Question

springMVC,json视图,返回的json数据有null值,怎么过滤成空串

<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
<property name="encoding">
<value type="org.codehaus.jackson.JsonEncoding">UTF8</value>
</property>
<property name="contentType" value="application/json;charset=UTF-8"/>
</bean>

json:
{"s":{"userId":"1","userName":"测试","passWord":"3","list":null,"dep":null,"date":1325347200000},"userForm":{"userId":"1","userName":"测试","passWord":"3","list":null,"dep":null,"date":1325347200000}}

里面有null值，怎么配置，才能让null自动变成空串

Answer 1

自己构建ObjectMapper注入进去，在ObjectMapper中设置NOT_NULL不转换
<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
<property name="extractValueFromSingleKeyModel" value="true" />
<property name="objectMapper">
<bean class="org.codehaus.jackson.map.ObjectMapper">
<property name="serializationInclusion">
<value type="org.codehaus.jackson.map.annotate.JsonSerialize$Inclusion">NON_NULL</value>
</property>
</bean>
</property>
</bean>

Answer 2

string.replaceAll(":null", ":\"\"")
思路是这样，写法细节需调试