Java实现在线预览--openOffice实现

我就是我 2022-07-24 08:27 352阅读 0赞

\#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。