以下解答均针对服务器端Javascript(v1.4);
所有Javascript对Java对象的存取通过LiveConnect,它包括以下几个对象,
JavaArray:可在JavaScript内存取的java数组
JavaClass:一个 JavaScript 引用一个 Java Class
JavaObject:可在JavaScript内存取的java对象
JavaPackage:一个 JavaScript 引用一个 Java package下述代码调用java对象验证登陆ID
if (request.bugId != "")
{
var bug = new Packages.bugbase.Bug(parseInt(request.bugId),
request.bugPriority, request);
project.bugsLock.lock();
project.bugs[parseInt(request.bugId)] = bug;
project.bugsLock.unlock();
write("<P><b><I>====>Committed bug: </I></b>");
write(bug, "<BR>");
}
else
{
write("<P><b><I>====>Couldn't commit bug: please complete all fields.</I></b>");}
所有Javascript对Java对象的存取通过LiveConnect,它包括以下几个对象,
JavaArray:可在JavaScript内存取的java数组
JavaClass:一个 JavaScript 引用一个 Java Class
JavaObject:可在JavaScript内存取的java对象
JavaPackage:一个 JavaScript 引用一个 Java package下述代码调用java对象验证登陆ID
if (request.bugId != "")
{
var bug = new Packages.bugbase.Bug(parseInt(request.bugId),
request.bugPriority, request);
project.bugsLock.lock();
project.bugs[parseInt(request.bugId)] = bug;
project.bugsLock.unlock();
write("<P><b><I>====>Committed bug: </I></b>");
write(bug, "<BR>");
}
else
{
write("<P><b><I>====>Couldn't commit bug: please complete all fields.</I></b>");}
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- 如何编写applet以及application来进行通信
You call a Java method by giving its fully qualified name. In the following snippet, the first example calls the method in the Toolkit to retrieve the screen resolution. The second example, calls a method in our Applet.
[Java applet] import java.awt.*;
import java.applet.*;
public class inJava extends Applet{
public void sayHello() {
Graphics g = getGraphics();
g.drawString("Hello from JAVA!", 10, 10);
}
}
[Javascript and HTML (Netscape)] <HTML><HEAD></HEAD><BODY>
<SCRIPT>
alert("Screen Dimension\n" +
" width:" +
java.awt.Toolkit.getDefaultToolkit().getScreenSize().width +
" height:" +
java.awt.Toolkit.getDefaultToolkit().getScreenSize().height);
</SCRIPT>
<FORM>
<INPUT type="button" value="call JAVA"
onClick = "document.myApplet.sayHello()">
</FORM>
<APPLET CODE="inJava.class"
NAME="myApplet"
HEIGHT=100 WIDTH=100>
</APPLET>
</BODY></HTML>
NOTE: On IE4 or better, you can't call java.lang.* methods directly from Javascript or Jscript. IE javascript can only access the public methods of an applet (a class derived from java.applet.Applet) but don't have a general access to other java classes . So the solution is simple, wrap the java.lang.* call in a public method of a "dummy" Applet. import java.awt.*;
import java.applet.*;
// to be called from javascript (IE and Netscape ok)
public class inJava extends Applet{
public integer getScreenWidth() {
return Toolkit.getDefaultToolkit().getScreenSize().width);
}
public integer getScreenHeight() {
return Toolkit.getDefaultToolkit().getScreenSize().height);
}
}
[Javascript and HTML (IE and Netscape)] <HTML><HEAD></HEAD><BODY>
<SCRIPT>
function getScreenDimension() {
alert("Screen Dimension\r\n width:" +
document.myApplet.getScreenWidth() +
" height:" +
document.myApplet.getScreenHeight() );
}
</SCRIPT>
<FORM>
<INPUT type="button" value="call JAVA"
onClick = "getScreenDimension()">
</FORM>
<APPLET CODE="inJava.class"
NAME="myApplet"
HEIGHT=100 WIDTH=100>
</APPLET>
</BODY></HTML>