Java System.getProperty() 方法识别的标准键的完整列表是什么？

What is the full list of standard keys recognized by the Java System.getProperty() method?

提问by Gustave

Is there a reference page that lists all the standard property keys that are always accepted by the Java System.getProperty(key)method?

是否有一个参考页面列出了 JavaSystem.getProperty(key)方法始终接受的所有标准属性键？

I am not referring to system properties that can be set by the user of the java command (this would be an unlimited list), but to the properties the runtime sets itself (such as java.version, java.specification.version, etc).

我不是指的是可以通过java命令的用户设置系统属性（这将是一个无限的列表），但对性能运行时将其自身设置（如java.version，java.specification.version等）。

回答by JFK

Maybe also helpful:

也许也有帮助：

• Show the effective property values your JVM picks up:

  java -XshowSettings:all
  

• 显示您的 JVM 选择的有效属性值：

  java -XshowSettings:all
  

回答by Danielson

Like: https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html? I'd say Oracle will have a list

像：https: //docs.oracle.com/javase/tutorial/essential/environment/sysprop.html？我会说甲骨文会有一个列表

Update (copied from link above):

更新（从上面的链接复制）：

"file.separator"    Character that separates components of a file path. This is "/" on UNIX and "\" on Windows.
"java.class.path"   Path used to find directories and JAR archives containing class files. Elements of the class path are separated by a platform-specific character specified in the path.separator property.
"java.home"         Installation directory for Java Runtime Environment (JRE)
"java.vendor"       JRE vendor name
"java.vendor.url"   JRE vendor URL
"java.version"      JRE version number
"line.separator"    Sequence used by operating system to separate lines in text files
"os.arch"           Operating system architecture
"os.name"           Operating system name
"os.version"        Operating system version
"path.separator"    Path separator character used in java.class.path
"user.dir"          User working directory
"user.home"         User home directory
"user.name"         User account name

A more complete list from https://docs.oracle.com/javase/8/docs/api/java/lang/System.html

来自https://docs.oracle.com/javase/8/docs/api/java/lang/System.html 的更完整列表

java.version                    Java Runtime Environment version
java.vendor                     Java Runtime Environment vendor
java.vendor.url                 Java vendor URL
java.home                       Java installation directory
java.vm.specification.version   Java Virtual Machine specification version
java.vm.specification.vendor    Java Virtual Machine specification vendor
java.vm.specification.name      Java Virtual Machine specification name
java.vm.version                 Java Virtual Machine implementation version
java.vm.vendor                  Java Virtual Machine implementation vendor
java.vm.name                    Java Virtual Machine implementation name
java.specification.version      Java Runtime Environment specification version
java.specification.vendor       Java Runtime Environment specification vendor
java.specification.name         Java Runtime Environment specification name
java.class.version              Java class format version number
java.class.path                 Java class path
java.library.path               List of paths to search when loading libraries
java.io.tmpdir                  Default temp file path
java.compiler                   Name of JIT compiler to use
java.ext.dirs                   Path of extension directory or directories Deprecated. This property, and the mechanism which implements it, may be removed in a future release.
os.name                         Operating system name
os.arch                         Operating system architecture
os.version                      Operating system version
file.separator                  File separator ("/" on UNIX)
path.separator                  Path separator (":" on UNIX)
line.separator                  Line separator ("\n" on UNIX)
user.name                       User's account name
user.home                       User's home directory
user.dir                        User's current working directory

Although some duplicates, I think the former descriptions are more informative than the latter. The latter lists 28 properties, whereas if I print all the properties, my jvm responds with 56, some not listed in the 28 include sun.*(12), *.awt.*(3), 7 out of 10 user properties (country.format, country, script, variant, timezone, language, language.format)

虽然有些重复，但我认为前者的描述比后者提供的信息更多。后者列出了 28 个属性，而如果我打印所有属性，我的 jvm 响应为 56，其中一些未列在 28 中包括sun.*(12)、*.awt.*(3)、10 个用户属性中的 7 个 ( country.format, country, script, variant, timezone, language, language.format)

回答by abel

For a better way of printing the output, you may use the following code. Note that this code is completely functional in the environment and programming language Processing. (Yes, it is Java based)

为了更好地打印输出，您可以使用以下代码。请注意，此代码在环境和编程语言Processing 中完全起作用。（是的，它是基于 Java 的）

String Junk = System.getProperties().toString();
Junk = Junk.replace("}", "").replace("{", "");
String Separated [] = split(Junk, ", ");
for(int S = 0; S < Separated.length; S ++) {
  String splitFurther [] = split(Separated [S], "=");
println("Key: " + splitFurther [0] + "\n\tProperty: " + splitFurther [1]);
}

Hope it helps. ;)

希望能帮助到你。;)

回答by CanGu

You can display all properties and their settings on you console using following code

您可以使用以下代码在控制台上显示所有属性及其设置

    //Properties inherits form Hashtable and holds the
    //Information of what the Propertie is called (key)
    //and what the Propertie really is (value)
    Properties props = System.getProperties();

    //We want to loop through the entrys using the Keyset
    Set<object> propKeySet = props.keySet();

   for (Object singleKey : propKeySet) {
   System.out.println(singleKey += props.getProperty((String) singleKey));    
   }

You can find an example here http://javacodingnerd.blogspot.de/2017/03/java-how-to-gather-system-properties.html

你可以在这里找到一个例子 http://javacodingnerd.blogspot.de/2017/03/java-how-to-gather-system-properties.html

回答by Johnson Abraham

You can use this code to get the system properties:

您可以使用此代码获取系统属性：

import java.util.Properties;
import java.util.Enumeration;

Properties props = System.getProperties();
Enumeration propNames = props.propertyNames();
for (; propNames.hasMoreElements();) {
    String key = propNames.nextElement().toString();
    System.out.println(key + " : " + props.getProperty(key));
}

You can also get the environment information from System.getEnv().

您还可以从 System.getEnv() 获取环境信息。