从GWT到Spring MVC控制器的JSON消息发布

Question

我想从GWT发布JSON消息到Spring MVC框架中的控制器。 spring控制器正在接收来自GWT的请求，但是当我输出请求内容长度和request.toString（）时，它显示内容长度为0，并且request.toString（）的输出没有任何内容。

以下是我的代码和输出：

以下是执行JSON消息的发布我的GWT代码：从上面的代码

@UiHandler("saveButton") 
void onClick(ClickEvent e) { 

    UserAddJSO jso = (UserAddJSO)JavaScriptObject.createObject().cast(); 
    jso.setFirstName("Alex"); 
    jso.setLastName("Cheng"); 

    RequestBuilder builder = new RequestBuilder(RequestBuilder.POST, "addUser.aj"); 
    builder.setHeader("Content-Type", "application/json"); 
    builder.setRequestData(new JSONObject(jso).toString()); 
    System.out.println("request data :"+builder.getRequestData()); 

    try 
    { 
     builder.sendRequest(null, new RequestCallback() 
     { 
      public void onError(Request request, Throwable exception) 
      { 
       Window.alert("on error"); 
      } 
      public void onResponseReceived(Request request, Response response) 
      { 
       Window.alert("response received :"+response.getStatusCode()); 
       Window.alert(response.getText()); 
      } 
     }); 
    } 
    catch (RequestException excp) 
    { 
     Window.alert("exception catched"); 
    } 
} 

你可以看到我有一个打印在请求数据中，json字符串在那里。

存在以下是我的春天控制器：

@RequestMapping(value = "**/addUser.aj", method = RequestMethod.POST, produces = "application/json") 
@ResponseBody 
public List<UserAddDTO> getPostStocks(HttpServletRequest request, HttpServletResponse response) throws IOException 
{ 
    List<UserAddDTO> userDTO = new ArrayList<UserAddDTO>(); 

    JSONObject jObj; 
    jObj = new JSONObject(request.getParameterMap()); 
    System.out.println(jObj.toString()); 
    System.out.println("xxxxxxxxxxxxx "+request.toString()); 
    System.out.println("content type :"+request.getContentType()); 
    System.out.println("inside post method"); 

    return userDTO; 
} 

以下是从上面打印出来的输出：从上面的输出可以看到JSON消息

request data :{"firstName":"Alex", "lastName":"Cheng"} 
content type :application/json 
content length :0 
inside post method 
{} 
xxxxxxxxxxxxx POST /addUser.aj HTTP/1.1 
Accept: */* 
Referer: http://127.0.0.1:8888/AlliumApp.html?gwt.codesvr=127.0.0.1:9997 
Accept-Language: en-us 
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; OfficeLiveConnector.1.3; OfficeLivePatch.0.0; Tablet PC 2.0; BRI/2) 
Accept-Encoding: gzip, deflate 
Host: 127.0.0.1:8888 
Connection: Keep-Alive 
Content-Type: application/json 
Content-Length: 0 
Cache-Control: no-cache 

有内请求。但是当它到达控制器时，JSON消息不再存在。那么我是否正确地使用json消息发布和接收的方式？

Answer 1

试试这个：

POST方法

builder.setRequestData("jsonParam=" + new JSONObject(jso).toString()); 

控制器：

@RequestMapping(value = "**/addUser.aj", method = RequestMethod.POST, produces =  "application/json") 
@ResponseBody 
public List<UserAddDTO> getPostStocks(HttpServletRequest request, HttpServletResponse response, @RequestParam("jsonParam") String jsonParam) { 
    ... 
    JSONObject jObj; 
    jObj = new JSONObject(jsonParam); 
} 

GET方法：

RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, 
           "addUser.aj?jsonParam=" + new JSONObject(jso).toString()); 

和控制器：

@RequestMapping(value = "**/addUser.aj", method = RequestMethod.GET, produces = "application/json") 
@ResponseBody 
public List<UserAddDTO> getPostStocks(HttpServletRequest request, HttpServletResponse response, @RequestParam("jsonParam") String jsonParam) { 
    ... 
    JSONObject jObj; 
    jObj = new JSONObject(jsonParam); 
}