Spring MVC 中 AJAX请求并返回JSON的示例

/** * 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");       }   });}

@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);  }