Java实现在线预览的示例代码(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。

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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。希望对大家的学习有所帮助，也希望大家多多支持快网idc。

原文链接：http://blog.csdn.net/yjclsx/article/details/51445546