[英]Converting Map to JSON in Java
我有地图
Map<String, Application.RiskFactor> appRiskFactorsMap = app.getRiskFactors();
它有这样的数据
{risk1=Application.RiskFactor(risk=risk1, question=question1,
factor=true), risk2=Application.RiskFactor(risk=risk2,
question=question2?, factor=true),
risk3=Application.RiskFactor(risk=risk3, question=question3?,
factor=true)}
我正在将其转换为 JSON 并具有此输出。
{"risk1":{"risk":"risk1","question":"question1?","factor":"true"},"":
{"risk":"risk2","question":"question2?","factor":"true"},"risk3":
{"risk":"risk3","question":"question3?","factor":"true"}}
我有这个 JSON 转换器类包 system.referee.util;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
public final class JsonUtils {
private static final ObjectMapper MAPPER = new ObjectMapper();
static {
// Ignore unknown fields while deserialization
MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
// Ignore null & Optional.EMPTY fields while serialization
MAPPER.setSerializationInclusion(JsonInclude.Include.NON_ABSENT);
}
public static <T> String toJson(T obj) {
try {
return MAPPER.writeValueAsString(obj);
} catch (JsonProcessingException e) {
return "";
}
}
public static <T> T fromJson(String json, Class<T> type) {
try {
return MAPPER.readValue(json, type);
} catch (JsonProcessingException e) {
return null;
}
}
}
我想以这种格式打印 JSON
{"risk":"risk1","question":"question1?","factor":"true"},
{"risk":"risk2","question":"question2?","factor":"true"},
{"risk":"risk3","question":"question3?","factor":"true"}
有什么方法可以实现吗? 我无法找到任何帮助。 多谢
您应该忽略键并仅序列化值:
JsonUtils.toJson(appRiskFactorsMap.values())
结果将是一个JSON Array
。
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