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Write HTML file using Java

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我寻月下人不归
我寻月下人不归 2020-11-28 23:55

I want my Java application to write HTML code in a file. Right now, I am hard coding HTML tags using java.io.BufferedWriter class. For Example:

BufferedWrite
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  • 一整个雨季
    2020-11-29 00:26

    Templates and other methods based on preliminary creation of the document in memory are likely to impose certain limits on resulting document size.

    Meanwhile a very straightforward and reliable write-on-the-fly approach to creation of plain HTML exists, based on a SAX handler and default XSLT transformer, the latter having intrinsic capability of HTML output:

    String encoding = "UTF-8";
FileOutputStream fos = new FileOutputStream("myfile.html");
OutputStreamWriter writer = new OutputStreamWriter(fos, encoding);
StreamResult streamResult = new StreamResult(writer);

SAXTransformerFactory saxFactory =
    (SAXTransformerFactory) TransformerFactory.newInstance();
TransformerHandler tHandler = saxFactory.newTransformerHandler();
tHandler.setResult(streamResult);

Transformer transformer = tHandler.getTransformer();
transformer.setOutputProperty(OutputKeys.METHOD, "html");
transformer.setOutputProperty(OutputKeys.ENCODING, encoding);
transformer.setOutputProperty(OutputKeys.INDENT, "yes");

writer.write("<!DOCTYPE html>\n");
writer.flush();
tHandler.startDocument();
    tHandler.startElement("", "", "html", new AttributesImpl());
        tHandler.startElement("", "", "head", new AttributesImpl());
            tHandler.startElement("", "", "title", new AttributesImpl());
                tHandler.characters("Hello".toCharArray(), 0, 5);
            tHandler.endElement("", "", "title");
        tHandler.endElement("", "", "head");
        tHandler.startElement("", "", "body", new AttributesImpl());
            tHandler.startElement("", "", "p", new AttributesImpl());
                tHandler.characters("5 > 3".toCharArray(), 0, 5); // note '>' character
            tHandler.endElement("", "", "p");
        tHandler.endElement("", "", "body");
    tHandler.endElement("", "", "html");
tHandler.endDocument();
writer.close();

    Note that XSLT transformer will release you from the burden of escaping special characters like >, as it takes necessary care of it by itself.

    And it is easy to wrap SAX methods like startElement() and characters() to something more convenient to one's taste...

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  • 广开言路
    2020-11-29 00:29

    if it is becoming repetitive work ; i think you shud do code reuse ! why dont you simply write functions that "write" small building blocks of HTML. get the idea? see Eg. you can have a function to which you could pass a string and it would automatically put that into a paragraph tag and present it. Of course you would also need to write some kind of a basic parser to do this (how would the function know where to attach the paragraph!). i dont think you are a beginner .. so i am not elaborating ... do tell me if you do not understand..

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  • 终归单人心
    2020-11-29 00:30

    If you are willing to use Groovy, the MarkupBuilder is very convenient for this sort of thing, but I don't know that Java has anything like it.

    http://groovy.codehaus.org/Creating+XML+using+Groovy's+MarkupBuilder

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  • 天涯浪人
    2020-11-29 00:34

    A few months ago I had the same problem and every library I found provides too much functionality and complexity for my final goal. So I end up developing my own library - HtmlFlow - that provides a very simple and intuitive API that allows me to write HTML in a fluent style. Check it here: https://github.com/fmcarvalho/HtmlFlow (it also supports dynamic binding to HTML elements)

    Here is an example of binding the properties of a Task object into HTML elements. Consider a Task Java class with three properties: Title, Description and a Priority and then we can produce an HTML document for a Task object in the following way:

    import htmlflow.HtmlView;

import model.Priority;
import model.Task;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

public class App {

    private static HtmlView<Task> taskDetailsView(){
        HtmlView<Task> taskView = new HtmlView<>();
        taskView
                .head()
                .title("Task Details")
                .linkCss("https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css");
        taskView
                .body().classAttr("container")
                .heading(1, "Task Details")
                .hr()
                .div()
                .text("Title: ").text(Task::getTitle)
                .br()
                .text("Description: ").text(Task::getDescription)
                .br()
                .text("Priority: ").text(Task::getPriority);
        return taskView;
    }

    public static void main(String [] args) throws IOException{
        HtmlView<Task> taskView = taskDetailsView();
        Task task =  new Task("Special dinner", "Have dinner with someone!", Priority.Normal);

        try(PrintStream out = new PrintStream(new FileOutputStream("Task.html"))){
            taskView.setPrintStream(out).write(task);
            Desktop.getDesktop().browse(URI.create("Task.html"));
        }
    }
}
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