from表单上传图片

　　1.要实现上传图片在form表单必须加上 <form enctype="multipart/form-data"> 

　　2.需要导的两个包　　commons-fileupload-xx.jar      commons-io-xx.jar

　　包链接：http://pan.baidu.com/s/1jIJ16KY 密码：5clh

以下是servlet中的代码

@Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        
        req.setCharacterEncoding("utf-8");
        //判断是否是上传
        boolean isMultipart = ServletFileUpload.isMultipartContent(req);
        if(isMultipart) {
            
            DiskFileItemFactory factory = new DiskFileItemFactory();
            //创建request处理器
            ServletFileUpload upload = new ServletFileUpload(factory);
            try {
                List<FileItem> list = upload.parseRequest(req);
                for (FileItem fileItem : list) {
                    if(fileItem.isFormField()) {
                        //非上传的普通属性
                        System.out.println(fileItem.getString());
                    }else {
                        //上传处理
                        String filedName = fileItem.getFieldName();
                        System.out.println(filedName);
                        
                        String name = fileItem.getName();
                        System.out.println(name);
                        //要上传到的路径
                        File file = new File("E://"+name);
                        fileItem.write(file);
                    }
                }
                
            
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
        
        
    }