返回Task <IHttpActionResult>方法的JSON错误消息-Java 学习之路

我创建了一个ASP.NET Web API，它将调用java Web服务并在JSON中显示一些结果 . 当java Web服务未运行时，我收到错误消息：

{“Message”：“发生错误 . ”，“ExceptionMessage”：“方法或操作未实现 . ”，“ExceptionType”：“System.NotImplementedException”，“StackTrace”：“at ApiClientJavaWebService.Models.RestfulClient C：\ Users \ attsuap1 \ Desktop \ Server Project \ ApiClientJavaWebService \ ApiClientJavaWebService \ Models \ RestfulClient.cs中的.InternalServerError（异常异常）：在C中的ApiClientJavaWebService.Models.RestfulClient.d__3.MoveNext（）中的第43行\ r \ n： \ Users \ attsuap1 \ Desktop \ Server Project \ ApiClientJavaWebService \ ApiClientJavaWebService \ Models \ RestfulClient.cs：line 36 \ r \ n ---从抛出异常的上一个位置的堆栈跟踪结束--- \ r \ n在System处 . System.Runtime.CompilerServices.TaskAwaiter上的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）\ r \ n中的Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）\ r \ n 1.GetResult（）\ r \ n在C：\ Users \ attsuap1 \ D中的ApiClientJavaWebService.Controllers.AdditionController.d__1.MoveNext（） esktop \ Server Project \ ApiClientJavaWebService \ ApiClientJavaWebService \ Controllers \ AdditionController.cs：第20行\ r \ n ---从抛出异常的上一个位置开始的堆栈跟踪结束--- \ r \ n在System.Runtime.CompilerServices.TaskAwaiter .ThrowForNonSuccess（任务任务）\ r \ n在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）\ r \ n在System.Threading.Tasks.TaskHelpersExtensions.d__3`1.MoveNext（）\ r \ n-- - 从抛出异常的先前位置开始的堆栈跟踪结束---在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）\ r \ n处于System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）的\ r \ n ）\ r \ n在System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext（）\ r \ n ---从抛出异常的上一个位置的堆栈跟踪结束--- \ r \ n在System.Runtime System.Runtime.CompilerServices.TaskAwaiter.Ha上的.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）\ r \ n System.Web.Http.Controllers.ActionFilterResult.d__2.MoveNext（）\ r \ n中的ndleNonSuccessAndDebuggerNotification（任务任务）\ r \ n \ n ---从抛出异常的上一个位置开始的堆栈跟踪结束--- \ r \ n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）\ r \ n在System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）\ r \ n （）“}

如何更改此设置以使错误消息显示为 {"The server is not running."} ？

Here are my codes:

AdditionClient.cs

public class RestfulClient
{
    private static HttpClient client;
    private static string BASE_URL = "http://localhost:8080/";

    static RestfulClient()
    {
        client = new HttpClient();
        client.BaseAddress = new Uri(BASE_URL);
        client.DefaultRequestHeaders.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));
    }

    public async Task<string> addition(int firstNumber, int secondNumber)
    {

        try
        {
            var endpoint = string.Format("addition/{0}/{1}", firstNumber, secondNumber);
            var response = await client.GetAsync(endpoint);
            return await response.Content.ReadAsStringAsync();
        }

        catch (Exception e)
        {

        }

        return null;
    }
}

AdditionController.cs

public class AdditionController : ApiController
{
    private RestfulClient restfulClient = new RestfulClient();
    public async Task<IHttpActionResult> Get(int firstNumber, int secondNumber)
    {
        var result = await restfulClient.addition(firstNumber, secondNumber);
        var resultDTO = JsonConvert.DeserializeObject<Temp>(result);
        return Json(resultDTO);
    }
}

有人请帮帮我 . 非常感谢你提前 .

2 回答

我认为，您无法在要提取数据的服务器中管理抛出异常消息 . 那么，你为什么不过滤异常;

try
        {
            var endpoint = string.Format("addition/{0}/{1}", firstNumber, secondNumber);
            var response = await client.GetAsync(endpoint);
            return await response.Content.ReadAsStringAsync();
        }

        catch (Exception e)
        {
            if (e.InnerException.Message == "The method or operation is not implemented")
            {
                //Do something
            }
        }

回复于 2024-05-05T07:29:32+08:00

我已经实现了我想要的 . 我意识到try catch方法应该在控制器类而不是AdditionClient.cs类中 .

这是我编辑的课程：

AdditionClient.cs

public class RestfulClient
{
    private static HttpClient client;
    private static string BASE_URL = "http://localhost:8080/";

    static RestfulClient()
    {
        client = new HttpClient();
        client.BaseAddress = new Uri(BASE_URL);
        client.DefaultRequestHeaders.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));
    }

    public async Task<string> addition(int firstNumber, int secondNumber)
    {
            var endpoint = string.Format("addition/{0}/{1}", firstNumber, secondNumber);
            var response = await client.GetAsync(endpoint);
            return await response.Content.ReadAsStringAsync();
     } 
}

AdditionController.cs (Focusing on try catch part)

try
        {
            var result = await restfulClient.addition(firstNumber, secondNumber);
            var resultDTO = JsonConvert.DeserializeObject<Temp>(result);
            return Json(resultDTO);
        }

        catch (Exception e)
        {
            var result = @"Server is down";
            return Ok(new { ErrorMessage = result });
        }

当服务器未运行时，将在浏览器上显示的结果为 {"ErrorMessage":"Server is down"} .

回复于 2024-05-05T07:29:32+08:00

返回Task <IHttpActionResult>方法的JSON错误消息

2 回答

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