spring mvc CommonsMultipartResolver文件上传maxUploadSize限制大小-优快云博客

本文链接：https://blog.youkuaiyun.com/jsphnld/article/details/84215857

第一步：配置sping


<bean id="multipartResolver"
          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!--1024*200即200k-->
        <property name="maxUploadSize" value="204800"/>
        <!--resolveLazily属性启用是为了推迟文件解析，以便在UploadAction 中捕获文件大小异常-->
        <property name="resolveLazily" value="true"/>  
    </bean>

第二步：在上传action中自己捕获异常


 @RequestMapping
	public void execute(
			@RequestParam(required = false) MultipartFile file,
			@RequestParam(value = "file_info_id", required = false) Integer fileInfoId,
			ModelMap model, HttpServletRequest request) throws Exception {

		if (file == null || file.isEmpty()) {
			return;
		}
		byte[] bytes = file.getBytes();
			……………………
………………
}
  @ExceptionHandler(Exception.class)       
    public ModelAndView handleException(Exception ex,HttpServletRequest request) {     
    	 Map<Object, Object> model = new HashMap<Object, Object>();
    	 if (ex instanceof MaxUploadSizeExceededException){
    		            model.put("errors", "文件应不大于 "+
    		           getFileKB(((MaxUploadSizeExceededException)ex).getMaxUploadSize()));
    		         } else{
    		            model.put("errors", "不知错误: " + ex.getMessage());
    		        }
    	 return new ModelAndView("/common/file/upload", (Map) model);

    }  

    private String getFileKB(long byteFile){
    	if(byteFile==0)
    	   return "0KB";
    	long kb=1024;
    	return ""+byteFile/kb+"KB";
    }
    private String getFileMB(long byteFile){
    	if(byteFile==0)
     	   return "0MB";
     	long mb=1024*1024;
     	return ""+byteFile/mb+"MB";
    }

第三步：界面


<script type="text/javascript">
$(function() {
	$('#frmupload1').submit(function() {
		if ($('#file1').val() == '') {
			alert('请选择上传导入文件!');
			$('#file1').focus();
			return false;
		}else{
			if(!isvalidatefile($('#file1').val()))
				  return false;

		}
	});
	$('#frmupload2').submit(function() {
		if ($('#file2').val() == '') {
			alert('请选择上传导入文件!');
			$('#file2').focus();
			return false;
		}else{
			if(!isvalidatefile($('#file2').val()))
				  return false;

		}
	});
});

function isvalidatefile(obj) {

	var extend = obj.substring(obj.lastIndexOf(".") + 1);
	//alert(extend);
	if (extend == "") {
	} else {
		if (!(extend == "xls" )) {
			alert("请上传后缀名为xls(Excel2003)或xlsx(Excel2007)的文件!");

			return false;
		}
	}
	return true;
}
<body>
<h1>上传文件</h1>
<form action="" method="post" enctype="multipart/form-data" onsubmit="return checkSubmit();">

	<p>请选择文件：</p>

	<p ${not empty errors ?"style='color : red;'":""}>${errors}</p>
	<input type="file" name="file" id="file"/> <input type="submit" value="确定"/>
</form>
</body>

参考来源：
[url=http://blog.youkuaiyun.com/walkerjong/article/details/7211133]spring MVC上传文件使用了common.fileupload组件[/url]
[url=http://www.open-open.com/home/space-668-do-blog-id-5708.html]使用Spring MVC和注释配置来实现文件上传[/url]