ssm 업로드 및 다운로드

1 가져오기jar

        <dependencies>
        <dependency>
            <groupId>commons-fileuploadgroupId>
            <artifactId>commons-fileuploadartifactId>
            <version>1.3.1version>
        dependency>
        <dependency>
            <groupId>commons-iogroupId>
            <artifactId>commons-ioartifactId>
            <version>2.2version>
        dependency>

2 springmvc 구성

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/page/" p:suffix=".jsp" />
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    
    
    <property name="defaultEncoding" value="UTF-8">property>  
    
    <property name="maxUploadSize" value="10485760">property>    
    bean> 

3 코드 업로드

@RequestMapping("upload")
    public String upload(MultipartFile file,HttpServletRequest request)
    {
        String fileName = file.getOriginalFilename();    
        File dir = new File("e:/temp/",fileName);          
        if(!dir.exists()){  
            dir.mkdirs();  
        }  
        //MultipartFile         
        try {
            file.transferTo(dir);
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
//        DispatcherServlet 
        return "index";
    }

    @RequestMapping("hello")
    public String index(String page)
    {
        return "index";
    }

4 다운로드 코드

    @RequestMapping("down")  
    public void down(HttpServletRequest request,HttpServletResponse response) throws Exception{  
        //    ，myfile.txt          
        String fileName = request.getSession().getServletContext().getRealPath("upload")+"/myfile.txt";  
        //       
        InputStream bis = new BufferedInputStream(new FileInputStream(new File(fileName)));  
        //            
        String filename = "    .txt";  
        //  ，           
        filename = URLEncoder.encode(filename,"UTF-8");  
        //         
        response.addHeader("Content-Disposition", "attachment;filename=" + filename);    
        //1.    ContentType  ，    ，               
        response.setContentType("multipart/form-data");   
        BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());  
        int len = 0;  
        while((len = bis.read()) != -1){  
            out.write(len);  
            out.flush();  
        }  
        out.close();  
    }  

5주 jsp 페이지 업로드 시from에 주의

method="post" enctype="multipart/form-data"

이 두 가지 관건
6주 다운로드할 때 이 폴더와 파일이 없으면 하나를 만들고 페이지를method="get"으로 변경해야 합니다