1.替換jar包
2.將配置檔案的3.0 改成4.0
3.jackson也在這裡，要把原來的低版本刪除
4.專案和tomcat要用jdk1.7


5.sevlet檔案裡的
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
 <list>
  <bean
   class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
 </list>
</property>
    </bean>




改成：
<bean id="mappingJackson2HttpMessageConverter" 
        class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">    
        <property name="supportedMediaTypes">    
            <list>    
                <value>application/json;charset=UTF-8</value>    
            </list>    
        </property>    
    </bean>     
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">    
        <property name="messageConverters">    
            <list>    
                <ref bean="mappingJackson2HttpMessageConverter" />
            </list>    
        </property>    
    </bean>