Apache-commons：lang3.SystemUtils源码

最新推荐文章于 2025-03-11 11:01:58 发布
最新推荐文章于 2025-03-11 11:01:58 发布
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分类专栏： Utils JAVA
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本文链接：https://blog.youkuaiyun.com/qq_26869339/article/details/91400900
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package org.apache.commons.lang3;
//源码
import java.io.File;

public class SystemUtils {
    private static final String OS_NAME_WINDOWS_PREFIX = "Windows";
    private static final String USER_HOME_KEY = "user.home";
    private static final String USER_DIR_KEY = "user.dir";
    private static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir";
    private static final String JAVA_HOME_KEY = "java.home";
    public static final String AWT_TOOLKIT = getSystemProperty("awt.toolkit");
    public static final String FILE_ENCODING = getSystemProperty("file.encoding");
    /** @deprecated */
    @Deprecated
    public static final String FILE_SEPARATOR = getSystemProperty("file.separator");
    public static final String JAVA_AWT_FONTS = getSystemProperty("java.awt.fonts");
    public static final String JAVA_AWT_GRAPHICSENV = getSystemProperty("java.awt.graphicsenv");
    public static final String JAVA_AWT_HEADLESS = getSystemProperty("java.awt.headless");
    public static final String JAVA_AWT_PRINTERJOB = getSystemProperty("java.awt.printerjob");
    public static final String JAVA_CLASS_PATH = getSystemProperty("java.class.path");
    public static final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version");
    public static final String JAVA_COMPILER = getSystemProperty("java.compiler");
    public static final String JAVA_ENDORSED_DIRS = getSystemProperty("java.endorsed.dirs");
    public static final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs");
    public static final String JAVA_HOME = getSystemProperty("java.home");
    public static final String JAVA_IO_TMPDIR = getSystemProperty("java.io.tmpdir");
    public static final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path");
    public static final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name");
    public static final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version");
    public static final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name");
    public static final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor");
    public static final String JAVA_SPECIFICATION_VERSION = getSystemProperty("java.specification.version");
    private static final JavaVersion JAVA_SPECIFICATION_VERSION_AS_ENUM;
    public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY;
    public static final String JAVA_VENDOR;
    public static final String JAVA_VENDOR_URL;
    public static final String JAVA_VERSION;
    public static final String JAVA_VM_INFO;
    public static final String JAVA_VM_NAME;
    public static final String JAVA_VM_SPECIFICATION_NAME;
    public static final String JAVA_VM_SPECIFICATION_VENDOR;
    public static final String JAVA_VM_SPECIFICATION_VERSION;
    public static final String JAVA_VM_VENDOR;
    public static final String JAVA_VM_VERSION;
    /** @deprecated */
    @Deprecated
    public static final String LINE_SEPARATOR;
    public static final String OS_ARCH;
    public static final String OS_NAME;
    public static final String OS_VERSION;
    /** @deprecated */
    @Deprecated
    public static final String PATH_SEPARATOR;
    public static final String USER_COUNTRY;
    public static final String USER_DIR;
    public static final String USER_HOME;
    public static final String USER_LANGUAGE;
    public static final String USER_NAME;
    public static final String USER_TIMEZONE;
    public static final boolean IS_JAVA_1_1;
    public static final boolean IS_JAVA_1_2;
    public static final boolean IS_JAVA_1_3;
    public static final boolean IS_JAVA_1_4;
    public static final boolean IS_JAVA_1_5;
    public static final boolean IS_JAVA_1_6;
    public static final boolean IS_JAVA_1_7;
    public static final boolean IS_JAVA_1_8;
    /** @deprecated */
    @Deprecated
    public static final boolean IS_JAVA_1_9;
    public static final boolean IS_JAVA_9;
    public static final boolean IS_JAVA_10;
    public static final boolean IS_JAVA_11;
    public static final boolean IS_OS_AIX;
    public static final boolean IS_OS_HP_UX;
    public static final boolean IS_OS_400;
    public static final boolean IS_OS_IRIX;
    public static final boolean IS_OS_LINUX;
    public static final boolean IS_OS_MAC;
    public static final boolean IS_OS_MAC_OSX;
    public static final boolean IS_OS_MAC_OSX_CHEETAH;
    public static final boolean IS_OS_MAC_OSX_PUMA;
    public static final boolean IS_OS_MAC_OSX_JAGUAR;
    public static final boolean IS_OS_MAC_OSX_PANTHER;
    public static final boolean IS_OS_MAC_OSX_TIGER;
    public static final boolean IS_OS_MAC_OSX_LEOPARD;
    public static final boolean IS_OS_MAC_OSX_SNOW_LEOPARD;
    public static final boolean IS_OS_MAC_OSX_LION;
    public static final boolean IS_OS_MAC_OSX_MOUNTAIN_LION;
    public static final boolean IS_OS_MAC_OSX_MAVERICKS;
    public static final boolean IS_OS_MAC_OSX_YOSEMITE;
    public static final boolean IS_OS_MAC_OSX_EL_CAPITAN;
    public static final boolean IS_OS_FREE_BSD;
    public static final boolean IS_OS_OPEN_BSD;
    public static final boolean IS_OS_NET_BSD;
    public static final boolean IS_OS_OS2;
    public static final boolean IS_OS_SOLARIS;
    public static final boolean IS_OS_SUN_OS;
    public static final boolean IS_OS_UNIX;
    public static final boolean IS_OS_WINDOWS;
    public static final boolean IS_OS_WINDOWS_2000;
    public static final boolean IS_OS_WINDOWS_2003;
    public static final boolean IS_OS_WINDOWS_2008;
    public static final boolean IS_OS_WINDOWS_2012;
    public static final boolean IS_OS_WINDOWS_95;
    public static final boolean IS_OS_WINDOWS_98;
    public static final boolean IS_OS_WINDOWS_ME;
    public static final boolean IS_OS_WINDOWS_NT;
    public static final boolean IS_OS_WINDOWS_XP;
    public static final boolean IS_OS_WINDOWS_VISTA;
    public static final boolean IS_OS_WINDOWS_7;
    public static final boolean IS_OS_WINDOWS_8;
    public static final boolean IS_OS_WINDOWS_10;
    public static final boolean IS_OS_ZOS;

