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Applet

Applet. Using the APPLET Tag. Applet 屬 性 (Code, Height, Width). Applet 參數. <applet> 標籤有三個必要的屬性 width 和 height : 指定 applet 在網頁上的寬高 code : 指定 applet 類別所在位置. Attribute 由網頁中讀取 屬性. Demo.htm. <html> <body> <applet code= = " Test.Applet1.class " width=100 height=100

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Applet

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  1. Applet

  2. Using the APPLET Tag Applet 屬性 (Code, Height, Width) Applet 參數 • <applet> 標籤有三個必要的屬性 • width 和 height : 指定applet 在網頁上的寬高 • code : 指定 applet 類別所在位置

  3. Attribute由網頁中讀取屬性 Demo.htm <html> <body> <applet code= ="Test.Applet1.class"width=100 height=100 Name="Jing" Age="20"> </applet> </body> </html> Package Name Class Name package Test; import java.awt.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; public class Applet1 extends JApplet{ public void paint(Graphics g){ String Name=getParameter("Name"); g.drawString("Name="+Name,1,10); } } Package Name Class Name Package Name ClassName.java

  4. Parameter由網頁中讀取參數 <html> <body> <applet code="Test.Applet1.class" width=100 height=100 Name="Jing" Age="20"> <PARAM name=kkName value=20> </applet> </body> </html> Demo.htm import java.awt.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; public class Applet1 extends JApplet{ public void paint(Graphics g){ String Name=getParameter("kkName"); g.drawString("Name="+Name,1,10); } } ClassName.java

  5. applet 參數—提供外界目前applet所使用的參數資訊 getParameterInfo() Applet1 import java.awt.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; public class Applet1 extends JApplet{ public String [][] getParameterInfo( ){ String [][] 參數資訊 = { {“檔名”, “字串”, “這個參數是一個圖檔名稱”}, {“顏色”, “整數值”, “文字的顏色”} }; return 參數資訊 ; } } ClassName.java

  6. Applet 資源 getDocumentBase() : 傳回這個 applet 所在文件的 URL 位置 getCodeBase() : 傳回 applet 的類別檔案所在的 URL 位置 public class AppletDemo extends JApplet{ } public void paint(Graphics g){ String strDocumentBase=this.getDocumentBase().toString(); String strCodeBase=this.getCodeBase().toString(); g.drawString("CodeBase="+strCodeBase,1,10); g.drawString("DocumentBase="+strDocumentBase,1,100); } 目前這個class 檔的位置 目前這個html 檔的位置

  7. 控制瀏覽器 • 瀏覽器的狀態列: 一行文字指出瀏覽器目前的動作 • 顯示新的文件 showStatus("現在的狀態"); getAppletContext().showDocument(“www.kimo.com.tw”); *有可能被瀏覽器忽略

  8. 整理一下 Applet stub: 當 applet 被建立時,一個 Appletstub 會依附著它,提供瀏覽器 與 applet 之間的介面 • AppletStub 介面所提供的methods • boolean isActive(); • URL getDocumentBase(); • URL getCodeBase(); • String getParameter(String name); • AppletContext getAppletContext(); • void appletResize(int width, int height); • AppletContext 介面所提供的一些 methods • AudioClip getAudioClip(URL url); • Image getImage(URL url); • Applet getApplet(String name); • Enumeration getApplets(); • void showDocument(URL url); • public void showDocument(URL url, String target); • Void showStatus(String status);

  9. Applet 與 Application • 基本觀念是在 applet 中加入 main 方法並且提供一個 JFrame讓 applet 在其中執行 import java.applet.Applet; import java.awt.* import javax.swing.*; public class MySuperApplet extends JApplet{ public static void main(String [] args) { JApplet theApplet= new MySuperApplet(); // 將 applet 實體化 JFrame theFrame=new JFrame(); // 建立視窗讓 applet 執行 theFrame.setSize(200,200); theFrame.getContentPane().add(“Center”,theApplet); theApplet.init(); // 起始 applet theApplet.start(); theFrame.setVisible(true); // 顯示視窗 } } Applet 部分的程式碼 : init() start()

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