点击按钮弹出文件保存弹出框。

点击一个按钮弹出选择路径的弹框来（最后自动后缀就是txt）。并将路径和所填写的文件名字获取到。。。

参考上传文件时获取文件名称

莫非就是传说中的

<input type="file">  

<bean id="multipartResolver"  
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver"  
        p:defaultEncoding="utf-8" />  

<dependency>    
            <groupId>commons-fileupload</groupId>    
            <artifactId>commons-fileupload</artifactId>    
            <version>1.2.2</version>    
        </dependency>  

 public void merSave(final ModelMap model, HttpServletRequest request,  
            HttpServletResponse response,  
            @RequestParam Map<String, String> params,  
            @RequestParam(value = "attachment", required = false) MultipartFile attachment){
                        String originalFilename = attachment.getOriginalFilename();//图片原名.png 
                        }