Java小程序java.security.AccessControlException

问题描述

我工作的一个Java小程序打印文件。
该applet是自签名。

I'm working on an Java applet that prints a file.The applet is "self-signed".

打印功能是：

//argFilePath : path to file (http://localhost/Teste/pdf1.pdf)
//argPrintService : something like PrintServiceLookup.lookupDefaultPrintService()
private int print(String argFilePath, PrintService argPrintService){
    try
    {

        DocPrintJob printJob = argPrintService.createPrintJob();
        Doc doc;
        DocAttributeSet docAttrSet = new HashDocAttributeSet();
        PrintRequestAttributeSet printReqAttr = new HashPrintRequestAttributeSet();


            URL url = new URL(argFilePath);
            doc = new SimpleDoc(url.openStream(), DocFlavor.INPUT_STREAM.AUTOSENSE, docAttrSet);


            printJob.print(doc, printReqAttr);



    } catch (Exception e) {
        System.out.println(e);
        return 1;
    }

    return 0;
}

我在尝试打开该文件时，此异常：

I get this exception when trying to open the file:

java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:80 connect,resolve)

HTML /的javascrip

HTML/JavaScrip

<input onclick="alert(document.getElementById('xpto').print('http://localhost/Teste/pdf1.pdf'));" type="button"/>

 <applet width="180" height="120" code="printers.class" id="xpto" archive="printerAPI.jar"></applet>

是正确的使用方法：

is correct to use:

DocFlavor.INPUT_STREAM.AUTOSENSE

这个想法似乎是打印尽可能多的文件类型越好 - PDF，DOCX，JPG等

The idea seems to be to print as many file type as possible - pdf, docx, jpg, etc.

您如何解决这个例外呢？

How can you fix the exception?

推荐答案

找到了答案（计算器上笑：D）

Found the answer (on stackoverflow lol :D)!

看起来问题是：

\"javascript没有文件访问权限

所以小应用程序被阻止。我们不得不使用

so the applet is blocked. we have to use

AccessController.doPrivileged()

doPrivileged的

下面是我的实现：

private int print(String argFilePath, PrintService argPrintService){
        cPrint cP = new cPrint(argFilePath, argPrintService);
        return  (Integer) AccessController.doPrivileged(cP);
    }

class cPrint implements PrivilegedAction<Object> {
    String FilePath;
    PrintService PrintService;

    public cPrint(String argFilePath, PrintService argPrintService) {

        this.FilePath = argFilePath;
        this.PrintService = argPrintService;

    };
    public Object run() {
        // privileged code goes here

        try
        {

            DocPrintJob printJob = PrintService.createPrintJob();
            Doc doc;
            DocAttributeSet docAttrSet = new HashDocAttributeSet();
            PrintRequestAttributeSet printReqAttr = new HashPrintRequestAttributeSet();



                URL url = new URL(FilePath);
                doc = new SimpleDoc(url.openStream(), DocFlavor.INPUT_STREAM.AUTOSENSE, docAttrSet);

                printJob.print(doc, printReqAttr);



        } catch (Exception e) {
            System.out.println(e);
            return 1;
        }

        return 0;
    }
}

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