File Upload: Commonsmultipartresolver

I. INTRODUCTION

Commonsmultipartresolver is based on the Apache Commons fileupload to implement the file upload function, the main role is to configure file upload some properties.

Two. Configuration

1) rely on Apache Commons FileUpload, so maven Pom file added dependency;

<dependency><groupid>commons-fileupload</groupid><artifactid>commons-fileupload</ Artifactid><version>1.3.3</version></dependency>

2) applicationcontext.xml Configuration bean

    <!--file Upload parser--    <bean id= "Multipartresolver" class= " Org.springframework.web.multipart.commons.CommonsMultipartResolver ">        <property name=" Maxuploadsize " Value= "209715200"/>        <property name= "maxinmemorysize" value= "40960"/>    </bean>

3) The source of the ID, view SPRINGMVC's core controller dispatcherservlet, there are some bean name constants defined

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";
   

Three. Use

1) Process:

The client request must be multiparthttpservletrequest (a subclass of HttpServletRequest) Request---> Spring's Dispatcherservlet calls Method Checkmultipart () Validation---> Multipartresolver (some properties that are configured in the configuration file are verified: for example, the maximum value of a file)

2) After the test, the code to the file processing example

@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); Writes the uploaded file to the file specified on the server
        } catch (Exception e) {
            E.printstacktrace ();
            Return Ajaxlist.createerror ("server Exception");
        
    }
     return ajaxlist.createsuccess ("Upload succeeded");
}

　

　　

File Upload: Commonsmultipartresolver