build.gradle

buildscript {
    repositories {
        mavenLocal()
        maven { url "https://repo.grails.org/grails/core" }
    }
    dependencies {
        classpath "org.grails:grails-gradle-plugin:$grailsVersion"
        classpath "com.bertramlabs.plugins:asset-pipeline-gradle:2.14.1"
        classpath "org.grails.plugins:hibernate5:${gormVersion-".RELEASE"}"
    }
}

version "0.1"
group "worddocument"

apply plugin:"eclipse"
apply plugin:"idea"
apply plugin:"war"
apply plugin:"org.grails.grails-web"
apply plugin:"org.grails.grails-gsp"
apply plugin:"asset-pipeline"

repositories {
    mavenLocal()
    maven { url "https://repo.grails.org/grails/core" }
}

dependencies {


    compile "org.docx4j:docx4j-ImportXHTML:3.2.1"
    compile "org.springframework.boot:spring-boot-starter-logging"
    compile "org.springframework.boot:spring-boot-autoconfigure"
    compile "org.grails:grails-core"
    compile "org.springframework.boot:spring-boot-starter-actuator"
    compile "org.springframework.boot:spring-boot-starter-tomcat"
    compile "org.grails:grails-dependencies"
    compile "org.grails:grails-web-boot"
    compile "org.grails.plugins:cache"
    compile "org.grails.plugins:scaffolding"
    compile "org.grails.plugins:hibernate5"
    compile "org.hibernate:hibernate-core:5.1.3.Final"
    compile "org.hibernate:hibernate-ehcache:5.1.3.Final"
    console "org.grails:grails-console"
    profile "org.grails.profiles:web"
    runtime "com.bertramlabs.plugins:asset-pipeline-grails:2.14.1"
    runtime "com.h2database:h2"
    testCompile "org.grails:grails-plugin-testing"
    testCompile "org.grails.plugins:geb"
    testRuntime "org.seleniumhq.selenium:selenium-htmlunit-driver:2.47.1"
    testRuntime "net.sourceforge.htmlunit:htmlunit:2.18"
}

bootRun {
    jvmArgs('-Dspring.output.ansi.enabled=always')
    addResources = true
}


assets {
    minifyJs = true
    minifyCss = true
}

WordDocumentController.groovy

package worddocument

import org.docx4j.convert.in.xhtml.XHTMLImporterImpl
import org.docx4j.openpackaging.packages.WordprocessingMLPackage
import org.docx4j.openpackaging.parts.WordprocessingML.NumberingDefinitionsPart

import javax.servlet.ServletOutputStream

class FirstController {

    def index() {
        generatePDF(System.getProperty("user.dir") + "/sample.html", System.getProperty("user.dir") + "/html_output.doc")
    }

    private void generatePDF(String inputFilePath, String outputFilePath) {

        WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.createPackage();

        NumberingDefinitionsPart ndp = new NumberingDefinitionsPart();
        wordMLPackage.getMainDocumentPart().addTargetPart(ndp);
        ndp.unmarshalDefaultNumbering();

        XHTMLImporterImpl xHTMLImporter = new XHTMLImporterImpl(wordMLPackage);
        xHTMLImporter.setHyperlinkStyle("Hyperlink");

        if (inputFilePath.endsWith("html")) {

            wordMLPackage.getMainDocumentPart().getContent().addAll(
                    xHTMLImporter.convert(new File(inputFilePath), null) );

        }

        response.setContentType("application/msword")
        response.setHeader('Content-Disposition', 'inline; filename="WordDocument.doc"')

        ServletOutputStream outputStream = response.getOutputStream()

        wordMLPackage.save(outputStream)
        outputStream.flush()
        outputStream.close()

        // wordMLPackage.save(new File(System.getProperty("user.dir") + "/html_output.docx") );

    }
}