spring文件上传

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

<property name="maxUploadSize" value="1073741824" /><!-- 上传大小限制-->
<property name="defaultEncoding" value="utf-8"></property>
<property name="resolveLazily" value="true"></property>

</bean>

@RequestMapping(value = "/uploadfile.do")
 public @ResponseBody String saveProduct(HttpServletRequest rq,@RequestParam("file") MultipartFile file) {
/*
*调用文件处理工具类，也可以直接在控制器里写
*url为保存路径
*/

  saveFile(rq, file, url);

return "";
}

public class SaveFile {

    /**
     * @param rq
     *            request对象
     * @param file
     *            需要保存的文件
     * @param url
     *            文件保存路径类型
     * 
     * */
    public String saveImage(HttpServletRequest rq, MultipartFile file,
            String url) {
        File imageFile = null;
        String fileName = null;
        Date d=new Date();
        /*
         * 创建存储路径文件夹，在服务器目录下创建
         */
        File savePath = new File(rq.getServletContext().getRealPath(url));
        if (!savePath.exists()) {
            savePath.mkdirs();
        }
        if (null != file) {
            fileName = new Date().getTime()+new Random().nextInt(100)+file.getOriginalFilename();
            imageFile = new File(rq.getServletContext().getRealPath(+url),
                    fileName);

            try {
                file.transferTo(imageFile);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return url+"/"+fileName;
    }
}

<form action="uploadfile.do" method="post"
enctype="multipart/form-data">
<input class="file" type="file" name="file" ></input>
</form>

 1 <input class="file" type="file" onchange="uploadLogo(this)"
 2                     name="logo" value="123"></input>
 3 
 4 
 5 
 6 
 7 function uploadLogo(file) {
 8         var fileReader = new FileReader();
 9         var path = "";
10         uploadImages(file.files[0])
11 
12     }
13 
14     function uploadImages(file) {
15         var form = new FormData();
16         form.append("logo", file);
17 
18         $.ajax({
19             type : "post",
20             url : "/PrySecret/uploadLogo.do",
21             data : form,
22             async : false,
23             cache : false,
24             contentType : false,
25             processData : false,
26             success : function(data, status) {
27 
28                 var path = "<c:url value=‘data‘/>"
29                 alert(data);
30                 $("#logo")[0].src = "http://localhost:8080/PrySecret/data/"
31                         + data;35             },
36             error : function() {
37                 alert("服务器异常");
38             },
39             complete : function() {
40 
41             }
42         });
43     }