java - 如何在java中处理嵌套在数组中的JSON数组

Question

这里是一个java类CreateDoc，它从作为生产者端的一个Web服务发送到另一个作为消费者端的Web服务，作为带有content-type:Json

的列表

下面是类表示

class CreateDoc{
     DocMetData dMetaData;
     DocContent dCont;
}

Class DocMetData {
     String docNamel
     String docType;
}

Class DocContent {
     String data;
}

一旦我在消费者端收到 json 形式的列表，我就无法将其用作 java 对象，并且内容类型是数组，其中 json 嵌套在数组中。

下面是表示:

[  
   [  
      {  
         "dMetaData":{  
            "docName":"string",
            "docType":"pdf"
         },
         "dCont":{  
            "data":"abc"
         }
      },
      {  
         "dMetaData":{  
            "docName":"string",
            "docType":"pdf"

         },
         "dCont":{  
            "data":"def"
         }
      },
      {  
         "dMetaData":{  
            "docName":"string",
            "docType":"pdf"

         },
         "dCont":{  
            "data":"ghk"
         }
      }
   ]
]

问题是如何处理这个问题并能够使用数据并表示为列表。

Answer 1

这里有一些示例代码，展示了如何使用 Jackson ObjectMapper 来解析数据。请注意，代码假设数据存储在文件中，您可以根据需要对其进行修改以满足您的需求。

这是主类:

package parsing.arrayofarray;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class ArrayOfArray {

    public static void main(String[] args) {
        ObjectMapper mapper = new ObjectMapper();
        String data = null;
        try {
            data = new String(Files.readAllBytes(Paths.get("src/main/resources/jsonArrayOfArray.json")));
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        List<List<CreateDoc>> results = null;

        try {
            results = mapper.readValue(data, new TypeReference<List<List<CreateDoc>>>(){});
        } catch (JsonParseException e) {
            e.printStackTrace();
        } catch (JsonMappingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println(results);
    }

}

这里是支持类，首先是 CreateDoc:

package parsing.arrayofarray;

public class CreateDoc {
    DocMetData dMetaData;
    DocContent dCont;
    public DocMetData getdMetaData() {
        return dMetaData;
    }
    public void setdMetaData(DocMetData dMetaData) {
        this.dMetaData = dMetaData;
    }
    public DocContent getdCont() {
        return dCont;
    }
    public void setdCont(DocContent dCont) {
        this.dCont = dCont;
    }
    @Override
    public String toString() {
        return "CreateDoc [dMetaData=" + dMetaData + ", dCont=" + dCont + "]";
    }
}

和文档内容:

package parsing.arrayofarray;

public class DocContent {
    @Override
    public String toString() {
        return "DocContent [data=" + data + "]";
    }

    String data;

    public String getData() {
        return data;
    }

    public void setData(String data) {
        this.data = data;
    }
}

和 DocMetData:

package parsing.arrayofarray;

public class DocMetData {
    String docName;
    String docType;
    public String getDocNamel() {
        return docName;
    }
    public void setDocName(String docName) {
        this.docName = docName;
    }
    @Override
    public String toString() {
        return "DocMetData [docNamel=" + docName + ", docType=" + docType + "]";
    }
    public String getDocType() {
        return docType;
    }
    public void setDocType(String docType) {
        this.docType = docType;
    }
}

println 的输出是:

[[CreateDoc [dMetaData=DocMetData [docNamel=string, docType=pdf], dCont=DocContent [data=abc]], CreateDoc [dMetaData=DocMetData [docNamel=string, docType=pdf], dCont=DocContent [data=def]], CreateDoc [dMetaData=DocMetData [docNamel=string, docType=pdf], dCont=DocContent [data=ghk]]]]