getint(2)); addr.setaddress(rs.getstring(3)); addrlist.add(addr); } } catch (sqlexception e) { // todo auto-generated catch block e.printstacktrace(); }finally{ if(rs != null){ try { rs.close(); } catch (sqlexception e) { // todo auto-generated catch block e.printstacktrace(); } } db.closeresoure(); } return addrlist; } }
实体类address.java
package cn.bestchance.entity; public class address { @override public string tostring() { return "address [id=" + id + ", address=" + address + "]"; } private int id; private string address; public int getid() { return id; } public void setid(int id) { this.id = id; } public string getaddress() { return address; } public void setaddress(string address) { this.address = address; } public address() { super(); // todo auto-generated constructor stub } public address(int id, string address) { super(); this.id = id; this.address = address; } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
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