spring mvc 系列3 返回JSON以及文件下传

/**
	 * 
	 * @功能模块: add
	 * @方法说明: 添加一个对象
	 * @version: 1.0
	 * @param goodsType
	 *            GoodsTypeModel
	 * @return Object spring 自动转换成 json 数据
	 * @throws
	 */
	@RequestMapping(params = "method=add")
	@ResponseBody
	public Object add(@ModelAttribute("goodsType") GoodsTypeModel goodsType) {
		return this.goodsTypeService.add(goodsType);// 返回的对象为：GoodsTypeModel
	}

/**
	 * 
	 * @功能模块: add
	 * @方法说明: 处理 method=add 请求, 添加商品信息
	 * @version: 1.0
	 * @param goodsInfo
	 *            商品信息对象，由spring自动获取
	 * @param model
	 * @return ModelMap 由spring自动生成json数据
	 * @throws IOException 
	 * @throws
	 */
	@RequestMapping(params = "method=add")
	//@ResponseBody
	public void add(@ModelAttribute("goodsInfo") GoodsInfoModel goodsInfo,
			HttpServletResponse response) throws IOException {
		if (!goodsInfo.getMpFile().isEmpty()) {
			goodsInfo.setGiImg(FileUploadUtil.saveFileUpload(goodsInfo.getMpFile(),	GoodsInfoModel.DEFAULT_FILE_UPLOAD_DIR));
		}
		this.goodsInfoService.add(goodsInfo);
		//return this.goodsInfoService.add(goodsInfo);
		// EXT 文件上传时，要返回的头部信息类型为 text/html,
		// 而用@ResponseBody返回的头部信息为application/json所以自动转换类型
		// 由于本人能力有限，不知道如果要用@ResponseBody的时候怎么转换，呵呵
		JsonUtil.printJSON(response, new Result());
	}
	/*
	 * 多文件上传时，请使用：DefaultMultipartHttpServletRequest
	public String add(@ModelAttribute("goodsInfo") GoodsInfoModel goodsInfo, DefaultMultipartHttpServletRequest multipartRequest){
		List<MultipartFile> mpFiles = multipartRequest.getFiles("mpFile");
		String fileNames = null;
		for(MultipartFile mpFile : mpFiles){
			if( ! mpFile.isEmpty()){
				if(fileNames!=null){
					fileNames += "," + FileUploadUtil.saveFileUpload(mpFile, GoodsInfoModel.DEFAULT_FILE_UPLOAD_DIR);
				}else{
					fileNames = FileUploadUtil.saveFileUpload(mpFile, GoodsInfoModel.DEFAULT_FILE_UPLOAD_DIR);
				}					
			}
		}
		goodsInfo.setGiImg(fileNames);
		this.goodsInfoService.add(goodsInfo);
		return "redirect:/Product.do?method=list";
	}*/

	@RequestMapping(params = "method=login")
	public ResponseEntity<String> doFirst(@RequestParam("u") String u,@RequestParam("p") String p,HttpSession session,ModelMap model){
		HttpHeaders headers = new HttpHeaders();
		MediaType mt=new MediaType("text","html",Charset.forName("gbk"));
		headers.setContentType(mt);
		ResponseEntity<String> re=null;
		String return = new String("test");
		re=new ResponseEntity<String>(return,headers, HttpStatus.OK);
		return re;
       }

	@RequestMapping(params = "method=login")
	public ResponseEntity<String> doFirst(@RequestParam("u") String u,@RequestParam("p") String p,HttpSession session,ModelMap model){
		HttpHeaders headers = new HttpHeaders();
		MediaType mt=new MediaType("text","html",Charset.forName("gbk"));
		headers.setContentType(mt);
		ResponseEntity<String> re=null;
		String returnString = new String("test");
		re=new ResponseEntity<String>(returnString, headers, HttpStatus.OK);
		return re;
       }

	@RequestMapping(params = "method=login")
	public ResponseEntity<String> doFirst(@RequestParam("u") String u,@RequestParam("p") String p,HttpSession session,ModelMap model){
		HttpHeaders headers = new HttpHeaders();
		MediaType mt=new MediaType("text","html",Charset.forName("gbk"));
		headers.setContentType(mt);
		ResponseEntity<String> re=null;
		String return = new String("test");
		re=new ResponseEntity<String>(return,headers, HttpStatus.OK);
		return re;
       }

    @RequestMapping(params = "method=add")  
    @ResponseBody  
    public String add(@ModelAttribute("goodsInfo") GoodsInfoModel goodsInfo,  
            HttpServletResponse response) throws IOException {
        // ...
        return "{success:true}";
    }