檔案上傳

　匯入依賴：

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>1.2</version>
</dependency>

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.2
 
.2</version>
</dependency>

<!--檔案上傳解析器-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!--檔案上傳的字符集-->
    <property name="defaultEncoding" value="UTF-8"></property>
    <!--檔案上傳的總大小-->
    <property name="
 
maxUploadSize" value="5000000000"></property>
    <!--單個檔案的大小-->
    <property name="maxUploadSizePerFile" value="5000000"></property>
</bean>

/*單檔案上傳*/
@RequestMapping("/fileUpload")
public String fileUpdate(MultipartFile upload ,HttpSession session) throws IOException {
    //獲取絕對路徑
    String realPath = session.getServletContext().getRealPath("
 
/upload");
    //獲取檔案上傳提交的檔名
    String filename = upload.getOriginalFilename();
    //組合路徑+上傳操作
    upload.transferTo(new File(realPath,filename));
    return "index";
}

/*多檔案上傳*/
@RequestMapping("/fileUploads")
public String fileUpdates(@RequestParam  MultipartFile[] upload ,HttpSession session) throws IOException {
    //獲取絕對路徑
    String realPath = session.getServletContext().getRealPath("/upload");
    for (MultipartFile item:upload){
        //獲取檔案上傳提交的檔名
        String filename = item.getOriginalFilename();
        //組合路徑+上傳操作
        item.transferTo(new File(realPath,filename));
    }
    return "index";
}

/*檔案下載*/
@RequestMapping("/download")
public ResponseEntity<byte[]> dowload(HttpSession session) throws Exception {
    //獲取絕對路徑
    String realPath = session.getServletContext().getRealPath("/upload");
    //組裝路徑轉換為file物件
    File file=new File(realPath,"新建文字文件.txt");
    //設定頭 控制瀏覽器下載對應檔案
    HttpHeaders headers=new HttpHeaders();
    headers.setContentDispositionFormData("attachment",new String("新建文字文件.txt".getBytes("UTF-8"),"ISO-8859-1"));
    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);

}