Spring MVC4设置使用fastjson作为json解析器，替代jackson

引用

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，官网：www.fhadmin.org只需要简单配置： 
<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> 
然后引入fastjson的包就好了。 

附Spring MVC4示例配置文件： 
<?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>