Java 小程序 java.security.AccessControlException [英] Java applet java.security.AccessControlException
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问题描述
我正在开发一个打印文件的 Java 小程序.小程序是自签名的".
I'm working on an Java applet that prints a file. The applet is "self-signed".
打印功能为:
//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;
}
尝试打开文件时出现此异常:
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/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>
正确使用:
DocFlavor.INPUT_STREAM.AUTOSENSE
这个想法似乎是打印尽可能多的文件类型 - pdf、docx、jpg 等.
The idea seems to be to print as many file type as possible - pdf, docx, jpg, etc.
如何修复异常?
推荐答案
找到答案(在 stackoverflow 上哈哈 :D)!
Found the answer (on stackoverflow lol :D)!
看起来问题是:
所以小程序被阻止了.我们必须使用
so the applet is blocked. we have to use
AccessController.doPrivileged()
这是我的实现:
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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