从 Java 检查/获取 JAVA_HOME 变量
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Checking/getting JAVA_HOME Variable from Java
提问by antonio
Inside a Java program, how can I read the JAVA_HOMEvariable (to be sure it is set the correct way)?
Similarly, how can I get the path of the binfolder? That is, the path usually set in Windows via:
在 Java 程序中，如何读取JAVA_HOME变量（确保以正确的方式设置）？同样，如何获取bin文件夹的路径？也就是说，通常通过以下方式在 Windows 中设置路径：
path %path%;%JAVA_HOME%\bin
path %path%;%JAVA_HOME%\bin
Note: I am using the OpenJDK build by Alexkasko.
注意：我使用的是Alexkasko的 OpenJDK 版本。
回答by Thilo
Try
尝试
String javaHome = System.getProperty("java.home");
回答by David
Since both PATH and JAVA_HOME are environment variables, you should be able to read both of their values in a similar way:
由于 PATH 和 JAVA_HOME 都是环境变量，您应该能够以类似的方式读取它们的值：
String javaHome = System.getenv("JAVA_HOME");
String path = System.getenv("PATH");
回答by NINCOMPOOP
回答by Andrea Boscolo
You have to use System.getenv("JAVA_HOME");
你必须使用 System.getenv("JAVA_HOME");
回答by das Keks
On windows you could execute the setcommand from you application as you would do in your cmd and afterwards handle the output:
在 Windows 上，您可以set像在 cmd 中一样从应用程序执行命令，然后处理输出：
Process p;
p = Runtime.getRuntime().exec("set JAVA_HOME");
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
But as answered by the others
但正如其他人的回答
System.getenv("JAVA_HOME");
would be the nicer way.
将是更好的方式。
However if anyone needs an alternative, see above. :D
但是，如果有人需要替代方案，请参见上文。:D
