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我今天看到了有關Javascript_Java_Interaction的文章在：Javascript_Java_Interaction小程序 「代碼庫」 的問題
http://www.rgagnon.com/javadetails/java-0184.html
[ You can try the working version on that site ]
So I tried it on my PC, after some simple format change the files look like this :
========================= ================================================== =================
[C:/Dir_Fit/Javascript_Java_Interaction.html]
<FRAMESET ROWS="100%,*">
<FRAME NAME="mainFrame" SRC="Javascript_Java_Interaction_Visible_Page.html" border=0>
<FRAME NAME="scriptFrame" SRC="Javascript_Java_Interaction_Invisible_Page.html" border=0>
</FRAMESET>
--------------------------------------------------------------------------------------------
[C:/Dir_Fit/Javascript_Java_Interaction_Invisible_Page.html]
<HTML>
<HEAD>
<SCRIPT>
function replace(s,t,u)
{
i=s.indexOf(t);
r="";
if (i==-1) return s;
r+=s.substring(0,i)+u;
if (i+t.length<s.length) r+=replace(s.substring(i+t.length,s.length),t,u);
return r;
}
function getAndSendMessage()
{
theMessage=document.location.search.substring(1,255)
if (theMessage.length>0)
{
// replace all '+" by space
theMessage=replace(theMessage,'+',' ')
window.parent.mainFrame.showMessage(unescape(theMessage))
}
}
</SCRIPT>
</HEAD>
<BODY onLoad="getAndSendMessage();"></BODY>
</HTML>
-----------------------------------------------------------------------------------------
[C:/Dir_Fit/Javascript_Java_Interaction_Visible_Page.html]
<HTML>
<HEAD><SCRIPT>function showMessage(s) { alert(s) }</SCRIPT></HEAD>
<BODY>
<H1>Simple Java - Javascript interaction</H1><P>
<APPLET CODEBASE="file://C:/Dir_Fit/build/classes/" CODE="Javascript_Java_Interaction_Demo.class" WIDTH=150 HEIGHT=150></APPLET>
</BODY>
</HTML>
-----------------------------------------------------------------------------------------
Source : [C:/Dir_Fit/src/Javascript_Java_Interaction_Demo.java]
class : [C:/Dir_Fit/build/classes/Javascript_Java_Interaction_Demo.class]
import java.applet.Applet;
import java.awt.*;
public class Javascript_Java_Interaction_Demo extends Applet
{
TextField aMessage;
Button sendButton;
public void init()
{
aMessage=new TextField(20);
add(aMessage);
sendButton=new Button("Send to Javascript");
add(sendButton);
}
public boolean action(Event e,Object o)
{
if (e.target.equals(sendButton))
{
try { getAppletContext().showDocument(new java.net.URL(getCodeBase(),"Javascript_Java_Interaction_Invisible_Page.html?"+java.net.URLEncoder.encode(aMessage.getText())),"scriptFrame"); }
catch (Exception ex) { ex.printStackTrace(); }
}
return true;
}
}
========================== ================================================== ==============
它顯示頁面上的小程序[Javascript_Java_Interaction。 HTML]，但如果我在一些文本類型，然後單擊該按鈕，沒有任何反應，這個問題是在下面一行：
<APPLET CODEBASE="file://C:/Dir_Fit/build/classes/" CODE="Javascript_Java_Interaction_Demo.class" WIDTH=150 HEIGHT=150></APPLET>
所以我複製的類文件在同一目錄作爲HTML文件[C：/Dir_Fit /]並將上面的行更改爲：
<APPLET CODE="Javascript_Java_Interaction_Demo.class" WIDTH=150 HEIGHT=150></APPLET>
現在它工作，它將顯示一個警報窗口。
所以，我的問題是爲什麼當我指定代碼庫時它沒有工作？根據Java文檔，如果類文件位於不同的目錄中，則可以通過代碼庫來告訴它，該小程序將顯示出來，但如果鍵入某些文本並單擊該按鈕，則什麼都不會發生，我嘗試了不同的方式來指定代碼庫：
<APPLET CODEBASE="file:///C:/Dir_Fit/build/classes/" CODE="Javascript_Java_Interaction_Demo.class" WIDTH=150 HEIGHT=150></APPLET>
<APPLET CODEBASE="C:/Dir_Fit/build/classes/" CODE="Javascript_Java_Interaction_Demo.class" WIDTH=150 HEIGHT=150></APPLET>
<APPLET CODEBASE="build/classes/" CODE="Javascript_Java_Interaction_Demo.class" WIDTH=150 HEIGHT=150></APPLET>
<APPLET CODE="C:/Dir_Fit/build/classes/Javascript_Java_Interaction_Demo.class" WIDTH=150 HEIGHT=150></APPLET>
然而，它們都沒有工作，爲什麼？我不希望類文件與htmls處於相同的目錄中。什麼是修復？
弗蘭克