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。
而
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'}"。