Java实现在线预览–openOffice实现

实现逻辑有两种： 
一、利用jodconverter(基于OpenOffice服务)将文件(.doc、.docx、.xls、.ppt)转化为html格式。 
二、利用jodconverter(基于OpenOffice服务)将文件(.doc、.docx、.xls、.ppt)转化为pdf格式。 
转换成html格式大家都能理解，这样就可以直接在浏览器上查看了，也就实现了在线预览的功能；转换成pdf格式这点，需要用户安装了Adobe Reader XI，这样你会发现把pdf直接拖到浏览器页面可以直接打开预览，这样也就实现了在线预览的功能。

将文件转化为html格式或者pdf格式

话不多说，直接上代码。

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(基于OpenOffice服务)将文件(*.doc、*.docx、*.xls、*.ppt)转化为html格式或者pdf格式，
 * 使用前请检查OpenOffice服务是否已经开启, OpenOffice进程名称：soffice.exe | soffice.bin
 * 
 * @author yjclsx
 */
public class Doc2HtmlUtil {

    private static Doc2HtmlUtil doc2HtmlUtil;

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

    /**
     * 转换文件成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构建输入文件
         */
        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("文件转换出错，请检查OpenOffice服务是否启动。");
        }
        // convert
        DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
        converter.convert(docInputFile, htmlOutputFile);
        connection.disconnect();
        // 转换完之后删除word文件
        docInputFile.delete();
        return htmFileName;
    }

    /**
     * 转换文件成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构建输入文件
         */
        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("文件转换出错，请检查OpenOffice服务是否启动。");
        }
        // convert
        DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
        converter.convert(docInputFile, htmlOutputFile);
        connection.disconnect();
        // 转换完之后删除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/周报模版.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");

    }

}

　　转换成html和转换成pdf的过程几乎一样，只是在创建输出的File时前者命名为XXX.html，后者命名为XXX.pdf，在执行converter.convert(docInputFile, htmlOutputFile);时，jodconverter会自己根据文件类型名转换成对应的文件。 
注意，main方法里别file2Html和file2pdf都调用，会报错的，要么转html，要么转pdf，只能选一个。还有就是在执行之前，需要启动openOffice的服务：在openOffice目录下的命令窗口中执行soffice -headless -accept=”socket,host=127.0.0.1,port=8100;urp;” -nofirststartwizard即可启动。 
以上需要引入jodconverter的jar包。