Spring MVC - View Examples

    @Bean("simpleView")
    public View myCustomView() {
        return new MyCustomView();
    }

import org.springframework.web.servlet.View;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.util.Map;

public class MyCustomView implements View {

    @Override
    public String getContentType() {
        return "text/html";
    }

    @Override
    public void render(Map<String, ?> model, HttpServletRequest request,
                       HttpServletResponse response) throws Exception {
        response.setContentType(getContentType());
        PrintWriter writer = response.getWriter();
        writer.println("This is my custom dummy view.<br/>");
        writer.println("<h3>Model attributes</h3>");
        for (Map.Entry<String, ?> entry : model.entrySet()) {
            writer.printf("%s = %s<br/>", entry.getKey(), entry.getValue());
        }
    }
}

import com.itextpdf.io.font.FontConstants;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.view.AbstractView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.util.Map;

@Component("reportView")
public class ReportPdfView extends AbstractView {

    @Override
    protected void renderMergedOutputModel(Map<String, Object> model,
                                           HttpServletRequest request,
                                           HttpServletResponse response) throws Exception {
        response.setHeader("Content-Disposition", "attachment; filename=myReport.pdf");
        Report report = (Report) model.get("report");

        //IText API
        PdfWriter pdfWriter = new PdfWriter(response.getOutputStream());
        PdfDocument pdf = new PdfDocument(pdfWriter);
        Document pdfDocument = new Document(pdf);

        //title
        Paragraph title = new Paragraph(report.getName());
        title.setFont(PdfFontFactory.createFont(FontConstants.HELVETICA));
        title.setFontSize(18f);
        title.setItalic();
        pdfDocument.add(title);

        //date
        Paragraph date = new Paragraph(report.getDate().format(
                DateTimeFormatter.ofLocalizedDate(FormatStyle.FULL)));
        date.setFontSize(16f);
        pdfDocument.add(date);

        //content
        Paragraph content = new Paragraph(report.getContent());
        pdfDocument.add(content);

        pdfDocument.close();
    }
}

import net.sf.jasperreports.engine.*;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.HtmlExporter;
import net.sf.jasperreports.export.SimpleExporterInput;
import net.sf.jasperreports.export.SimpleHtmlExporterOutput;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.view.AbstractView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.util.List;
import java.util.Map;

@Component("forexView")
public class CurrencyRateHtmlView extends AbstractView {
    private JasperReport currencyRatesReport;

    @Override
    protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request,
                                           HttpServletResponse response) throws Exception {
        response.setContentType("text/html");
        List<CurrencyRate> rates = (List<CurrencyRate>) model.get("todayCurrencyRates");
        //data source
        JRDataSource dataSource = getDataSource(rates);
        //compile jrxml template and get report
        JasperReport report = getReport();
        //fill the report with data source objects
        JasperPrint jasperPrint = JasperFillManager.fillReport(report, null, dataSource);
        //export to html
        HtmlExporter exporter = new HtmlExporter(DefaultJasperReportsContext.getInstance());
        exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
        exporter.setExporterOutput(new SimpleHtmlExporterOutput(response.getWriter()));
        exporter.exportReport();
    }

    private JRDataSource getDataSource(List<CurrencyRate> rates) {
        JRBeanCollectionDataSource dataSource = new JRBeanCollectionDataSource(rates);
        return dataSource;
    }

    public JasperReport getReport() throws JRException {
        if (currencyRatesReport == null) {//compile only once lazily
            InputStream stream = getClass().getResourceAsStream("/rates.jrxml");
            currencyRatesReport = JasperCompileManager.compileReport(stream);
        }
        return currencyRatesReport;
    }
}

    @Bean("currencyRateView")
    public View jsonView() {
        MappingJackson2JsonView view = new MappingJackson2JsonView();
        return view;
    }