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java将其他类型文档转换为PDF,代码如下：

  private static final int wdFormatPDF = 17;
    private static final int xlFormatPDF = 0;
    private static final int ppFormatPDF = 32;
 // excel转换为PDF
  private boolean excelToPDF(String inputFile, String pdfFile) {
        ComThread.InitSTA();

        long start = System.currentTimeMillis();
        ActiveXComponent app = null;
        Dispatch excel = null;
        try {
            app = new ActiveXComponent("Excel.Application");// 创建一个EXCEL对象
            app.setProperty("Visible", new Variant(false)); // 不可见打开
            // app.setProperty("AutomationSecurity", new Variant(3)); // 禁用宏
            Dispatch excels = app.getProperty("Workbooks").toDispatch();// 获取文挡属性

            // 调用Documents对象中Open方法打开文档，并返回打开的文档对象Document
            excel = Dispatch.call(excels, "Open", inputFile, false, true).toDispatch();
            
           //设置横向打印
            Dispatch sheets = Dispatch.get((Dispatch) excel, "Sheets")
              .toDispatch();
            // 获得sheet数
            int count = Dispatch.get(sheets, "Count").getInt();
            for (int j = 1; j <=count; j++) {
             Dispatch sheet = Dispatch.invoke(sheets, "Item",
               Dispatch.Get, new Object[] { new Integer(j) },
               new int[1]).toDispatch();
             Dispatch pageSetup = Dispatch.get(sheet, "PageSetup").toDispatch();
             Dispatch.put(pageSetup, "Orientation", new Variant(2));
           //  Dispatch.call(sheet, "PrintOut");//此方法会调用打印程序进行打印，根据情况选择是否使用
            }
            //设置横向打印结束
           // 调用Document对象方法，将文档保存为pdf格式
            System.out.println("转换文档 [" + inputFile + "] >>> [" + pdfFile + "]");
            // Excel 不能调用SaveAs方法
            Dispatch.call(excel, "ExportAsFixedFormat", xlFormatPDF, pdfFile);

            long end = System.currentTimeMillis();
            System.out.println("用时：" + (end - start) + "ms.");
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("========Error:文档转换失败：" + e.getMessage());
        } finally {
            Dispatch.call(excel, "Close", false);
            System.out.println("关闭文档");
            if (app != null)
                app.invoke("Quit", new Variant[] {});
        }
        ComThread.Release();
        ComThread.quitMainSTA();
        return false;
    }
// word转换为pdf
private boolean word2PDF(String inputFile, String pdfFile) {
        ComThread.InitSTA();

        long start = System.currentTimeMillis();
        ActiveXComponent app = null;
        Dispatch doc = null;
        try {
            app = new ActiveXComponent("Word.Application");// 创建一个word对象
            app.setProperty("Visible", new Variant(false)); // 不可见打开word
            app.setProperty("AutomationSecurity", new Variant(3)); // 禁用宏
            Dispatch docs = app.getProperty("Documents").toDispatch();// 获取文挡属性

            System.out.println("打开文档 >>> " + inputFile);
            // Object[]第三个参数是表示“是否只读方式打开”
            // 调用Documents对象中Open方法打开文档，并返回打开的文档对象Document
            doc = Dispatch.call(docs, "Open", inputFile, false, true).toDispatch();
            // 调用Document对象的SaveAs方法，将文档保存为pdf格式
            System.out.println("转换文档 [" + inputFile + "] >>> [" + pdfFile + "]");
            Dispatch.call(doc, "SaveAs", pdfFile, wdFormatPDF);//word保存为pdf格式宏，值为17

            long end = System.currentTimeMillis();
            System.out.println("用时：" + (end - start) + "ms.");
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            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();
        ComThread.quitMainSTA();
        return false;
    }
// PPT转换为PDF
private boolean ppt2PDF(String inputFile, String pdfFile) {
        ComThread.InitSTA();

        long start = System.currentTimeMillis();
        ActiveXComponent app = null;
        Dispatch ppt = null;
        try {
            app = new ActiveXComponent("PowerPoint.Application");// 创建一个PPT对象
            // app.setProperty("Visible", new Variant(false)); // 不可见打开（PPT转换不运行隐藏，所以这里要注释掉）
            // app.setProperty("AutomationSecurity", new Variant(3)); // 禁用宏
            Dispatch ppts = app.getProperty("Presentations").toDispatch();// 获取文挡属性

            System.out.println("打开文档 >>> " + inputFile);
            // 调用Documents对象中Open方法打开文档，并返回打开的文档对象Document
            ppt = Dispatch.call(ppts, "Open", inputFile, 
                    true,// ReadOnly
                    true,// Untitled指定文件是否有标题
                    false// WithWindow指定文件是否可见
                    ).toDispatch();
            
            System.out.println("转换文档 [" + inputFile + "] >>> [" + pdfFile + "]");
            Dispatch.call(ppt, "SaveAs", pdfFile, ppFormatPDF);

            long end = System.currentTimeMillis();
            System.out.println("用时：" + (end - start) + "ms.");

            return true;
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("========Error:文档转换失败：" + e.getMessage());
        } finally {
            Dispatch.call(ppt, "Close");
            System.out.println("关闭文档");
            if (app != null)
                app.invoke("Quit", new Variant[] {});
        }
        ComThread.Release();
        ComThread.quitMainSTA();
        return false;
    }