Spring MVC 中 AJAX请求并返回JSON

一、以ModelAndView的方式返回

先看下JavaScript代码：

 /**
  * 保存-同步(版本控制库)
  */
 function saveSynchronizedVcHorse(obj) {
     var ss = $("#SynchronizedSelection div");
     var cacheSelectAry = new Array()
     for(var i = 0; i < ss.length; i ++) {
         //alert(ss.eq(i).html());
         //alert(ss.eq(i).find('label').html());
         var o=ss.eq(i).find('label').find("input[type='checkbox']");

         var s = $(o).attr('checked');//由于$(obj).attr("checked", false); checked属性会被
         if(s != null) {
             cacheSelectAry.push($(o).attr('value'));
         }
     }
     if(cacheSelectAry.length == 0) {
         alert("请选择城市");
         return;
     }
     var json = "SynchronizedBean={\"exceptionId\":\""+exceptionId+"\",\"cityIds\":["
     for(var i = 0; i < cacheSelectAry.length; i ++) {
         if(i == cacheSelectAry.length -1) {
             json = json +"\""+ cacheSelectAry[i] + "\"";
         } else {
             json = json + "\"" + cacheSelectAry[i] + "\",";
         }
     }
     json = json + "]}";
     $.ajax({
            type: "POST",
            dataType: "json",
            url: "../main/saveSynchronizedData",
            data: json,
            success: function(msg){
                alert(msg.main);
            },
            error: function () {//XMLHttpRequest, textStatus, errorThrown
                alert("请求失败");
            }
     });
 }

主要是看ajax请求部分。

再看Spring 中控制器的代码：

 @RequestMapping(value = "/saveSynchronizedData", method = RequestMethod.POST)
     public @ResponseBody ModelAndView saveSynchronizedData(@RequestParam("SynchronizedBean") String mSynchronizedJSON) {
         ObjectMapper objectMapper = new ObjectMapper();
         Map<String, String> map = new HashMap<String, String>();
         try {
             SynchronizedBean bean = objectMapper.readValue(mSynchronizedJSON, SynchronizedBean.class);
             if(bean != null) {
                 String[] ary = bean.getCityIds();
                 if(ary != null && ary.length > 0) {
                     for(String s : ary) {
                         VCHousePo po = new VCHousePo();
                         po.setExceptionId(bean.getExceptionId());
                         po.setCustomerCode(s);
                         po.setCreateTime(new Date());
                         po.setExceptionState(0);
                         vcHService.add(po);
                     }
                 }
             }
             map.put("msg", "success");
         } catch (JsonParseException e) {
             e.printStackTrace();
             map.put("msg", "error");
         } catch (JsonMappingException e) {
             e.printStackTrace();
             map.put("msg", "error");
         } catch (IOException e) {
             e.printStackTrace();
             map.put("msg", "error");
         }
         return new ModelAndView(new MappingJackson2JsonView(),map);
     }

这里是通过ModelAndView的方式进行返回JSON的。另外：MappingJackson2JsonView使用的package是

import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

二、返回String的形式

这种方式不做实验，请查看http://hw1287789687.iteye.com/blog/2128304