SpringMVC创建web项目基础之(三)——Spring MVC实现文件上传

		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
		    <groupId>commons-io</groupId>
		    <artifactId>commons-io</artifactId>
		    <version>2.4</version>
		</dependency>

					<div class="col-lg-12" style="margin-top: 10px">
						<form id="upLoad_form" method="post" enctype="multipart/form-data"> 
							<input type="file" id="picture" name="file"> 
							<button  type="button" id="upload_btn" class="btn btn-primary" >上传图片</button>
						</form>
					</div>

@Resource
	private BookShopService mService;
/**
     * 上传图片
     * 
     * @param MultipartFile file 页面选中的文件
     * @param HttpServletRequest request 请求
     * @param HttpServletResponse response 响应
     * 
     */
    @RequestMapping(value = "/upload", method = RequestMethod.POST)  
    @ResponseBody
    public void upload(@RequestParam("file") MultipartFile file,HttpServletRequest request, HttpServletResponse response) {  
    	
    	try {
    	
			mService.uploadFile(file,request,response);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
    }  

public interface BookShopService {
public void uploadFile(MultipartFile file,HttpServletRequest request, HttpServletResponse response) throws Exception;
}

@Service
public class BookShopServiceImpl implements BookShopService {
@Override
	public void uploadFile(MultipartFile file,HttpServletRequest request, HttpServletResponse response) throws Exception {
BookShopUploadUtil.fileUp(file,request,response);
	}
}

public class BookShopUploadUtil {
	/**
     * 上传图片
     */
    public static void fileUp(MultipartFile file,HttpServletRequest request,
            HttpServletResponse response) throws Exception {
    	 String path="";//保存图片路径
    	 String filePath = Consts.CONTEXTPATH;//显示图片路径（相对路径）
    	 try {
             if (!file.isEmpty()){
                 
             //得到服务器中保存文件的绝对路径
             path = request.getServletContext().getRealPath(Consts.SAVE_PATH + "/");
                 //新建文件夹
            	 newFolder(path);
            	 //新建文件夹完成后将路径添加文件名
            	 path += file.getOriginalFilename();
            	 //页面显示图片的相对路径
            	 filePath += "/" + Consts.SAVE_PATH +  "/" + file.getOriginalFilename();
            	 //使用StreamsAPI方式拷贝文件
             Streams.copy(file.getInputStream(),new FileOutputStream(path),true);
             //将上面得到的图片相对路径返回给页面
         	 JSONObject json = new JSONObject();
             json.accumulate(Consts.SRC, filePath);
 			 json.accumulate("error", false);
 	         json.accumulate("message", "上传成功！");
 	         PrintWriter out = response.getWriter();
 	         out.print(json.toString());
 	         out.flush();
 	         out.close();
             }
         } catch (Exception e) {
             System.out.println("文件上传失败");
             e.printStackTrace();
             path="";
         }
    }
	/**
     * 创建文件夹
     * 
     * @param folderPath
     */
    public static void newFolder(String folderPath) {
        try {
            File myFilePath = new File(folderPath);
            if (!myFilePath.exists()) {
            	//创建多级文件夹
                myFilePath.mkdirs();
                System.out.println("创建文件夹路径：" + folderPath);
            }
        } catch (Exception e) {
            System.out.println("新建文件夹操作出错");
            e.printStackTrace();
        }
    }

}

public class Consts {  
 public final static String SRC = "src";  
 public final static String SAVE_PATH = "resources/bookshopupload/savefile/";    
}