项目中之前用的office转pdf的插件是aspose

因为aspose无需world。所有转换操作都是在java虚拟机里边进行的。所以如果有图片特别多的文档转换的时候就会遇到oom。

而jacob是通过本地安装的office插件将文档再本地完成转换的。就不会出现oom的情况。而弊端就是项目就只能部署在windows server服务器上。

1、先安装SaveAsPDFandXPS

2、下载 jacob 解压后存放路径：

（上传的资源还在审核，等审核通过再补上jacob的链接）

jacob.jar 放在 C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext目录下
jacob.dll 放在 C:\Program Files\Java\jdk1.8.0_171\jre\bin 目录下

注意：所选版本要跟jdk一致，例如jdk使用的是32位的，jacob.dll也要选择32位的。要不然会报错
“Could not initialize class com.jacob.com.Dispatch”

网上这个报错信息的解决方法是：

这个方法对我没用，不过也放在这里供大家参考。

3、 world转pdf

private static final int WORLD_TO_PDF_OPERAND = 17; // PDF 格式

public void wordToPDF(String sfileName, String toFileName) {

        System.out.println("启动 Word...");
        long start = System.currentTimeMillis();
        ActiveXComponent app = null;
        Dispatch doc = null;
        try {
            app = new ActiveXComponent("Word.Application");
            app.setProperty("Visible", new Variant(false));
            Dispatch docs = app.getProperty("Documents").toDispatch();
            doc = Dispatch.call(docs, "Open", sfileName).toDispatch();
            System.out.println("打开文档..." + sfileName);
            System.out.println("转换文档到 PDF..." + toFileName);
            File tofile = new File(toFileName);
            if (tofile.exists()) {
                tofile.delete();
            }
            Dispatch.call(doc, "SaveAs", toFileName, // FileName
                    WORLD_TO_PDF_OPERAND);
            long end = System.currentTimeMillis();
            System.out.println("转换完成..用时：" + (end - start) + "ms.");

        } catch (Exception e) {
            System.out.println("========Error:文档转换失败：" + e.getMessage());
        } finally {
            Dispatch.call(doc, "Close", false);
            System.out.println("关闭文档");
            if (app != null){
                app.invoke("Quit", new Variant[] {});
            }
        }
        // 如果没有这句话,winword.exe进程将不会关闭
        ComThread.Release();
    }

4、excel转pdf

private static final Integer EXCEL_TO_PDF_OPERAND = 0;

public void excelToPDF(String inFilePath, String outFilePath) {

        System.out.println("启动 Excel...");
        long start = System.currentTimeMillis();
        //pdf存在情况会出现转换错误
        File file = new File(outFilePath);
        file.delete();

        ActiveXComponent ax = null;
        Dispatch excel = null;
        try {
            ComThread.InitSTA();
            ax = new ActiveXComponent("Excel.Application");
            ax.setProperty("Visible", new Variant(false));
            ax.setProperty("AutomationSecurity", new Variant(3)); // 禁用宏
            Dispatch excels = ax.getProperty("Workbooks").toDispatch();

            Object[] obj = new Object[]{
                    inFilePath,
                    new Variant(false),
                    new Variant(false)
            };
            excel = Dispatch.invoke(excels, "Open", Dispatch.Method, obj, new int[9]).toDispatch();

            // 转换格式
            Object[] obj2 = new Object[]{
                    new Variant(EXCEL_TO_PDF_OPERAND), // PDF格式=0
                    outFilePath,
                    new Variant(0)  //0=标准 (生成的PDF图片不会变模糊) ; 1=最小文件
            };
            Dispatch.invoke(excel, "ExportAsFixedFormat", Dispatch.Method, obj2, new int[1]);

            long end = System.currentTimeMillis();
            System.out.println("转换完成..用时：" + (end - start) + "ms.");
        } catch (Exception es) {
            es.printStackTrace();
            throw es;
        } finally {
            if (excel != null) {
                Dispatch.call(excel, "Close", new Variant(false));
            }
            if (ax != null) {
                ax.invoke("Quit", new Variant[]{});
                ax = null;
            }
            ComThread.Release();
        }
    }

5、ppt转pdf

private static final Integer PPT_TO_PDF_OPERAND = 32;

public void ppt2pdf(String inFilePath, String outFilePath){
        System.out.println("启动 Excel...");
        long start = System.currentTimeMillis();
        ActiveXComponent app = null;
        Dispatch ppt = null;
        try {
            ComThread.InitSTA();
            app = new ActiveXComponent("KWPP.Application");
            Dispatch ppts = app.getProperty("Presentations").toDispatch();
            /*
             * call param 4: ReadOnly param 5: Untitled指定文件是否有标题 param 6: WithWindow指定文件是否可见
             */
            ppt = Dispatch.call(ppts, "Open", inFilePath, true, true, false).toDispatch();

            Dispatch.call(ppt, "SaveAs",outFilePath,PPT_TO_PDF_OPERAND); // ppSaveAsPDF为特定值32
            // Dispatch.callN(ppt, "SaveAs",  new Variant(pdfFilePath));
            long end = System.currentTimeMillis();
            System.out.println("转换完成..用时：" + (end - start) + "ms.");
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        } finally {
            if (ppt != null) {
                Dispatch.call(ppt, "Close");
            }
            if (app != null) {
                app.invoke("Quit");
            }
            ComThread.Release();
        }

    }

写main方法测试一下：

    public static void main(String[] args) {

        Excel2PdfModel d = new Excel2PdfModel();
        d.wordToPDF("G:\\LYX\\f\\11111111111.doc", "G:\\LYX\\f\\world2pdf.pdf");

    }

执行结果：