Question

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

我不是指可以由java命令的用户设置的系统属性（这将是无限列表），而是指运行时自行设置的属性（例如java.version，{{1等等）。

Answer 1

也许也有帮助：

显示JVM选择的有效属性值：
```
java -XshowSettings:all
```

Answer 2

赞：https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html？我说Oracle会有一个列表

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

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

虽然有些重复，但我认为前者的描述比后者更具信息性。后者列出了28个属性，而如果我打印所有属性，我的jvm以56响应，28中没有列出包括sun.*（12），*.awt.*（3），10个用户中的7个属性（country.format, country, script, variant, timezone, language, language.format）

Answer 3

要获得更好的打印输出方式，可以使用以下代码。请注意，此代码在环境和编程语言Processing中完全可用。（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]);
}

希望它有所帮助。 ;）

Answer 4

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));    
   }

您可以在http://javacodingnerd.blogspot.de/2017/03/java-how-to-gather-system-properties.html

找到示例

Answer 5

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));
}

您还可以从System.getEnv（）获取环境信息。

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

5 个答案: