1. Provide the download service for the logged-in user.
2. Block access to the download only by entering the URL.
File Download OverviewIn order to send the file to the browser, we need to do the following in the controller:
Packagedomain; Public classLogin {PrivateString username; PrivateString password; PublicString GetUserName () {returnusername; } Public voidSetusername (String username) { This. Username =username; } PublicString GetPassword () {returnpassword; } Public voidSetPassword (String password) { This. Password =password; }}Controller controllers
PackageController;Importdomain. Login;ImportOrg.apache.commons.logging.Log;Importorg.apache.commons.logging.LogFactory;ImportOrg.springframework.stereotype.Controller;ImportOrg.springframework.ui.Model;ImportOrg.springframework.web.bind.annotation.ModelAttribute;Importorg.springframework.web.bind.annotation.RequestMapping;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse;Importjavax.servlet.http.HttpSession;ImportJava.io.*; @Controller Public classResourcecontroller {Private Static FinalLog logger = Logfactory.getlog (Resourcecontroller.class); @RequestMapping (Value= "/login") PublicString Login (@ModelAttribute login login, HttpSession session, model model) {Model.addattribute ("Login",NewLogin ()); if("MS". Equals (Login.getusername ()) && "123". Equals (Login.getpassword ())) {Session.setattribute ("LoggedIn", boolean.true); return"Main"; } Else { return"LoginForm"; }} @RequestMapping (Value= "/resource_download") PublicString Downloadresource (HttpSession session, HttpServletRequest request, httpservletresponse response) {
if(session==NULL|| Session.getattribute ("loggedIn") = =NULL) { return"LoginForm"; } String dataDirectory= Request.getservletcontext (). Getrealpath ("/web-inf/data"); File File=NewFile (DataDirectory, "Blog.zip"); if(File.exists ()) {Response.setcontenttype ("Application/octet-stream"); Response.AddHeader ("Content-disposition", "Attachment;filename=blog.zip"); byte[] buffer =New byte[1024]; FileInputStream FIS=NULL; Bufferedinputstream bis=NULL; Try{FIS=Newfileinputstream (file); Bis=NewBufferedinputstream (FIS); OutputStream OS=Response.getoutputstream (); inti =bis.read (buffer); while(I!=-1) {os.write (buffer,0, i); I=bis.read (buffer); } } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }finally { Try{bis.close (); } Catch(IOException e) {e.printstacktrace (); } Try{fis.close (); } Catch(IOException e) {e.printstacktrace (); } } } return NULL; }}Writing views
main.jsp
<%@ Page ContentType="Text/html;charset=utf-8"language="Java" %><HTML><Head> <title>Downpage</title></Head><Body> <h4>Click the link to download the file</h4> <P> <ahref= "Resource_download" >Down</a> </P></Body></HTML>
loginform.jsp
<%@ Page ContentType="Text/html;charset=utf-8"language="Java" %><HTML><Head> <title>Login Page</title></Head><Body> <Form:formCommandName= "Login"Action= "Login"Method= "POST">Account Number:<BR> <Form:inputPath= "username"Csserrorclass= "Error"ID= "username"/> <BR>Password:<BR> <Form:inputPath= "Password"Csserrorclass= "Error"ID= "Password"/> <BR> <inputtype= "Submit"value= "Submit"> </Form:form></Body></HTML>Case 2: block access to downloads by simply entering a URL
@RequestMapping (value = "/resource_download") PublicString Downloadresource (HttpSession session, HttpServletRequest request, httpservletresponse response,@ Requestheader String Refuer ) { if(refer==null )//By judging the refer to the browser input URL can download the picture of the situation {return"LoginForm"; } String dataDirectory= Request.getservletcontext (). Getrealpath ("/web-inf/data"); File File=NewFile (DataDirectory, "Blog.zip"); if(File.exists ()) {Response.setcontenttype ("Application/octet-stream"); Response.AddHeader ("Content-disposition", "Attachment;filename=blog.zip"); byte[] buffer =New byte[1024]; FileInputStream FIS=NULL; Bufferedinputstream bis=NULL; Try{FIS=Newfileinputstream (file); Bis=NewBufferedinputstream (FIS); OutputStream OS=Response.getoutputstream (); inti =bis.read (buffer); while(I!=-1) {os.write (buffer,0, i); I=bis.read (buffer); } } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }finally { Try{bis.close (); } Catch(IOException e) {e.printstacktrace (); } Try{fis.close (); } Catch(IOException e) {e.printstacktrace (); } } } return NULL; }}
SPRINGMVC: Study Notes (9)--File download
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