无xml配置的springmvc上传文件问题解决

springmvc下的文件上传比在struts2下简单多了，只需要几行代码就可以解决，但是在我的项目里却一直报：

HTTP Status 400 - Required request part 'uploadFile' is not present

仔细核对了上传参数名发现一直没错，最后发现是因为是没有xml的配置，在javaconfig里的配置没有根据容器要求的名字去命名bean。狗血。

错误的地方：

    /*
     * resolve the multipart file upload.
     */
    @Bean
    public MultipartResolver getResolver(){
                //就是这里，我一开始用resolver命名，导致容易无法识别。
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        multipartResolver.setDefaultEncoding("utf-8");
        System.out.println("init resolver...");
        return multipartResolver;
    }

更正：

    /*
     * resolve the multipart file upload.
     */
    @Bean
    public MultipartResolver getResolver(){
                //更改为multipartResolver即可。
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
        multipartResolver.setDefaultEncoding("utf-8");
        System.out.println("init resolver...");
        return multipartResolver;
    }

附上控制器的代码：

@Controller
public class UploadController {

    @RequestMapping(value = "/testUpload", method = RequestMethod.POST)
    public @ResponseBody Map uploadFile(
            @RequestPart(name = "uploadFile") MultipartFile file) {
        Map map = new HashMap();

        File dir = new File(File.separator + "home" + File.separator + "senninha");
        if (!dir.exists()) {
            dir.mkdirs();
        }

        File saveFile = new File(dir + File.separator + file.getOriginalFilename());
        BufferedOutputStream os = null;
        try {
            os = new BufferedOutputStream(new FileOutputStream(saveFile));
            InputStream is = file.getInputStream();
            byte[] b = new byte[1024];
            int i = -1;
            while((i = is.read(b)) != -1){
                os.write(b,0,i);
            }
            map.put("code", 0);
            map.put("info", "upload success!");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        return map;
    }
}

简单jsp页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>





    

        File to upload: 
         Press here to upload the file!
    
 

ok可以上传啦。