先说一说如何实现在线预览doc
网上查了很多资料,基本思路就是将doc 转为 pdf,由于低版本浏览器不支持预览pdf,所以基本是再将pdf 转为 swf。
由于我这次做的需求只需要兼容chrome即可,所以我选择直接使用pdf.js在线预览pdf,本文使用 pdf.js + jodconverter + openOffice
如何将doc 转为 pdf?
java将doc文件转换为pdf文件的三种方法
poi读取doc + itext生成pdf (实现最方便,效果最差,跨平台)
jodconverter + openOffice (一般格式实现效果还行,复杂格式容易有错位,跨平台)
jacob + msOfficeWord + SaveAsPDFandXPS (完美保持原doc格式,效率最慢,只能在windows环境下进行)
环境安装:
(正式环境部署安装的是libreoffice,openopenOffice的衍生版,之前有些无法转换的doc文件,使用libreoffice后正常转换)
openOffice下载
linux上环境所需要的字体包 和 libreoffice:https://pan.baidu.com/s/1mjhpdna 密码: 82ca
安装后,使用以下命令可以启动openoffice
soffice -headless -accept="socket,host=127.0.0.1,port=8100;urp;" -nofirststartwizard
windows下查看是否启动
netstat -ano|findstr "8100"
windows示例
jodconverter 所需 maven依赖
<!-- jodconverter--> <dependency> <groupId>com.artofsolving</groupId> <artifactId>jodconverter</artifactId> <version>2.2.1</version> </dependency>
下面是在CSDN找的一段转换类的代码,我只用到了doc2pdf()
import java.io.BufferedInputStream; import java.io.File; import java.io.IOException; import java.io.InputStream; 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; /** * doc docx格式转换 */ public class DocConverter { private static final int environment = 1;// 环境 1:windows 2:linux private String fileString;// (只涉及pdf2swf路径问题) private String outputPath = "";// 输入路径 ,如果不设置就输出在默认的位置 private String fileName; private File pdfFile; private File swfFile; private File docFile; public DocConverter(String fileString) { ini(fileString); } /** * 重新设置file * * @param fileString */ public void setFile(String fileString) { ini(fileString); } /** * 初始化 * * @param fileString */ private void ini(String fileString) { this.fileString = fileString; fileName = fileString.substring(0, fileString.lastIndexOf(".")); docFile = new File(fileString); pdfFile = new File(fileName + ".pdf"); swfFile = new File(fileName + ".swf"); } /** * 转为PDF * * @param file */ private void doc2pdf() throws Exception { if (docFile.exists()) { if (!pdfFile.exists()) { OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100); try { connection.connect(); DocumentConverter converter = new OpenOfficeDocumentConverter(connection); converter.convert(docFile, pdfFile); // close the connection connection.disconnect(); System.out.println("****pdf转换成功,PDF输出:" + pdfFile.getPath()+ "****"); } catch (java.net.ConnectException e) { e.printStackTrace(); System.out.println("****swf转换器异常,openoffice服务未启动!****"); throw e; } catch (com.artofsolving.jodconverter.openoffice.connection.OpenOfficeException e) { e.printStackTrace(); System.out.println("****swf转换器异常,读取转换文件失败****"); throw e; } catch (Exception e) { e.printStackTrace(); throw e; } } else { System.out.println("****已经转换为pdf,不需要再进行转化****"); } } else { System.out.println("****swf转换器异常,需要转换的文档不存在,无法转换****"); } } /** * 转换成 swf */ @SuppressWarnings("unused") private void pdf2swf() throws Exception { Runtime r = Runtime.getRuntime(); if (!swfFile.exists()) { if (pdfFile.exists()) { if (environment == 1) {// windows环境处理 try { Process p = r.exec("D:/Program Files/SWFTools/pdf2swf.exe "+ pdfFile.getPath() + " -o "+ swfFile.getPath() + " -T 9"); System.out.print(loadStream(p.getInputStream())); System.err.print(loadStream(p.getErrorStream())); System.out.print(loadStream(p.getInputStream())); System.err.println("****swf转换成功,文件输出:" + swfFile.getPath() + "****"); if (pdfFile.exists()) { pdfFile.delete(); } } catch (IOException e) { e.printStackTrace(); throw e; } } else if (environment == 2) {// linux环境处理 try { Process p = r.exec("pdf2swf " + pdfFile.getPath() + " -o " + swfFile.getPath() + " -T 9"); System.out.print(loadStream(p.getInputStream())); System.err.print(loadStream(p.getErrorStream())); System.err.println("****swf转换成功,文件输出:" + swfFile.getPath() + "****"); if (pdfFile.exists()) { pdfFile.delete(); } } catch (Exception e) { e.printStackTrace(); throw e; } } } else { System.out.println("****pdf不存在,无法转换****"); } } else { System.out.println("****swf已经存在不需要转换****"); } } static String loadStream(InputStream in) throws IOException { int ptr = 0; in = new BufferedInputStream(in); StringBuffer buffer = new StringBuffer(); while ((ptr = in.read()) != -1) { buffer.append((char) ptr); } return buffer.toString(); } /** * 转换主方法 */ @SuppressWarnings("unused") public boolean conver() { if (swfFile.exists()) { System.out.println("****swf转换器开始工作,该文件已经转换为swf****"); return true; } if (environment == 1) { System.out.println("****swf转换器开始工作,当前设置运行环境windows****"); } else { System.out.println("****swf转换器开始工作,当前设置运行环境linux****"); } try { doc2pdf(); pdf2swf(); } catch (Exception e) { e.printStackTrace(); return false; } if (swfFile.exists()) { return true; } else { return false; } } /** * 返回文件路径 * * @param s */ public String getswfPath() { if (swfFile.exists()) { String tempString = swfFile.getPath(); tempString = tempString.replaceAll("\\\\", "/"); return tempString; } else { return ""; } } /** * 设置输出路径 */ public void setOutputPath(String outputPath) { this.outputPath = outputPath; if (!outputPath.equals("")) { String realName = fileName.substring(fileName.lastIndexOf("/"), fileName.lastIndexOf(".")); if (outputPath.charAt(outputPath.length()) == '/') { swfFile = new File(outputPath + realName + ".swf"); } else { swfFile = new File(outputPath + realName + ".swf"); } } } }
接下来是pdf.js的使用
百度网盘: https://pan.baidu.com/s/1dHk0IQH 密码: n47x
下载后我们需要用到generic文件夹下的两个目录,新建pdf文件夹
文件目录
我使用的是springboot工程,添加静态资源访问
@Configuration@ComponentScanpublic class TXAppConfigurer extends WebMvcConfigurerAdapter implements ApplicationContextAware { private ApplicationContext applicationContext; public TXAppConfigurer() { super(); } @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/pdf/**") .addResourceLocations(ResourceUtils.CLASSPATH_URL_PREFIX + "/pdf/"); super.addResourceHandlers(registry); } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.applicationContext = applicationContext; } }
请求 http://localhost:8080/pdf/web/viewer.html?file=/displayPDF/4 会跳转到controller
import java.io.File;import java.io.FileInputStream;import java.io.OutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.io.IOUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import com.txgl.entity.FaultFileEntity;import com.txgl.service.FaultService;import com.txgl.util.DocConverter;/** * 文件预览 * * @author @Taven * */@Controllerpublic class FilePreview { @Autowired private FaultService faultService; @RequestMapping("/displayPDF/{id}") @ResponseBody public void displayPDF(@PathVariable Long id, HttpServletRequest request, HttpServletResponse response) { FaultFileEntity file = faultService.findFaultFile(id); // 调用转换类 DocConverter docConverter = new DocConverter(file.getFilePath()); try { docConverter.doc2pdf(); File pdf = docConverter.getPdf(); FileInputStream fileInputStream = new FileInputStream(pdf); response.setHeader("Content-Disposition", "attachment;fileName=test.pdf"); response.setContentType("multipart/form-data"); OutputStream outputStream = response.getOutputStream(); IOUtils.write(IOUtils.toByteArray(fileInputStream), outputStream); } catch (Exception e) { e.printStackTrace(); } } }
参考博客:
java实现附件预览(openoffice+swftools+flexpaper)
java集成pdf.js实现pdf文件在线预览
作者:殷天文
链接:https://www.jianshu.com/p/b5db6d43f8d1