    public static File getJavaHome() {
        return new File(System.getProperty("java.home"));
    }

    public static String getHostName() {
        return IS_OS_WINDOWS ? System.getenv("COMPUTERNAME") : System.getenv("HOSTNAME");
    }

    public static File getJavaIoTmpDir() {
        return new File(System.getProperty("java.io.tmpdir"));
    }

    private static boolean getJavaVersionMatches(String versionPrefix) {
        return isJavaVersionMatch(JAVA_SPECIFICATION_VERSION, versionPrefix);
    }

    private static boolean getOsMatches(String osNamePrefix, String osVersionPrefix) {
        return isOSMatch(OS_NAME, OS_VERSION, osNamePrefix, osVersionPrefix);
    }

    private static boolean getOsMatchesName(String osNamePrefix) {
        return isOSNameMatch(OS_NAME, osNamePrefix);
    }

    private static String getSystemProperty(String property) {
        try {
            return System.getProperty(property);
        } catch (SecurityException var2) {
            return null;
        }
    }

    public static String getEnvironmentVariable(String name, String defaultValue) {
        try {
            String value = System.getenv(name);
            return value == null ? defaultValue : value;
        } catch (SecurityException var3) {
            return defaultValue;
        }
    }

    public static File getUserDir() {
        return new File(System.getProperty("user.dir"));
    }

    public static File getUserHome() {
        return new File(System.getProperty("user.home"));
    }

    public static boolean isJavaAwtHeadless() {
        return Boolean.TRUE.toString().equals(JAVA_AWT_HEADLESS);
    }

    public static boolean isJavaVersionAtLeast(JavaVersion requiredVersion) {
        return JAVA_SPECIFICATION_VERSION_AS_ENUM.atLeast(requiredVersion);
    }

    static boolean isJavaVersionMatch(String version, String versionPrefix) {
        return version == null ? false : version.startsWith(versionPrefix);
    }

    static boolean isOSMatch(String osName, String osVersion, String osNamePrefix, String osVersionPrefix) {
        if (osName != null && osVersion != null) {
            return isOSNameMatch(osName, osNamePrefix) && isOSVersionMatch(osVersion, osVersionPrefix);
        } else {
            return false;
        }
    }

    static boolean isOSNameMatch(String osName, String osNamePrefix) {
        return osName == null ? false : osName.startsWith(osNamePrefix);
    }

    static boolean isOSVersionMatch(String osVersion, String osVersionPrefix) {
        if (StringUtils.isEmpty(osVersion)) {
            return false;
        } else {
            String[] versionPrefixParts = osVersionPrefix.split("\\.");
            String[] versionParts = osVersion.split("\\.");

            for(int i = 0; i < Math.min(versionPrefixParts.length, versionParts.length); ++i) {
                if (!versionPrefixParts[i].equals(versionParts[i])) {
                    return false;
                }
            }

