如何在java applet里面调用网页里面的javascript对象?(300分)

cAkk · 2000-09-26

其实我是想在applet里面使用cookie,如果有别的解决办法也可.
要求:用VJ++实现,因为我只有这个IDE.

eguy · 2000-09-27

Applet调用Javascript,下面代码： 
 
[Java Applet] 
import java.applet.*;
 
import java.net.*;
 
 
public class theApplet extends Applet 
{ 
public void init() 
{ 
String sAbc = &quot;I am going to HTML Tag thru the JavaScript's Function&quot;;
 
try 
{ 
getAppletContext().showDocument (new URL(&quot;javascript:doAlert(/&quot;&quot;
+sAbc+
&quot;/&quot

&quot

);
 
getAppletContext().showDocument(new
URL(&quot;javascript:jumpFunction(/&quot;#JUMP/&quot

&quot

);
 
} 
catch (MalformedURLException me) { } 
 
} 
} 
 
[JavaScript and HTML] 
&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;
 
&lt;BODY&gt;
 
&lt;SCRIPT language=&quot;JavaScript1.2&quot;&gt;
 
functiondo
Alert(sXyz) 
{ 
alert(sXyz);
 
} 
function jumpTo(jumpingTo) 
{ 
self.location=jumpingTo;
 
} 
&lt;/SCRIPT&gt;
 
&lt;APPLET CODE=&quot;theApplet.class&quot;
NAME=&quot;theApplet&quot;
MAYSCRIPT
HEIGHT=400 WIDTH=100&gt;
 
&lt;/APPLET&gt;
 
&lt;P&gt;&lt;BR&gt;&lt;BR&gt;
 
&lt;BR&gt;Just writing some text as the&lt;BR&gt;Browser has to jumpdo
wn to &lt;BR&gt;the
line where we mentioned&lt;BR&gt;to jump to&lt;BR&gt;&lt;BR&gt;&lt;BR&gt;&lt;BR&gt;
 
&lt;/P&gt;
 
&lt;P&gt;
 
&lt;BR&gt;
 
&lt;A NAME=&quot;JUMP&quot;&gt;The result of the output of applet the browser should jump
to this place&lt;/A&gt;
 
&lt;/BODY&gt;
 
&lt;/HTML&gt;
 
如果客户端是IE的话，需要import netscape.javascript.*;
 
并且在applet将window换成JSObject.

eguy · 2000-09-27

其实Javascript调用Applet更容易一些，
如果你需要的话，也可以贴一些代码上来。

eguy · 2000-09-27

如果使用JSObject的话，可以参考以下方法
JSObject win = JSObject.getWindow(this);
JSObjectdo
c = (JSObject) win.getMember("document");
JSObject loc = (JSObject)do
c.getMember("location");

cAkk · 2000-09-27

看上去不错,能给段代码实现cookie的操作吗?
抱歉我对java很外行的.

eguy · 2000-09-27

前面说得不清楚，下面重新来一遍。 
One:如果你的JDK是1.2.2以上(应该没问题吧）以上，请找到c:/jdk/jre/lib/jaws.jar 
将其添加入classpath.因为其中含有packge：netscape.javascript.Jsobject 　 
VJ我没用过，我想它加入packge的功能还是应该有。: 
Two:写你的HTML文件，用Javascript写两个方法分别写cookie和读cookie，下面附带一个例子 
&lt;html&gt; 
 
&lt;head&gt; 
&lt;title&gt;Testing&lt;/title&gt; 
&lt;script&gt; 
 
function setCookie(txt){ 
document.cookie = txt; 
alert (&quot;Setting cookie : &quot;
+ txt); 
} 
 
function getCookie(){ 
var cookieAfter =do
cument.cookie; 
alert (&quot;Getting the cookie : &quot;
+ cookieAfter); 
return cookieAfter; 
} 
 
&lt;/script&gt; 
&lt;/head&gt; 
 
&lt;!-- The MAYSCRIPT attribute is required in order for the Java methods to be available
to the JavaScript functions. --&gt; 
&lt;applet code=&quot;cakk.class&quot;
Width=400 Height=50 MAYSCRIPT&gt; 
&lt;/applet&gt; 
 
&lt;/html&gt; 
 
Three:编写你的Applet,示例如下： 
//Title: JavatoJs 
//Version: 1.0 
//Copyright: Copyright (c) eguy 
//Author: eguy 
//Company: 
//Description: 
import java.awt.*; 
import java.awt.event.*; 
import java.applet.*; 
import netscape.javascript.JSObject;
 
 
public class cakk extends Applet { 
JSObject win; 
boolean isStandalone = false; 
TextField setck = new TextField(); 
TextField getck = new TextField(); 
Button button1 = new Button(); 
Button button2 = new Button(); 
GridLayout gridLayout1 = new GridLayout(); 
 
//Get a parameter value 
public String getParameter(String key, String def) { 
return isStandalone ? System.getProperty(key, def) : 
(getParameter(key) != null ? getParameter(key) : def); 
} 
 
//Construct the applet 
public cakk() { 
} 
 
//Initialize the applet 
public void init() { 
try { 
jbInit(); 
} 
catch(Exception e) { 
e.printStackTrace(); 
} 
} 
 
//Component initialization 
private void jbInit() throws Exception { 
try{ 
win = JSObject.getWindow(this); 
}catch (Exception e){ 
//do
n't throw exception information away, print it. 
e.printStackTrace(); 
} 
 
&nbsp;&nbsp;&nbsp;
setck.setText(&quot;Set cookie&quot

; 
this.setLayout(gridLayout1); 
getck.setText(&quot;Get cookie&quot

; 
button1.setLabel(&quot;Set&quot

; 
button1.addActionListener(new java.awt.event.ActionListener() { 
 
public void actionPerformed(ActionEvent e) { 
button1_actionPerformed(e); 
} 
}); 
button2.setLabel(&quot;Get&quot

; 
button2.addActionListener(new java.awt.event.ActionListener() { 
 
public void actionPerformed(ActionEvent e) { 
button2_actionPerformed(e); 
} 
}); 
this.add(setck, null); 
this.add(button1, null); 
this.add(getck, null); 
this.add(button2, null); 
} 
 
//Start the applet 
public void start() { 
} 
 
//Stop the applet 
public void stop() { 
} 
 
//Destroy the applet 
public void destroy() { 
} 
 
//Get Applet information 
public String getAppletInfo() { 
return &quot;Applet Information&quot;; 
} 
 
//Get parameter info 
public String[][] getParameterInfo() { 
return null; 
} 
 
void button1_actionPerformed(ActionEvent e) { 
String msg[]; 
msg = new String[1]; 
 
// Create a local copy of the cookie text 
msg[0] = setck.getText(); 
 
// Call the JavaScript function to set the cookie 
win.call(&quot;setCookie&quot;, msg); 
 
} 
 
void button2_actionPerformed(ActionEvent e) { 
 
String txt = (String)win.call(&quot;getCookie&quot;,null); 
getck.setText(txt); 
} 
} 
Four:这里Cookie的写入和读出均较简单，仅是测试。复杂的根据自己要求写吧。

eguy · 2000-10-15

cAkk:请继续或结束问题

yuanjun · 2000-10-23

step by step，好强啊，eguy

wjiachun · 2000-11-29

接受答案了.

如何在java applet里面调用网页里面的javascript对象?(300分)

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