過濾空值：

方法一：springMVC配置檔案中加相關配置：

<mvc:annotation-driven>
    <mvc:message-converters register-defaults="true"> 
	<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper">
                <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                    <property name="serializationInclusion">
                        <value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
                    </property>
                </bean>
            </property>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>
 

方法二：在相關方法上加上註解：@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

過濾空值與轉換日期格式：

<mvc:annotation-driven>
    <mvc:message-converters register-defaults="true"> 
	<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper">
                <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                	<!-- 過濾空值 -->
                    <property name="serializationInclusion">
                        <value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
                    </property>
                    <!-- 預設日期轉換為時間戳，此處配置將日期按指定格式轉換 -->
                    <property name="dateFormat">
                    	<bean class="java.text.SimpleDateFormat">
                    		<constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />
                    	</bean>
                    </property>
                </bean>
            </property>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>