Spring MVC uploads files

Web page upload file, first need to understand the MIME multimedia type

Http://www.w3school.com.cn/media/media_mimeref.asp

Look at the Web. XML configuration to consolidate prior knowledge

<?XML version= "1.0" encoding= "UTF-8"?><Web-appXmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"xmlns= "Http://java.sun.com/xml/ns/javaee"Xmlns:web= "Http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"ID= "webapp_id"version= "2.5">  <Display-name>WebTest</Display-name>  <Listener>        <Listener-class>Org.springframework.web.context.ContextLoaderListener</Listener-class>    </Listener>    <Context-param>        <Param-name>Contextconfiglocation</Param-name>        <Param-value>/web-inf/config/applicationcontext.xml/web-inf/config/codeifaction.xml</Param-value>    </Context-param>    <servlet>        <Servlet-name>Dispatcherservlet</Servlet-name>        <Servlet-class>Org.springframework.web.servlet.DispatcherServlet</Servlet-class>        <Init-param>            <Param-name>Contextconfiglocation</Param-name>            <Param-value>/web-inf/config/codeifaction.xml</Param-value>        </Init-param>        <Load-on-startup>1</Load-on-startup>    </servlet>    <!--intercept all requests that end with do -    <servlet-mapping>        <Servlet-name>Dispatcherservlet</Servlet-name>        <Url-pattern>*.do</Url-pattern>    </servlet-mapping>  <welcome-file-list>    <Welcome-file>Index.do</Welcome-file>  </welcome-file-list></Web-app>

And then the Applicationcontext.xml.

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"xmlns:p= "http://www.springframework.org/schema/p"Xmlns:context= "Http://www.springframework.org/schema/context"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/ Spring-beans-3.0.xsd Http://www.springframework.org/schema/context Http://www.springframework.org/schema/context /spring-context-3.0.xsd "Default-lazy-init= "true">    <!--start the Spring MVC Annotation feature to complete the mapping of requests and annotations Pojo -    <Beanclass= "Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"Lazy-init= "false" />    <!--It is also best to add defaultannotationhandlermapping, otherwise it will be overwritten with XML or other mappings!  -    <Beanclass= "Org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />    <!--resolution of the Model view name, that is, adding a prefix to the Model view name -    <Beanclass= "Org.springframework.web.servlet.view.InternalResourceViewResolver"P:prefix= "/web-inf/jsp/"P:suffix= ". jsp" />    <!--support for uploading files -    <BeanID= "Multipartresolver"class= "Org.springframework.web.multipart.commons.CommonsMultipartResolver"/></Beans>

In spring, the file is wrapped as a multipart type.

Then the controller.

 Packagecom.codeif.action;ImportJava.io.File;Importjava.util.Date;Importjavax.servlet.http.HttpServletRequest;ImportOrg.springframework.stereotype.Controller;ImportOrg.springframework.ui.ModelMap;Importorg.springframework.web.bind.annotation.RequestMapping;ImportOrg.springframework.web.bind.annotation.RequestParam;Importorg.springframework.web.multipart.MultipartFile; @Controller Public classuploadaction {@RequestMapping (value= "/upload.do")     PublicString Upload (@RequestParam (value = "File", required =false) multipartfile file, httpservletrequest request, Modelmap model) {SYSTEM.OUT.PRINTLN (Start); String Path= Request.getsession (). Getservletcontext (). Getrealpath ("Upload");//gets the absolute path to the upload directory of the Web root directoryString fileName = File.getoriginalfilename ();//file name uploaded from the page//String fileName = new Date (). GetTime () + ". jpg";System.out.println (path); File TargetFile=NewFile (path, fileName); if(!targetfile.exists ())        {Targetfile.mkdirs (); }        //Save        Try{File.transferto (targetfile); } Catch(Exception e) {e.printstacktrace (); } model.addattribute ("FileUrl", Request.getcontextpath () + "/upload/" +fileName); return"Result"; }}

Finally, the Web Form type:

<!DOCTYPE HTML>  <HTML>  <Head>  <MetaCharSet= "Utf-8">  <title>Upload image</title>  </Head>  <Body>  <formAction= "Upload.do"Method= "POST"enctype= "Multipart/form-data">  <inputtype= "File"name= "File" /> <inputtype= "Submit"value= "Submit" /></form>  </Body>  </HTML> 

Watch the enctype= "Multipart/form-data" here.

This is the setting of the mime of the request, the default is application/x-www-form-urlencoded, can not be used for file upload, only the use of multipart/form-data, to complete the transfer of file data, the following operation.

This completes the file upload

Uploadify plugin can be used to beautify upload

Spring MVC uploads files