Java tutorial
/* * Copyright (c) 2015 Power Group. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * * http://www.apache.org/licenses/LICENSE-2.0 * * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ package org.power.commons.lang.util; import org.apache.commons.lang3.StringEscapeUtils; import java.io.PrintWriter; import java.net.InetAddress; import java.net.UnknownHostException; import java.nio.charset.Charset; import java.util.Locale; /** * ClassName: org.power.commons.lang.util <br> * //TODO insert into titile here * * @author Kuo Hong * @version 2015-09-03 */ public class SystemUtils { private static final JvmSpecInfo JVM_SPEC_INFO = new JvmSpecInfo(); private static final JvmInfo JVM_INFO = new JvmInfo(); private static final JavaSpecInfo JAVA_SPEC_INFO = new JavaSpecInfo(); private static final JavaInfo JAVA_INFO = new JavaInfo(); private static final OsInfo OS_INFO = new OsInfo(); private static final UserInfo USER_INFO = new UserInfo(); private static final HostInfo HOST_INFO = new HostInfo(); private static final JavaRuntimeInfo JAVA_RUNTIME_INFO = new JavaRuntimeInfo(); /** * ?Java Virtual Machine Specification? * * @return <code>JvmSpecInfo</code> */ public static final JvmSpecInfo getJvmSpecInfo() { return JVM_SPEC_INFO; } /** * ?Java Virtual Machine Implementation? * * @return <code>JvmInfo</code> */ public static final JvmInfo getJvmInfo() { return JVM_INFO; } /** * ?Java Specification? * * @return <code>JavaSpecInfo</code> */ public static final JavaSpecInfo getJavaSpecInfo() { return JAVA_SPEC_INFO; } /** * ?Java Implementation? * * @return <code>JavaInfo</code> */ public static final JavaInfo getJavaInfo() { return JAVA_INFO; } /** * ???JRE? * * @return <code>JreInfo</code> */ public static final JavaRuntimeInfo getJavaRuntimeInfo() { return JAVA_RUNTIME_INFO; } /** * ?OS? * * @return <code>OsInfo</code> */ public static final OsInfo getOsInfo() { return OS_INFO; } /** * ?User? * * @return <code>UserInfo</code> */ public static final UserInfo getUserInfo() { return USER_INFO; } /** * ?Host? * * @return <code>HostInfo</code> */ public static final HostInfo getHostInfo() { return HOST_INFO; } /** Java Virutal Machine Specification? */ public static final class JvmSpecInfo { private final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name", false); private final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version", false); private final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor", false); /** */ private JvmSpecInfo() { } /** * ??JVM spec.???<code>java.vm.specification.name</code> * <p> * Sun JDK 1.4.2<code>"Java Virtual Machine Specification"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getName() { return JAVA_VM_SPECIFICATION_NAME; } /** * ??JVM spec.?<code>java.vm.specification.version</code> * <p> * Sun JDK 1.4.2<code>"1.0"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getVersion() { return JAVA_VM_SPECIFICATION_VERSION; } /** * ??JVM spec.?<code>java.vm.specification.vendor</code> * <p> * Sun JDK 1.4.2<code>"Sun Microsystems Inc."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getVendor() { return JAVA_VM_SPECIFICATION_VENDOR; } /** * Java Virutal Machine Specification??? * * @return JVM spec. */ public final String toString() { StringBuilder buffer = new StringBuilder(); append(buffer, "JavaVM Spec. Name: ", getName()); append(buffer, "JavaVM Spec. Version: ", getVersion()); append(buffer, "JavaVM Spec. Vendor: ", getVendor()); return buffer.toString(); } } /** Java Virtual Machine Implementation? */ public static final class JvmInfo { private final String JAVA_VM_NAME = getSystemProperty("java.vm.name", false); private final String JAVA_VM_VERSION = getSystemProperty("java.vm.version", false); private final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor", false); private final String JAVA_VM_INFO = getSystemProperty("java.vm.info", false); /** */ private JvmInfo() { } /** * ??JVM impl.???<code>java.vm.name</code> * <p> * Sun JDK 1.4.2<code>"Java HotSpot(TM) Client VM"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getName() { return JAVA_VM_NAME; } /** * ??JVM impl.?<code>java.vm.version</code> * <p> * Sun JDK 1.4.2<code>"1.4.2-b28"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getVersion() { return JAVA_VM_VERSION; } /** * ??JVM impl.?<code>java.vm.vendor</code> * <p> * Sun JDK 1.4.2<code>"Sun Microsystems Inc."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getVendor() { return JAVA_VM_VENDOR; } /** * ??JVM impl.??<code>java.vm.info</code> * <p> * Sun JDK 1.4.2<code>"mixed mode"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getInfo() { return JAVA_VM_INFO; } /** * Java Virutal Machine Implementation??? * * @return JVM impl. */ public final String toString() { StringBuilder buffer = new StringBuilder(); append(buffer, "JavaVM Name: ", getName()); append(buffer, "JavaVM Version: ", getVersion()); append(buffer, "JavaVM Vendor: ", getVendor()); append(buffer, "JavaVM Info: ", getInfo()); return buffer.toString(); } } /** Java Specification? */ public static final class JavaSpecInfo { private final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name", false); private final String JAVA_SPECIFICATION_VERSION = getSystemProperty("java.specification.version", false); private final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor", false); /** */ private JavaSpecInfo() { } /** * ??Java Spec.???