英文:
Converting Map to JSON in Java
问题
我有一个地图
Map<String, Application.RiskFactor> appRiskFactorsMap = app.getRiskFactors();
它里面有这种数据
{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)}
我将其转换为JSON，并获得此输出。
{"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
package 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 {// 反序列化时忽略未知字段MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);// 序列化时忽略 null 和 Optional.EMPTY 字段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"}
有没有办法实现这样的格式？我无法找到任何关于这个的帮助。非常感谢
英文:
I am having a map
Map<String, Application.RiskFactor> appRiskFactorsMap = app.getRiskFactors();
It has this data kind of in it
{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)}
I am converting it into JSON and having this output.
{"risk1":{"risk":"risk1","question":"question1?","factor":"true"},"":{"risk":"risk2","question":"question2?","factor":"true"},"risk3":{"risk":"risk3","question":"question3?","factor":"true"}}
I have this JSON converter class
package 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 deserializationMAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);// Ignore null & Optional.EMPTY fields while serializationMAPPER.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;}}}
I want to print the JSON in this format
{"risk":"risk1","question":"question1?","factor":"true"},{"risk":"risk2","question":"question2?","factor":"true"},{"risk":"risk3","question":"question3?","factor":"true"}
is there any way to achieve that? I am unable to find any help with this. thanks a lot
答案1
得分: 1
你应该忽略键，只对值进行序列化：
JsonUtils.toJson(appRiskFactorsMap.values())
结果将是一个 JSON 数组。
英文:
You should ignore keys and serialise only values:
JsonUtils.toJson(appRiskFactorsMap.values())
Result will be a JSON Array.
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