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Java example source code file (StaticPageUtil.java)

This example Java source code file (StaticPageUtil.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, classpathresource, component, configuration, exception, hashmap, objectmapper, staticpageutil, string, stringwriter, template, utf-8, util, version, writer

The StaticPageUtil.java Java example source code

package org.deeplearning4j.ui.standalone;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.deeplearning4j.ui.api.Component;

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateExceptionHandler;
import freemarker.template.Version;

import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.*;

/**
 * Idea: Render a set of components as a single static page.
 * The goal here is to provide a simple mechanism for exporting simple pages with static content (charts, etc),
 * where (a) the required UI components, and (b) the data itself, is embedded in the page
 *
 * This is accomplished using a simple FreeMarker template
 */
public class StaticPageUtil {

    public static String renderHTML(Component... components) throws Exception {

        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        mapper.configure(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY, true);
        mapper.enable(SerializationFeature.INDENT_OUTPUT);

        Configuration cfg = new Configuration(new Version(2, 3, 23));

        // Where do we load the templates from:
        cfg.setClassForTemplateLoading(StaticPageUtil.class, "");

        // Some other recommended settings:
        cfg.setIncompatibleImprovements(new Version(2, 3, 23));
        cfg.setDefaultEncoding("UTF-8");
        cfg.setLocale(Locale.US);
        cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);

        ClassPathResource cpr = new ClassPathResource("assets/dl4j-ui.js");
        String scriptContents = IOUtils.toString(cpr.getInputStream(),"UTF-8");

        Map<String, Object> pageElements = new HashMap<>();
        List<ComponentObject> list = new ArrayList<>();
        int i=0;
        for(Component c : components){
            list.add(new ComponentObject(String.valueOf(i), mapper.writeValueAsString(c)));
            i++;
        }
        pageElements.put("components",list);
        pageElements.put("scriptcontent",scriptContents);


        Template template = cfg.getTemplate("staticpage.ftl");
        Writer stringWriter = new StringWriter();
        template.process(pageElements,stringWriter);

        return stringWriter.toString();
    }

    public static void saveHTMLFile(String outputPath, Component... components) throws Exception {
        FileUtils.writeStringToFile(new File(outputPath), renderHTML(components));
    }
}

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