用form-data格式传数据，后台servlet的httpservletrequest无法获得值

在用highcharts报表插件时，用自己写的servlet生成图片，始终不能获得传输到后台的值，highcharts会传四个值到servlet，分别为width，type，svg，filename；

刚开始用request.getParameter("type");request.getParameter("svg");
获取传递过来的值，结果值为null；

原因：highcharts用类似文件的格式传递数据

------WebKitFormBoundarywzfipkN3Y5Ob91BE
Content-Disposition: form-data; name="filename"

chart
------WebKitFormBoundarywzfipkN3Y5Ob91BE
Content-Disposition: form-data; name="type"

image/jpeg
------WebKitFormBoundarywzfipkN3Y5Ob91BE
Content-Disposition: form-data; name="width"

800
------WebKitFormBoundarywzfipkN3Y5Ob91BE
Content-Disposition: form-data; name="svg"

<svg xmlns:xlink="http://www.w3.org/1999/xlink" ......</svg>
------WebKitFormBoundarywzfipkN3Y5Ob91BE--

直接用httpservletrequest的.getParameter（）方法无法获得值；

解决办法：

导入commons-fileupload.jar

            String type = null;
            String svg = null;
            String filename = null;
            DiskFileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
            List items = upload.parseRequest(request);
            for (Iterator i = items.iterator(); i.hasNext();) { 
                FileItem fileItem = (FileItem) i.next(); 
                String field = fileItem.getFieldName(); 
                if(field.equals("type")){ 
                          type = fileItem.getString(); 
                          continue; 
                }else if(field.equals("svg")){ 
                         svg = fileItem.getString(); 
                         continue; 
                }else if(field.equals("filename")){ 
                         filename = fileItem.getString(); 
                         continue; 
                }
            }
即可取得由上述格式（form-data）传输的值。