此项目根据企业真实需求制作而成，希望能帮助大家解决在线预览的问题！
此项目已开源，欢迎大家来STAR

在这里插入图片描述

软件	版本
SpringBoot	2.2.2.RELEASE
LibreOffice	6.3.2
unoconv	0.6

文章目录

一、配置管理
- ① pom
- ② yml
- ③ controller
- ④ 文件格式转换工具类FileFormatConverToPDF
- ⑤ 在线预览previewPDFUtils
- ⑥ 启动类
二、测试验证
- ①测试链接
- ②测试效果
三、安装Unoconv
- ①yum安装Unoconv
- ②源码安装Unoconv
四、安装LibreOffice

一、配置管理

① pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.2.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.gblfy</groupId><artifactId>business-online-preview</artifactId><version>0.0.1-SNAPSHOT</version><name>business-online-preview</name><url>https://gblfy.com</url><description>在线预览</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>4.0.0</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

② yml

空

③ controller

package com.gblfy.onlinepreview.controller;import com.gblfy.onlinepreview.utils.FileFormatConverToPDF;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletResponse;/*** @author gblfy* @ClassNme FileController* @Description 文件在在线预览* @Date 2020/01/08 8:09* @version1.0*/
@RestController
public class FileOnlinePreviewController {/*** 在线预览测试方法* 企业真实需求:* 文件的路径 文件名 都需要动态获取** @param response http响应网页来实现在线预览* @throws Exception*/@RequestMapping("/viewPDF")public void reviewWord(HttpServletResponse response) throws Exception {FileFormatConverToPDF linuxPageDIsplsyFileUtil = new FileFormatConverToPDF();//文件存储路径String fileStoragePath = "/app/ftpFileDir/testFileDir/businessLearning/";//转换前的文件名String beforeConversion = "知识库建设方案2019-11-11.docx";/*** 文件格式转换+在线预览*/linuxPageDIsplsyFileUtil.conversionFile(response, fileStoragePath, beforeConversion);}
}

④ 文件格式转换工具类FileFormatConverToPDF

package com.gblfy.onlinepreview.utils;import lombok.extern.slf4j.Slf4j;
import org.apache.poi.util.IOUtils;import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.ArrayList;
import java.util.List;/*** @Author:* @Date: 2019/1/15 0015 15:04* @describe 文档在线预览  (服务器环境为Linux环境) 目前文档类型 仅开放 Excel 03/07 word 03/07 ppt 03/07*/
@Slf4j
public class FileFormatConverToPDF {//libreoffice 文件格式转换shell命令public static final String LIBREOFFICE_SHELLCMD = "/usr/bin/soffice --headless --invisible --convert-to pdf ";//unoconv 文件格式转换shell命令public static final String UNOCONV_SHELLCMD = "/usr/bin/unoconv -f pdf ";//previewfile_dir 需要预览的pdf目录public static final String PREVIEWFILE_DIR = "/root/";private static FileFormatConverToPDF linuxPageDIsplsyFileUtil;public static synchronized FileFormatConverToPDF getSwitchUtil() {if (linuxPageDIsplsyFileUtil == null) {linuxPageDIsplsyFileUtil = new FileFormatConverToPDF();}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 {String fileNamePath = fileStoragePath + beforeConversion;log.info("文件路径====" + fileNamePath);File file = new File(fileNamePath);if (!file.exists()) {log.info("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;System.out.println("获取到文件名====" + interceptFileName);System.out.println("截取文件后缀名====" + fileNameSuffix);if ("doc".equals(fileNameSuffix)|| "docx".equals(fileNameSuffix)|| "xls".equals(fileNameSuffix)|| "xlsx".equals(fileNameSuffix)|| "ppt".equals(fileNameSuffix)|| "pptx".equals(fileNameSuffix)) {System.out.println("此文件属于" + fileNameSuffix + "开始进行转换");command = LIBREOFFICE_SHELLCMD + fileNamePath;executeLinuxCmd(command);} else {command = UNOCONV_SHELLCMD + fileNamePath;executeCommand(command);}System.out.println("openPDF的参数====" + fileStoragePath + interceptFileName);previewPDFUtils.openPdf(response, PREVIEWFILE_DIR + interceptFileName + ".pdf");}/*** 使用LibreOffice进行格式转换 to pdf** @param cmd* @return* @throws IOException*/public static List<String> executeLinuxCmd(String cmd) throws IOException {log.info("执行文件转换的命令:" + cmd);Runtime run = Runtime.getRuntime();Process process = run.exec(new String[]{"/bin/sh", "-c", cmd});InputStream in = process.getInputStream();BufferedReader bs = new BufferedReader(new InputStreamReader(in));List<String> list = new ArrayList<String>();String result = null;while ((result = bs.readLine()) != null) {log.info("job result [" + result + "]");list.add(result);}in.close();process.destroy();return list;}/*** 使用Unoconv进行格式转换 to pdf** @param command* @throws Exception*/private static void executeCommand(String command) throws Exception {log.info("执行文件转换的命令:" + 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);}}
}

⑤ 在线预览previewPDFUtils

package com.gblfy.onlinepreview.utils;import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;/*** @author gblfy* @ClassNme previewPDF* @Description TODO* @Date 2020/1/8 12:47* @version1.0*/
public class previewPDFUtils {/*** 在线预览pdf文件** @param response* @param previewFile 预览pdf文件的绝对路径* @throws Exception*/public static void openPdf(HttpServletResponse response, String previewFile) throws Exception {InputStream inputStream = null;OutputStream outputStream = null;System.out.println("进入openPDF=====" + previewFile);//String path ="/home/tubiao/桌面/优化数据库.pdf";inputStream = new FileInputStream(previewFile);response.setContentType("application/pdf");outputStream = response.getOutputStream();int a = 0;byte[] b = new byte[1024];while ((a = inputStream.read(b)) != -1) {outputStream.write(b, 0, a);}if (outputStream != null) {outputStream.close();}if (inputStream != null) {inputStream.close();}}
}

⑥ 启动类

package com.gblfy.onlinepreview;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** 在线预览统一入口*/
@SpringBootApplication
public class OnlinePreviewApplication {public static void main(String[] args) {SpringApplication.run(OnlinePreviewApplication.class, args);System.out.println("启动成功！！！");}
}