我看了类似的问题,但似乎并没有解决我的问题.我有一个从Feign web服务调用返回的JSON有效载荷,我正在将其映射到POJO。
我有一个JSON有效载荷,它是由Feign网络服务调用返回的,我正在将它映射到POJO。
{
"fields":[
{
"field_one":"one value",
"field_two":"two value",
},
{
"field_one":"one value",
"field_two":"two value",
}
]
}
POJO - 包装器类
@Data
@NoArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL)
public class FieldsResponse {
public List<FieldInfo> fields;
}
POJO - 细节类
@Data
@NoArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL)
public class FieldInfo{
@JsonProperty("field_one")
private String fieldOne;
@JsonProperty("field_two")
private String fieldTwo;
}
POJO没有被填充。如果我把包装器POJO中的项目改为JsonArray,一切都能正常工作(即:我可以正确地看到JSON响应)。我试过在包装对象中初始化列表,也试过用向量代替。
有什么想法吗?
ETA: 如果我删除了 @JsonPropery("field_one") 映射,并将变量从 领域一 到 领域一 那么它的工作。但这不是我想要的工作方式。
下面的代码工作正常。
版本。
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import java.util.List;
import org.junit.jupiter.api.Test;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Data;
import lombok.extern.log4j.Log4j2;
@Log4j2
public class Q62195156 {
// @formatter:off
static final String JSON="{\"fields\":[{\"field_one\":\"one value\",\"field_two\":\"two value\"},{\"field_one\":\"one value\",\"field_two\":\"two value\"}]}";
// @formatter:on
static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
@Test
void test() throws JsonMappingException, JsonProcessingException {
var fieldsResponse = OBJECT_MAPPER.readValue(JSON, FieldsResponse.class);
LOGGER.info("fieldResponse: {}", fieldsResponse);
var fields = fieldsResponse.getFields();
LOGGER.info("fields: {}", fieldsResponse);
assertNotNull(fields, "fields");
var fieldInfo0 = fields.get(0);
LOGGER.info("fieldInfo0: {}", fieldInfo0);
assertNotNull(fieldInfo0, "fieldInfo0");
assertEquals(fieldInfo0.getFieldOne(), "one value", "fieldInfo0.getFieldOne()");
assertEquals(fieldInfo0.getFieldTwo(), "two value", "fieldInfo0.getFieldTwo()");
var fieldInfo1 = fields.get(1);
LOGGER.info("fieldInfo1: {}", fieldInfo1);
assertNotNull(fieldInfo1, "fieldInfo1");
assertEquals(fieldInfo1.getFieldOne(), "one value", "fieldInfo1.getFieldOne()");
assertEquals(fieldInfo1.getFieldTwo(), "two value", "fieldInfo1.getFieldTwo()");
}
@Data
@JsonInclude(JsonInclude.Include.NON_NULL)
static class FieldsResponse {
public List<FieldInfo> fields;
}
@Data
@JsonInclude(JsonInclude.Include.NON_NULL)
static class FieldInfo {
@JsonProperty("field_one")
private String fieldOne;
@JsonProperty("field_two")
private String fieldTwo;
}
}
结果。
13:14:42.344 [main] INFO io.jeffmaxwell.stackoverflow.Q62195156 - fieldResponse: Q62195156.FieldsResponse(fields=[Q62195156.FieldInfo(fieldOne=one value, fieldTwo=two value), Q62195156.FieldInfo(fieldOne=one value, fieldTwo=two value)])
13:14:42.347 [main] INFO io.jeffmaxwell.stackoverflow.Q62195156 - fields: Q62195156.FieldsResponse(fields=[Q62195156.FieldInfo(fieldOne=one value, fieldTwo=two value), Q62195156.FieldInfo(fieldOne=one value, fieldTwo=two value)])
13:14:42.349 [main] INFO io.jeffmaxwell.stackoverflow.Q62195156 - fieldInfo0: Q62195156.FieldInfo(fieldOne=one value, fieldTwo=two value)
13:14:42.351 [main] INFO io.jeffmaxwell.stackoverflow.Q62195156 - fieldInfo1: Q62195156.FieldInfo(fieldOne=one value, fieldTwo=two value)