Package io.microsphere.util

Class SystemUtils

  • All Implemented Interfaces:
    Utils
    public abstract class SystemUtils
extends java.lang.Object
implements Utils
    The utilities class for System
    Since:
    1.0.0
    Author:
    Mercy
    See Also:
    System

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String FILE_ENCODING
      The System property for the file encoding, the default is "UTF-8"
      static java.lang.String FILE_ENCODING_PROPERTY_KEY
      The System property key for the file encoding : "file.encoding"
      static java.lang.String FILE_SEPARATOR_PROPERTY_KEY
      The System property key for the File separator ("/" on UNIX) : "file.separator"
      static boolean IS_JAVA_10
      Is true if this is Java version 10.x
      static boolean IS_JAVA_11
      Is true if this is Java version 11.x
      static boolean IS_JAVA_12
      Is true if this is Java version 12.x
      static boolean IS_JAVA_13
      Is true if this is Java version 13.x
      static boolean IS_JAVA_14
      Is true if this is Java version 14.x
      static boolean IS_JAVA_15
      Is true if this is Java version 15.x
      static boolean IS_JAVA_16
      Is true if this is Java version 16.x
      static boolean IS_JAVA_17
      Is true if this is Java version 17.x
      static boolean IS_JAVA_18
      Is true if this is Java version 18.x
      static boolean IS_JAVA_19
      Is true if this is Java version 19.x
      static boolean IS_JAVA_20
      Is true if this is Java version 20.x
      static boolean IS_JAVA_21
      Is true if this is Java version 21.x
      static boolean IS_JAVA_22
      Is true if this is Java version 22.x
      static boolean IS_JAVA_23
      Is true if this is Java version 23.x
      static boolean IS_JAVA_24
      Is true if this is Java version 24.x
      static boolean IS_JAVA_8
      Is true if this is Java 8
      static boolean IS_JAVA_9
      Is true if this is Java version 9.x
      static boolean IS_LTS_JAVA_VERSION
      Is true if current Java version is Long Term Supported(LTS)
      static boolean IS_OS_WINDOWS
      Is true if this is Windows.
      static java.lang.String JAVA_CLASS_PATH
      The System property for the Java class path.
      static java.lang.String JAVA_CLASS_PATH_PROPERTY_KEY
      The System property key for the Java class path : "java.class.path"
      static java.lang.String JAVA_CLASS_VERSION
      The System property for the Java class format version number.
      static java.lang.String JAVA_CLASS_VERSION_PROPERTY_KEY
      The System property key for the Java class format version number : "java.class.version"
      static java.lang.String JAVA_COMPILER
      The System property for the Name of JIT compiler to use.
      static java.lang.String JAVA_COMPILER_PROPERTY_KEY
      The System property key for the Name of JIT compiler to use : "java.compiler"
      static java.lang.String JAVA_EXT_DIRS
      The System property for the Path of extension directory or directories Deprecated.
      static java.lang.String JAVA_EXT_DIRS_PROPERTY_KEY
      Deprecated. 
      static java.lang.String JAVA_HOME
      The System property for the Java installation directory.
      static java.lang.String JAVA_HOME_PROPERTY_KEY
      The System property key for the Java installation directory : "java.home"
      static java.lang.String JAVA_IO_TMPDIR
      The System property for the Default temp file path.
      static java.lang.String JAVA_IO_TMPDIR_PROPERTY_KEY
      The System property key for the Default temp file path : "java.io.tmpdir"
      static java.lang.String JAVA_LIBRARY_PATH
      The System property for the List of paths to search when loading libraries.
      static java.lang.String JAVA_LIBRARY_PATH_PROPERTY_KEY
      The System property key for the List of paths to search when loading libraries : "java.library.path"
      static java.lang.String JAVA_SPECIFICATION_NAME
      The System property for the Java Runtime Environment specification name.
      static java.lang.String JAVA_SPECIFICATION_NAME_PROPERTY_KEY
      The System property key for the Java Runtime Environment specification name : "java.specification.name"
      static java.lang.String JAVA_SPECIFICATION_VENDOR
      The System property for the Java Runtime Environment specification vendor.
      static java.lang.String JAVA_SPECIFICATION_VENDOR_PROPERTY_KEY
      The System property key for the Java Runtime Environment specification vendor : "java.specification.vendor"
      static java.lang.String JAVA_SPECIFICATION_VERSION
      The System property for the Java Runtime Environment specification version.
