通过Ajax进行POST提交JSON类型的数据到SpringMVC Controller的方法

现在在做的项目用到了SpringMVC框架,需要从前端angular接收请求的JSON数据,为了测试方便,所以直接先用AJAX进行测试,不过刚开始用平时用的
ajax方法,提交请求会出现415或者400错误,经过研究,终于可以了,现在做个总结。

js代码:

function postSimpleData() {
        $.ajax({
            type: "POST",
            url: "Service/SimpleData",
            contentType: "application/json", //必须有
            dataType: "json", //表示返回值类型,不必须
            data: JSON.stringify({ 'foo': 'foovalue', 'bar': 'barvalue' }),  //相当于 //data: "{'str1':'foovalue', 'str2':'barvalue'}",
            success: function (jsonResult) {
                alert(jsonResult);
            }
        });
    }
    function login(){
    $.ajax({
        url: "Service/login",
        type: "POST",
        contentType: "application/json",
        dataType: "json",
        data: JSON.stringify({
            MachineIP:"127.0.0.1",
            AppTag:"4",
            RequestInfo:{
                StaffCode:"",
                Password:"",
                StaffCard:"01411"
            },
        }),
        async: true,
        success: function(data) {
            var ss = JSON.stringify(data);
            $("#result").val(ss);
            console.log(ss);
        }
    });
    }
    function postEmployees() {
        $.ajax({
            type: "POST",
            url: "Service/Employees",
            contentType: "application/json",
            dataType: "json",
            data: JSON.stringify({                "Employees": [
                                    { "firstName": "Bill", "lastName": "Gates" },
                                    { "firstName": "George", "lastName": "Bush" },
                                    { "firstName": "Thomas", "lastName": "Carter" }
                                 ]

            }),
            success: function (jsonResult) {
                alert(jsonResult);
            }
        });
    }

JAVA Controller代码:

@RequestMapping(value = "/SimpleData", method = RequestMethod.POST)
    @ResponseBody
    public ActionResult SimpleData(string foo, string bar) {
        return Json("SimpleData", JsonRequestBehavior.AllowGet);
    }

    @RequestMapping(value = "/login", method = RequestMethod.POST)
    @ResponseBody
    public ResponseProtocolMap login(@RequestBody JSONObject requestJson, HttpServletRequest request) {
        ResponseProtocolMap responseProtocolMap = null;
        String machineIP = RequestJsonUtils.getMachineIP(requestJson);
        String appTag = RequestJsonUtils.getAppTag(requestJson);
        JSONObject requestInfo = RequestJsonUtils.getRequestInfo(requestJson);
        if (requestInfo == null) {
            responseProtocolMap = new ResponseProtocolMap("-1", "参数错误");
        } else {
            String staffCode = RequestJsonUtils.getValueByKey(requestInfo, "StaffCode");
            String password = RequestJsonUtils.getValueByKey(requestInfo, "Password");
            String staffCard = RequestJsonUtils.getValueByKey(requestInfo, "StaffCard");
            responseProtocolMap = sysLoginService.login(staffCode, password, staffCard, appTag, request);
        }
        return responseProtocolMap;
    }

    @RequestMapping(value = "/Employees", method = RequestMethod.POST)
    @ResponseBody
    public ActionResult Employees(List<Employee> Employees) {
        return Json("Employees", JsonRequestBehavior.AllowGet);
    }





public class Employee{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

值得注意的有2点:

1)Ajax 选项中

contentType: "application/json"

这一条必须写,表明request的数据类型是json。

dataType: "json"

这一条表示返回值的类型,不是必须的,且依据返回值类型而定。

2)选项中

data: JSON.stringify({ 'foo': 'foovalue', 'bar': 'barvalue' })

很多时候我们将数据写作:

{ 'foo': 'foovalue', 'bar': 'barvalue' }

这样会导致错误,因为js会默认将这个json对象放到表单数据中,故而导致controller接收不到。

有两种办法处理:第一种方式是用JSON.stringify()函数,其中JSON被Ecmascript5定义为全局对象。

第二种方式是直接用双引号包裹起来,比如data: “{‘str1’:’foovalue’, ‘str2’:’barvalue’}”。

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