Question

我一直在同一个问题上待了两个星期，因此对您的帮助将不胜感激。

我正在尝试解析API的响应，但是无论尝试如何，都会不断出错。我希望能够解析String并将每个文件提取到对象，以便以后可以在GUI中使用它们并对它们进行分类。

以下是回复示例：

{
    "filings": [
        {
            "id": "fil_ol1QrN",
            "filing_date": {
                "year": 2019,
                "month": 10,
                "day": 9
            },
            "accepted_date": {
                "dateTime": {
                    "date": {
                        "year": 2019,
                        "month": 10,
                        "day": 9
                    },
                    "time": {
                        "hour": 18,
                        "minute": 32,
                        "second": 27,
                        "nano": 0
                    }
                },
                "offset": {
                    "totalSeconds": 0
                }
            },
            "period_end_date": {
                "year": 2019,
                "month": 10,
                "day": 7
            },
            "report_type": "4",
            "sec_unique_id": "0000320193-19-000109",
            "filing_url": "https://www.sec.gov/Archives/edgar/data/320193/000032019319000109/0000320193-19-000109-index.htm",
            "report_url": "https://www.sec.gov/Archives/edgar/data/320193/000032019319000109/xslF345X03/wf-form4_157066032478147.xml"
        },
        {
            "id": "fil_6GoeOv",
            "filing_date": {
                "year": 2019,
                "month": 10,
                "day": 3
            },
            "accepted_date": {
                "dateTime": {
                    "date": {
                        "year": 2019,
                        "month": 10,
                        "day": 3
                    },
                    "time": {
                        "hour": 18,
                        "minute": 31,
                        "second": 27,
                        "nano": 0
                    }
                },
                "offset": {
                    "totalSeconds": 0
                }
            },
            "period_end_date": {
                "year": 2019,
                "month": 10,
                "day": 1
            },
            "report_type": "4",
            "sec_unique_id": "0000320193-19-000106",
            "filing_url": "https://www.sec.gov/Archives/edgar/data/320193/000032019319000106/0000320193-19-000106-index.htm",
            "report_url": "https://www.sec.gov/Archives/edgar/data/320193/000032019319000106/xslF345X03/wf-form4_157014186524822.xml"
        },
        {
            "id": "fil_Vb3JD0",
            "filing_date": {
                "year": 2019,
                "month": 10,
                "day": 3
            },
            "accepted_date": {
                "dateTime": {
                    "date": {
                        "year": 2019,
                        "month": 10,
                        "day": 3
                    },
                    "time": {
                        "hour": 18,
                        "minute": 33,
                        "second": 22,
                        "nano": 0
                    }
                },
                "offset": {
                    "totalSeconds": 0
                }
            },
            "period_end_date": {
                "year": 2019,
                "month": 10,
                "day": 1
            },
            "report_type": "4",
            "sec_unique_id": "0000320193-19-000107",
            "filing_url": "https://www.sec.gov/Archives/edgar/data/320193/000032019319000107/0000320193-19-000107-index.htm",
            "report_url": "https://www.sec.gov/Archives/edgar/data/320193/000032019319000107/xslF345X03/wf-form4_157014197957378.xml"
        }
    ],
    "company": {
        "id": "com_NX6GzO",
        "ticker": "AAPL",
        "name": "Apple Inc",
        "lei": "HWUPKR0MPOU8FGXBT394",
        "cik": "0000320193"
    },
    "next_page": "MjAxOS0xMC0wM3w1NzcwMTQ0"
}

在这种情况下，我将提取3个不同的文件，并尝试提取每个文件的ID和报告类型，以我在另一个类似的SO问题中采用的以下代码开头：

import java.util.HashMap;
import java.util.Map;

public class ExtractSECFilings {

    private Map<String, MyObject> filings = new HashMap<String, MyObject>();

    public Map<String, MyObject> getfilings() {
        return filings;
    }

    public void setFilings(Map<String, MyObject> filings) {
        this.filings = filings;
    }

    @Override
    public String toString() {
        return "filings{" +
                "filings=" + filings +
                '}';
    }
}

class MyObject {
    private String id;
    private String report_type;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getReportType() {
        return report_type;
    }

    public void setReportType(String report_type) {
        this.report_type = report_type;
    }

    @Override
    public String toString() {
        return "MyObject{" +
                "id='" + id + '\'' +
                ", report_type='" + report_type + '\'' +
                '}';
    }


