javaweb接收客户端上传的图片

 @RequestMapping(method = RequestMethod.POST, value = "/uploadfile")
@Transactional(propagation=Propagation.REQUIRED,rollbackFor=Exception.class)
public void uploadfile(HttpServletRequest request,HttpSession session,HttpServletResponse response){
String newfile = "";
try{  
request.setCharacterEncoding("utf-8");  
        //获得磁盘文件条目工厂。  
        DiskFileItemFactory factory = new DiskFileItemFactory();  
        //获取文件上传需要保存的路径，upload文件夹需存在。  
        String path =  ConstantUtil.PROJECT_PATH.replace("target/classes/", "src/main/webapp/upload");  
        //设置暂时存放文件的存储室，这个存储室可以和最终存储文件的文件夹不同。因为当文件很大的话会占用过多内存所以设置存储室。  
        factory.setRepository(new File(path));  
        //设置缓存的大小，当上传文件的容量超过缓存时，就放到暂时存储室。  
        factory.setSizeThreshold(1024*1024);  
        //上传处理工具类（高水平API上传处理？）  
        ServletFileUpload upload = new ServletFileUpload(factory);  
          
            //调用 parseRequest（request）方法  获得上传文件 FileItem 的集合list 可实现多文件上传。  
            List<FileItem> list = (List<FileItem>)upload.parseRequest(request);  
            for(FileItem item:list){  
                //获取表单属性名字。  
                String name = item.getFieldName();  
                //如果获取的表单信息是普通的文本信息。即通过页面表单形式传递来的字符串。  
                if(item.isFormField()){  
                    //获取用户具体输入的字符串，  
                    String value = item.getString();  
                    request.setAttribute(name, value);  
                }  
                //如果传入的是非简单字符串，而是图片，音频，视频等二进制文件。  
                else{   
                    //获取路径名  
                    String value = item.getName();  
                    //取到最后一个反斜杠。  
                    int start = value.lastIndexOf("\");  
                    //截取上传文件的 字符串名字。+1是去掉反斜杠。  
                    String filename = value.substring(start+1);  
                    filename = new Date().getTime() + filename.substring(filename.indexOf("."));
                    request.setAttribute(name, filename);  
                      
                    /*第三方提供的方法直接写到文件中。 
                     * item.write(new File(path,filename));*/  
                    //收到写到接收的文件中。  
                    OutputStream out = new FileOutputStream(new File(path,filename));  
                    InputStream in = item.getInputStream();  
                      
                    int length = 0;  
                    byte[] buf = new byte[1024];  
                    System.out.println("size:"+ item.getSize());  
                    newfile = filename;
                    System.out.println("newfile:"+ newfile);  
                    while((length = in.read(buf))!=-1){  
                        out.write(buf,0,length);  
                    }  
                    in.close();  
                    out.close();  
                }  
            }  
        }catch(Exception e){  
            e.printStackTrace();  
        }  

JsonUtil.success2page(response,"{"msg":"success","filename":""+newfile+""}");
}