SpringMVC 文件上传&拦截器&异常处理

	<!-- 配置 MultipartResolver -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="UTF-8"></property>
		<property name="maxUploadSize" value="1024000"></property>	
	</bean>

	<form action="testFileUpload" method="POST" enctype="multipart/form-data">
		File: <input type="file" name="file"/>
		Desc: <input type="text" name="desc"/>
		<input type="submit" value="Submit"/>
	</form>

	@RequestMapping("/testFileUpload")
	public String testFileUpload(@RequestParam("desc") String desc, 
			@RequestParam("file") MultipartFile file) throws IOException{
		System.out.println("desc: " + desc);
		System.out.println("OriginalFilename: " + file.getOriginalFilename());
		System.out.println("InputStream: " + file.getInputStream());
		return "success";
	}

	<mvc:interceptors>
		<!-- 配置自定义的拦截器 -->
		<bean class="com.atguigu.springmvc.interceptors.FirstInterceptor"></bean>
		
		<!-- 配置拦截器(不)作用的路径 -->
		<mvc:interceptor>
			<mvc:mapping path="/emps"/>
			<bean class="com.atguigu.springmvc.interceptors.SecondInterceptor"></bean>
		</mvc:interceptor>
	</mvc:interceptors>

	/**
	 * 1. 在 @ExceptionHandler 方法的入参中可以加入 Exception 类型的参数, 该参数即对应发生的异常对象
	 * 2. @ExceptionHandler 方法的入参中不能传入 Map. 若希望把异常信息传导页面上, 需要使用 ModelAndView 作为返回值
	 * 3. @ExceptionHandler 方法标记的异常有优先级的问题. 
	 * 4. @ControllerAdvice: 如果在当前 Handler 中找不到 @ExceptionHandler 方法来出来当前方法出现的异常, 
	 * 则将去 @ControllerAdvice 标记的类中查找 @ExceptionHandler 标记的方法来处理异常. 
	 */
	@ExceptionHandler({ArithmeticException.class})
	public ModelAndView handleArithmeticException(Exception ex){
		System.out.println("出异常了: " + ex);
		ModelAndView mv = new ModelAndView("error");
		mv.addObject("exception", ex);
		return mv;
	}

	@ResponseStatus(reason="测试",value=HttpStatus.NOT_FOUND)
	@RequestMapping("/testResponseStatusExceptionResolver")
	public String testResponseStatusExceptionResolver(@RequestParam("i") int i){
		if(i == 13){
			throw new UserNameNotMatchPasswordException();
		}
		System.out.println("testResponseStatusExceptionResolver...");
		
		return "success";
	}

@RequestMapping(value="/testDefaultHandlerExceptionResolver",method=RequestMethod.POST)
	public String testDefaultHandlerExceptionResolver(){
		System.out.println("testDefaultHandlerExceptionResolver...");
		return "success";
	}

	<!-- 配置使用 SimpleMappingExceptionResolver 来映射异常 -->
	<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
		<property name="exceptionAttribute" value="ex"></property>
		<property name="exceptionMappings">
			<props>
				<prop key="java.lang.ArrayIndexOutOfBoundsException">error</prop>
			</props>
		</property>
	</bean>	

	<context:component-scan base-package="com.atguigu.springmvc" use-default-filters="false">
		<context:include-filter type="annotation" 
			expression="org.springframework.stereotype.Controller"/>
		<context:include-filter type="annotation" 
			expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
	</context:component-scan>

	<context:component-scan base-package="com.atguigu.springmvc">
		<context:exclude-filter type="annotation" 
			expression="org.springframework.stereotype.Controller"/>
		<context:exclude-filter type="annotation" 
			expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
	</context:component-scan>