      static java.lang.String JAVA_SPECIFICATION_VERSION_PROPERTY_KEY
      The System property key for the Java Runtime Environment specification version : "java.specification.version"
      static java.lang.String JAVA_VENDOR
      The System property for the Java Runtime Environment vendor.
      static java.lang.String JAVA_VENDOR_PROPERTY_KEY
      The System property key for the Java Runtime Environment vendor : "java.vendor"
      static java.lang.String JAVA_VENDOR_URL
      The System property for the Java vendor URL.
      static java.lang.String JAVA_VENDOR_URL_PROPERTY_KEY
      The System property key for the Java vendor URL : "java.vendor.url"
      static java.lang.String JAVA_VERSION
      The System property for the Java Runtime Environment version.
      static java.lang.String JAVA_VERSION_PROPERTY_KEY
      The System property key for the Java Runtime Environment version : "java.version"
      static java.lang.String JAVA_VM_NAME
      The System property for the Java Virtual Machine implementation name.
      static java.lang.String JAVA_VM_NAME_PROPERTY_KEY
      The System property key for the Java Virtual Machine implementation name : "java.vm.name"
      static java.lang.String JAVA_VM_SPECIFICATION_NAME
      The System property for the Java Virtual Machine specification name.
      static java.lang.String JAVA_VM_SPECIFICATION_NAME_PROPERTY_KEY
      The System property key for the Java Virtual Machine specification name : "java.vm.specification.name"
      static java.lang.String JAVA_VM_SPECIFICATION_VENDOR
      The System property for the Java Virtual Machine specification vendor.
      static java.lang.String JAVA_VM_SPECIFICATION_VENDOR_PROPERTY_KEY
      The System property key for the Java Virtual Machine specification vendor : "java.vm.specification.vendor"
      static java.lang.String JAVA_VM_SPECIFICATION_VERSION
      The System property for the Java Virtual Machine specification version.
      static java.lang.String JAVA_VM_SPECIFICATION_VERSION_PROPERTY_KEY
      The System property key for the Java Virtual Machine specification version : "java.vm.specification.version"
      static java.lang.String JAVA_VM_VENDOR
      The System property for the Java Virtual Machine implementation vendor.
      static java.lang.String JAVA_VM_VENDOR_PROPERTY_KEY
      The System property key for the Java Virtual Machine implementation vendor : "java.vm.vendor"
      static java.lang.String JAVA_VM_VERSION
      The System property for the Java Virtual Machine implementation version.
      static java.lang.String JAVA_VM_VERSION_PROPERTY_KEY
      The System property key for the Java Virtual Machine implementation version : "java.vm.version"
      static java.lang.String LINE_SEPARATOR_PROPERTY_KEY
      The System property key for the Line separator ("\n" on UNIX) : "line.separator"
      static java.lang.String NATIVE_ENCODING
      The System property for the native encoding
      static java.lang.String NATIVE_ENCODING_PROPERTY_KEY
      The System property key for the native encoding : "native.encoding"
      static java.lang.String OS_ARCH
      The System property for the Operating system architecture.
      static java.lang.String OS_ARCH_PROPERTY_KEY
      The System property key for the Operating system architecture : "os.arch"
      static java.lang.String OS_NAME
      The System property for the Operating system name.
      static java.lang.String OS_NAME_PROPERTY_KEY
      The System property key for the Operating system name : "os.name"
      static java.lang.String OS_NAME_WINDOWS_PREFIX  
      static java.lang.String OS_VERSION
      The System property for the Operating system version.
      static java.lang.String OS_VERSION_PROPERTY_KEY
      The System property key for the Operating system version : "os.version"
      static java.lang.String PATH_SEPARATOR_PROPERTY_KEY
      The System property key for the Path separator (":" on UNIX) : "path.separator"
      static java.lang.String USER_DIR
      The System property for the User's current working directory.
      static java.lang.String USER_DIR_PROPERTY_KEY
      The System property key for the User's current working directory : "user.dir"
      static java.lang.String USER_HOME
      The System property for the User's home directory.
      static java.lang.String USER_HOME_PROPERTY_KEY
      The System property key for the User's home directory : "user.home"
      static java.lang.String USER_NAME
      The System property for the User's account name.
      static java.lang.String USER_NAME_PROPERTY_KEY
      The System property key for the User's account name : "user.name"

