"Java EE" mailbox attachment download (Whitelabel Error Page) __java

1. The question

Recently in the mailbox inside the attachment download, make it is a headache, now put the difficulties summed up; 2. Source Code

Public Emaildetail Selectemailreceiveddetail (String Mid, othersystemconfig Othersystemconfig,integer FID) {EmailLo Gin Emaillogin = new Emaillogin ();//① Create login, get parameters in link after login emailreceiveddetailconn emailreceiveddetailconn = new Emailre Ceiveddetailconn ();//② mail details Log in, get the Message Details page JSON, and then parse get requestcontext RequestContext = Emaillogin.login (othersystemconf
        IG);//③ user Login, get the context under this user, Requestcontext.globaldata ("mid", mid);
        Requestcontext.globaldata ("FID", FID); ④ the mid and fid into the GlobalData in the context of the request; Emailreceiveddetailconn.post (RequestContext)/Send request Context Emaildetail email Detail= (Emaildetail) requestcontext.globaldata ("Emailreceiveddetail"); Gets the Emailreceiveddetail entity object from the GlobalData of the request context; String urlatt=string.valueof (requestcontext.globaldata ("url");
         A URL that does not contain a SID; for (Attachments a:emaildetail.getattachments ()) {//Traverse an array of Attachments entity classes in the Emaildetail entity class; String nameencoded= Urlencoder.encode (A.getfilename (), "UTF-8");
            String location = Uploadpath + "/mail/send/" +mid+ "/" +a.getfilename (); Here A.getfilename cannot write nameencoded, otherwise will report white//file path String OutputFolder = uploadpath+ "/mail/send/" +m
            Id
            The path to the folder where the file resides connection.response Response = null; try{response= jsoup.connect (urlatt+ "&sid=" +requestcontext.globaldata ("Sid"). Cookies (requestcontext.c Ookies ()). Ignorecontenttype (True). Execute ();//The URL containing the SID, with cookies and Ignorecontenttype (true) to get the response}catch (excepti
            On e) {e.printstacktrace ();

            }//File output stream FileOutputStream out = null;
                try{//Folder File dir = new file (OutputFolder);
                if (!dir.exists ()) {//If the folder does not exist, create a new folder (with mid as the folder name) Dir.mkdirs (); {File File = new location;//file path corresponds to the files out= (new fileoutputsTream (file);//Read Out.write (Response.bodyasbytes ());//write Out.close ();//Close stream
            }catch (Exception e) {e.printstacktrace ();
            } a.seturl (parenturl+ "/upload/mail/send/" +mid+ "/" +a.getfilename ()); Here A.getfilename cannot write nameencoded, otherwise will report white//Set the URL in the attachments in Emaidetail; return Emaildet ail;//return Emaildetail entity class object}

3. Screenshot

Repeat 4. Summary

① here, you do not need to urlencoder the URL code, otherwise it will be an error, if you report the following errors, may be the reason:

②attachments attachment entity class is included in the Emaildetail, attachments set the URL (that is, the steady for loop inside a), must be after the flow closed;
③ Note that the scope of the GlobalData in the RequestContext context is available in the same request, and if a new request is made, RequestContext is updated, and the value is not taken, here, The RequestContext is saved as a key-value pair, and if the key-value pairs are written, that is write-save; If only the key is written, it is read, fetched;
④ here the ParentURL is the SCHEME+IP address of its own project;
⑤ here the Uploadpath is used to map the path to the path to save the attachment in a non project;