ajax 与springmvc交互返回数据
1.controller将数据封装成json格式返回页面
@RequestMapping("/dataList") public void datalist(CsoftCunstomerPage page,HttpServletResponse response) throws Exception{ List<CsoftCunstomer> dataList = csoftCunstomerService.queryByList(page); //设置页面数据 Map<String,Object> jsonMap = new HashMap<String,Object>(); jsonMap.put("total",page.getPager().getRowCount()); jsonMap.put("rows", dataList); try { //设置页面不缓存 response.setContentType("application/json"); response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setCharacterEncoding("UTF-8"); PrintWriter out= null; out = response.getWriter(); out.print(JSONUtil.toJSONString(jsonMap)); out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } }
2.ajax提交数据以json格式到controller中
例一:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <!--<script type="text/javascript" src="../static/js/jquery-1.7.2.min.js"></script>--> <!--JS的地址可以写成下面这样，将来部署的时候，这些静态文件就可以单独部署了，不依赖于后台路径--> <script type="text/javascript" src="http://localhost:8080/sshdemo/static/js/jquery-1.7.2.min.js"></script> <script type="text/javascript"> $(document).ready(function() { ajaxRequest(); }); function ajaxRequest() { $.ajax({ url: "http://localhost:8080/sshdemo/hello/ajax", type: "POST", dataType: "json", data: { "a": 1, "b": 2, "c": 3 }, async: false, success: function(data) { alert("success"); $.each(data, function(index, element) { alert(element.a); alert(element.b); alert(element.c); }); }, error: function() { alert("error"); } }); } </script> </head> <body> <div>Hello World!</div> </body> </html>
实例二
package com.xbs.ready.ssh.controller; import com.alibaba.fastjson.JSON; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; /** * * @author xbs */ @Controller @RequestMapping("hello") public class HelloController { /** * ajax请求不需要返回页面，只需要得到response中的数据即可，所以方法签名为void即可 * * @param request * @param response */ @RequestMapping(value = "ajax", method = RequestMethod.POST) public void ajaxDatas(HttpServletRequest request, HttpServletResponse response) { String jsonResult = getJSONString(request); renderData(response, jsonResult); } private String getJSONString(HttpServletRequest request) { //故意构造一个数组，使返回的数据为json数组，数据更复杂些 List<Map<String, Object>> datas = new ArrayList<Map<String, Object>>(5); Map<String, Object> map1 = new HashMap<String, Object>(10); //可以获得ajax请求中的参数 map1.put("a", request.getParameter("a")); map1.put("b", request.getParameter("b")); map1.put("c", request.getParameter("c")); datas.add(map1); //故意构造一个数组，使返回的数据为json数组，数据更复杂些 Map<String, Object> map2 = new HashMap<String, Object>(10); map2.put("a", "11"); map2.put("b", "22"); map2.put("c", "33"); datas.add(map2); String jsonResult = JSON.toJSONString(datas); return jsonResult; } /** * 通过PrintWriter将响应数据写入response，ajax可以接受到这个数据 * * @param response * @param data */ private void renderData(HttpServletResponse response, String data) { PrintWriter printWriter = null; try { printWriter = response.getWriter(); printWriter.print(data); } catch (IOException ex) { Logger.getLogger(HelloController.class.getName()).log(Level.SEVERE, null, ex); } finally { if (null != printWriter) { printWriter.flush(); printWriter.close(); } } } }
例二:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <html> <head> <title>helloworld</title> <script type="text/javascript" src="/spring_mvc/js/jquery.js"></script> <script type="text/javascript"> $(function(){ $("#testButton").click(function(){ var $a = $(this); $.ajax({ url:"/spring_mvc/testAjax.do", type:'post', data:'name=admin&password=123456', dataType:'html', success:function(data,status){ if(status == "success"){ var objs = jQuery.parseJSON(data); var str = ""; for(var i=0;i<objs.length;i++){ str = str + objs[i].activityName+" "; } $("#content").html(str); } }, error:function(xhr,textStatus,errorThrown){ } }); }); }); </script> </head> <body> <button id="testButton">异步传输</button> <div id="content"></div> </body> </html>
例三:
@RequestMapping("/dataList") public void datalist(CsoftCunstomerPage page,HttpServletResponse response) throws Exception{ List<CsoftCunstomer> dataList = csoftCunstomerService.queryByList(page); //设置页面数据 Map<String,Object> jsonMap = new HashMap<String,Object>(); jsonMap.put("total",page.getPager().getRowCount()); jsonMap.put("rows", dataList); try { //设置页面不缓存 response.setContentType("application/json"); response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setCharacterEncoding("UTF-8"); PrintWriter out= null; out = response.getWriter(); out.print(JSONUtil.toJSONString(jsonMap)); out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } }
