How to save data between methods

How to save data between methods

By : Vicki Farmere
Date : November 28 2020, 04:01 AM
will be helpful for those in need I have a controller that creates many images from pdf(pdfBox).I save all picture to List . And I need to send one picture per view when I press the button. or enter value , This might helps you:
code :
private static Map<Integer, String> pictureMap = new HashMap<>();
private static PDF pdf;

public ResponseEntity<?> CreateFont(int pictureNumber) {
        return response(pictureMap.get(pictureNumber));
    if(pdf == null)
        pdf = new PDF();
    PdfToImg pdfToImg = new PdfToImg();
    List<byte[]> fileBytes = pdfToImg.getImage(pdf.PDFCREATE());
    byte[] encoded = Base64.encodeBase64(fileBytes.get(pictureNumber));
    String encodedString = new String(encoded);
    pictureMap.put(pictureNumber, encodedString);

    return response(encodedString);

private ResponseEntity response(String encodedString){
    return new ResponseEntity<String>(
        "<img src='data:image/jpeg;base64," + encodedString + "' alt='' width='420' height='580'>",

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Core Data NSManagedObject Insert and Save Methods

Core Data NSManagedObject Insert and Save Methods

By : ken li
Date : March 29 2020, 07:55 AM
will help you Is there an easier way to do something like the following in Core Data: , Check out
What are good methods for save Java application data?

What are good methods for save Java application data?

By : Laurand
Date : March 29 2020, 07:55 AM
With these it helps For really simple data storage needs you can just use the java File Writer library for writing simple primitive data types to a file, then when you need to retrieve the data just use the File Reader Library. This is about as simple as you can get with storing data with java. If that is to simple, then I would suggest look at serializing your data objects and writing them to a file instead. Here's a link, discusses the merits of object Serialization.
advising all delete and save methods in spring-data-jpa

advising all delete and save methods in spring-data-jpa

By : Trey Royall
Date : March 29 2020, 07:55 AM
To fix this issue I got it working as @sheltem suggested. I used EntityListeners. In my case I needed access to a spring bean and was able to it this way:
code :
public class PublishEntityListener {

    private static PublishingService publishingService;

            required = true)
    public void setPublishingService(PublishingService publishingService) {
        this.publishingService = publishingService;

    public void init() {
        //Allow the static dependency to be setup post construct as @EntityListeners are no spring managed

    public void prePersist(DomainObject<?> entity) {
        publishingService.publish(getTopicName(entity), HttpMethod.POST, entity);

    public void preUpdate(DomainObject<?> entity) {
        publishingService.publish(getTopicName(entity), HttpMethod.PUT, entity);

    public void onDelete(DomainObject<?> entity) {
        publishingService.publish(getTopicName(entity), HttpMethod.DELETE, entity);

Python Numpy, methods of save data and variables

Python Numpy, methods of save data and variables

By : shahriyar jamali kap
Date : March 29 2020, 07:55 AM
With these it helps numpy.save puts your array on disk in binary format.
numpy.savetxt writes in plain text so it is human-readable but takes more space.
Sharing data between Mongoose middleware methods pre save and post save

Sharing data between Mongoose middleware methods pre save and post save

By : Chesus
Date : March 29 2020, 07:55 AM
wish of those help Ok, The first part of your question is correctly answered by Avraam Mavridis so I will only focus on your last update in the question.
pre.save actually doesn't hold the actual document that currently exixts in the database, instead it is the document which is going to be saved, and contains the changes done to the document, i.e. the updated document.
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