Applet的方法从Javascript调用 [英] Applet method calling from Javascript
问题描述
我有一个小程序上传特定文件夹中的一些文件，并删除他们，但事情是错误的，当我把一个小程序功能，从我的javascript code，当我打电话从 init的功能（ ）它工作正常。
我的小程序code：
公共类上传扩展的Applet {
串SERVERPATH;
串clientPath;
私人JSObject取胜;
@覆盖
公共无效的init（）{
SERVERPATH =的getParameter（SERVERPATH）;
clientPath =的getParameter（clientPath）;
尝试{
赢= JSObject.getWindow（本）;
}赶上（JSException E）{
log.warning（无法访问JSObject对象）;
}
上传（专题，clientPath）;
}
公共无效上传（字符串话题，字符串clientPath）{
log.log（Level.SEVERE，上传functiond）;
DefaultHttpClient客户端=新DefaultHttpClient（）;
MultipartEntity形式=新MultipartEntity（）;
log.log（Level.SEVERE，上传functiond2）;
尝试{
文件目录=新的文件（clientPath）;
log.log（Level.SEVERE，上传functiond2.2）;
文件[] =文件directory.listFiles（）;
log.log（Level.SEVERE，上传functiond2.5）;
INT I = 0;
对于（文件文件：文件）{
log.log（Level.SEVERE，上传functiond2.6）;
我++;
form.addPart（文件+将String.valueOf（i）中，新FileBody（文件））;
的System.out.println（添加文件+将String.valueOf（我）++文件）;
log.log（Level.SEVERE，添加文件+将String.valueOf（我）++文件）;
}
log.log（Level.SEVERE，上传functiond3）;
form.addPart（主题，新StringBody（专题，Charset.forName（UTF-8）））;
form.addPart（行动，新StringBody（动作，Charset.forName（UTF-8）））;
form.addPart（路径，新StringBody（SERVERPATH，Charset.forName（UTF-8）））;
HttpPost后=新HttpPost（SERVERPATH）;
....
这是我的javascript code：
document.applet.upload（标题，C：\\扫描）;
当我从JavaScript叫只记录打印：
log.log（Level.SEVERE，上传functiond2.2）;
请注意，当我从调用初始化小程序的方法，它工作正常。
我总结我的code到 PriviligedAction ，但前进只有一步，并挂在
log.log（Level.SEVERE，上传functiond2.5）;
Java和JS的相互作用复杂的安全性。该JRE不能相信JS，所以决定包括您code是不可信的整个操作链。有一种方法来解决它。
在code需要被包裹在一个的 的PrivilegedAction ，并呼吁使用的 AccessController的 的方法是 doPrivileged的（..）。看 AccessController的文档的顶部。 （上述方法）来查看示例用法。
I have an applet to upload some files from specific folder and delete them,but something is wrong when I call an applet function from my javascript code, when I call that function from init() it works fine.
My applet code :
public class Uploader extends Applet {
String serverPath;
String clientPath;
private JSObject win;
@Override
public void init() {
serverPath = getParameter("serverPath");
clientPath = getParameter("clientPath");
try {
win = JSObject.getWindow(this);
} catch (JSException e) {
log.warning("Can't access JSObject object");
}
upload(topic,clientPath);
}
public void upload(String topic,String clientPath) {
log.log(Level.SEVERE, "upload functiond");
DefaultHttpClient client = new DefaultHttpClient();
MultipartEntity form = new MultipartEntity();
log.log(Level.SEVERE, "upload functiond2");
try {
File directory = new File(clientPath);
log.log(Level.SEVERE, "upload functiond2.2");
File[] files = directory.listFiles();
log.log(Level.SEVERE, "upload functiond2.5");
int i = 0;
for (File file : files) {
log.log(Level.SEVERE, "upload functiond2.6");
i++;
form.addPart("file" + String.valueOf(i), new FileBody(file));
System.out.println("adding file " + String.valueOf(i) + " " + file);
log.log(Level.SEVERE, "adding file " + String.valueOf(i) + " " + file);
}
log.log(Level.SEVERE, "upload functiond3");
form.addPart("topic", new StringBody(topic, Charset.forName("UTF-8")));
form.addPart("action", new StringBody(action, Charset.forName("UTF-8")));
form.addPart("path", new StringBody(serverPath, Charset.forName("UTF-8")));
HttpPost post = new HttpPost(serverPath);
....
and this is my javascript code:
document.applet.upload(title,"c:\scan");
When I called from javascript only log printed:
log.log(Level.SEVERE, "upload functiond2.2");
Note that when I call from init method of applet it works fine.
I wrap my code into a PriviligedAction, but goes only one step forward and hang on
log.log(Level.SEVERE, "upload functiond2.5");
The interaction of Java and JS complicates security. The JRE cannot trust the JS, so it decides the entire 'chain of operations' that include your code is untrusted. There is a way to fix it.
The code needs to be wrapped in a PrivilegedAction and called using one of the AccessController methods that doPrivileged(..). Look at the top of the AccessController docs. (above the methods) to see example usage.
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