Springmvc and servlets upload and download files (two ways to keep folders and store database blobs)

Participate in the project file upload and download. Once the struts2 is finished, SPRINGMVC it again today. Find SPRINGMVC Special Good package, basically do not have a few lines of code can be completed, the following code paste:

fileupanddown.jsp

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "%>
Fileupanddowncontroller.java
@RequestMapping (value = "/fileupload") public String Upload (@RequestParam (value = "File", Required = False) Multipartfile File,httpservletrequest request, Modelmap model) throws IOException {/*//Way one: Save file Folder try {String path = Request.getsessio N (). Getservletcontext (). Getrealpath ("/");//File Save folder, also customizable as absolute path string fileName = File.getoriginalfilename ();// Getoriginalfilename and GetName are not the same Oh System.out.println (path); File TargetFile = new file (path, fileName), if (!targetfile.exists ()) {targetfile.mkdirs ();} File.transferto (targetfile); Model.addattribute ("Upload.message", Request.getcontextpath () + "/upload/" + FileName);} catch (Exception e) {e.printstacktrace ();} *///mode two: Save inbound map<string, object> insertmap = new hashmap<string, Obje Ct> (); Insertmap.put ("Byt", File.getbytes ()); Insertmap.put ("FileName", File.getoriginalfilename ()); int flag = Fileupanddownmapper.savefileinfo (Insertmap), if (Flag > 0) model.addattribute ("Upload.message", "success"); Elsemodel.addattribute ("Upload.message", "FAilure "); return"/core/param/businessparam/uploadresult ";} 

Fileupanddownmapper.xml (the corresponding database is DB2, save blob type)
<?xml version= "1.0" encoding= "UTF-8"?
><! DOCTYPE Mapper Public "-//mybatis.org//dtd mapper 3.0//en" "Http://mybatis.org/dtd/mybatis-3-mapper.dtd" >< Mappernamespace= "Com.xx.persistence.FileUpAndDownMapper" ><resultmap id= "Filebean" type= " Com.xx.web.FileUpAndDown "><id column=" id "property=" id "jdbctype=" INTEGER "/><result column=" FILENAME " Property= "FileName" jdbctype= "VARCHAR"/> <result column= "TESTA" property= "TESTA" javatype= "byte[" "jdbctype=" BLOB "typehandler=" Org.apache.ibatis.type.BlobTypeHandler "/> <result column=" FILESTREAM "property=" FileStream "javatype=" byte[] "jdbctype=" BLOB "typehandler=" Org.apache.ibatis.type.BlobTypeHandler "/></ resultmap> <insert id= "Savefileinfo" parametertype= "Java.util.HashMap" >insert into BLOBTest (FILENAME, FILESTREAM) VALUES (#{filename}, #{byt, javatype=byte[], Jdbctype=blob, typehandler= Org.apache.ibatis.type.BlobTypeHandler}) </insert> <select id= "GETFILEBYPK" resultmap= "Filebean" parametertype= "int" > SELect * from BLOBTest WHERE Id=${value} </select></mapper> 

uploadresult.jsp
<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >

The above is a key step in the demo of uploading files under SPRINGMVC. Add support for file uploads in the spring configuration file:
<!--support uploading files--><bean id= "Multipartresolver" class= " Org.springframework.web.multipart.commons.CommonsMultipartResolver "/>

File saving is done in two ways, one is the file folder of the direct storage server, and the other is to put the file stream into the Database BLOB field (Project requirements)
Here is the code for the file download:
@ResponseBody @requestmapping (value = "/filedownload") public void FileDownload (HttpServletRequest request, HttpServletResponse response) throws IOException {String fileId = Request.getparameter ("FileId"); Fileupanddown file = FILEUPANDDOWNMAPPER.GETFILEBYPK (Integer.parseint (fileId)); byte[] FileStream = File.getfilestream (); String fileName = File.getfilename ();//Download the file Response.setcontenttype ("Application/octet-stream") in the form of a stream; Response.setheader ("Content-disposition", "attachment; Filename=\ "" + New String (Filename.getbytes ("gb2312"), "iso8859-1") + "\" "); OutputStream toclient = new BUFFEREDOUTPUTST Ream (Response.getoutputstream ()); Toclient.write (FileStream); Toclient.flush (); Toclient.close ();}

Springmvc File upload download very easy right? Don't like servlets in so much code.











Springmvc and servlets upload and download files (two ways to keep folders and store database blobs)