转换数据库中的嵌入式图片 [英] Convert embedded pictures in database

问题描述

我有一个小"问题.在数据库文件中包含一个richtextfield. richtextfield包含某个联系人的个人资料图片.问题在于此内容未另存为mime，因此无法计算图像的url.

I have a 'small' problem. In a database documents contain a richtextfield. The richtextfield contains a profile picture of a certain contact. The problem is that this content is not saved as mime and therefore I can not calculate the url of the image.

我正在使用pojo从人员个人资料中检索数据，并在我的xpage控件中使用它来显示其内容.我需要构建一个转换代理，该代理将richtextitem的内容转换为mime以便能够计算类似

I'm using a pojo to retrieve data from the person profile and use this in my xpage control to display its contents. I need to build a convert agent which takes the content of the richtextitem and converts it to mime to be able to calculate the url something like

http://host/database.nsf/($users)/D40FE4181F2B86CCC12579AB0047BD22/Photo/M2?OpenElement

有人可以帮助我将richtextitem的内容转换为mime吗?当我在rt字段中检查嵌入式对象时，没有对象.当我以流的形式获取字段的内容，并使用以下代码将其保存到新的Richtext字段中时.但是，新领域并不是以某种方式创建的.

Could someone help me with converting the contents of the richtextitem to mime? When I check for embedded objects in the rt field there are none. When I get the content of the field as stream and save it to a new richtext field using the following code. But the new field is not created somehow.

System.out.println("check if document contains a field with name "+fieldName);
        if(!doc.hasItem(fieldName)){
            throw new PictureConvertException("Could not locate richtextitem with name"+fieldName);
        }


        RichTextItem pictureField = (RichTextItem) doc.getFirstItem(fieldName);

        System.out.println("Its a richtextfield..");
        System.out.println("Copy field to backup field");

        if(doc.hasItem("old_"+fieldName)){

            doc.removeItem("old_"+fieldName);

        }


        pictureField.copyItemToDocument(doc, "old_"+fieldName);     

//      Vector embeddedPictures = pictureField.getEmbeddedObjects();
//      System.out.println(doc.hasEmbedded());
//      System.out.println("Retrieved embedded objects");
//      if(embeddedPictures.isEmpty()){
//          throw new PictureConvertException("No embedded objects could be found.");
//      }
//      


//      EmbeddedObject photo = (EmbeddedObject) embeddedPictures.get(0);
        System.out.println("Create inputstream");

        //s.setConvertMime(false);
        InputStream iStream = pictureField.getInputStream();
        System.out.println("Create notesstream");
        Stream nStream = s.createStream();
        nStream.setContents(iStream);

        System.out.println("Create mime entity");

        MIMEEntity mEntity = doc.createMIMEEntity("PictureTest");
        MIMEHeader cdheader = mEntity.createHeader("Content-Disposition");
        System.out.println("Set header withfilename picture.gif");

        cdheader.setHeaderVal("attachment;filename=picture.gif");
        System.out.println("Setcontent type header");
        MIMEHeader cidheader = mEntity.createHeader("Content-ID");
        cidheader.setHeaderVal("picture.gif");
        System.out.println("Set content from stream");
        mEntity.setContentFromBytes(nStream, "application/gif", mEntity.ENC_IDENTITY_BINARY);
        System.out.println("Save document..");

        doc.save();
        //s.setConvertMime(true);


        System.out.println("Done");

        // Clean up if we are done..

        //doc.removeItem(fieldName);

推荐答案

已经有一段时间了，我没有沿着将现有数据转换成mime的路线走.我无法使其正常工作，经过更多研究后，似乎没有必要.因为问题是关于显示绑定到Richtextbox的图像，所以我对如何计算图像的url进行了一些研究，并提出了以下代码行:

Its been a little while now and I didn't go down the route of converting existing data to mime. I could not get it to work and after some more research it seemed to be unnecessary. Because the issue is about displaying images bound to a richtextbox I did some research on how to compute the url for an image and I came up with the following lines of code:

function getImageURL(doc:NotesDocument, strRTItem,strFileType){
    if(doc!=null && !"".equals(strRTItem)){
        var rtItem = doc.getFirstItem(strRTItem);
        if(rtItem!=null){
            var personelDB = doc.getParentDatabase();
            var dbURL = getDBUrl(personelDB);
            var imageURL:java.lang.StringBuffer = new java.lang.StringBuffer(dbURL);

            if("file".equals(strFileType)){
                var embeddedObjects:java.util.Vector = rtItem.getEmbeddedObjects();
                if(!embeddedObjects.isEmpty()){
                    var file:NotesEmbeddedObject = embeddedObjects.get(0); 

                    imageURL.append("(lookupView)\\");
                    imageURL.append(doc.getUniversalID());
                    imageURL.append("\\$File\\");
                    imageURL.append(file.getName());
                    imageURL.append("?Open");

                }
            }else{              
                imageURL.append(doc.getUniversalID());
                imageURL.append("/"+strRTItem+"/");
                if(rtItem instanceof lotus.domino.local.RichTextItem){
                    imageURL.append("0.C4?OpenElement");
                }else{
                    imageURL.append("M2?OpenElement");
                }
            }
            return imageURL.toString()
        }
    }
}

它将检查是否存在给定的RT字段.在这种情况下，它假设一些事情:

It will check if a given RT field is present. If this is the case it assumes a few things:

• 如果rtfield中有文件，则第一个文件是要显示的图片
• 否则，如果该项目的类型为Rt，它将创建一个指定的url，否则它将假定它是mime实体并生成另一个url.

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