这是一个准后续
出于安全原因，我有一个限制，即 javascript 不应初始化java 插件（也不使用 deployJava，后者又使用插件）。
也不应使用小程序。
我还能如何检测 java 版本？
问问题
3113 次
1 回答
6
这是我从链接线程上的唯一答案拼凑而成的一些原始脚本，它接近有用并且不使用部署工具包脚本。
mimeTypes当前的尝试对于支持对象的&plugins的浏览器很好navigator。对于 IE，它使用 ActiveX（可以检测 JRE 系列）。
javainfo.js
// As a version string, this might be '1.4.2_31'.
// I.E. it is not a 'number' but a 'string' and therefore must be treated as a string.
var highestVersion = 'undefined';
// not available in IE, but all other known desktop browsers
var mimes = window.navigator.mimeTypes;
// not available in IE, but all other known desktop browsers
var plugins = window.navigator.plugins;
function isJava() {
return (
typeof(navigator.javaEnabled) !== 'undefined' &&
navigator.javaEnabled());
}
function getVersion() {
var version = 0;
if (isJava()) {
version = 1.1;
}
for (var ii=0; ii<mimes.length; ii++) {
var t = mimes[ii].type;
if (t.indexOf("java")>0 &&
t.indexOf("jpi")>0 &&
t.indexOf("applet")>0
) {
var parts = t.split("=");
version = parts[parts.length-1];
}
}
if (highestVersion=='undefined') highestVersion = version;
return version;
}
function isJWS() {
var ver = highestVersion;
var className = false;
if (ver>'1.0') {
className = undefined;
}
if (ver>'1.4.2') {
className = true;
}
return className;
}
function isPlugin2() {
var ver = highestVersion;
var className = false;
if (ver>'1.0') {
className = undefined;
}
if (ver>'1.6.0_10') {
className = true;
}
return className;
}
function getIEVersion() {
if (testUsingActiveX('1.9.0')) {
return '1.9.0';
} else if (testUsingActiveX('1.8.0')) {
return '1.8.0';
} else if (testUsingActiveX('1.7.0')) {
return '1.7.0';
} else if (testUsingActiveX('1.6.0')) {
return '1.6.0';
} else if (testUsingActiveX('1.5.0')) {
return '1.5.0';
} else if (testUsingActiveX('1.4.2')) {
return '1.4.2';
}
return false;
}
if (supportsActiveX() && getVersion()=='1.1') {
highestVersion = getIEVersion();
}
/** This checks directly for the support for ActiveX.
Internet Explorer 11 completely dropped support for ActiveX. */
function supportsActiveX() {
return typeof window.ActiveXObject != 'undefined';
}
/*
A fragile way to determine either 'IE' or 'ActiveX support'.
function isIE() {
// return navigator.appName=='Microsoft Internet Explorer';
// return navigator.appVersion.indexOf(".NET CLR")>0
return supportsActiveX();
}
*/
function testUsingActiveX(version) {
var objectName = 'JavaWebStart.isInstalled.' + version + '.0';
// we need the typeof check here for this to run on FF/Chrome
// the check needs to be in place here - cannot even pass ActiveXObject
// as arg to another function
if (typeof ActiveXObject == 'undefined' || !ActiveXObject) {
alert('[testUsingActiveX()] Browser claims to be IE, but no ActiveXObject object?');
return false;
}
try {
return (new ActiveXObject(objectName) != null);
} catch (exception) {
return false;
}
}
function get3CellRow(cell1, cell2, cell3) {
var s = "" +
"<tr>" +
"<td class='" +
getClassName(cell1) +
"'>" +
cell1 +
"</td>" +
getDataStyledCell(cell2) +
"<td class='" +
getClassName(cell3) +
"'>" +
cell3 +
"</td>" +
"</tr>" +
"";
return s;
}
function getDataStyledCell(value) {
var s = "<td class='datum " +
getClassName(value) +
"'>" +
value +
"</td>";
return s;
}
function getClassName(val) {
var className = undefined;
if (
(val) ||
(!val) ||
(val!=="undefined")
) {
className = val;
}
return className;
}
function getBrowserInfo() {
var s = "";
var props = [
'appCodeName','appName','appVersion',
'userAgent',
'platform','cookieEnabled'
];
s += "<table border='1'>";
for (var i=0; i<props.length; i++) {
s+= "<tr>";
s+= "<td><b>";
s+= props[i];
s+= "</b></td>";
s+= "<td>";
s+= navigator[props[i]];
s+= "</td>";
s+= "</tr>";
}
s += "</table>";
return s;
}
这是我用来查看结果信息的典型 HTML。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Java Information - Non Deployment Toolkit Script</title>
<meta name='author' content='Andrew Thompson'>
<meta name='description' content='Non Deployment Toolkit Script'>
<script src='javainfo.js'></script>
<style type='text/css'>
.true {
background-color: #6F6;
}
.false {
background-color: #FB0;
}
.undefined {
background-color: #FF0;
}
.datum {
font-family: monospace;
}
td {
padding: 4px;
}
</style>
</head>
<body>
<h1>Java on this PC</h1>
<h2>Overview</h2>
<p>This page endeavors to ascertain the installation, availability
& version of the Java installed on the client PC.