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.String getSystemProperty​(java.lang.String key)
      Gets a system property with the given key, defaulting to null if the property cannot be read.
      static java.lang.String getSystemProperty​(java.lang.String key, java.lang.String defaultValue)
      Gets a system property with the given key, defaulting to the provided defaultValue if the property cannot be read.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • OS_NAME_WINDOWS_PREFIX

        public static final java.lang.String OS_NAME_WINDOWS_PREFIX
        See Also:
        Constant Field Values

      • JAVA_CLASS_PATH_PROPERTY_KEY

        public static final java.lang.String JAVA_CLASS_PATH_PROPERTY_KEY
        The System property key for the Java class path : "java.class.path"
        See Also:
        Constant Field Values

      • USER_NAME_PROPERTY_KEY

        public static final java.lang.String USER_NAME_PROPERTY_KEY
        The System property key for the User's account name : "user.name"
        See Also:
        Constant Field Values

      • JAVA_EXT_DIRS_PROPERTY_KEY

        @Deprecated
public static final java.lang.String JAVA_EXT_DIRS_PROPERTY_KEY
        Deprecated.
        The System property key for the Path of extension directory or directories Deprecated. This property, and the mechanism which implements it, may be removed in a future release : "java.ext.dirs"
        See Also:
        Constant Field Values

      • JAVA_VENDOR_PROPERTY_KEY

        public static final java.lang.String JAVA_VENDOR_PROPERTY_KEY
        The System property key for the Java Runtime Environment vendor : "java.vendor"
        See Also:
        Constant Field Values

      • JAVA_SPECIFICATION_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_SPECIFICATION_VERSION_PROPERTY_KEY
        The System property key for the Java Runtime Environment specification version : "java.specification.version"
        See Also:
        Constant Field Values

      • LINE_SEPARATOR_PROPERTY_KEY

        public static final java.lang.String LINE_SEPARATOR_PROPERTY_KEY
        The System property key for the Line separator ("\n" on UNIX) : "line.separator"
        See Also:
        Constant Field Values

      • JAVA_CLASS_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_CLASS_VERSION_PROPERTY_KEY
        The System property key for the Java class format version number : "java.class.version"
        See Also:
        Constant Field Values

      • JAVA_SPECIFICATION_NAME_PROPERTY_KEY

        public static final java.lang.String JAVA_SPECIFICATION_NAME_PROPERTY_KEY
        The System property key for the Java Runtime Environment specification name : "java.specification.name"
        See Also:
        Constant Field Values

      • JAVA_VENDOR_URL_PROPERTY_KEY

        public static final java.lang.String JAVA_VENDOR_URL_PROPERTY_KEY
        The System property key for the Java vendor URL : "java.vendor.url"
        See Also:
        Constant Field Values

      • JAVA_VM_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_VERSION_PROPERTY_KEY
        The System property key for the Java Virtual Machine implementation version : "java.vm.version"
        See Also:
        Constant Field Values

      • OS_NAME_PROPERTY_KEY

        public static final java.lang.String OS_NAME_PROPERTY_KEY
        The System property key for the Operating system name : "os.name"
        See Also:
        Constant Field Values

      • OS_ARCH_PROPERTY_KEY

        public static final java.lang.String OS_ARCH_PROPERTY_KEY
        The System property key for the Operating system architecture : "os.arch"
        See Also:
        Constant Field Values

      • JAVA_HOME_PROPERTY_KEY

        public static final java.lang.String JAVA_HOME_PROPERTY_KEY
        The System property key for the Java installation directory : "java.home"
        See Also:
        Constant Field Values

      • OS_VERSION_PROPERTY_KEY

        public static final java.lang.String OS_VERSION_PROPERTY_KEY
        The System property key for the Operating system version : "os.version"
        See Also:
        Constant Field Values

      • JAVA_COMPILER_PROPERTY_KEY

        public static final java.lang.String JAVA_COMPILER_PROPERTY_KEY
        The System property key for the Name of JIT compiler to use : "java.compiler"
        See Also:
        Constant Field Values

      • JAVA_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_VERSION_PROPERTY_KEY
        The System property key for the Java Runtime Environment version : "java.version"
        See Also:
        Constant Field Values

      • JAVA_VM_SPECIFICATION_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_SPECIFICATION_VERSION_PROPERTY_KEY
        The System property key for the Java Virtual Machine specification version : "java.vm.specification.version"
        See Also:
        Constant Field Values

      • USER_DIR_PROPERTY_KEY

        public static final java.lang.String USER_DIR_PROPERTY_KEY
        The System property key for the User's current working directory : "user.dir"
        See Also:
        Constant Field Values

      • JAVA_SPECIFICATION_VENDOR_PROPERTY_KEY

        public static final java.lang.String JAVA_SPECIFICATION_VENDOR_PROPERTY_KEY
        The System property key for the Java Runtime Environment specification vendor : "java.specification.vendor"
        See Also:
        Constant Field Values

      • JAVA_VM_SPECIFICATION_NAME_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_SPECIFICATION_NAME_PROPERTY_KEY
        The System property key for the Java Virtual Machine specification name : "java.vm.specification.name"
        See Also:
        Constant Field Values

