Question

我有一个MVC Spring控制器。我在页面加载时将其称为ajax。

$.ajax({
        type:       "get",
        url:        'custom/topic',
        data:       "email1=" + email1 + "&email2=" + email2 ,
        dataType:   "json",
        async:   false,
        success:    function() {
                    alert("successfull!");
        },
        error: function (xhr, desc, error) {
            window.alert('description' + desc);
            window.alert('error' + error);
        }
    });

我的控制器是：

@RequestMapping(value="/topic", method=RequestMethod.GET)
    public String topic(
            @RequestParam("x1") String x1,
            @RequestParam("x2") String x2) {

    String result = custom.topic(x1, x2);

    return "json";

网址是正确的，因为我没有找到消息。我的问题是它总是说解析器错误和无效的jason，并且在无效的jason前面显示整个页面代码。

Answer 1

这是因为您在ajax调用中设置了dataType: "json",并且没有将数据作为json数据发送。

转换此数据时Spring框架将失败，因为这不是json数据。

你可以做两件事（都是独立的），如下所示：

1. Remove `  dataType:   "json",` from ajax call.

如果您真的想要使用JSON数据，请执行以下操作

2. pass the JSON data from client side and create a POJO mappedto JSON on 
   server side. example 

    var data = {};
    data['email1'] = "email1";
    data['email2'] = "email2";

    JSON.stringify(data)

    $.ajax({
        type:"GET",
        contentType: "application/json",
        url: "custom/topic",
        data: JSON.stringify(data),

POJO on server side will have:

    two fields email1 and email2

Answer 2

扩展到上述答案 [tag：'MVC controller - not working']

   Parameters passed in Ajax call are email1 and email2, 
   but you are trying to retrieve x1 and x2.

Answer 3

这是我的家庭控制器链接到动作按钮，应该运作良好。

namespace CampRoll.Controllers
{
public class HomeController : Controller
{
    CampDb db = new CampDb();   // our database conn
    //  
    // GET: /Home/
    public ActionResult Index(string sortOrder)
    {
        ViewBag.PageTitle = "List of Camps (Total " + db.Childs.Count() + " Attending)";
        if (sortOrder == null) sortOrder = "ascNumber";
        ViewBag.numberOrder = (sortOrder == "ascNumber") ? "descNumber" : "ascNumber";
        ViewBag.dateOrder = (sortOrder == "ascDate") ? "descDate" : "ascDate";

        IQueryable<Camp> camps = db.Camps;
        switch (sortOrder)
        {
            case "descDate":
                ViewBag.dateOrder = "ascDate";
                camps = camps.OrderByDescending(c => c.StartDate).Include("Children");
                break;
            case "descNumber":
                ViewBag.numberOrder = "ascNumber";
                camps = camps.OrderByDescending(c => c.Children.Count).Include("Children");
                break;
            case "ascDate":
                ViewBag.dateOrder = "descDate";
                camps = camps.OrderBy(c => c.StartDate).Include(c => c.Children);
                break;
            case "ascNumber":
                ViewBag.numberOrder = "descNumber";
                camps = camps.OrderBy(c => c.Children.Count).Include("Children");
                break;
            default:
                ViewBag.numberOrder = "ascNumber";
                camps = camps.OrderBy(c => c.Children.Count).Include("Children");
                break;
        }
        return View(camps.ToList());
    }

    //
    // GET: /Home/Details/5
    public ActionResult Details(int? id)
    {
        if (id == null)
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        var q = db.Camps.Find(id); // if no worky, q == null
        if (q == null) // find record?
        {
            Debug.WriteLine("Record not found");
            ViewBag.PageTitle = String.Format("Sorry, record {0} not found.", id);
            //return new HttpStatusCodeResult(HttpStatusCode.NotFound);
        }
        else
        {
            ViewBag.PageTitle = "Details of " + q.Title + " (" + ((q.Children.Count == 0) ? "None" : q.Children.Count.ToString()) + ')';
            ViewBag.SexStatsMale = q.Children.Count(chld => chld.Sex == Sex.Male);
            ViewBag.SexStatsFemale = q.Children.Count(chld => chld.Sex == Sex.Female);
        }

        return View(q);
    }

    // Return Partial View of Leader Details
    public PartialViewResult LeaderById(int id)
    {
        return PartialView("_Leader", db.Leaders.Find(id));
    }

    // Return Partial View of Children in a particular Camp
    public PartialViewResult ChildrenById(int id)
    {
        var camp = db.Camps.Find(id);
        @ViewBag.campId = id;
        @ViewBag.campName = camp.Title;
        return PartialView("_ChildrenInCamp", camp.Children);
    }

    //
    // GET: /Home/Create
    [HttpGet]
    public ActionResult Create()
    {
        ViewBag.leadersList = db.Leaders.ToList();
        return View();
    }

    //
    // POST: /Home/Create
    [HttpPost]
    public ActionResult Create(Camp incomingCamp)
    {
        try
        {
            if (ModelState.IsValid)
            {
                using (var db = new CampDb())
                {
                    db.Camps.Add(incomingCamp);
                    db.SaveChanges();
                }
                return RedirectToAction("Index");
            }
            return View();
        }
        catch
        {
            return View();
        }
    }

    //
    // POST: /Home/CreateChild
    [HttpPost]
    public PartialViewResult CreateChild(Child incomingChild)
    {
        if (ModelState.IsValid)
        {
            db.Childs.Add(incomingChild);
            db.SaveChanges();
            return ChildrenById(incomingChild.CampId);
        }
        return null;
    }

    //
    // GET: /Home/Edit/5
    public ActionResult Edit(int id)
    {
        ViewBag.leadersList = db.Leaders.ToList();
        return View(db.Camps.Find(id));
    }

    //
    // POST: /Home/Edit/5
    [HttpPost]
    public ActionResult Edit(Camp editCamp)
    {
        try
        {
            // Modifying State of an entity is more efficient
            // as it avoids a remote call to the database
            db.Entry(editCamp).State = System.Data.Entity.EntityState.Modified;
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        catch
        {
            return View();
        }
    }

    //
    // POST: /Home/UpdateChild/5
    [HttpPost]
    public HttpStatusCodeResult UpdateChild(Child child)
    {
        try
        {
            db.Entry(child).State = System.Data.Entity.EntityState.Modified;
            db.SaveChanges();
            return new HttpStatusCodeResult(HttpStatusCode.OK);
        }
        catch
        {
            return new HttpStatusCodeResult(HttpStatusCode.NotFound);
        }
    }

    //
    // GET: /Home/Delete/5
    public ActionResult Delete(int id)
    {
        return View(db.Camps.Find(id));
    }

    //
    // POST: /Home/Delete/5
    [HttpPost, ActionName("Delete")]
    // This action named 'DeleteConfirmed' to present unique signature
    public ActionResult DeleteConfirmed(int id)
    {
        db.Camps.Remove(db.Camps.Find(id));
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    [HttpPost, ActionName("DeleteChild")]
    // This action named 'DeleteConfirmed' to present unique signature
    public PartialViewResult DeleteChild(int id, int campId)
    {
        db.Childs.Remove(db.Childs.Find(id));
        db.SaveChanges();
        return PartialView("_ChildrenInCamp", db.Camps.Find(campId).Children);
    }
}

}

MVC控制器 - 不工作

3 个答案: