Show saved file (pdf/text/html/xml/image) content on page from database (BLOB) in ADF Application

Hello All

Previously I have posted about uploading and saving files in database blob column now this post is about showing saved file content on page using ADF Faces inline frame component

In this post I am extending same previous application, Now see how we can implement this
There are few more steps to go , See the additional steps to show file content on page-

Uploading and downloading files from database (BLOB) in Oracle ADF (12.1.3)

Hello all

This post is about a very simple requirement -file handling (uploading and downloading various types of file) in ADF and it is needed very often to store file in absolute server path (actual path) and download from there and I have posted about that previously

Uploading and downloading files from absolute server path

Now this post is about uploading and saving file in database BLOB column and downloading from there
See step by step implementation -

Uploading mulitiple files to server path in Oracle ADF using af:inputFile

Hello All :)

Previously I have posted about uploading and downloading files from server path (Refer this post for more clarification), In that post I have described the process of uploading single file at a time but sometimes we need to upload multiple files at a time and for that requirement we can use same code with little modification


So In this post we'll see that how can we upload multiple files at a time using af:inputFile, Here I am using same sample application that is used in previous post

Show uploaded file (pdf/text/html/xml/image) content on page -Oracle ADF

Hello all
In previous post
Uploading and downloading files from absolute server path in Oracle ADF (12.1.3)
we saw that how can we upload any file to absolute server path and download same from there.
Uploading part is done using simple java code to write file to specified folder and downloading part is done using <af:fileDownloadActionListener>

Now in this post i am going to show that how can we display a file on page directly without downloading it.
So for this i am using same sample application that i have used in previous post , you can download it from here



See the additional steps to show file content on page-

• Create a servlet to parse file into output stream , this output stream will be used to show file content further.
  To create servlet right click on viewController project select New--->From Gallery-->Web Tier-->Servlet











• See servlet source code to parse file into outputStream



import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;

import javax.servlet.*;
import javax.servlet.http.*;

public class PreviewFileServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=UTF-8";

    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }

    /**
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String path = (request.getParameter("path"));

        OutputStream os = response.getOutputStream();
        //If path is null
        if (path.equalsIgnoreCase("No")) {
            path = "D:\\Document\\ItemImage\\Item.jpg";
        }
        if (request.getParameter("path") == "") {
            path = "D:\\Document\\ItemImage\\Item.jpg";
        }
        InputStream inputStream = null;

        try {
            File outputFile = new File(path);
            inputStream = new FileInputStream(outputFile);
            BufferedInputStream in = new BufferedInputStream(inputStream);
            int b;
            byte[] buffer = new byte[10240];
            while ((b = in.read(buffer, 0, 10240)) != -1) {
                os.write(buffer, 0, b);
            }

        } catch (Exception e) {

            System.out.println(e);
        } finally {
            if (os != null) {
                os.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }

        }
    }
}



• Now open page in editor and drop an af:inlineFrame from component palette . inlineFrame is used to create a frame to show any external page or document just like as HTML iframe , it is loaded from source attribute
  So here i am using servlet as source attribute for this inlineFrame



<af:inlineFrame id="if2"
                                                    source="/previewfileservlet?path=#{bindings.Path.inputValue == null ? 'No' : bindings.Path.inputValue}"
                                                    inlineStyle="height:350px;width:800px;" sizing="preferred"/>


here path of document is added to pageDef bindings that is passed to servelt as parameter


• Now run this application and check it
  
  View Text File-

          View PDF File-

Thanks, Happy Learning :)

Post Related to file handling in Oracle ADF- 

Show saved file (pdf/text/html/xml/image) content on page from database (BLOB) in ADF Application
Uploading and showing image file from absolute server path -Orace ADF
Exporting viewObject data in text file using af:fileDownloadActionListener in Oracle ADF (12.1.3)
Creating pdf file using Apache PDFBox API in ADF Faces and opening it in new window -Oracle ADF
Download file from url using Oracle ADF & Java- Download Manager
Reading html source of a webpage (url) using Oracle ADF (af:richTextEditor) & Java

Uploading and showing image file from absolute server path -Orace ADF

This is another post about file handling in ADF. Previous post was about uploading and downloading any type of file from absolute server path
See-
Uploading and downloading files from absolute server path in Oracle ADF (12.1.3)

This post is specifically about handling image files, uploading an image file to server path and immediately show it on page using af:image component
So here i am using Jdev 12C (12.1.3) , see step by step implementation

• Create a fusion web application and a page in viewController






• Now drop af:inputFile (to browse and select file), af:image (to show uploaded image) and a button to upload file





• Bind af:inputFile value to managed bean variable, this variable is further used to read or write or process  file





    //To Store Value of selected file
    private UploadedFile imageFile;

    public void setImageFile(UploadedFile imageFile) {
        this.imageFile = imageFile;
    }

    public UploadedFile getImageFile() {
        return imageFile;
    }





• Now see Managed Bean method to upload image file to absolute server path

Bean Method to Upload File-




    //To Store path of uploaded Image file
    String imagePath = null;

    public void setImagePath(String imagePath) {
        this.imagePath = imagePath;
    }

    public String getImagePath() {
        return imagePath;
    }

    /**Method to upload image file to absolute server path*/
    private String uploadImage(UploadedFile file) {

        UploadedFile myfile = file;

        if (myfile == null) {

        } else {
            if (myfile.getContentType().equalsIgnoreCase("image/jpeg") ||
                myfile.getContentType().equalsIgnoreCase("image/png") ||
                myfile.getContentType().equalsIgnoreCase("image/bmp") ||
                myfile.getContentType().equalsIgnoreCase("image/gif")) {

                //Path of folder on drive
                String path = "D://ADF//";
                String type = "PNG";
                String TypeVal = ".png";
                if (myfile.getContentType().equalsIgnoreCase("image/jpeg")) {
                    type = "JPEG";
                    TypeVal = ".jpeg";
                } else if (myfile.getContentType().equalsIgnoreCase("image/png")) {
                    type = "PNG";
                    TypeVal = ".png";
                } else if (myfile.getContentType().equalsIgnoreCase("image/bmp")) {
                    type = "PNG";
                    TypeVal = ".png";
                } else if (myfile.getContentType().equalsIgnoreCase("image/gif")) {
                    type = "GIF";
                    TypeVal = ".gif";
                }

                InputStream inputStream = null;
                try {
                    //Generate a unique name for uploaded image with date time
                    DateFormat dateFormat = new SimpleDateFormat("yyMMdd_HHmmss");
                    Date date = new Date();
                    String dtTime = dateFormat.format(date);
                    dtTime = dtTime.replace(" ", "_");

                    String name = "IMG" + "_" + dtTime;
                    System.out.println("File name is-" + name);
                    inputStream = myfile.getInputStream();
                    BufferedImage input = ImageIO.read(inputStream);

                    //Writing file to path
                    File outputFile = new File(path + name + TypeVal);
                    ImageIO.write(input, type, outputFile);
                    imagePath = outputFile.getAbsolutePath();


                } catch (Exception ex) {
                    // handle exception
                    ex.printStackTrace();
                } finally {
                    try {
                        inputStream.close();
                    } catch (IOException e) {
                    }
                }
            } else {
                imagePath = "NO";
            }
        }
        setImageFile(null);
        return imagePath;
    }





ActionListener of Upload Button-




    /**Action Listener to Upload image File
     * @param actionEvent
     */
    public void uploadImageFileAction(ActionEvent actionEvent) {
        File directory = new File("D://ADF//");
        //get all the files from a directory
        File[] fList = directory.listFiles();
        for (File file : fList) {
            //Delete all previously uploaded files
            if (!"NoImage.png".equalsIgnoreCase(file.getName())) {
                file.delete();
            }

        }
        //Upload Currently Selected File
        String flag = uploadImage(imageFile);

        if ("NO".equalsIgnoreCase(flag)) {
            FacesMessage msg =
                new FacesMessage("This is not an Image file, Please upload supported file type (.jpg,.png etc)");
            msg.setSeverity(FacesMessage.SEVERITY_ERROR);
            FacesContext.getCurrentInstance().addMessage(null, msg);
        }
    }



• set usesUpload to true for af:form component on page to support file upload





• Now upload part is complete , next is to show uploaded image on page. So to do this create a servlet (this will process image file into bytes and then show using af:image component)








• See Servlet code and how it is mapped with af:image component



import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ViewImageServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=UTF-8";

    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }

    /**
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String path = (request.getParameter("path"));


        OutputStream os = response.getOutputStream();
        //If path is null or file is not an image
        if (path.equalsIgnoreCase("No")) {
            path = "D:\\ADF\\NoImage.png";
        }
        if (request.getParameter("path") == "") {
            path = "D:\\ADF\\NoImage.png";
        }
        InputStream inputStream = null;

        try {
            File outputFile = new File(path);
            inputStream = new FileInputStream(outputFile);
            BufferedInputStream in = new BufferedInputStream(inputStream);
            int b;
            byte[] buffer = new byte[10240];
            while ((b = in.read(buffer, 0, 10240)) != -1) {
                os.write(buffer, 0, b);
            }


        } catch (Exception e) {

            System.out.println(e);
        } finally {
            if (os != null) {
                os.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }

        }

    }
}






• Now run this application and check this (All uploaded files will be stored in D://ADF path)

Select an image and click upload (Image is immediately reflected on page)

Check in D://ADF folder, image file is uploaded there with a new name

Again upload another image-

Check that previous file is deleted from folder and current one is there-

Happy Learning :)

