从此 JSON 对象获取字段的有效方法是什么？

Question

我有以下 returns json 对象的代码。我需要过滤发件人电子邮件、主题和创建日期。该代码完成了这项工作，但我觉得有一种有效的方法可以做到这一点。感谢您的建议。

ResponseEntity<String> response =
                            restTemplate.exchange(app.getResourceUrl() + personnelEmail+
                            MESSAGE+"/?$select=Sender,Subject,CreatedDateTime", HttpMethod.GET, request, String.class);

                    String str=response.getBody();
                    JSONObject jsonObject= new JSONObject(str);
                    JSONArray arrayList= (JSONArray)jsonObject.get("value");

                    List l=arrayList.toList();

                    for(int i=0;i<l.size();i++){
                        HashMap<String,HashMap> hashMap=(HashMap<String,HashMap>)l.get(i);

                        HashMap<String,HashMap> sender= hashMap.get("sender");
                        HashMap<String,String> senderEmail= sender.get("emailAddress");

                        String email= senderEmail.get("address");

                    }

这是我从 MS Office API 收到的 json 对象。

{"@odata.context":"https://graph.microsoft.com/v1.0/$metadata#users('user34.onmicrosoft.com')/messages(sender,subject,createdDateTime)","value":[{"@odata.etag":"W/\”sljkasfdiou7978klosadf\"","id”:"lkjasdfu97978KLJASDFS_WGHJJ76J897DKdcuvtymBTItq836K34PUAAAvoK3SAAA=","createdDateTime":"2016-08-27T04:07:08Z","subject":"View your Office 365 Enterprise E3 billing statement","sender":{"emailAddress":{"name":"Microsoft Online Services Team","address”:"T45763@email.microsoftonline.com"}}},{"@odata.etag":"W/\”JUU70303\"","id”:”UEYO93988FK;O38GV3J884=","createdDateTime":"2016-08-26T15:28:47Z","subject":"Order confirmation: Thank you for your purchase","sender":{"emailAddress":{"name":"Microsoft Online Services Team","address":"obue733@email.microsoftonline.com"}}},{"@odata.etag":"W/\”LJKOIU987983\"","id”:”ladjksflk83l.x8783LKFW3=","createdDateTime":"2016-06-24T03:03:26Z","subject":"Attention: Your Microsoft Azure Active Directory Premium trial subscription will be disabled soon","sender":{"emailAddress":{"name":"Microsoft Online Services Team","address":"635cdeee@email.microsoftonline.com"}}}]}

Answer 1

默认情况下，Office 365 REST API 响应负载还包括常见的 annotations，例如：

odata.context: payload
odata.etag：实体的ETag，视情况而定

下图为证

正如您可能已经猜到的那样，它可以通过 odata.metadata parameter 进行控制：

The odata.metadata parameter can be applied to the Accept header of an OData request to influence how much control information will be included in the response.

示例（C# 版本）

示例演示了如何通过Accept header设置odata.metadata=none格式参数到表示服务应该省略控制信息

using (var client = new HttpClient(handler))
{
     var url = "https://outlook.office365.com/api/v1.0/me/messages?$select=Sender,Subject,DateTimeCreated";
     client.DefaultRequestHeaders.Accept.Add(MediaTypeWithQualityHeaderValue.Parse(GetMediaType("none",false,false)));
     var result = await client.GetStringAsync(url);
     var data = JObject.Parse(result);

     foreach (var item in data["value"])
     {
        //process item;
     }
}

哪里

private static string GetMediaType(string metadata,bool streaming,bool IEEE754Compatible)
{
   return String.Format("application/json; OData.metadata={0}; OData.streaming={1}; IEEE754Compatible={2}",metadata,streaming, IEEE754Compatible);
}

从此 JSON 对象获取字段的有效方法是什么？

What is the efficient way to get the fields from this JSON object?

parsing

json

gson

office365

azure-ad-graph-api