Java Applet小程序怎样向html传参数？

rxr 2001-02-06 11:52:00

我做了一个网页，其中插了一个Applet小程序，是生成随即数的，因为在生成时会伴随一些图形运动，所以无法用asp做，

不知怎样把java生成的随即数组传到html页面中？现请教！

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虎叔 2001-02-06

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好像不可以！

skyyoung 2001-02-06

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Call Javascript from a Java applet
Netscape only
A Javascript function is called from Java by using the showDocument method. A URL is needed with "javascript:" as the protocol.
[Java applet] import java.applet.*;
import java.net.*;

public class inJava extends Applet{
public void init(){
String msg = "We will jump to an HTML tag";
try {
getAppletContext().showDocument
(new URL("javascript:doAlert(\"" + msg +"\")"));
getAppletContext().showDocument
(new URL("javascript:jumpTo(\"#JUMP\")"));
}
catch (MalformedURLException me) { }
}
}

[Javascript and HTML] <HTML><HEAD></HEAD><BODY>
<SCRIPT>
function doAlert(s) {
alert(s);
}
function jumpTo(tag) {
self.location=tag;
}
</SCRIPT>
<APPLET CODE="inJava.class"
NAME="myApplet" MAYSCRIPT
HEIGHT=400 WIDTH=10>
</APPLET>
<P>
<A NAME="JUMP">jump here from Java via Javascript</A>
</BODY>
</HTML>

Netscape AND Microsoft Internet Explorer v4
With IE4, Microsoft included the Netscape package netscape.javascript.* to allow a JAVA applet access to Javascript objects. To compile such Applet, you must adjust the CLASSPATH to include the Netscape java40.jar. To use the Netscape JAR, the CLASSPATH will look like this: set CLASSPATH=
.;c:\windev\jdk1.1.3\lib\classes.zip;
c:\Program Files\Netscape\Communicator\Program\Java\Classes\java40.jar;

Note that your CLASSPATH may be different depending on your JDK installation/version
To compile with IE, first locate the java\packages directory in the Windows or WinNt directory. You will find a bunch a zip files with strange names. On my installation (IE5), the file Qk1r3vrp.zip is the one containing the 2 classes you need, JSObject.class and JSException.Class. Include this zip in the classpath before compiling (or you can extract the 2 files (with directory) and create a new smaller ZIP (again with the directory) and use the new zip in the classpath). Note that if you compile with the Microsoft compiler, you don't need to do this.

In the following example, you type in the TextField a Javascript function and press the button to execute the function. For example, try alert('Hello from JAVA'). Or you can execute function defined on the same page as the Applet. The Applet must contains the MAYSCRIPT parameter to be able to use JSObject. import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import netscape.javascript.*;

public class jsJAVA extends Applet implements
ActionListener {
Button b;
TextField t;

public void init() {
t = new TextField(20);
add(t);
b = new Button("execute Javascript");
add(b);
b.addActionListener(this);
}

public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == b) {
JSObject win = (JSObject) JSObject.getWindow(this);
win.eval(t.getText());
}
}
}

Another way is to use the Reflection API. That way you don't need to modify your CLASSPATH for compilation or even import the netscape.jsobject package. // posted by C Werner on the realhowto list
import java.lang.reflect.*;
...
// Somewhere in the applet class ...
...
String jscmd = "window.close()"; /* JavaScript command */
String jsresult = null;
boolean success = false;
try {
Method getw = null, eval = null;
Object jswin = null;
Class c =
class.forName("netscape.javascript.JSObject"); /* does it in IE too */
Method ms[] = c.getMethods();
for (int i = 0; i < ms.length; i++) {
if (ms[i].getName().compareTo("getWindow") == 0)
getw = ms[i];
else if (ms[i].getName().compareTo("eval") == 0)
eval = ms[i];
}
}
Object a[] = new Object[1];
a[0] = this; /* this is the applet */
jswin = getw.invoke(c, a); /* this yields the JSObject */
a[0] = jscmd;
Object result = eval.invoke(jswin, a);
if (result instanceof String)
jsresult = (String) result;
else
jsresult = result.toString();
success = true;
}

catch (InvocationTargetException ite) {
jsresult = "" + ite.getTargetException();
}
catch (Exception e) {
jsresult = "" + e;
}

if (success)
System.out.println("eval succeeded, result is " + jsresult);
else
System.out.println("eval failed with error " + jsresult);

gaoql 2001-02-06