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

https://sourceforge.net/projects/jacob-project/files/jacob-project/

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>