Java實現在線預覽--openOffice實現

#Java實現在線預覽–openOffice實現
##簡介
之前有寫了poi實現在線預覽的文章，裏面也說到了使用openOffice也可以做到，這裏就詳細介紹一下。
我的實現邏輯有兩種：
一、利用jodconverter(基於OpenOffice服務)將文件(.doc、.docx、.xls、.ppt)轉化爲html格式。
二、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。
##將文件轉化爲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();
		// 轉換完之後刪除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();
		// 轉換完之後刪除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的過程幾乎一樣，只是在創建輸出的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會自己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。還有就是在執行之前，需要啓動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即可啓動。
以上需要引入jodconverter的jar包。