Attachment upload in Java

1, because the upload file will be used to the Multiparthttpservletrequest object, we need to configure a parser in the SPRINGMVC configuration file

<!--in order to use the Multiparthttpservletrequest object that spring provides us with, we need to configure a parser--       <!--and for the bean component to work, You must configure an ID property--       <bean id= "Multipartresolver" class= " Org.springframework.web.multipart.commons.CommonsMultipartResolver ">         <!--request Encoding--         < Property Name= "Defaultencoding" value= "UTF-8"/>         <!--upload file size--         <property name= "Maxuploadsize" Value= "10000000"/>         <!--buffer Size--         <property name= "maxinmemorysize" value= "1024x768"/> </                Bean>

2. Front-end JSP code

<div>     <span> Upload attachments: </span><input type= "file" id= "Accessory1" name= "Accessory1"  Onchange= "Checkfile (This)"/>     <font size= "2" color= "Red" > Note: Upload file size cannot exceed 10m</font>
</div>

Upload file Check function checkfile (file) {var flag = GetFileSize (file); if (!flag) {var fileInput = $ ("#accessory1");
Validation does not pass, empty input box Fileinput.replacewith (Fileinput.clone ()); }} var fileSize = 0;                 The file size defaults to 0 function getfilesize (file) {/* (1) to determine the file suffix type */var STRs = new Array ();//define an array var Pic1 = $ (file). val (); Gets the value of the input box, file path STRs = Pic1.split ('. '); Divide into arrays storage var suffix = strs[strs.length-1]; Get file suffix if (suffix! = ' pdf ' && suffix! = ' docx ' && suffix! = ' doc ' && suffix! = ' tx T ') {alert ("can only upload files with the extension PDF, docx, doc, Text!)               ");            return false;            }/* (2) Gets the file size in kilobytes */fileSize = file.files[0].size/1024; if (FileSize > 10000) {alert ("The file you selected is too large, select a file less than 10M!")                   ");                return false;        } return true; }

　　　　　　　　   The method that is executed when the form is submitted                var form = new FormData ();                Form.append ("Accessory1", $ (' #accessory1 ') [0].files[0]);

Back-end request processing
@RequestMapping (value= "/addgg", Method=requestmethod.post)    @ResponseBody public    boolean ADDGG ( Multipartfile accessory1) {//Post an announcement if there is an attachment upload if        (accessory1! = null) {
Logger.info ("<--with attachment announcement start-up");            InputStream is = null;            try {is                = Accessory1.getinputstream ();                Byte[] B = new byte[is.available ()];                Is.read (b);                Jjkjgggl.setacccontent (b);            } catch (IOException e) {                logger.info ("<--attachment read exception!) -->: "+e);                throw new RuntimeException ("attachment Read exception! ");            } finally{                try {                    is.close ();                } catch (IOException e) {                    logger.info ("<--attachment read Release resource exception! -->: "+e);                    throw new RuntimeException ("attachment read frees resource exception! ");                }            }        } return false;    }

Attachment upload in Java