Two methods of uploading files in SpringMVC

Reference: http://blog.csdn.net/yyywyr/article/details/44571353
http://blog.csdn.net/a1314517love/article/details/24183273

Step 1: Configure spring

<!-- Upload the multipart file configuration used -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="UTF-8"/>
		<!--1024*1024*10000 is 1000M-->
		<property name="maxUploadSize" value="200000" />
		<property name="maxInMemorySize" value="40960" />
		<!--resolveLazily property is enabled to defer file resolution in order to catch file size exceptions in UploadAction -->
		<property name="resolveLazily" value="true"/>
	</bean>

Step 2: Catch the exception yourself in the upload action

@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", "The file should not be larger than"+  
                       getFileKB(((MaxUploadSizeExceededException)ex).getMaxUploadSize()));  
                     } else{  
                        model.put("errors", "I don't know the error: " + 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";  
    }

Step 3: Interface

<script type="text/javascript">  
$(function() {  
    $('#frmupload1').submit(function() {  
        if ($('#file1').val() == '') {  
            alert('Please choose to upload the import file!');  
            $('#file1').focus();  
            return false;  
        }else{  
            if(!isvalidatefile($('#file1').val()))  
                  return false;  
                  
        }  
    });  
    $('#frmupload2').submit(function() {  
        if ($('#file2').val() == '') {  
            alert('Please choose to upload the import file!');  
            $('#file2').focus();  
            return false;  
        }else{  
            if(!isvalidatefile($('#file2').val()))  
                  return false;  
                  
        }  
    });  
});  
  
function isvalidatefile(obj) {  
      
    var extend = obj.substring(obj.lastIndexOf(".") + 1);  
    //alert(extend);  
    if (extend == "") {  
    } else {  
        if (!(extend == "xls" )) {  
            alert("Please upload a file with the extension xls(Excel2003) or xlsx(Excel2007)!");  
              
            return false;  
        }  
    }  
    return true;  
}  
<body>  
<h1>Upload file</h1>  
<form action="" method="post" enctype="multipart/form-data" onsubmit="return checkSubmit();">  
  
    <p>Please select a file:</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>

Step 4: Receive the common parameters of the form form

The method is: after forcibly converting HttpServletRequest req into MultipartHttpServletRequest req, get it through req.getParameter("id");

HttpServletRequest request;
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
MultipartFile file = multipartRequest.getFile("file");
String id = multipartRequest.getParameter("id");
String fileName = file.getOriginalFilename();

Reference: http://blog.csdn.net/z69183787/article/details/44152287

spring mvc file upload (single file upload | multiple file upload)
http://www.cnblogs.com/dengfukui/p/6252798.html

Two methods of uploading files in SpringMVC

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