為了減少不必要的內容傳輸， 過濾null欄位，可對返回的類加入註釋來解決。

條件：

1.  spring MVC 3.X 支援註解

2. jackson-code.jar,jackson-mapper.jar 通常用jackson-all-xxx.jar 就行了

使用：

在需要序列化為json輸出的類上增加, 例如：

import org.codehaus.jackson.map.annotate.JsonSerialize;
@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
public class XXXX{
}
 

官方說明

@deprecated As of Jackson 2.0, this annotation has been replaced
     *    by {@link com.fasterxml.jackson.annotation.JsonInclude}

改成：

@JsonInclude(Include.NON_NULL)
public class XXXX{
}

如果要全域性配置可參考：

<mvc:message-converters register-defaults="true">
			<bean
				class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
				<property name="prefixJson" value="false" />
				<property name="supportedMediaTypes" value="application/json" />
				<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>
	    <!-- 強化引數接收 -->
		<mvc:argument-resolvers>
			<bean class="org.durcframework.common.form.FormModelMethodArgumentResolver" />
		</mvc:argument-resolvers>
		 
        <mvc:message-converters>  
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">  
                <property name="objectMapper">  
                    <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                    	<!-- 處理responseBody 裡面日期型別 -->  
                        <property name="dateFormat">  
                            <bean class="java.text.SimpleDateFormat">  
                                <constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />  
                            </bean>  
                        </property> 
                        <!-- 為null欄位時不顯示 -->
                        <property name="serializationInclusion">
                            <value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
                        </property> 
                    </bean>  
                </property>  
            </bean>  
        </mvc:message-converters>  
	</mvc:annotation-driven>