}

现在在主要方法中：

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.reflect.TypeToken;
import com.intrinio.api.*;
import com.intrinio.models.*;

import com.intrinio.invoker.*;
import com.intrinio.invoker.auth.*;

import java.io.BufferedReader;
import java.io.IOException;
import java.net.Proxy.Type;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONObject;

import org.threeten.bp.*;

public class Main {
    public static void main(String[] args) throws JsonGenerationException {

        ApiClient defaultClient = Configuration.getDefaultApiClient();
        ApiKeyAuth auth = (ApiKeyAuth) defaultClient.getAuthentication("ApiKeyAuth");
        auth.setApiKey("INSERT_API_KEY");

        CompanyApi companyApi = new CompanyApi();

        String identifier = "AAPL";
        String reportType = null;
        LocalDate startDate = null; 
        LocalDate endDate = null; 
        Integer pageSize = 3; 
        String nextPage = null;

        try {
            ApiResponseCompanyFilings result = companyApi.getCompanyFilings(identifier, reportType, startDate, endDate,
                    pageSize, nextPage);

            String convertedResult = new Gson().toJson(result);
            System.out.println(convertedResult);

            ObjectMapper mapper = new ObjectMapper();
            ExtractSECFilings readValue = mapper.readValue(convertedResult, ExtractSECFilings.class);
            System.out.println("readValue = " + readValue);

        } catch (ApiException | IOException e) {
            System.err.println("Exception when calling CompanyApi#getCompanyFilings");
            e.printStackTrace();
        }
    }

}

我遇到以下错误：

调用CompanyApi＃getCompanyFilings时发生异常 com.fasterxml.jackson.databind.exc.MismatchedInputException：无法在START_ARRAY中反序列化java.util.LinkedHashMap的实例 [来源：（字符串）“ {” filings“：[{” id“：” fil_ol1QrN“，” filing_date“：{” year“：2019，” month“：10，” day“：9}，” accepted_date“：{” dateTime “：{” date“：{” year“：2019，” month“：10，” day“：9}，” time“：{” hour“：18，” minute“：32，” second“：27， “ nano”：0}}，“ offset”：{“ totalSeconds”：0}}，“ period_end_date”：{“ year”：2019，“ month”：10，“ day”：7}，“ report_type”：“ 4“，” sec_unique_id“：” 0000320193-19-000109“，” filing_url“：” https://www.sec.gov/Archives/edgar/data/320193/000032019319000109/0000320193-19-000109-index.htm“，” report_url“：” https://www.sec.gov/Archives/edgar/da“” [被截断 1342个字符];行：1，列：12]（通过参考链： jsonToObjects.ExtractSECFilings [“ filings”]）

我尝试了许多教程，并不断出错。我是编程的新手，所以再次感谢您的帮助。

Answer 1

它无法将您的pojo属性与json字符串匹配。尝试将private Map<String, MyObject> filings = new HashMap<String, MyObject>();更改为private List<MyObject> filings = new ArrayList<>();

UPD：：如果发生com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException，只需在@JsonIgnoreProperties(ignoreUnknown = true)类上添加ExtractSECFilings注释。

@JsonIgnoreProperties(ignoreUnknown = true)
static class ExtractSECFilings {}

Answer 2

我从上面的json猜测，您正在尝试获取json节点“ id”和“ report_type”

@JsonIgnoreProperties(ignoreUnknown=true)
class Wrapper{


  @JsonProperty(value="filings")
  List<ExtractSECFilings> filings;

  public List<ExtractSECFilings> getFillings() {
    return filings;
  }

  public void setFillings(List<ExtractSECFilings> fillings) {
    this.filings = fillings;
  } 
}

@JsonIgnoreProperties(ignoreUnknown=true)
 class ExtractSECFilings {

 String id;
 String report_type;

public String getId() {
  return id;
}
public void setId(String id) {
  this.id = id;
}
public String getReport_type() {
  return report_type;
}
public void setReport_type(String report_type) {
  this.report_type = report_type;
}
@Override
public String toString() {
  return "ExtractSECFilings [id=" + id + ", report_type=" + report_type + "]";
}
}

//here add this code in  your main application to serialize the json

public class Demo{
public static void main(String args[]){
 Wrapper wrapper=mapper.readValue(val, Wrapper.class);
    System.out.println(wrapper.getFillings());
}
}
```
in the console you can see that id and report type json node values

将Json字符串粘贴到对象

2 个答案: