SpringMVC学习之JSON和全局异常处理详解

<!-- springmvc提供的简单异常处理器 -->
   <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
       <!-- 定义默认的异常处理页面 -->
       <property name="defaultErrorView" value="error"/>
       <!-- 定义异常处理页面用来获取异常信息的变量名，也可不定义，默认名为exception --> 
       <property name="exceptionAttribute" value="ex"/>
       <!-- 定义需要特殊处理的异常，这是重要点 --> 
       <property name="exceptionMappings">
           <props>
               <prop key="java.lang.RuntimeException">error</prop>
           </props>
           <!-- 还可以定义其他的自定义异常 -->
       </property>
   </bean> 

@Component
   public class GlobalExceptionHandler implements HandlerExceptionResolver {
 
      @Override
      public ModelAndView resolveException(HttpServletRequest httpServletRequest,
                                         HttpServletResponse httpServletResponse,
                                         Object o, Exception e) {
          ...
      }
   }

@ControllerAdvice
   public class GlobalExceptionResolver {
 
     @ExceptionHandler(value=RuntimeException.class)
     public ModelAndView handler(Exception e){
        ...
     }
   }

   <dependency>
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-databind</artifactId>
     <version>2.9.3</version>
   </dependency>
   <dependency>
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-core</artifactId>
     <version>2.9.3</version>
   </dependency>
   <dependency>
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-annotations</artifactId>
     <version>2.9.3</version>
   </dependency>     

<!--但是，从spring3.1开始DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter的使用已经过时-->
   <!--spring3.1开始我们应该用RequestMappingHandlerMapping来替换DefaultAnnotationHandlerMapping，-->
   <!--spring3.1开始我们应该用用RequestMappingHandlerAdapter来替换AnnotationMethodHandlerAdapter--> 
   <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="mappingJackson2HttpMessageConverter"/>
            </list>
        </property>
   </bean>
   <bean id="mappingJackson2HttpMessageConverter"
          class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <!--处理中文乱码以及避免IE执行AJAX时，返回JSON出现下载文件-->
        <property name="supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
                <value>text/json;charset=UTF-8</value>
                <value>application/json;charset=UTF-8</value>
            </list>
        </property>
   </bean>

@RequestMapping("/loadFwxxToJson")
   @ResponseBody
   public Fwxx loadFwxxToJson(@ModelAttribute Fwxx fwxx) {
     ...
   }