Java實現在線預覽的示例代碼(openOffice實現)

發布時間：2020-09-03 08:16:46 來源：腳本之家閱讀：145 作者：yjclsx 欄目：編程語言

簡介

之前有寫了poi實現在線預覽的文章，里面也說到了使用openOffice也可以做到，這里就詳細介紹一下。

我的實現邏輯有兩種：

一、利用jodconverter(基于OpenOffice服務)將文件(.doc、.docx、.xls、.ppt)轉化為html格式。

二、利用jodconverter(基于OpenOffice服務)將文件(.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，也就實現了在線預覽的功能；轉換成pdf格式這點，需要用戶安裝了Adobe Reader XI，這樣你會發現把pdf直接拖到瀏覽器頁面可以直接打開預覽，這樣也就實現了在線預覽的功能。

將文件轉化為html格式或者pdf格式

話不多說，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(基于OpenOffice服務)將文件(*.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服務是否啟動。");
    }
    // convert
    DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
    converter.convert(docInputFile, htmlOutputFile);
    connection.disconnect();
    // 轉換完之后刪除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服務是否啟動。");
    }
    // convert
    DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
    converter.convert(docInputFile, htmlOutputFile);
    connection.disconnect();
    // 轉換完之后刪除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/周報模版.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，只是在創建輸出的File時前者命名為XXX.html，后者命名為XXX.pdf，在執行converter.convert(docInputFile, htmlOutputFile);時，jodconverter會自己根據文件類型名轉換成對應的文件。

注意，main方法里別file2Html和file2pdf都調用，會報錯的，要么轉html，要么轉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目錄下的命令窗口中執行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。希望對大家的學習有所幫助，也希望大家多多支持億速云。

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