Question

我正在尝试解析datas.json中存在的JSON数据。我需要使用Beans / POJO类来解析排除数据.JSON数据如下：
$offset

我为ExclusionList创建了POJO类，但是无法在ECLIPSE IDE的控制台中获取和打印。Mypojo类：

$data

我的主要课程如下：

"ExclusionList" : {
                  "serviceLevel" : ["sl1","sl2","sl3"],
                  "item" : ["ABC","XYZ"]                                                                 }  }

在线程“ main” java.lang.NullPointerException

中获取作为 Exception的错误

Answer 1

You need to wrap your pojo class in another containing an ExclusionList property.
Try this. The examples below uses lombok for getters , setters and default constructor.


import java.util.List;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;

import lombok.Data;

@Data
public class ExclusionListWrapper {

    @JsonProperty("ExclusionList")
    private ExclusionList exclusionList;

    @Data
    class ExclusionList {
        List<String>    serviceLevel;
        List<String>    item;

    }

    public static void main(String[] args) throws Exception {
        String data = "{\"ExclusionList\" : {\"serviceLevel\" : [\"sl1\",\"sl2\",\"sl3\"], \"item\" : [\"ABC\",\"XYZ\"]}}";
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        ExclusionListWrapper exclusionlistWrapper = mapper.readValue(data, ExclusionListWrapper.class);
        List<String> excllist = exclusionlistWrapper.getExclusionList().getServiceLevel();
        for (int i = 0; i < excllist.size(); i++) {
            System.out.println(excllist.get(i));
        }
    }

}

需要解析JAVA中JSON对象内部的JSON ARRAYS

1 个答案: