如何从程序中找到 JVM 版本？

我想编写一个示例 Java 文件，其中我想知道类在其中运行的 JVM 版本。有办法吗？

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只是调用 System.getProperty("java.version")的一种情况。

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用途:

System.getProperty("java.version");

其中 java.version可以替换为与当前 Java 版本相关的许多其他系统属性之一。下面是他们的一张表:

 Property                        Value (OpenJDK 12)                        Value (Oracle JRE 8u201)                Value (Sun JRE 5u22)                                 Description
------------------------------- ----------------------------------------- --------------------------------------- ---------------------------------------------------- ---------------------------------------------------------------------------------------------------------------
java.version                    "12"                                      "1.8.0_201"                             "1.5.0_22"                                           Java Runtime Environment version, which may be interpreted as a Runtime.Version
java.version.date               "2019-03-19"                              null                                    null                                                 Java Runtime Environment version date, in ISO-8601 YYYY-MM-DD format, which may be interpreted as a LocalDate
java.vendor                     "Oracle Corporation"                      "Oracle Corporation"                    "Sun Microsystems Inc."                              Java Runtime Environment vendor
java.vendor.version             null                                      null                                    null                                                 Java vendor version
java.vendor.url                 "https://java.oracle.com/"                "http://java.oracle.com/"               "http://java.sun.com/"                               Java vendor URL
java.vendor.url.bug             "https://bugreport.java.com/bugreport/"   "http://bugreport.sun.com/bugreport/"   "http://java.sun.com/cgi-bin/bugreport.cgi"          Undocumented
java.specification.name         "Java Platform API Specification"         "Java Platform API Specification"       "Java Platform API Specification"                    Java Runtime Environment specification name
java.specification.vendor       "Oracle Corporation"                      "Oracle Corporation"                    "Sun Microsystems Inc."                              Java Runtime Environment specification vendor
java.specification.version      "12"                                      "1.8"                                   "1.5"                                                Java Runtime Environment specification version, whose value is the feature element of the runtime version
java.vm.name                    "OpenJDK 64-Bit Server VM"                "Java HotSpot(TM) 64-Bit Server VM"     "Java HotSpot(TM) 64-Bit Server VM"                  Java Virtual Machine implementation name
java.vm.vendor                  "Oracle Corporation"                      "Oracle Corporation"                    "Sun Microsystems Inc."                              Java Virtual Machine implementation vendor
java.vm.version                 "12+33"                                   "25.201-b09"                            "1.5.0_22-b03"                                       Java Virtual Machine implementation version which may be interpreted as a Runtime.Version
java.vm.info                    "mixed mode, sharing"                     "mixed mode"                            "mixed mode"                                         Undocumented
java.vm.specification.name      "Java Virtual Machine Specification"      "Java Virtual Machine Specification"    "Java Virtual Machine Specification"                 Java Virtual Machine specification name
java.vm.specification.vendor    "Oracle Corporation"                      "Oracle Corporation"                    "Sun Microsystems Inc."                              Java Virtual Machine specification vendor
java.vm.specification.version   "12"                                      "1.8"                                   "1.0"                                                Java Virtual Machine specification version, whose value is the feature element of the runtime version
java.runtime.name               "OpenJDK Runtime Environment"             "Java(TM) SE Runtime Environment"       "Java(TM) 2 Runtime Environment, Standard Edition"   Undocumented
java.runtime.version            "12+33"                                   "1.8.0_201-b09"                         "1.5.0_22-b03"                                       Undocumented
java.class.version              "56.0"                                    "52.0"                                  "49.0"                                               Java class format version number
jdk.debug                       "release"                                 null                                    null                                                 Undocumented
sun.java.launcher               "SUN_STANDARD"                            "SUN_STANDARD"                          "SUN_STANDARD"                                       Undocumented
sun.management.compiler         "HotSpot 64-Bit Tiered Compilers"         "HotSpot 64-Bit Tiered Compilers"       "HotSpot 64-Bit Server Compiler"                     Undocumented

资料来源:

  • 各种 JVM 版本的 java -XshowSettings:all -version输出。
  • 针对 System.getProperties()的 JavaAPI 参考文档
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最佳答案

System.getProperty("java.version")返回您需要的内容。

如果需要，还可以使用 JMX:

ManagementFactory.getRuntimeMXBean().getVmVersion()

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看来 java.specification.version是最适合这项工作的。

脑电图。

java.specification.version  1.6
java.version    1.6.0_23
java.vm.version 19.0-b09
java.runtime.version    1.6.0_23-b05
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有关版本的信息作为 System类的属性存储。

Http://docs.oracle.com/javase/6/docs/api/java/lang/system.html#getproperties%28%29

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下面的 Java 代码返回当前 IDE 中可用的 JVM版本

List<VirtualMachineDescriptor> descriptors = VirtualMachine.list();
for (VirtualMachineDescriptor descriptor : descriptors) {
System.out.println("Found JVM: " + descriptor.displayName());
try {
VirtualMachine vm = VirtualMachine.attach(descriptor);
String version = vm.getSystemProperties().getProperty("java.runtime.version");
System.out.println("   Runtime Version: " + version);


String connectorAddress = vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress");
if (connectorAddress == null) {


connectorAddress = vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress");
}


JMXServiceURL url = new JMXServiceURL(connectorAddress);
JMXConnector connector = JMXConnectorFactory.connect(url);
MBeanServerConnection mbs = connector.getMBeanServerConnection();


ObjectName threadName = new ObjectName(ManagementFactory.THREAD_MXBEAN_NAME);
Integer threadCount = (Integer)mbs.getAttribute(threadName, "ThreadCount");
System.out.println("    Thread count: " + threadCount);
}
catch (Exception e) {
// ...
}

产出:

Found JVM: /home/.../STS IDE/sts-bundle/sts-3.7.2.RELEASE//plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -os linux -ws gtk -arch x86_64 -showsplash -launcher /home/.../STS IDE/sts-bundle/sts-3.7.2.RELEASE/STS -name STS --launcher.library /home/.../STS IDE/sts-bundle/sts-3.7.2.RELEASE//plugins/org.eclipse.equinox.launcher.gtk.linux.x86_64_1.1.300.v20150602-1417/eclipse_1612.so -startup /home/.../STS IDE/sts-bundle/sts-3.7.2.RELEASE//plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar --launcher.overrideVmargs -exitdata 1ad000f -product org.springsource.sts.ide -vm /usr/bin/java -vmargs -Dosgi.requiredJavaVersion=1.7 -Xms40m -XX:MaxPermSize=256m -Xverify:none -Xmx1200m -jar /home/.../STS IDE/sts-bundle/sts-3.7.2.RELEASE//plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar
Runtime Version: 1.8.0_91-b14
Found JVM: com.intellij.idea.Main
Runtime Version: 1.8.0_91-b14
Found JVM: Test
Runtime Version: 1.7.0_80-b15
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GetProperty (“ sun.arch.data.model”) ;

Java 32位和64位控件

    Integer vers = Integer.parseInt(System.getProperty("java.version").split("\\.")[1]);
String bitMode = System.getProperty("sun.arch.data.model").toString();
System.out.println(vers);
System.out.println(bitMode);

产出:

6
32
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根据一个人的需要，其他的答案可能会有帮助。

在我的案例中，他们没有，我正在寻找 IBMJDK 的“完全限定”版本信息。

因此，“真正的”答案可以是: 只转储 所有系统属性，并检查是否有一个您正在寻找的属性。

在我的例子中，我发现 IBMJDK 知道一个

产权: Java.fullversion

JRE 1.8.0 IBM J92.8 Linux amd64-64压缩引用20161013 _ 322271(启用 JIT，启用 AOT)

J9VM-R28 _ Java8 _ SR3 _ 20161013 _ 1635 _ B322271

JIT-tr.r14.java.green _ 20161011 _ 125790

GC-R28 _ Java8 _ SR3 _ 20161013 _ 1635 _ B322271 _ CMPRSS J9CL-20161013 _ 322271

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只要打个电话,

System.out.println(System.getProperty("java.specification.version"));
System.out.println(System.getProperty("java.runtime.version"));

输出示例:

9
9+176
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从 Java9开始，我们有了一个新的静态方法: Version ()。

返回的对象有一些有趣的方法，比如 Feature ()或 compareToIgnoreOptions () ，这些方法可能更容易使用(例如 Runtime.version().feature() >= 11)。


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