Работаю с Java , Java Spring Boot , Thymeleaf , Java Spring Framework , jquery , Javascript , .NET , ASP.NET , Qt , STL.
Пример PDF Creator for users , it can be transformed to any data type:
import java.awt.Color;
import java.io.IOException;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import com.lowagie.text.Document;
import com.lowagie.text.Font;
import com.lowagie.text.FontFactory;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Phrase;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfWriter;
import com.luxuryattributes.common.entity.User;


public class UserPdfExporter extends AbstractExporter {

public void export(List<User> listUsers, HttpServletResponse response) throws IOException {
super.setResponseHeader(response, "application/pdf", ".pdf", "users_");

Document document = new Document(PageSize.A4);
PdfWriter.getInstance(document, response.getOutputStream());

document.open();

Font font = FontFactory.getFont(FontFactory.HELVETICA_BOLD);
font.setSize(18);
font.setColor(Color.BLUE);

Paragraph paragraph = new Paragraph("List of User", font);
paragraph.setAlignment(Paragraph.ALIGN_CENTER);

document.add(paragraph);

PdfPTable table = new PdfPTable(6);
table.setWidthPercentage(100f);
table.setSpacingBefore(10);
table.setWidths(new float[] {1.2f, 3.5f, 3.0f, 3.0f, 3.0f, 1.7f});

writeTableHeader(table);
writeTableData(table, listUsers);

document.add(table);

document.close();

}

private void writeTableData(PdfPTable table, List<User> listUsers) {
for (User user : listUsers) {
table.addCell(String.valueOf(user.getId()));
table.addCell(user.getEmail());
table.addCell(user.getFirstName());
table.addCell(user.getLastName());
table.addCell(user.getRoles().toString());
table.addCell(String.valueOf(user.isEnabled()));
}
}

private void writeTableHeader(PdfPTable table) {
PdfPCell cell = new PdfPCell();
cell.setBackgroundColor(Color.BLUE);
cell.setPadding(5);

Font font = FontFactory.getFont(FontFactory.HELVETICA);
font.setColor(Color.WHITE);

cell.setPhrase(new Phrase("ID", font));
table.addCell(cell);

cell.setPhrase(new Phrase("E-mail", font));
table.addCell(cell);

cell.setPhrase(new Phrase("First Name", font));
table.addCell(cell);

cell.setPhrase(new Phrase("Last Name", font));
table.addCell(cell);

cell.setPhrase(new Phrase("Roles ", font));
table.addCell(cell);

cell.setPhrase(new Phrase("Enabled", font));
table.addCell(cell);
}

}
Небольшой пример с jquery : Quantity Control Function:
$(document).ready(function() {
$(".linkMinus").on("click", function(evt) {
evt.preventDefault();
productId = $(this).attr("pid");
quantityInput = $("#quantity" + productId);
newQuantity = parseInt(quantityInput.val()) - 1;

if (newQuantity > 0) {
quantityInput.val(newQuantity);
} else {
showWarningModal('Minimum quantity is 1');
}
});

$(".linkPlus").on("click", function(evt) {
evt.preventDefault();
productId = $(this).attr("pid");
quantityInput = $("#quantity" + productId);
newQuantity = parseInt(quantityInput.val()) + 1;

if (newQuantity <= 5) {
quantityInput.val(newQuantity);
} else {
showWarningModal('Maximum quantity is 5');
}
});
});
Unit Test Example (With Mock):
@Test
@WithMockUser(username = "someuser@mail.ru", password = "somepassword", roles = "admin")
public void testCreateCountry() throws JsonProcessingException, Exception {
String url = "/countries/save";
String countryName = "Great Britain";
String countryCode = "UK";
Country country = new Country(countryName, countryCode);
MvcResult result = mockMvc.perform(post(url).contentType("application/json")
.content(objectMapper.writeValueAsString(country))
.with(csrf()))
.andDo(print())
.andExpect(status().isOk())
.andReturn();
String response = result.getResponse().getContentAsString();
Integer countryId = Integer.parseInt(response);
Optional<Country> findById = repo.findById(countryId);
assertThat(findById.isPresent());
Country savedCountry = findById.get();
assertThat(savedCountry.getName()).isEqualTo(countryName);
}