form表单提交信息（包含文字以及照片信息）使用MultipartRequest进行读取

protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		response.setHeader("Access-Control-Allow-Origin", "*");
		response.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();
		JSONObject resultJson = new JSONObject();

		int maxPostSize = 1 * 100 * 1024 * 1024;
		String appname = "";
    	String applyid = "";
		String applytel = "";
		String appcard = "";
    	String addrss = "";
		String detailaddress = "";
		File previewImg3 = null;
		File previewImg1 = null;
		File previewImg2 = null;
		String userNo =  (String)request.getSession().getAttribute("userNameFront");
		String fwpath="D:\\temp\\aaa\\bb\\";
		CreateSerialNumber createSerialNumber =new  CreateSerialNumber();
		String uuID = createSerialNumber.createOrderSn();
		 DBTools dbTools = new DBTools("qrcode");
		TResercardMapper tResercardMapper = dbTools.createMapper(TResercardMapper.class);
		TResercard tResercard = new TResercard();
		Date nowDate = new Date();

        String contentType = request.getContentType();
        if (contentType != null && contentType.contains("multipart/form-data")) {
            // 将转化后的 request 放入过滤链中
        	MultipartRequest mulitReq=new MultipartRequest(request,"D:/upload_test11/",maxPostSize,"utf-8");
        	previewImg3 = mulitReq.getFile("previewImg3");//读文件 文件的name
        	previewImg2 = mulitReq.getFile("previewImg2");//读文件 文件的name
        	previewImg1 = mulitReq.getFile("previewImg1");//读文件 文件的name
        	appname = mulitReq.getParameter("appname");
        	applyid = mulitReq.getParameter("applyid") == null ? null : mulitReq.getParameter("applyid").toString(); //读文本框里 input框的name
    		applytel = mulitReq.getParameter("applytel") == null ? null : mulitReq.getParameter("applytel").toString();//读文本框里 input框的name
    		appcard = mulitReq.getParameter("appcard") == null ? null : mulitReq.getParameter("appcard").toString();//读文本框里 input框的name
    		addrss = mulitReq.getParameter("addrss") == null ? null : mulitReq.getParameter("addrss").toString();//读文本框里 input框的name
    		detailaddress = mulitReq.getParameter("detailaddress") == null ? null : mulitReq.getParameter("detailaddress").toString();
        }
			Syslog.info("DBToolst   nowDate  qrcode");

			tResercard.setUuid(uuID);
			tResercard.setAddress(addrss);
			tResercard.setAddressdetail(detailaddress);
			tResercard.setUserno(userNo);
			tResercard.setApplyname(appname);
			tResercard.setApplyid(applyid);
			tResercard.setApplytel(applytel);
			tResercard.setApplycardtype(appcard);
			tResercard.setApplytime(nowDate);

			Syslog.info("Syslog++++addDaMengXiaomCard+++++出去了了");

			System.out.println("tResercard.toString()");
			System.out.println(tResercard.toString());
			Syslog.info(tResercard.toString());

			int insertNumber = tResercardMapper.insertSelective(tResercard);
			if(insertNumber == 1) {
				Syslog.info("成功插入数据：----"+insertNumber);
				resultJson.put("code", "0000");
				resultJson.put("msg", "success");
			}else {
				resultJson.put("code", "1111");
				resultJson.put("msg", "插入数据库失败");
			}
			dbTools.closeSqlSession();
		out.println(resultJson);
		out.close();
	}

　　此种方法可以将form表单中的文本   和图片信息进行分离读取；

文件会在运行

new MultipartRequest(request,"D:/upload_test11/",maxPostSize,"utf-8")

;

构造器是自动分离文本和文件；并将文件读到 设置的路径中，

原文地址：https://www.cnblogs.com/cjeandailynotes/p/10855913.html