springmvc--implementation file upload download

Reference:
http://blog.csdn.net/u012706811/article/details/51059419
http://blog.csdn.net/u012660464/article/details/53434331 One, file upload 1. Introduction of dependency Packs

Add the following to the Pom.xml file, introducing the commons-fileupload and Commons-io two packages.

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId> commons-fileupload</artifactid>
    <version>1.3.1</version>
</dependency>

<dependency>
    <groupId>commons-io</groupId>
    <artifactid>commons-io</ artifactid>
    <version>2.3</version>
</dependency>

2.spring-mvc.xml

<!--file Upload-->
<bean id= "Multipartresolver" class= " Org.springframework.web.multipart.commons.CommonsMultipartResolver ">
    <!--maximum upload size (bytes)-->
    < Property Name= "Maxuploadsize" value= "1048576"/>
</bean>

3.fileupload.jsp

The form adds the enctype= "Multipart/form-data" attribute, which indicates that the file one or two stream is transmitted, otherwise the error is not correct.

<%@ page contenttype= "Text/html;charset=utf-8" language= "java"%>
 
4.success.jsp 
<%@ page contenttype= "Text/html;charset=utf-8" language= "java"%>
 
5.index.jsp 
<%@ page contenttype= "Text/html;charset=utf-8" language= "java"%>
 
6.FileController

    /**
     * To File upload page
     *
     * @return
    /@RequestMapping (value = "FileUpload", method = Requestmethod.get) Public
    String Tofileupload () {return
        "/file/fileupload";
    }

    /**
     * Single File Upload
     * *
     @param file
     * @return
    /@RequestMapping (value = "Upload", method = requestmethod.post) Public
    String FileUpload (@RequestParam ("file") Multipartfile file) {
        if (!file.isempty ()) {
            try {
                //save in F:\temp directory
                fileutils.copyinputstreamtofile (File.getinputstream (), New file ("f:\\ Temp ",
                        system.currenttimemillis () + file.getoriginalfilename ());
            } catch (IOException e) {
                e.printstacktrace ();
            }
        }
        Upload success, jump to Success page return
        "File/success";
    }
 
7. Multiple file uploads

    /** * to multiple File upload page * * @return/@RequestMapping (value = "Multifileupload", method = Requestmeth Od.
    Get) public String Tomultifileupload () {return "/file/multifileupload"; /** * Multiple File Upload * * @param multirequest * @return/@RequestMapping (value = "Multiupload ', method = Requestmethod.post ' public String multifileupload (Multiparthttpservletrequest multirequest) throws Ioexcep tion {iterator<string> filesnames = Multirequest.getfilenames ();//Get all file names while (Filesnames.hasnex
            T ()) {//iteration, operation of a single file String fileName =filesnames.next ();
            Multipartfile file = Multirequest.getfile (fileName);
                        if (!file.isempty ()) {Fileutils.copyinputstreamtofile (File.getinputstream ()), New file ("F:\\temp",
            System.currenttimemillis () + file.getoriginalfilename ()); }//upload succeeded, jump to Success page return "File/suCcess "; }
 
Second, File download 1.index.jsp

<%@ page contenttype= "Text/html;charset=utf-8" language= "java"%>
 
2.FileController 
Now the realization of the function is to click "Download the specified file" is downloaded in the controller designated good files, has not implemented the uploaded file into the database, nor the implementation of the download database to save the file, the future slowly improve.

    /** *
     Designated File Download * *
     @return
     * @throws ioexception
    /@RequestMapping (value = "Download", produces = "application/octet-stream;charset=utf-8") public
    responseentity<byte[]> Download () throws IOException {
///                Specify file, must be absolute path file
        = new file ("F:\\temp\\1513489657107psb.jpg");                Download Browser response file name
        String dfilename = "1.jpg";                The following starts to set up httpheaders, make browser response download
        httpheaders headers = new Httpheaders ();                Set the response mode
        headers.setcontenttype (mediatype.application_octet_stream);                Set Response file
        headers.setcontentdispositionformdata ("attachment", dfilename);                write back the file in binary form return to
        new Responseentity<byte[]> (Fileutils.readfiletobytearray), headers, httpstatus.created);
    }
 
Effect