# # 文件上传

关于文件上传的支持,很多朋友询问为何Ui界面不显示上传选择页面元素,而是输入框,这里做一个统一的说明

在`SwaggerBootstrapUi`以前的版本中(1.8.9之前),如果需要使用文件上传，界面显示,需要做如下代码设置：

    @ApiOperation(value = "多文件MultipartFile上传")
    @ApiImplicitParams({@ApiImplicitParam(name = "file[]", value = "文件流对象,接收数组格式", required = true,dataType = "MultipartFile",allowMultiple = true),
                        @ApiImplicitParam(name = "title", value = "title", required = true)}
                      )
    @RequestMapping(value="/uploadMaterial",method = RequestMethod.POST)
    @ResponseBody
    public RestMessage uploadMaterial(@RequestParam(value="file[]",required = true) MultipartFile[] files,@RequestParam(value = "title") String title, HttpServletRequest request) throws IOException {
        //int mul=1*1024*1024;
        List<Map> uploadFiles= upload(request,files);
        RestMessage rm=new RestMessage();
        rm.setData(uploadFiles);
        return rm;
    }

需要指定`dataType="MultipartFile"`,并且`allowMultiple = true`必须设置,该属性从字面意思能知道,允许多文件上传，这里需要说明一下,因为在以前的版本作者并不知道文件的类型,所以特意强加了`MultipartFile`类型,来达到Ui的线上显示效果,所以单文件的上传一直并未支持.

在1.9.0版本中，添加了对单文件上传的支持,多文件上传不需要多个input元素,开发者只需要按住`Ctrl`键即可多选文件进行上传，三种情况供大家参考使用：

## # 多文件MultipartFile类型上传

这种类型在以前的版本中都支持,需要指定`dataType="MultipartFile"`,并且`allowMultiple = true`,示例代码如下：

    @ApiOperation(value = "多文件MultipartFile上传")
    @ApiImplicitParams({@ApiImplicitParam(name = "file[]", value = "文件流对象,接收数组格式", required = true,dataType = "MultipartFile",allowMultiple = true),
                        @ApiImplicitParam(name = "title", value = "title", required = true)}
                      )
    @RequestMapping(value="/uploadMaterial",method = RequestMethod.POST)
    @ResponseBody
    public RestMessage uploadMaterial(@RequestParam(value="file[]",required = true) MultipartFile[] files,@RequestParam(value = "title") String title, HttpServletRequest request) throws IOException {
        //more.....

    }

在Ui的界面中,显示效果如下：

## # 多文件File类型上传

除了dataType类型设置为`MultipartFile`外,开发者还可以设置为`__File`类型,代码示例如下：

    @ApiOperation(value = "多文件File上传")
    @ApiImplicitParams({@ApiImplicitParam(name = "file[]", value = "文件流对象,接收数组格式", required = true,dataType = "__File",allowMultiple = true),
                        @ApiImplicitParam(name = "title", value = "title", required = true)}
                      )
    @RequestMapping(value="/uploadMaterial1",method = RequestMethod.POST)
    @ResponseBody
    public RestMessage uploadMaterial1(@RequestParam(value="file[]",required = true) MultipartFile[] files,@RequestParam(value = "title") String title, HttpServletRequest request) throws IOException {
        //more....
    }

## # 单文件File类型上传

和多文件File类型上传类似,只需要去掉`allowMultiple = true`属性即可，代码示例如下：

    @ApiOperation(value = "单文件File上传")
    @ApiImplicitParams({@ApiImplicitParam(name = "file", value = "文件流对象,接收数组格式", required = true,dataType = "__File"),
                        @ApiImplicitParam(name = "title", value = "title", required = true)}
                      )
    @RequestMapping(value="/uploadMaterial2",method = RequestMethod.POST)
    @ResponseBody
    public RestMessage uploadMaterial2(@RequestParam(value="file",required = true) MultipartFile file,@RequestParam(value = "title") String title, HttpServletRequest request) throws IOException {
        //more...
    }

以上三种情况示例可参考demo代码UploadController.java
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