首先需要兩個jar包

然後在spring-mvc.xml檔案中插入下面的程式碼

<!-- 定義檔案上傳解析器 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 設定預設編碼 -->
        <property name="defaultEncoding" value="UTF-8" />
        <!-- 設定檔案上傳的最大值5MB，5*1024*1024 -->
 

        <property name="maxUploadSize" value="5242880" />
        <property name="maxInMemorySize" value="4096" />
    </bean>

下面是表單的程式碼，注意一定要加上enctype=“multipart/form-data”
method=“post”

<form action="${pageContext.request.contextPath }/uploadfile.do" mwthod="post" enctype="multipart/form-data"
 
>
	<input type="file" name="pic" />
	<input type="submit" name="提交" />
</form>

@RequestMapping("/uploadfile.do")
	public String doUploadFile(@RequestParam MultipartFile pic){
		//設定一下儲存的路徑
		String path = "D:/pic/";
		File dir = new File(path);
        if (!dir.isDirectory())
            dir.
 
mkdir();
        //給檔案一個新的名字
        String filename = UUID.randomUUID().toString().replaceAll("-", "");
        //獲取檔案的副檔名
        String ext = FilenameUtils.getExtension(pic.getOriginalFilename());
        try {
        	//把檔案存到指定的位置
			pic.transferTo(new File(path + filename + "." + ext));
		} catch (IllegalStateException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return "redirect:/filetest.jsp";
	}