问题
I have a webpage where I have a button. What I want to achieve is whenever I click on this button , it should call a java method named getMessage() which is present inside a java program. After calling this method it displays a greeting on the screen. I read that calling java functions from javascript is not a good idea. That's why I am trying to achieve above effect using ajax.
My html file : index.html =>
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<script language="javascript">
function openMsg()
{
var msg = //code that makes a call to getMessage() from a java file and returns the response say "Good Morning..! "
document.getElementById("print").innerHTML = msg;
}
</script>
</head>
<body>
<button onclick="openMsg();">Click to open message</button>
<p id="print"></p>
</body>
</html>
My java file : Example.java =>
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JApplet;
public class Example extends JApplet{
public void start()
{
}
public void init()
{
setBackground(Color.blue);
}
public void paint(Graphics g)
{
g.drawString("Hello World !", 100, 100);
}
public void getMessage()
{
System.out.println("Good Morning..!!!");
}
}
Please help me...
来源：https://stackoverflow.com/questions/40104912/how-to-call-java-methods-from-javascript-using-ajax