java通过jacob实现office在线预览功能

简介：

这篇文章中的代码都是参考于网上的，只做一个记录。主要做的就是实现一个office在线预览功能。

第一步：装office

第二步：下载jacob

打开网址下载，目前最新的是1.19版本。

第三步：配置jdk

解压下载完的jacob压缩包，根据jdk的版本选择dll中的一个，放入/jdk/jre/bin中。

第四步：在项目中引入jar包

在maven官网上找不到com.jacob的jar包，只能手动引入，这个jar包在jacob的压缩包中有。

<dependency>
   <groupId>com.jacob</groupId>
   <artifactId>jacob</artifactId>
   <version>1.19</version>
   <scope>system</scope>
   <systemPath>${project.basedir}/lib/jacob.jar</systemPath>
</dependency>

第五步：将office转化为pdf文件

这里需要再次说明，这个代码不是我写的，这里只是做个记录，方便下次用到的时候直接使用。

import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletResponse;
import com.jacob.activeX.ActiveXComponent;
import com.jacob.com.ComThread;
import com.jacob.com.Dispatch;
import com.jacob.com.Variant;
import org.springframework.web.bind.annotation.RestController;
import java.io.*;

@RestController
public class PdfConvert {

  @RequestMapping("/PdfConvert.do")
  public void PdfConvert(HttpServletResponse response) {
    String path = "C:\\Users\\acer\\Desktop\\测试.doc";
    String path2 = "C:\\Users\\acer\\Desktop\\测试.pdf";
    word2PDF(path, path2);
    String path3 = "C:\\Users\\acer\\Desktop\\测试2.ppt";
    String path4 = "C:\\Users\\acer\\Desktop\\测试2.pdf";
    ppt2PDF(path3, path4);
    String path5 = "C:\\Users\\acer\\Desktop\\测试3.xls";
    String path6 = "C:\\Users\\acer\\Desktop\\测试3.pdf";
    excel2PDF(path5, path6);
  }

  public boolean word2PDF(String inputFile, String pdfFile) {
    ActiveXComponent app = new ActiveXComponent("Word.Application");
    try {
      app.setProperty("Visible", false);
      Dispatch docs = app.getProperty("Documents").toDispatch();
      Dispatch doc = Dispatch.call(docs, "Open", new Object[]{inputFile, false, true}).toDispatch();
      Dispatch.call(doc, "ExportAsFixedFormat", new Object[]{pdfFile, 17});
      Dispatch.call(doc, "Close", new Object[]{false});
      app.invoke("Quit", 0);
      return true;
    } catch (Exception var6) {
      app.invoke("Quit", 0);
      return false;
    }
  }

  public boolean excel2PDF(String inputFile, String pdfFile) {
    ComThread.InitSTA(true);
    ActiveXComponent app = new ActiveXComponent("Excel.Application");
    try {
      app.setProperty("Visible", false);
      app.setProperty("AutomationSecurity", new Variant(3));
      Dispatch excels = app.getProperty("Workbooks").toDispatch();
      Dispatch excel = Dispatch.invoke(excels, "Open", 1, new Object[]{inputFile, new Variant(false), new Variant(false)}, new int[9]).toDispatch();
      Dispatch.invoke(excel, "ExportAsFixedFormat", 1, new Object[]{new Variant(0), pdfFile, new Variant(0)}, new int[1]);
      Dispatch.call(excel, "Close", new Object[]{false});
      if (app != null) {
        app.invoke("Quit", new Variant[0]);
        app = null;
      }

      ComThread.Release();
      return true;
    } catch (Exception var6) {
      app.invoke("Quit");
      return false;
    }
  }

  public boolean ppt2PDF(String inputFile, String pdfFile) {
    ActiveXComponent app = new ActiveXComponent("PowerPoint.Application");

    try {
      Dispatch ppts = app.getProperty("Presentations").toDispatch();
      Dispatch ppt = Dispatch.call(ppts, "Open", new Object[]{inputFile, true, true, false}).toDispatch();
      Dispatch.call(ppt, "SaveAs", new Object[]{pdfFile, 32});
      Dispatch.call(ppt, "Close");
      app.invoke("Quit");
      return true;
    } catch (Exception var6) {
      app.invoke("Quit");
      return false;
    }
  }
}

第六步：在页面上展示pdf

后端：

@RequestMapping("/GetPdf.do")
  public void GetPdf(HttpServletResponse response) {
    //从数据库中查出文件位置和文件名字
    String pdfpath = "C:\\Users\\acer\\Desktop\\测试.pdf";
    String pdfname = "测试";
    try {
      File file = new File(pdfpath);
      if (!file.exists()) {
        response.getWriter().write("该文档生成pdf失败,请下载文档查看");
        return;
      }
      InputStream fis = new FileInputStream(pdfpath);
      byte[] buffer = new byte[1024];
      response.reset();
      response.addHeader("Content-Disposition", "inline;filename=" + java.net.URLEncoder.encode(pdfname, "UTF-8"));
      response.addHeader("Content-Length", "" + file.length());
      response.setContentType("application/pdf");
      OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
      int nbytes = 0;
      while ((nbytes = fis.read(buffer)) != -1) {
        toClient.write(buffer, 0, nbytes);
        toClient.flush();
      }
      toClient.flush();
      toClient.close();
      fis.close();
    } catch (Exception ex) {
      ex.printStackTrace();
    }
  }

前端：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8"/>
  <title>pdf在线预览</title>
</head>
<body>
<div style=" width: 100%; height: 100%;">
  <embed src="/GetPdf.do"
      type="application/pdf" style="overflow: auto; width: 100%; height: 800px;" />
</div>
</body>
</html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。