Java实现在线预览–openOffice实现[通俗易懂]

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#Java实现在线预览–openOffice实现
##简介
之前有写了poi实现在线预览的文章，里面也说到了使用openOffice也可以做到，这里就详细介绍一下。
我的实现逻辑有两种：
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。