Java實現線上預覽–openOffice實現

簡介

之前有寫了poi實現線上預覽的文章，裡面也說到了使用openOffice也可以做到，這裡就詳細介紹一下。
我的實現邏輯有兩種：
一、利用jodconverter(基於OpenOffice服務)將檔案(.doc、.docx、.xls、.ppt)轉化為html格式。
二、利用jodconverter(基於OpenOffice服務)將檔案(.doc、.docx、.xls、.ppt)轉化為pdf格式。
轉換成html格式大家都能理解，這樣就可以直接在瀏覽器上查看了，也就實現了線上預覽的功能；轉換成pdf格式這點，需要使用者安裝了Adobe Reader XI，這樣你會發現把pdf直接拖到瀏覽器頁面可以直接開啟預覽，這樣也就實現了線上預覽的功能。

將檔案轉化為html格式或者pdf格式

話不多說，直接上程式碼。

package com.pdfPreview.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ConnectException;
import java.text.SimpleDateFormat;
import
 
 java.util.Date;

import com.artofsolving.jodconverter.DocumentConverter;
import com.artofsolving.jodconverter.openoffice.connection.OpenOfficeConnection;
import com.artofsolving.jodconverter.openoffice.connection.SocketOpenOfficeConnection;
import com.artofsolving.jodconverter.openoffice.converter.OpenOfficeDocumentConverter;
/**
 * 利用jodconverter(基於OpenOffice服務)將檔案(*.doc、*.docx、*.xls、*.ppt)轉化為html格式或者pdf格式，
 * 使用前請檢查OpenOffice服務是否已經開啟, OpenOffice程序名稱：soffice.exe | soffice.bin
 * 
 * @author
 
 yjclsx
 */
public class Doc2HtmlUtil {

    private static Doc2HtmlUtil doc2HtmlUtil;

    /**
     * 獲取Doc2HtmlUtil例項
     */
    public static synchronized Doc2HtmlUtil getDoc2HtmlUtilInstance() {
        if (doc2HtmlUtil == null) {
            doc2HtmlUtil = new Doc2HtmlUtil();
        }
        return doc2HtmlUtil;
    }

    /**
     * 轉換檔案成html
     * 
     * @param fromFileInputStream:
     * @throws IOException 
     */
    public String file2Html(InputStream fromFileInputStream, String toFilePath,String type) throws IOException {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String timesuffix = sdf.format(date);
        String docFileName = null;
        String htmFileName = null;
        if("doc".equals(type)){
            docFileName = "doc_" + timesuffix + ".doc";
            htmFileName = "doc_" + timesuffix + ".html";
        }else if("docx".equals(type)){
            docFileName = "docx_" + timesuffix + ".docx";
            htmFileName = "docx_" + timesuffix + ".html";
        }else if("xls".equals(type)){
            docFileName = "xls_" + timesuffix + ".xls";
            htmFileName = "xls_" + timesuffix + ".html";
        }else if("ppt".equals(type)){
            docFileName = "ppt_" + timesuffix + ".ppt";
            htmFileName = "ppt_" + timesuffix + ".html";
        }else{
            return null;
        }

        File htmlOutputFile = new File(toFilePath + File.separatorChar + htmFileName);
        File docInputFile = new File(toFilePath + File.separatorChar + docFileName);
        if (htmlOutputFile.exists())
            htmlOutputFile.delete();
        htmlOutputFile.createNewFile();
        if (docInputFile.exists())
            docInputFile.delete();
        docInputFile.createNewFile();
        /**
         * 由fromFileInputStream構建輸入檔案
         */
        try {
            OutputStream os = new FileOutputStream(docInputFile);
            int bytesRead = 0;
            byte[] buffer = new byte[1024 * 8];
            while ((bytesRead = fromFileInputStream.read(buffer)) != -1) {
                os.write(buffer, 0, bytesRead);
            }

            os.close();
            fromFileInputStream.close();
        } catch (IOException e) {
        }

        OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100);
        try {
            connection.connect();
        } catch (ConnectException e) {
            System.err.println("檔案轉換出錯，請檢查OpenOffice服務是否啟動。");
        }
        // convert
        DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
        converter.convert(docInputFile, htmlOutputFile);
        connection.disconnect();
        // 轉換完之後刪除word檔案
        docInputFile.delete();
        return htmFileName;
    }

    /**
     * 轉換檔案成pdf
     * 
     * @param fromFileInputStream:
     * @throws IOException 
     */
    public String file2pdf(InputStream fromFileInputStream, String toFilePath,String type) throws IOException {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String timesuffix = sdf.format(date);
        String docFileName = null;
        String htmFileName = null;
        if("doc".equals(type)){
            docFileName = "doc_" + timesuffix + ".doc";
            htmFileName = "doc_" + timesuffix + ".pdf";
        }else if("docx".equals(type)){
            docFileName = "docx_" + timesuffix + ".docx";
            htmFileName = "docx_" + timesuffix + ".pdf";
        }else if("xls".equals(type)){
            docFileName = "xls_" + timesuffix + ".xls";
            htmFileName = "xls_" + timesuffix + ".pdf";
        }else if("ppt".equals(type)){
            docFileName = "ppt_" + timesuffix + ".ppt";
            htmFileName = "ppt_" + timesuffix + ".pdf";
        }else{
            return null;
        }

        File htmlOutputFile = new File(toFilePath + File.separatorChar + htmFileName);
        File docInputFile = new File(toFilePath + File.separatorChar + docFileName);
        if (htmlOutputFile.exists())
            htmlOutputFile.delete();
        htmlOutputFile.createNewFile();
        if (docInputFile.exists())
            docInputFile.delete();
        docInputFile.createNewFile();
        /**
         * 由fromFileInputStream構建輸入檔案
         */
        try {
            OutputStream os = new FileOutputStream(docInputFile);
            int bytesRead = 0;
            byte[] buffer = new byte[1024 * 8];
            while ((bytesRead = fromFileInputStream.read(buffer)) != -1) {
                os.write(buffer, 0, bytesRead);
            }

            os.close();
            fromFileInputStream.close();
        } catch (IOException e) {
        }

        OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100);
        try {
            connection.connect();
        } catch (ConnectException e) {
            System.err.println("檔案轉換出錯，請檢查OpenOffice服務是否啟動。");
        }
        // convert
        DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
        converter.convert(docInputFile, htmlOutputFile);
        connection.disconnect();
        // 轉換完之後刪除word檔案
        docInputFile.delete();
        return htmFileName;
    }

    public static void main(String[] args) throws IOException {
        Doc2HtmlUtil coc2HtmlUtil = getDoc2HtmlUtilInstance();
        File file = null;
        FileInputStream fileInputStream = null;

        file = new File("D:/poi-test/exportExcel.xls");
        fileInputStream = new FileInputStream(file);
//      coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/xls","xls");
        coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/xls","xls");

        file = new File("D:/poi-test/test.doc");
        fileInputStream = new FileInputStream(file);
//      coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/doc","doc");
        coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/doc","doc");

        file = new File("D:/poi-test/週報模版.ppt");
        fileInputStream = new FileInputStream(file);
//      coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/ppt","ppt");
        coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/ppt","ppt");

        file = new File("D:/poi-test/test.docx");
        fileInputStream = new FileInputStream(file);
//      coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/docx","docx");
        coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/docx","docx");

    }

}

轉換成html和轉換成pdf的過程幾乎一樣，只是在建立輸出的File時前者命名為XXX.html，後者命名為XXX.pdf，在執行converter.convert(docInputFile, htmlOutputFile);時，jodconverter會自己根據檔案型別名轉換成對應的檔案。
注意，main方法裡別file2Html和file2pdf都呼叫，會報錯的，要麼轉html，要麼轉pdf，只能選一個。還有就是在執行之前，需要啟動openOffice的服務：在openOffice目錄下的命令視窗中執行soffice -headless -accept=”socket,host=127.0.0.1,port=8100;urp;” -nofirststartwizard即可啟動。
以上需要引入jodconverter的jar包。

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