package com.gblfy.office.utils; import org.apache.commons.io.IOUtils; import javax.servlet.http.HttpServletResponse;
import java.io.*; /*** @@author gblfy* @Date : 2022 -11-05 11 :20* @describe: 文档在线预览* < p> * 服务器环境：Linux环境* 现支持文档类型: Excel word ppt pdf*/
public class ExecuteLinuxShellUtil { private static ExecuteLinuxShellUtil linuxPageDIsplsyFileUtil; public static synchronized ExecuteLinuxShellUtil getSwitchUtil ( ) { if ( linuxPageDIsplsyFileUtil == null) { linuxPageDIsplsyFileUtil = new ExecuteLinuxShellUtil( ) ; } return linuxPageDIsplsyFileUtil; } /*** 文档在线预览** @param response* @param fileStoragePath 文件存储路径 ( 前段获取文件存储路径返给后台) * @param beforeConversion 文件名( 必须带文件后缀名,这里指的就是文件全名称) * @throws Exception*/public void conversionFile( HttpServletResponse response, String fileStoragePath, String beforeConversion) throws Exception { //文件存储路径//fileStoragePath = "/app/" ; //转换前的文件名//beforeConversion = "20191009133209lis_chgrpt.docx" ; String fileNamePath = fileStoragePath + beforeConversion; File file = new File( fileNamePath) ; if ( ! file.exists( )) { System.err.println( "库存中没有指定文件。。。。" ) ; return ; } //获取到文件名String interceptFileName = beforeConversion.substring( 0 , beforeConversion.lastIndexOf( "." )) ; //截取文件后缀名String fileNameSuffix = beforeConversion.substring( beforeConversion.lastIndexOf( "." ) + 1 ) ; String command = null; if ( "pdf" .equals( fileNameSuffix)) { /*** 在线预览方法*/PdfPreviewUtil.openPdf( response, fileStoragePath + interceptFileName + ".pdf" ) ; } else if ( "doc" .equals( fileNameSuffix) || "docx" .equals( fileNameSuffix) || "xls" .equals( fileNameSuffix) || "xlsx" .equals( fileNameSuffix) || "ppt" .equals( fileNameSuffix) || "pptx" .equals( fileNameSuffix)) { //文件格式转换命令 unoconv插件实现command = "/opt/libreoffice6.3/program/soffice --headless --invisible --convert-to pdf " + fileNamePath; //格式转换+在线预览formatConverAndPreview( command, response, fileStoragePath, interceptFileName) ; } else { System.err.println( "暂不支持该类型文件在线预览！！！" ) ; return ; } } /*** 格式转换+在线预览 方法** @param command 文件格式转换命令 例：/usr/bin/unoconv -f pdf /app/1.pptx* @param response http响应网页,实现在线预览* @param fileStoragePath 准备文件存放路径 例：/app/* @param interceptFileName 文件名 例: 1 .pptx* @throws Exception*/public void formatConverAndPreview( String command,HttpServletResponse response,String fileStoragePath,String interceptFileName) throws Exception { /*** 执行shell命令，格式转换方法*///String temp = "/usr/bin/unoconv -f pdf " + command ; executeCommand( command) ; /*** 在线预览方法*/PdfPreviewUtil.openPdf( response, fileStoragePath + interceptFileName + ".pdf" ) ; } /*** 执行shell命令* < p> * 統一把文件格式转换成pdf文件** @param command 文件格式转换命令* 例1：/usr/bin/unoconv -f pdf /app/1.pptx* 例2：/opt/libreoffice6.3/program/soffice --headless --invisible --convert-to pdf /app/1.pptx*/private static void executeCommand( String command ) { StringBuffer output = new StringBuffer( ) ; Process process; InputStreamReader inputStreamReader = null; BufferedReader reader = null; try { process = Runtime.getRuntime( ) .exec( command) ; process.waitFor( ) ; inputStreamReader = new InputStreamReader( process.getInputStream( ) , "UTF-8" ) ; reader = new BufferedReader( inputStreamReader) ; String line = "" ; while (( line = reader.readLine( )) != null) { output.append( line + "\n " ) ; } //p.destroy( ) ; //这个一般不需要} catch ( Exception e) { e.printStackTrace( ) ; } finally { IOUtils.closeQuietly( reader) ; IOUtils.closeQuietly( inputStreamReader) ; } } } package com.gblfy.office.utils; import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream; /*** pdf在吸纳预览方法** @author gblfy* @date 2022 -11-05*/
public class PdfPreviewUtil { /*** 在线预览方法* 把转换后的pdf文件在网页上进行预览** @param response http响应* @param previewFile 文件的決定路径 例：/app/20191009133209_chgrpt.pdf* @throws Exception 格式转换过程中的异常*/public static void openPdf( HttpServletResponse response, String previewFile) throws Exception { InputStream inputStream = null; OutputStream outputStream = null; //String path = "/app/20191009133209_chgrpt.pdf" ; inputStream = new FileInputStream( previewFile) ; //响应文件的类型response.setContentType( "application/pdf" ) ; response.setCharacterEncoding( "UTF-8" ) ; outputStream = response.getOutputStream( ) ; int a = 0 ; byte[ ] b = new byte[ 1024 ] ; while (( a = inputStream.read( b)) != -1) { outputStream.write( b, 0 , a) ; } if ( inputStream != null) { inputStream.close( ) ; } if ( outputStream != null) { outputStream.close( ) ; outputStream.flush( ) ; } } /*** 删除文件** @param filePath 文件* @return*/public static boolean deleteFile( String filePath) { boolean flag = false ; File file = new File( filePath) ; // 路径为文件且不为空则进行删除if ( file.isFile( ) && file.exists( )) { file.delete( ) ; flag = true ; } return flag; } } 