      • JAVA_VM_VENDOR_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_VENDOR_PROPERTY_KEY
        The System property key for the Java Virtual Machine implementation vendor : "java.vm.vendor"
        See Also:
        Constant Field Values

      • FILE_SEPARATOR_PROPERTY_KEY

        public static final java.lang.String FILE_SEPARATOR_PROPERTY_KEY
        The System property key for the File separator ("/" on UNIX) : "file.separator"
        See Also:
        Constant Field Values

      • PATH_SEPARATOR_PROPERTY_KEY

        public static final java.lang.String PATH_SEPARATOR_PROPERTY_KEY
        The System property key for the Path separator (":" on UNIX) : "path.separator"
        See Also:
        Constant Field Values

      • JAVA_LIBRARY_PATH_PROPERTY_KEY

        public static final java.lang.String JAVA_LIBRARY_PATH_PROPERTY_KEY
        The System property key for the List of paths to search when loading libraries : "java.library.path"
        See Also:
        Constant Field Values

      • USER_HOME_PROPERTY_KEY

        public static final java.lang.String USER_HOME_PROPERTY_KEY
        The System property key for the User's home directory : "user.home"
        See Also:
        Constant Field Values

      • JAVA_VM_NAME_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_NAME_PROPERTY_KEY
        The System property key for the Java Virtual Machine implementation name : "java.vm.name"
        See Also:
        Constant Field Values

      • JAVA_VM_SPECIFICATION_VENDOR_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_SPECIFICATION_VENDOR_PROPERTY_KEY
        The System property key for the Java Virtual Machine specification vendor : "java.vm.specification.vendor"
        See Also:
        Constant Field Values

      • JAVA_IO_TMPDIR_PROPERTY_KEY

        public static final java.lang.String JAVA_IO_TMPDIR_PROPERTY_KEY
        The System property key for the Default temp file path : "java.io.tmpdir"
        See Also:
        Constant Field Values

      • FILE_ENCODING_PROPERTY_KEY

        public static final java.lang.String FILE_ENCODING_PROPERTY_KEY
        The System property key for the file encoding : "file.encoding"
        See Also:
        Constant Field Values

      • NATIVE_ENCODING_PROPERTY_KEY

        public static final java.lang.String NATIVE_ENCODING_PROPERTY_KEY
        The System property key for the native encoding : "native.encoding"
        See Also:
        Constant Field Values

      • JAVA_CLASS_PATH

        public static final java.lang.String JAVA_CLASS_PATH
        The System property for the Java class path.

      • USER_NAME

        public static final java.lang.String USER_NAME
        The System property for the User's account name.

      • JAVA_EXT_DIRS

        public static final java.lang.String JAVA_EXT_DIRS
        The System property for the Path of extension directory or directories Deprecated. This property, and the mechanism which implements it, may be removed in a future release..

      • JAVA_VENDOR

        public static final java.lang.String JAVA_VENDOR
        The System property for the Java Runtime Environment vendor.

      • JAVA_SPECIFICATION_VERSION

        public static final java.lang.String JAVA_SPECIFICATION_VERSION
        The System property for the Java Runtime Environment specification version.

      • JAVA_CLASS_VERSION

        public static final java.lang.String JAVA_CLASS_VERSION
        The System property for the Java class format version number.

      • JAVA_SPECIFICATION_NAME

        public static final java.lang.String JAVA_SPECIFICATION_NAME
        The System property for the Java Runtime Environment specification name.

      • JAVA_VENDOR_URL

        public static final java.lang.String JAVA_VENDOR_URL
        The System property for the Java vendor URL.

      • JAVA_VM_VERSION

        public static final java.lang.String JAVA_VM_VERSION
        The System property for the Java Virtual Machine implementation version.

      • OS_NAME

        public static final java.lang.String OS_NAME
        The System property for the Operating system name.

      • OS_ARCH

        public static final java.lang.String OS_ARCH
        The System property for the Operating system architecture.

      • JAVA_HOME

        public static final java.lang.String JAVA_HOME
        The System property for the Java installation directory.

      • OS_VERSION

        public static final java.lang.String OS_VERSION
        The System property for the Operating system version.

      • JAVA_COMPILER

        public static final java.lang.String JAVA_COMPILER
        The System property for the Name of JIT compiler to use.

      • JAVA_VERSION

        public static final java.lang.String JAVA_VERSION
        The System property for the Java Runtime Environment version.

      • JAVA_VM_SPECIFICATION_VERSION

        public static final java.lang.String JAVA_VM_SPECIFICATION_VERSION
        The System property for the Java Virtual Machine specification version.

