<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springboot-demo</artifactId>
        <groupId>com.et</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>tika</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.tika</groupId>
            <artifactId>tika-parsers</artifactId>
            <version>1.17</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

    </dependencies>
</project>

package com.et.tika.controller;

import com.et.tika.convertor.WordToHtmlConverter;
import com.et.tika.dto.ConvertedDocumentDTO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.util.HashMap;
import java.util.Map;

@RestController
@Slf4j
public class HelloWorldController {
    @RequestMapping("/hello")
    public Map<String, Object> showHelloWorld(){
        Map<String, Object> map = new HashMap<>();
        map.put("msg", "HelloWorld");
        return map;
    }
    @Autowired
    WordToHtmlConverter converter;



    /**
     * Transforms the Word document into HTML document and returns the transformed document.
     *
     * @return  The content of the uploaded document as HTML.
     */
    @RequestMapping(value = "/api/word-to-html", method = RequestMethod.POST)
    public ConvertedDocumentDTO convertWordDocumentIntoHtmlDocument(@RequestParam(value = "file", required = true) MultipartFile wordDocument) {
        log.info("Converting word document into HTML document");

        ConvertedDocumentDTO htmlDocument = converter.convertWordDocumentIntoHtml(wordDocument);

        log.info("Converted word document into HTML document.");
        log.trace("The created HTML markup looks as follows: {}", htmlDocument);

        return htmlDocument;
    }
}

package com.et.tika.convertor;


import com.et.tika.dto.ConvertedDocumentDTO;
import com.et.tika.exception.DocumentConversionException;
import lombok.extern.slf4j.Slf4j;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.apache.tika.parser.microsoft.ooxml.OOXMLParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import org.xml.sax.SAXException;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.TransformerException;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;

/**
 *
 */
@Component
@Slf4j
public class WordToHtmlConverter {


    /**
     * Converts a .docx document into HTML markup. This code
     * is based on <a  rel="external nofollow" >this StackOverflow</a> answer.
     *
     * @param wordDocument  The converted .docx document.
     * @return
     */
    public ConvertedDocumentDTO convertWordDocumentIntoHtml(MultipartFile wordDocument) {
        log.info("Converting word document: {} into HTML", wordDocument.getOriginalFilename());
        try {
            InputStream input = wordDocument.getInputStream();
            Parser parser = new OOXMLParser();

            StringWriter sw = new StringWriter();
            SAXTransformerFactory factory = (SAXTransformerFactory)
                    SAXTransformerFactory.newInstance();
            TransformerHandler handler = factory.newTransformerHandler();
            handler.getTransformer().setOutputProperty(OutputKeys.ENCODING, "utf-8");
            handler.getTransformer().setOutputProperty(OutputKeys.METHOD, "html");
            handler.getTransformer().setOutputProperty(OutputKeys.INDENT, "yes");
            handler.setResult(new StreamResult(sw));

            Metadata metadata = new Metadata();
            metadata.add(Metadata.CONTENT_TYPE, "text/html;charset=utf-8");
            parser.parse(input, handler, metadata, new ParseContext());
            return new ConvertedDocumentDTO(wordDocument.getOriginalFilename(), sw.toString());
        }
        catch (IOException | SAXException | TransformerException | TikaException ex) {
            log.error("Conversion failed because an exception was thrown", ex);
            throw new DocumentConversionException(ex.getMessage(), ex);
        }
    }
}

package com.et.tika.dto;

import org.apache.commons.lang.builder.ToStringBuilder;

/**
 *
 */
public  class ConvertedDocumentDTO {

    private final String contentAsHtml;
    private final String filename;

    public ConvertedDocumentDTO(String filename, String contentAsHtml) {
        this.contentAsHtml = contentAsHtml;
        this.filename = filename;
    }

    public String getContentAsHtml() {
        return contentAsHtml;
    }

    public String getFilename() {
        return filename;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this)
                .append("filename", this.filename)
                .append("contentAsHtml", this.contentAsHtml)
                .toString();
    }
}

package com.et.tika.exception;

/**
 *
 */
public final class DocumentConversionException extends RuntimeException {

    public DocumentConversionException(String message, Exception ex) {
        super(message, ex);
    }
}