spring mvc将对象转换为json返回的配置

之前在spring 3中用的好好的MappingJacksonHttpMessageConverter转换器，将对象转为json响应给浏览器，在spring4中，报错。

Cannot create inner bean 'org.springframework.http.converter.json.MappingJackson2HttpMessageConverter#0'

of type [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter] while setting bean

property 'messageConverters' with key [1]; nested exception is org.springframework.beans.factory.BeanCreationException:

Error creating bean with name 'org.springframework.http.converter.json.MappingJackson2HttpMessageConverter#0': Failed to

introspect bean class [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter] for lookup method metadata:

could not find class that it depends on; nested exception is java.lang.NoClassDefFoundError:

com/fasterxml/jackson/core/util/DefaultPrettyPrinter$Indente

解决：

这种错误，是因为 spring4开始，使用了 MappingJackson2HttpMessageConverter替换之气的MappingJacksonHttpMessageConverter，

同时，依赖的jar包也换了。从jackson-mapper-asl，jackson-core-asl,换为了 jackson-core，jackson-databind

springmvc配置文件：

<mvc:annotation-driven>
		<mvc:message-converters>
			<bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <!-- <constructor-arg ref="utf8Charset"/> -->
                 <!-- <property name="supportedMediaTypes" value = "text/plain;charset=UTF-8" /> -->
                 <property name="writeAcceptCharset" value="false" /><!-- 用于避免响应头过大 -->
                 <property name = "supportedMediaTypes">
                    <list>
                        <value>text/plain;charset=UTF-8</value>
                        <value>text/html;charset=UTF-8</value>
<!--                         <value>text/json;charset=UTF-8</value>    -->
                    </list>
                 </property>
            </bean>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                 <property name = "supportedMediaTypes">
                    <list>
                        <value>text/json;charset=UTF-8</value>
                    </list>
                 </property>

            </bean>
		</mvc:message-converters>
	</mvc:annotation-driven>

参考：

springmvc和json整合配置方法

解决spring4.x中的MappingJacksonHttpMessageConverter错误

spring3.X升级到spring4.X时关于MappingJacksonHttpMessageConverter的问题