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How to pass values from HTML page to java applet?

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孤独总比滥情好
孤独总比滥情好 2020-12-10 20:56

I have tried passing values using javascript like below
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  • 不思量自难忘°
    2020-12-10 21:15

    Source from this article

    For example: This is your applet codes:

    import java.applet.*;    
import java.awt.*; 

public class DrawStringApplet extends Applet {

  private String defaultMessage = "Hello!";

  public void paint(Graphics g) {

    String inputFromPage = this.getParameter("Message");
    if (inputFromPage == null) inputFromPage = defaultMessage;
    g.drawString(inputFromPage, 50, 25);

  }

}

    Then in HTML:

    <HTML>
<HEAD>
<TITLE> Draw String </TITLE>
</HEAD>

<BODY>
This is the applet:<P>
<APPLET code="DrawStringApplet" width="300" height="50">
<PARAM name="Message" value="Howdy, there!">
This page will be very boring if your 
browser doesn't understand Java.
</APPLET>
</BODY>
</HTML>

    Notice: DrawStringApplet is you applet name; Message is a parameter sent to applet; Applet will then display: Howdy, there! as a result.

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  • 生来不讨喜
    2020-12-10 21:42

    I think you can specify your parameters from javascript objects like so:

    <applet code="Calc.class" width="100" height="100">
    <param name="number" id="parm" value="&{num};">
</applet>

    However, I'm not sure of the compatibility with IE so you may have to document.write out your applet code injecting the respective parameter values like so:

    <head>
    <script type="text/javascript">
        var num;

        function getVal() {
            num = document.getElementById('in').value;

            writeAppletTags();
        }

        function writeAppletTags() { 
            var container = document.getElementById("applet-container");

            container.innerHTML = "<applet code=\"Calc.class\" width=\"100\" height=\"100\">";
            container.innerHTML += "<param name=\"number\" value=\"" + num + "\">";
            container.innerHTML += "</applet>";
        }
    </script> 
</head>
<body>
    Number : <input type="text" id="in"  ><br/>
    <button id="myBtn" onclick="getVal()">Try it</button><br/>  
    <div id="applet-container" />
</body>

    Sending POST from Java

    As I said in my comment, this is a little more complicated. You'd have to POST (you could also use GET) your values to a hosted file (can be any server side scripting technology). The following demonstrates this, code taken from here.

    URL url;
URLConnection urlConnection;
DataOutputStream outStream;
DataInputStream inStream;

// Build request body
String body = "key=value";

// Create connection
url = new URL("http://myhostedurl.com/receiving-page.php");
urlConnection = url.openConnection();
((HttpURLConnection)urlConnection).setRequestMethod("POST");
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
urlConnection.setUseCaches(false);
urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
urlConnection.setRequestProperty("Content-Length", ""+ body.length());

// Create I/O streams
outStream = new DataOutputStream(urlConnection.getOutputStream());
inStream = new DataInputStream(urlConnection.getInputStream());

// Send request
outStream.writeBytes(body);
outStream.flush();
outStream.close();

// Close I/O streams
inStream.close();
outStream.close();
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