我正在嘗試解析 datas.json 中存在的 JSON 數據。我需要使用 Beans/POJO 類解析排除數據。JSON 數據如下："ExclusionList" : { "serviceLevel" : ["sl1","sl2","sl3"], "item" : ["ABC","XYZ"] } }我為 ExclusionList 創建了 POJO 類，但無法在 ECLIPSE IDE.Mypojo 類的控制臺中獲取和打?。篖ist<String> serviceLevel;List<String> item;//with gettter and setters.我的主要課程如下：public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException, ParseException, JSONException { File jsonFile = new File("C:\\Users\\sameepra\\Videos\\datas.json"); ObjectMapper mapper = new ObjectMapper(); mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false); ExclusionList exclusionlist=mapper.readValue(jsonFile,ExclusionList.class); List<String> excllist=exclusionlist.getServiceLevel(); for (int i = 0; i < excllist.size(); i++) { System.out.println(excllist.get(i)); }}在線程“main”java.lang.NullPointerException中獲取錯誤作為異常
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TA貢獻1806條經驗 獲得超5個贊
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));
}
}
}
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