Download-Sample ADF Application

Uploading and downloading files from absolute server path in Oracle ADF (12.1.3)

Hello all
this post is about a very simple requirement -file handling (uploading and downloading various types of file) in ADF and it is needed very often to store file in absolute server path (actual path) and download from there

see step by step implementation -

• I have created a simple table in HR schema to store uploaded file name ,path and content type
See sql script for this table-

 CREATE TABLE "FILE_UPD_DWN" 
   ( "FILE_NAME" VARCHAR2(50 BYTE), 
 "PATH" VARCHAR2(100 BYTE), 
 "CONTENT_TYPE" VARCHAR2(500 BYTE)
   )



• Then prepare model using this table and drop on page as af:table, and an af:inputFile to select and upload file is used in page





• Then create a ValueChangeListener on inputFile component to upload file to an actual path on server, and after upload a row is inserted in table to keep record of uploaded files



Bean Method to Upload File-




    /**Method to upload file to actual path on Server*/
    private String uploadFile(UploadedFile file) {

        UploadedFile myfile = file;
        String path = null;
        if (myfile == null) {

        } else {
            // All uploaded files will be stored in below path
            path = "D://FileStore//" + myfile.getFilename();
            InputStream inputStream = null;
            try {
                FileOutputStream out = new FileOutputStream(path);
                inputStream = myfile.getInputStream();
                byte[] buffer = new byte[8192];
                int bytesRead = 0;
                while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
                    out.write(buffer, 0, bytesRead);
                }
                out.flush();
                out.close();
            } catch (Exception ex) {
                // handle exception
                ex.printStackTrace();
            } finally {
                try {
                    inputStream.close();
                } catch (IOException e) {
                }
            }

        }
        //Returns the path where file is stored
        return path;
    }




AMImpl method to insert record in table for Uploaded file






    /**Method to set file path and name
     * @param name
     * @param path
     */
    public void setFileData(String name, String path,String contTyp) {
        ViewObject fileVo = this.getFileUpdDwn1();
        Row newRow = fileVo.createRow();
        newRow.setAttribute("FileName", name);
        newRow.setAttribute("Path", path);
        newRow.setAttribute("ContentType", contTyp);
        fileVo.insertRow(newRow);
        this.getDBTransaction().commit();
        fileVo.executeQuery();
    }




ValueChangeListener to execute all methods -






    /*****Generic Method to Get BindingContainer**/
    public BindingContainer getBindingsCont() {
        return BindingContext.getCurrent().getCurrentBindingsEntry();
    }

    /**
     * Generic Method to execute operation
     * */
    public OperationBinding executeOperation(String operation) {
        OperationBinding createParam = getBindingsCont().getOperationBinding(operation);
        return createParam;

    }

    /**Method to Upload File ,called on ValueChangeEvent of inputFile
     * @param vce
     */
    public void uploadFileVCE(ValueChangeEvent vce) {
        if (vce.getNewValue() != null) {
            //Get File Object from VC Event
            UploadedFile fileVal = (UploadedFile) vce.getNewValue();
            //Upload File to path- Return actual server path
            String path = uploadFile(fileVal);
            System.out.println(fileVal.getContentType());
            //Method to insert data in table to keep track of uploaded files
            OperationBinding ob = executeOperation("setFileData");
            ob.getParamsMap().put("name", fileVal.getFilename());
            ob.getParamsMap().put("path", path);
            ob.getParamsMap().put("contTyp", fileVal.getContentType());
            ob.execute();
            // Reset inputFile component after upload
            ResetUtils.reset(vce.getComponent());
        }
    }



• Now run application and select files and see- 





• See uploaded files in folder





• I have seen that developers often use servlet to download and open file in browser window using HTTP response , but no need to to do this as ADF provides built in component for this <af:fileDownloadActionListener> that automatically generate http response
• Now Upload part is complete , for download functionality added a link in table column and dropped an af:fileDownloadActionListener inside link and set properties for DownloadActionListener








• See the code in Download Listener



    /**Method to download file from actual path
     * @param facesContext
     * @param outputStream
     */
    public void downloadFileListener(FacesContext facesContext, OutputStream outputStream) throws IOException {
        //Read file from particular path, path bind is binding of table field that contains path
        File filed = new File(pathBind.getValue().toString());
        FileInputStream fis;
        byte[] b;
        try {
            fis = new FileInputStream(filed);

            int n;
            while ((n = fis.available()) > 0) {
                b = new byte[n];
                int result = fis.read(b);
                outputStream.write(b, 0, b.length);
                if (result == -1)
                    break;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        outputStream.flush();
    }



• Now run application and see how Upload and download works 

Happy Learning :) Sample ADF Application

Next Post is this series - (Must Read)
Uploading mulitiple files to server path in Oracle ADF using af:inputFile
Uploading and downloading files from database (BLOB) in Oracle ADF