Java小程序不能加载从网页图片 [英] Java Applet can't load images from web

问题描述

我已经写了我的第一个Java程序。

I have wrote my first java applet.

基本上，它从我的Django的web服务器加载一些图像，然后用户可以对其进行修改。

It basically loads some images from my Django webserver and then the user can modify them.

我开发它在Eclipse中，我没有任何问题的。当我与一个测试页试了一下，在Java控制台出来这个错误：

I developed it in Eclipse, and I had no problems at all. When I tried it with a test page, on the java console come out this error:

java.security.AccessControlException: access denied (java.net.SocketPermission www.hyros.net resolve)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374)
    at java.security.AccessController.checkPermission(AccessController.java:546)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
    at java.lang.SecurityManager.checkConnect(SecurityManager.java:1031)
    at sun.plugin2.applet.Applet2SecurityManager.checkConnect(Applet2SecurityManager.java:500)
    at sun.plugin2.applet.Plugin2Manager$AppletContextImpl.getImage(Plugin2Manager.java:2718)
    at java.applet.Applet.getImage(Applet.java:242)
    at MapGenerator.getResourceImage(MapGenerator.java:50)
    at MapGenerator.init(MapGenerator.java:35)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1637)
    at java.lang.Thread.run(Thread.java:662)
Eccezione: java.security.AccessControlException: access denied (java.net.SocketPermission www.hyros.net resolve) 

在一块牵连code的：

The incriminated piece of code:

for(int i=0; i< numero_immagini; i++) {
    try {
        URL url = new URL(this.getParameter(IMMAGINE+i));
        images[i] = ImageIO.read(url);
        floors[i] = Integer.parseInt(this.getParameter(PIANO_IMMAGINE+i));
    } catch (IOException ioe) {ioe.printStackTrace();}
}

有关测试我试图将图像从我的本地网络服务器，但错误出来与每一个可能的环节，内部还是外部。

For the test i tried an image from my local webserver, but the error comes out with every possible link, internal or external.

感谢您提前。

推荐答案

除非小程序签名，将无法在其他不同的位置来访问图像，然后发端服务器。在这里，你可以使用：

Unless the applet is signed, it will not be able to access images at a different location other then that of the originating server. Here you could use:

images[i] = getImage(getDocumentBase(), IMMAGINE + i);

这篇关于Java小程序不能加载从网页图片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！