More importantly, it attempts to discover the information <b>without
invoking the Java Plug-In</b> itself.
The last part is what makes it different
to the Deployment Toolkit Script supplied by Oracle.
</p>
<script type='text/javascript'>
document.write("<h2>Browser Info.</h2>");
document.write(getBrowserInfo());
document.write("<h2>Basic Info.</h2>");
document.write("<table border='1'>");
document.write(get3CellRow('<b>Enabled</b>', isJava(), 'Java is enabled (1.1+) - IE info. (short of ActiveX) stops here'));
document.write(get3CellRow('<b>Version</b>', getVersion(), 'Maximum version reliably <em>known</em> to be available'));
if (supportsActiveX()) {
document.write(get3CellRow('<b>MSIE</b>', getIEVersion(), 'Maximum version reliably known to be available in IE, tested using ActiveX'));
}
document.write(get3CellRow('<b>JWS</b>', isJWS(), 'Java Web Start available (1.4.2+)'));
document.write(get3CellRow('<b>Plug-In 2</b>', isPlugin2(), 'Plug-In 2 available (1.6.0_10+)'));
document.write("</table>");
if (plugins.length>0) {
document.write("<h2>Navigator Plug-Ins</h2>");
document.write("<table border='1'>");
document.write("<tr><th>Name</th><th>Version</th><th>File Name</th><th>Description</th></tr>");
for (var ii=0; ii<plugins.length; ii++) {
var t = plugins[ii].name;
if (t.indexOf("Java")>-1) {
document.write("<tr>");
document.write("<td>" + plugins[ii].name + "</td>");
document.write(getDataStyledCell(plugins[ii].version));
document.write("<td>" + plugins[ii].filename + "</td>");
document.write("<td>" + plugins[ii].description + "</td>");
document.write("</tr>");
}
}
document.write("</table>");
}
if (mimes.length>0) {
document.write("<h2>Navigator Mime-Types</h2>");
document.write("<table border='1'>");
document.write("<tr><th>Mime</th><th>Description</th><th>Types</th></tr>");
for (var ii=0; ii<mimes.length; ii++) {
var t = mimes[ii].type;
if (t.indexOf("java")>0 &&
((t.indexOf("jpi")>0 || t.indexOf("deploy")>0 || t.indexOf("vm")>0) ||
mimes[ii].description.length>0)
) {
document.write("<tr>");
document.write("<td>" + mimes[ii].type + "</td>");
document.write("<td>" + mimes[ii].description + "</td>");
document.write("<td>" + mimes[ii].suffixes + "</td>");
document.write("</tr>");
}
}
document.write("</table>");
}
</script>
<hr>
<h2>Description</h2>
<p>In order (if available) the information is:
<ul>
<li><b>Browser info. Table:</b> Not strictly related to Java - the
information in the other tables is determined without
further reference to any information shown in this table (except for the <code>appName</code> used for
identifying IE).
OTOH it is an helpful guide
as to what we should be <em>expecting</em>
from the other information. E.G. IE
will not show the Plug-In or Mime Type tables. <em>Only</em>
FF displays the plug-in version numbers.
</li>
<li><b>Basic info. Table</b>
<ul>
<li><b>Enabled</b>: Java is known to this browser and enabled, according to JavaScript <code>navigator.javaEnabled()</code>.</li>
<li><b>Version</b>: The maximum Java version known to be supported in this browser/PC.
It is set to <code>1.1</code> if the previous check is <code>true</code>, since the MSVM
was the first Java version the public could get in a browser, and the MSVM
implemented Java 1.1. Goes on to check
<code>application/x-java-applet;jpi-version</code>
in the mime types if available
(i.e. typically browsers that are <em>not</em> IE).
</li>
<li><b>MSIE</b> (IE Only): The maximum Java version known to be supported by this instance of Internet Explorer
as determined using ActiveX. It runs from 1.4.2, 1.5.0.. through 1.9.0.
