spring mvc 文件上传

页面：

  <form action="upload" method="post" enctype="multipart/form-data" >
  	 文件:<input type="file" name="file"/>
  	 <input type="submit" />
  </form>

spring 配置
出去mvc基本配置外，添加

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

CommonsMultipartResolver继承自spring的CommonsFileUploadSupport，后者需要apache
commmon io和fileupload包的依赖。可以选择配置maxUploadSize属性，单位byte

controller

@Controller
@RequestMapping("/upload")
public class UploadConroller extends BaseController {
	
	@RequestMapping(method=RequestMethod.GET)
	public String upload(){
		return "upload";
	}
	
	@RequestMapping(method=RequestMethod.POST)
	public @ResponseBody String upload(@RequestParam("file") MultipartFile file,HttpServletRequest request){
		if(!file.isEmpty()){
			try {
				String basePath = request.getSession().getServletContext().getRealPath("/");
				String ofName = file.getOriginalFilename();
				ofName = ofName.substring(ofName.lastIndexOf("."));
				OutputStream out = new FileOutputStream(
							new File(basePath+"/WEB-INF/upload/"
				                +new Random().nextInt(1000)+ofName));
				out.write(file.getBytes());
				out.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return "SUCC";
	}
}