使用JavaScript检测Java版本

Question

有没有可靠的方法来检测使用JavaScript在客户端计算机上安装的Java版本？

Answer 1

查看Java Deployment Toolkit中的代码。

Answer 2

According to the fact that we're finding this page with google, just to help the next guys finding this.

Is Java installed?

navigator.javaEnabled()

http://www.w3schools.com/jsref/met_nav_javaenabled.asp

Which version of Java is installed?

<script src="http://www.java.com/js/deployJava.js"></script>
<script>
var versions = deployJava.getJREs();
</script>

http://java.sun.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html#deplToolkit

It's the best way I found to find the version of Java with JavaScript, but use it carefully because its version detection is really os/browser dependent, and on old browser version or on recent browser with old Java installed, it'll not work as expected. Take the time to do real tests before to use it in production.

Answer 3

Googling for

detect "java version" using javascript

yields a couple of results, this one looks like it might be useful. In essence, it tries to load a Java applet and then JavaScript asks the applet.

Answer 4

Version of Java:

 /** * @return NULL if not version found. Else return some things like: '1.6.0_31' */ var JavaVersion: function() { var result = null; // Walk through the full list of mime types. for( var i=0,size=navigator.mimeTypes.length; i<size; i++ ) { // The jpi-version is the plug-in version. This is the best // version to use. if( (result = navigator.mimeTypes[i].type.match(/^application\\/x-java-applet;jpi-version=(.*)$/)) !== null ) return result[1]; } return null; } 

Is Java and is Java enable:

 var IsJava: function() { return typeof(navigator.javaEnabled) !== 'undefined' && navigator.javaEnabled(); } 

These functions works on Opera, Firefox, Chrome. I havn't IE.

Answer 5

您可以从这里使用PluginDetect库： http ： //www.pinlady.net/PluginDetect/

Answer 6

The detection logic does not work in IE32 on Windows7-64. It could not detect the java version it installed earlier.

Well, after further reading, the Java Deployment Toolkit on Windows uses ActiveX classid which may pose your app to hackers (see http://www.kb.cert.org/vuls/id/886582 ). I am out.

Answer 7

I find that the JavaScript solution provided by the Java Deployment Toolkit gives an error... "deployJava.do_initialize is not a function".

One solution that I have used extensively for many years that does work in all browsers is the Java Version Display Applet . Unfortunately the original author's site seems to have disappeared, but you can download a copy of the Java Version Display Applet here.

Answer 8

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