      • USER_DIR

        public static final java.lang.String USER_DIR
        The System property for the User's current working directory.

      • JAVA_SPECIFICATION_VENDOR

        public static final java.lang.String JAVA_SPECIFICATION_VENDOR
        The System property for the Java Runtime Environment specification vendor.

      • JAVA_VM_SPECIFICATION_NAME

        public static final java.lang.String JAVA_VM_SPECIFICATION_NAME
        The System property for the Java Virtual Machine specification name.

      • JAVA_VM_VENDOR

        public static final java.lang.String JAVA_VM_VENDOR
        The System property for the Java Virtual Machine implementation vendor.

      • JAVA_LIBRARY_PATH

        public static final java.lang.String JAVA_LIBRARY_PATH
        The System property for the List of paths to search when loading libraries.

      • USER_HOME

        public static final java.lang.String USER_HOME
        The System property for the User's home directory.

      • JAVA_VM_NAME

        public static final java.lang.String JAVA_VM_NAME
        The System property for the Java Virtual Machine implementation name.

      • JAVA_VM_SPECIFICATION_VENDOR

        public static final java.lang.String JAVA_VM_SPECIFICATION_VENDOR
        The System property for the Java Virtual Machine specification vendor.

      • JAVA_IO_TMPDIR

        public static final java.lang.String JAVA_IO_TMPDIR
        The System property for the Default temp file path.

      • FILE_ENCODING

        public static final java.lang.String FILE_ENCODING
        The System property for the file encoding, the default is "UTF-8"

      • NATIVE_ENCODING

        public static final java.lang.String NATIVE_ENCODING
        The System property for the native encoding

      • IS_OS_WINDOWS

        public static final boolean IS_OS_WINDOWS

        Is true if this is Windows.

        The field will return false if OS_NAME is null.

      • IS_JAVA_8

        public static final boolean IS_JAVA_8

        Is true if this is Java 8

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_9

        public static final boolean IS_JAVA_9

        Is true if this is Java version 9.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_10

        public static final boolean IS_JAVA_10

        Is true if this is Java version 10.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_11

        public static final boolean IS_JAVA_11

        Is true if this is Java version 11.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_12

        public static final boolean IS_JAVA_12

        Is true if this is Java version 12.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_13

        public static final boolean IS_JAVA_13

        Is true if this is Java version 13.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_14

        public static final boolean IS_JAVA_14

        Is true if this is Java version 14.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_15

        public static final boolean IS_JAVA_15

        Is true if this is Java version 15.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_16

        public static final boolean IS_JAVA_16

        Is true if this is Java version 16.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_17

        public static final boolean IS_JAVA_17

        Is true if this is Java version 17.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_18

        public static final boolean IS_JAVA_18

        Is true if this is Java version 18.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_19

        public static final boolean IS_JAVA_19

        Is true if this is Java version 19.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_20

        public static final boolean IS_JAVA_20

        Is true if this is Java version 20.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_21

        public static final boolean IS_JAVA_21

        Is true if this is Java version 21.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_22

        public static final boolean IS_JAVA_22

        Is true if this is Java version 22.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_23

        public static final boolean IS_JAVA_23

        Is true if this is Java version 23.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_24

        public static final boolean IS_JAVA_24

        Is true if this is Java version 24.x

        The field will return false if JAVA_VERSION is null.

      • IS_LTS_JAVA_VERSION

        public static final boolean IS_LTS_JAVA_VERSION
        Is true if current Java version is Long Term Supported(LTS)

    • Method Detail

      • getSystemProperty

        @Nullable
public static java.lang.String getSystemProperty​(java.lang.String key)

        Gets a system property with the given key, defaulting to null if the property cannot be read.

        If a SecurityException is caught, the return value is null and a message is written to System.err.

        Example Usage

        
 String javaVersion = SystemUtils.getSystemProperty("java.version");
        Parameters:
        key - the name of the system property
        Returns:
        the string value of the system property, or null if the property is not found or access is denied

      • getSystemProperty

        @Nullable
public static java.lang.String getSystemProperty​(java.lang.String key,
                                                 java.lang.String defaultValue)

        Gets a system property with the given key, defaulting to the provided defaultValue if the property cannot be read.

        If a SecurityException is caught while trying to access the system property, the method returns the specified default value and logs a warning message using the logger associated with this class.

        Example Usage

        
 String customProperty = SystemUtils.getSystemProperty("my.custom.property", "default-value");
        Parameters:
        key - the name of the system property
        defaultValue - the default value to return if the property is not found or access is denied
        Returns:
        the string value of the system property, or the provided default value if the property is inaccessible or not found