            return true;
        }
    }

    public SystemUtils() {
    }

    static {
        JAVA_SPECIFICATION_VERSION_AS_ENUM = JavaVersion.get(JAVA_SPECIFICATION_VERSION);
        JAVA_UTIL_PREFS_PREFERENCES_FACTORY = getSystemProperty("java.util.prefs.PreferencesFactory");
        JAVA_VENDOR = getSystemProperty("java.vendor");
        JAVA_VENDOR_URL = getSystemProperty("java.vendor.url");
        JAVA_VERSION = getSystemProperty("java.version");
        JAVA_VM_INFO = getSystemProperty("java.vm.info");
        JAVA_VM_NAME = getSystemProperty("java.vm.name");
        JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name");
        JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor");
        JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version");
        JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor");
        JAVA_VM_VERSION = getSystemProperty("java.vm.version");
        LINE_SEPARATOR = getSystemProperty("line.separator");
        OS_ARCH = getSystemProperty("os.arch");
        OS_NAME = getSystemProperty("os.name");
        OS_VERSION = getSystemProperty("os.version");
        PATH_SEPARATOR = getSystemProperty("path.separator");
        USER_COUNTRY = getSystemProperty("user.country") == null ? getSystemProperty("user.region") : getSystemProperty("user.country");
        USER_DIR = getSystemProperty("user.dir");
        USER_HOME = getSystemProperty("user.home");
        USER_LANGUAGE = getSystemProperty("user.language");
        USER_NAME = getSystemProperty("user.name");
        USER_TIMEZONE = getSystemProperty("user.timezone");
        IS_JAVA_1_1 = getJavaVersionMatches("1.1");
        IS_JAVA_1_2 = getJavaVersionMatches("1.2");
        IS_JAVA_1_3 = getJavaVersionMatches("1.3");
        IS_JAVA_1_4 = getJavaVersionMatches("1.4");
        IS_JAVA_1_5 = getJavaVersionMatches("1.5");
        IS_JAVA_1_6 = getJavaVersionMatches("1.6");
        IS_JAVA_1_7 = getJavaVersionMatches("1.7");
        IS_JAVA_1_8 = getJavaVersionMatches("1.8");
        IS_JAVA_1_9 = getJavaVersionMatches("9");
        IS_JAVA_9 = getJavaVersionMatches("9");
        IS_JAVA_10 = getJavaVersionMatches("10");
        IS_JAVA_11 = getJavaVersionMatches("11");
        IS_OS_AIX = getOsMatchesName("AIX");
        IS_OS_HP_UX = getOsMatchesName("HP-UX");
        IS_OS_400 = getOsMatchesName("OS/400");
        IS_OS_IRIX = getOsMatchesName("Irix");
        IS_OS_LINUX = getOsMatchesName("Linux") || getOsMatchesName("LINUX");
        IS_OS_MAC = getOsMatchesName("Mac");
        IS_OS_MAC_OSX = getOsMatchesName("Mac OS X");
        IS_OS_MAC_OSX_CHEETAH = getOsMatches("Mac OS X", "10.0");
        IS_OS_MAC_OSX_PUMA = getOsMatches("Mac OS X", "10.1");
        IS_OS_MAC_OSX_JAGUAR = getOsMatches("Mac OS X", "10.2");
        IS_OS_MAC_OSX_PANTHER = getOsMatches("Mac OS X", "10.3");
        IS_OS_MAC_OSX_TIGER = getOsMatches("Mac OS X", "10.4");
        IS_OS_MAC_OSX_LEOPARD = getOsMatches("Mac OS X", "10.5");
        IS_OS_MAC_OSX_SNOW_LEOPARD = getOsMatches("Mac OS X", "10.6");
        IS_OS_MAC_OSX_LION = getOsMatches("Mac OS X", "10.7");
        IS_OS_MAC_OSX_MOUNTAIN_LION = getOsMatches("Mac OS X", "10.8");
        IS_OS_MAC_OSX_MAVERICKS = getOsMatches("Mac OS X", "10.9");
        IS_OS_MAC_OSX_YOSEMITE = getOsMatches("Mac OS X", "10.10");
        IS_OS_MAC_OSX_EL_CAPITAN = getOsMatches("Mac OS X", "10.11");
        IS_OS_FREE_BSD = getOsMatchesName("FreeBSD");
        IS_OS_OPEN_BSD = getOsMatchesName("OpenBSD");
        IS_OS_NET_BSD = getOsMatchesName("NetBSD");
        IS_OS_OS2 = getOsMatchesName("OS/2");
        IS_OS_SOLARIS = getOsMatchesName("Solaris");
        IS_OS_SUN_OS = getOsMatchesName("SunOS");
        IS_OS_UNIX = IS_OS_AIX || IS_OS_HP_UX || IS_OS_IRIX || IS_OS_LINUX || IS_OS_MAC_OSX || IS_OS_SOLARIS || IS_OS_SUN_OS || IS_OS_FREE_BSD || IS_OS_OPEN_BSD || IS_OS_NET_BSD;
        IS_OS_WINDOWS = getOsMatchesName("Windows");
        IS_OS_WINDOWS_2000 = getOsMatchesName("Windows 2000");
        IS_OS_WINDOWS_2003 = getOsMatchesName("Windows 2003");
        IS_OS_WINDOWS_2008 = getOsMatchesName("Windows Server 2008");
        IS_OS_WINDOWS_2012 = getOsMatchesName("Windows Server 2012");
        IS_OS_WINDOWS_95 = getOsMatchesName("Windows 95");
        IS_OS_WINDOWS_98 = getOsMatchesName("Windows 98");
        IS_OS_WINDOWS_ME = getOsMatchesName("Windows Me");
        IS_OS_WINDOWS_NT = getOsMatchesName("Windows NT");
        IS_OS_WINDOWS_XP = getOsMatchesName("Windows XP");
        IS_OS_WINDOWS_VISTA = getOsMatchesName("Windows Vista");
        IS_OS_WINDOWS_7 = getOsMatchesName("Windows 7");
        IS_OS_WINDOWS_8 = getOsMatchesName("Windows 8");
        IS_OS_WINDOWS_10 = getOsMatchesName("Windows 10");
        IS_OS_ZOS = getOsMatchesName("z/OS");
    }
}
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