在Windows上从Java Applet中静默下载和打印PDF文档

时间:2012-07-23 15:16:58

标签: java windows pdf applet

我想下载PDF并打印。我想完全默默地这样做,没有向用户显示对话框。我目前正在使用自签名小程序(在部署时将使用权限进行签名)。它在Linux和OS X上可以正常工作,但不能在Windows上运行。在Windows上,它向用户显示一个用于保存文件的对话框(类型为.xps)。文件保存后,它会以静默方式发送到打印机,因此我的问题是如何在没有用户看到对话的情况下让文档静默保存。代码如下。我正在使用Apache PDFBox。我已经读过我可能需要使用PrivilegedAction,但我不明白为什么因为问题不是我无法下载文件,而是我不能默默地这样做。

/**
 * Print Applet
 * Author: kareem
 * Date: 12-02-20
 * Time: 10:57 AM
 */

import java.applet.Applet;
import java.awt.print.PrinterException;
import java.io.*;
import java.net.*;
import org.apache.pdfbox.pdmodel.PDDocument;
import netscape.javascript.*;

public class PrintApplet extends Applet {
    public void init() {
        String callbackURL = this.getParameter("callbackurl");
        String fileToPrint = this.getParameter("file");
        String successCallback = this.getParameter("successcallback");
        String failureCallback = this.getParameter("failurecallback");
        String published = this.getParameter("published");
        JSObject window = JSObject.getWindow(this);
        if (fileToPrint == null || callbackURL == null) {
            window.call(failureCallback, new String[] { "Missing required parameters." });
        } else {
            try {
                URL printURL;
                printURL = new URL(fileToPrint);
                PDDocument doc;
                doc = PDDocument.load(printURL);
                doc.silentPrint();
                try {
                    URL updateOrderUrl = new URL(callbackURL);
                    HttpURLConnection updateOrderHTTP = (HttpURLConnection) updateOrderUrl.openConnection();
                    updateOrderHTTP.setDoOutput(true);
                    updateOrderHTTP.setDoInput(true);
                    updateOrderHTTP.setRequestMethod("PUT");
                    String updateOrderData = URLEncoder.encode("printed", "UTF-8") + "=" + URLEncoder.encode(String.valueOf(System.currentTimeMillis()/1000) + "&" + URLEncoder.encode("published", "UTF-8") + "=" + URLEncoder.encode(published, "UTF-8"), "UTF-8");
                    OutputStreamWriter out = new OutputStreamWriter(updateOrderHTTP.getOutputStream());
                    out.write(updateOrderData);
                    updateOrderHTTP.getInputStream();
                    out.close();
                    window.call(successCallback, null);
                } catch(Exception e) {
                    window.call(failureCallback, new String[] { "Server callback failed." });
                }
            } catch (MalformedURLException e) {
                System.out.println("Malformed URL Exception: " + e.getMessage());
                window.call(failureCallback, new String[] { "Invalid print file URL." });
            } catch (IOException e) {
                System.out.println("IO Exception: " + e.getMessage());
                window.call(failureCallback, new String[] { "Print file could not be loaded." });
            } catch(PrinterException e) {
                System.out.println("Printer exception: " + e.getMessage());
                window.call(failureCallback, new String[] { e.getMessage() });
            }
        }
    }
}

1 个答案:

答案 0 :(得分:0)

我遇到了同样的问题,并在评论中找到了上面的答案:我们的默认打印机设置为Microsoft XPS文档编写器。

我在这里提到它,任何人都会对评论表示不满,并认为没有答案。

请1up yms的评论而不是这个答案。