從數據庫中查找Image圖片並顯示。

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總體流程：創建 Image 項，從數據庫中讀取 Image ，創建臨時 Image 文件，設置 Image 屬性

1.       創建 Image 項， Image ID ：爲 HeaderImage

2.       首先我們要獲得存儲 Image 數據的 VO

    public void InitUserInfoQuery(String UserName){

        UserInfoVOImpl vo = getUserInfoVO1();

        vo.setWhereClauseParam(0, UserName);

        vo.executeQuery();

    }

public String initImg(String path){

UserInfoVOImpl vo = getUserInfoVO1();

Row row = vo.next();

String fullpath=null ;

if (row !=null)

{

BlobDomain blobdomain = (BlobDomain)row.getAttribute("HeaderImg");

if(blobdomain != null)

{

fullpath= createFile(path, blobdomain, (String)row.getAttribute("HeaderImgName"));

row.setAttribute("ImageSource", fullpath);

}

}

return fullpath;

}

這裏獲得了當前通過查詢獲得了當前 UserInfoVO 對應行所對應的存儲 Image 數據的屬性 HeaderImg 的值。

3.       然後通過讀出的值創建臨時文件

public void fromInputToOutput(InputStream inputstream, OutputStream outputstream)

    throws IOException

    {

        byte abyte0[] = new byte[255];

        for(int i = 255; i == 255;)

        {

            i = inputstream.read(abyte0);

            if(i < 0)

            break;

            outputstream.write(abyte0, 0, i);

        }

        outputstream.close();

        inputstream.close();

    }

 

    public String createFile(String s, BlobDomain blobdomain, String s1)

    {

        File file = new File(s);

        if(!file.exists())

        file.mkdirs();

        File file1 = new File(s, s1);

        System.out.println("File  Path"+file1.getPath());

        try

        {

            fromInputToOutput(blobdomain.getBinaryStream(), new FileOutputStream(file1));

        }catch(IOException ioexception)

        {

            ioexception.printStackTrace();

        }

        System.out.println("File  "+file1.getName());

        return "./fwk/t/"+ file1.getName();

     }

4.       最後在 processRequest 設置相應的屬性

OAImageBean oaimagebean=(OAImageBean)webBean.findIndexedChildRecursive("HeaderImage");

Serializable[] params = {pageContext.getTemporaryImageLocation()};

Serializable returPath= am.invokeMethod("initImg",params);

if(oaimagebean != null)

{

oaimagebean.setAttributeValue(UIConstants.SOURCE_ATTR, returPath.toString());

            oaimagebean.setWidth(120);

            oaimagebean.setHeight(120);

            oaimagebean.setBorderWidth(1);

}

總結：

難點在於臨時文件的創建，及臨時路徑的設置