</li>
<li><b>JWS</b>:
Inferred from a comparison of the version to the Sun JRE in which
it was co-bundled or introduced.</li>
<li><b>Plug-In 2</b>:
Inferred from a comparison of the version to the Sun JRE in which
it was co-bundled or introduced.</li>
</ul>
</li>
<li><b>Navigator Object Tables:</b>
<em>The rest of the info. is gleaned from the <code>navigator</code> object.
IE does not include this information.</em>
<ul>
<li><b>Plug-Ins</b>: More details of the Java related plugins.
Filtered for <code>Java</code> in the <code>name</code>.
A <code>description</code> showing "Next Generation Java Plug-in" or <code>name</code>
"Java Deployment Toolkit" should be 1.6.0_10+.</li>
<li><b>Mime-Types</b>: More information on the Java related Mime-Types.
Filtered in <code>mime</code> field for <code>'java'</code> + <code>('jpi'||'vm'||'deploy')</code>
or a non-empty <code>description</code>.
The value <code>java-deployment-toolkit</code> in the <code>mime</code>
is a good indicator of 1.6.0_10+.
</li>
</ul>
</li>
</ul>
</body>
</html>
输出
火狐
Browser Info.
appCodeName Mozilla
appName Netscape
appVersion 5.0 (Windows)
userAgent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0
platform Win32
cookieEnabled true
Basic Info.
Enabled true Java is enabled (1.1+) - IE info. stops here
Version 1.7.0_25 Maximum version reliably known to be available
JWS true Java Web Start available (1.4.2+)
Plug-In 2 true Plug-In 2 available (1.6.0_10+)
Navigator Plug-Ins
Name Version File Name Description
Java(TM) Platform SE 7 U25 10.25.2.17 npjp2.dll Next Generation Java Plug-in 10.25.2 for Mozilla browsers
Java Deployment Toolkit 7.0.250.17 10.25.2.17 npdeployJava1.dll NPRuntime Script Plug-in Library for Java(TM) Deploy
Navigator Mime-Types
Mime Description Types
application/x-java-applet Java Applet
application/x-java-bean JavaBeans
application/x-java-vm
application/x-java-applet;jpi-version=1.7.0_25
application/x-java-bean;jpi-version=1.7.0_25
application/x-java-vm-npruntime
application/x-java-applet;deploy=10.25.2
application/java-deployment-toolkit
铬合金
Browser Info.
appCodeName Mozilla
appName Netscape
appVersion 5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36
userAgent Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36
platform Win32
cookieEnabled true
Basic Info.
Enabled true Java is enabled (1.1+) - IE info. stops here
Version 1.7.0_25 Maximum version reliably known to be available
JWS true Java Web Start available (1.4.2+)
Plug-In 2 true Plug-In 2 available (1.6.0_10+)
Navigator Plug-Ins
Name Version File Name Description
Java(TM) Platform SE 7 U25 undefined npjp2.dll Next Generation Java Plug-in 10.25.2 for Mozilla browsers
Java Deployment Toolkit 7.0.250.17 undefined npDeployJava1.dll NPRuntime Script Plug-in Library for Java(TM) Deploy
Navigator Mime-Types
Mime Description Types
application/x-java-applet Java Applet
application/x-java-bean JavaBeans
application/x-java-vm
application/x-java-applet;jpi-version=1.7.0_25
application/x-java-bean;jpi-version=1.7.0_25
application/x-java-vm-npruntime
application/x-java-applet;deploy=10.25.2
application/java-deployment-toolkit
（注意： 从图像中修剪导航器 Mime-Types，因为它与 FF 具有相同的信息。）
IE浏览器
Browser Info.
appCodeName Mozilla
appName Microsoft Internet Explorer
appVersion 5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; AskTbORJ/5.15.25.36191)
userAgent Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; AskTbORJ/5.15.25.36191)
platform Win32
cookieEnabled true
Basic Info.
Enabled true Java is enabled (1.1+) - IE info. (short of ActiveX) stops here
Version 1.1 Maximum version reliably known to be available
MSIE 1.7.0 Maximum version reliably known to be available in IE, tested using ActiveX
JWS true Java Web Start available (1.4.2+)
Plug-In 2 true Plug-In 2 available (1.6.0_10+)
互联网浏览器 11+
Internet Explorer 11 已放弃对 ActiveX 的支持，因此它可能会出现这种情况。
从好的方面来说，如果这是 Internet Explorer 11+ 并且启用了 Java，那么它至少会安装 Java 1.7.0。从 Java 1.6 开始，Java 一直默认自动更新。所以这个浏览器在逻辑上（至少在默认选项下）会拥有最新的 JRE 版本。
于 2013-08-19T01:41:13.703 回答