Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling 返回""

ObjectMapper objectMapper = new ObjectMapper();

objectMapper.registerModule(new JavaTimeModule()); // 支持 java.time
objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS); // 禁止时间戳
objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
json = objectMapper.writeValueAsString(demandSettlement);