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