一. 简介
CommonsMultipartResolver是基于Apache的Commons FileUpload来实现文件上传功能的,主要作用是配置文件上传的一些属性。
二. 配置
1）依赖Apache的Commons FileUpload，所以Maven的pom文件添加依赖；
<dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.3</version></dependency>
2）applicationContext.xml配置bean
???<!-- 文件上传解析器--> ???<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> ???????<property name="maxUploadSize" value="209715200"/> ???????<property name="maxInMemorySize" value="40960"/> ???</bean>
3）id的来源，查看springMVC的核心控制器DispatcherServlet，有一些bean名字常量的定义
lic class DispatcherServlet extends FrameworkServlet { ???public static final String MULTIPART_RESOLVER_BEAN_NAME = "multipartResolver"; ???public static final String LOCALE_RESOLVER_BEAN_NAME = "localeResolver"; ???public static final String THEME_RESOLVER_BEAN_NAME = "themeResolver"; ???public static final String HANDLER_MAPPING_BEAN_NAME = "handlerMapping"; ???public static final String HANDLER_ADAPTER_BEAN_NAME = "handlerAdapter"; ???public static final String HANDLER_EXCEPTION_RESOLVER_BEAN_NAME = "handlerExceptionResolver"; ???public static final String REQUEST_TO_VIEW_NAME_TRANSLATOR_BEAN_NAME = "viewNameTranslator"; ???public static final String VIEW_RESOLVER_BEAN_NAME = "viewResolver"; ???public static final String FLASH_MAP_MANAGER_BEAN_NAME = "flashMapManager";三. 使用
1）流程：
客户端请求必须是MultipartHttpServletRequest（HttpServletRequest的一个子类）请求 ---> spring的DispatcherServlet会调用方法checkMultipart()验证 ---> multipartResolver（会检验配置文件里面配置的一些属性：比如文件的最大值）
2）检验后，代码对文件的处理例子
@RequestMapping("/fileUpload")
public AjaxList fileUpload(HttpServletRequest request,HttpServletResponse response){
???MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
???MultipartFile file = multiRequest.getFile("fileName");
???if(file!=null){
???????File localFile = new File("D:/"+file.getOriginalFilename());
???????try {
???????????file.transferTo(localFile); //将上传文件写到服务器上指定的文件
???????} catch (Exception e) {
???????????e.printStackTrace();
???????????return AjaxList.createError("服务器异常");
???????}
???}
????return AjaxList.createSuccess("上传成功");
}
文件上传：CommonsMultipartResolver
原文地址：https://www.cnblogs.com/knsbyoo/p/9047055.html