Java實如今線預覽–openOffice實現

實現邏輯有兩種： 
1、利用jodconverter(基於OpenOffice服務)將文件(.doc、.docx、.xls、.ppt)轉化爲html格式。 
2、利用jodconverter(基於OpenOffice服務)將文件(.doc、.docx、.xls、.ppt)轉化爲pdf格式。 
轉換成html格式你們都能理解，這樣就能夠直接在瀏覽器上查看了，也就實現了在線預覽的功能；轉換成pdf格式這點，須要用戶安裝了Adobe Reader XI，這樣你會發現把pdf直接拖到瀏覽器頁面能夠直接打開預覽，這樣也就實現了在線預覽的功能。

 

將文件轉化爲html格式或者pdf格式

話很少說，直接上代碼。

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)將文件(*.doc、*.docx、*.xls、*.ppt)轉化爲html格式或者pdf格式，
 * 使用前請檢查OpenOffice服務是否已經開啓, OpenOffice進程名稱：soffice.exe | soffice.bin
 * 
 * @author yjclsx
 */
public class Doc2HtmlUtil {

    private static Doc2HtmlUtil doc2HtmlUtil;

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

    /**
     * 轉換文件成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構建輸入文件
         */
        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("文件轉換出錯，請檢查OpenOffice服務是否啓動。");
        }
        // convert
        DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
        converter.convert(docInputFile, htmlOutputFile);
        connection.disconnect();
        // 轉換完以後刪除word文件
        docInputFile.delete();
        return htmFileName;
    }

    /**
     * 轉換文件成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構建輸入文件
         */
        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("文件轉換出錯，請檢查OpenOffice服務是否啓動。");
        }
        // convert
        DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
        converter.convert(docInputFile, htmlOutputFile);
        connection.disconnect();
        // 轉換完以後刪除word文件
        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的過程幾乎同樣，只是在建立輸出的File時前者命名爲XXX.html，後者命名爲XXX.pdf，在執行converter.convert(docInputFile, htmlOutputFile);時，jodconverter會本身根據文件類型名轉換成對應的文件。 
注意，main方法裏別file2Html和file2pdf都調用，會報錯的，要麼轉html，要麼轉pdf，只能選一個。還有就是在執行以前，須要啓動openOffice的服務：在openOffice目錄下的命令窗口中執行soffice -headless -accept=」socket,host=127.0.0.1,port=8100;urp;」 -nofirststartwizard便可啓動。 
以上須要引入jodconverter的jar包。