不论是性能、易用性、特性支持，fastjson都要远好于默认的jackson，所以如果应用程序经常使用ajax进行数据交互，建议用fastjson作为默认解析器，只需要简单配置：
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<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<property name="supportedMediaTypes" value="application/json"/>
<!--设置fastjson特性-->
<property name="features">
<array>
<!--设置null值也要输出，fastjson默认是关闭的-->
<value>WriteMapNullValue</value>
<!--设置使用文本方式输出日期，fastjson默认是long-->
<value>WriteDateUseDateFormat</value>
</array>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
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然后引入fastjson的包就好了。
附Spring MVC4示例配置文件：
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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
<!--包扫描--><context:component-scan base-package="com.rs" />
<!--数据连接池，此处使用c3p0--><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"destroy-method="close">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://x.x.x.x:3306/test" />
<property name="user" value="USER" />
<property name="password" value="PASS" />
</bean>
<!--配置事务管理器--><bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!--使用fastjson作为json解析器--> <mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<property name="supportedMediaTypes" value="application/json"/>
<property name="features">
<array>
<value>WriteMapNullValue</value>
<value>WriteDateUseDateFormat</value>
</array>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!--注入JdbcTemplate--><bean id="jdbc" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
<!--配置视图--><bean id="jspView" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
<!--配置拦截器--><mvc:interceptors>
<mvc:interceptor>
<!--拦截匹配路径的html和do文件-->
<mvc:mapping path="/*/*.html" />
<mvc:mapping path="/*/*.do" />
<!--放过部分请求-->
<mvc:exclude-mapping path="/home/login.html" />
<mvc:exclude-mapping path="/home/logout.html" />
<!--自定义的拦截器-->
<bean class="com.nids.web.ActionInterceptor" />
</mvc:interceptor>
</mvc:interceptors>
</beans>
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本文转自 BoyTNT 51CTO博客，原文链接：http://blog.51cto.com/boytnt/1771390，如需转载请自行联系原作者