<code>java.specification.name</code> * <p> * Sun JDK 1.4.2<code>"Java Platform API Specification"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getName() { return JAVA_SPECIFICATION_NAME; } /** * ??Java Spec.?<code>java.specification.version</code> * <p> * Sun JDK 1.4.2<code>"1.4"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.3 */ public final String getVersion() { return JAVA_SPECIFICATION_VERSION; } /** * ??Java Spec.?<code>java.specification.vendor</code> * <p> * Sun JDK 1.4.2<code>"Sun Microsystems Inc."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getVendor() { return JAVA_SPECIFICATION_VENDOR; } /** * Java Specification??? * * @return JVM spec. */ public final String toString() { StringBuilder buffer = new StringBuilder(); append(buffer, "Java Spec. Name: ", getName()); append(buffer, "Java Spec. Version: ", getVersion()); append(buffer, "Java Spec. Vendor: ", getVendor()); return buffer.toString(); } } /** Java Implementation? */ public static final class JavaInfo { private final String JAVA_VERSION = getSystemProperty("java.version", false); private final float JAVA_VERSION_FLOAT = getJavaVersionAsFloat(); private final int JAVA_VERSION_INT = getJavaVersionAsInt(); private final String JAVA_VENDOR = getSystemProperty("java.vendor", false); private final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url", false); private final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1"); private final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2"); private final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3"); private final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4"); private final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5"); /** */ private JavaInfo() { } /** * ??Java impl.?<code>java.version</code> * <p> * Sun JDK 1.4.2<code>"1.4.2"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getVersion() { return JAVA_VERSION; } /** * ??Java impl.?<code>java.version</code> * <p> * * <ul> * <li>JDK 1.2<code>1.2f</code></li> * <li>JDK 1.3.1<code>1.31f</code></li> * </ul> * </p> * * @return ??Java??<code>0</code> * @since Java 1.1 */ public final float getVersionFloat() { return JAVA_VERSION_FLOAT; } /** * ??Java impl.?<code>java.version</code> * <p> * * <ul> * <li>JDK 1.2<code>120</code></li> * <li>JDK 1.3.1<code>131</code></li> * </ul> * </p> * * @return ??Java??<code>0</code> * @since Java 1.1 */ public final int getVersionInt() { return JAVA_VERSION_INT; } /** * ??Java impl.<code>float</code> * * @return Java<code>float</code><code>0</code> */ private final float getJavaVersionAsFloat() { if (JAVA_VERSION == null) { return 0f; } String str = JAVA_VERSION.substring(0, 3); if (JAVA_VERSION.length() >= 5) { str = str + JAVA_VERSION.substring(4, 5); } return Float.parseFloat(str); } /** * ??Java impl.<code>int</code> * * @return Java<code>int</code><code>0</code> */ private final int getJavaVersionAsInt() { if (JAVA_VERSION == null) { return 0; } String str = JAVA_VERSION.substring(0, 1); str = str + JAVA_VERSION.substring(2, 3); if (JAVA_VERSION.length() >= 5) { str = str + JAVA_VERSION.substring(4, 5); } else { str = str + "0"; } return Integer.parseInt(str); } /** * ??Java impl.?<code>java.vendor</code> * <p> * Sun JDK 1.4.2<code>"Sun Microsystems Inc."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getVendor() { return JAVA_VENDOR; } /** * ??Java impl.URL?<code>java.vendor.url</code> * <p> * Sun JDK 1.4.2<code>"http://java.sun.com/"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getVendorURL() { return JAVA_VENDOR_URL; } /** * ?Java * <p> * ??<code>java.version</code>Java? * <code>false</code> * </p> * * @return ?Java1.1<code>true</code> */ public final boolean isJava11() { return IS_JAVA_1_1; } /** * ?Java * <p> * ??<code>java.version</code>Java? * <code>false</code> * </p> * * @return ?Java1.2<code>true</code> */ public final boolean isJava12() { return IS_JAVA_1_2; } /** * ?Java * <p> * ??<code>java.version</code>Java? * <code>false</code> * </p> * * @return ?Java1.3<code>true</code> */ public final boolean isJava13() { return IS_JAVA_1_3; } /** * ?Java * <p> * ??<code>java.version</code>Java? * <code>false</code> * </p> * * @return ?Java1.4<code>true</code> */ public final boolean isJava14() { return IS_JAVA_1_4; } /** * ?Java * <p> * ??<code>java.version</code>Java? * <code>false</code> * </p> * * @return ?Java1.5<code>true</code> */ public final boolean isJava15() { return IS_JAVA_1_5; } /** * ??Java * * @param versionPrefix Java? * @return ?<code>true</code> */ private final boolean getJavaVersionMatches(String versionPrefix) { if (JAVA_VERSION == null) { return false; } return JAVA_VERSION.startsWith(versionPrefix); } /** * ?Java?? * <p> * * </p> * <ul> * <li>JDK 1.2<code>isJavaVersionAtLeast(1.2f)</code></li> * <li>JDK 1.2.1<code>isJavaVersionAtLeast(1.31f)</code></li> * </ul> * * @param requiredVersion ? * @return ?Java<code>true</code> */ public final boolean isJavaVersionAtLeast(float requiredVersion) { return getVersionFloat() >= requiredVersion; } /** * ?Java?? * <p> * * </p> * <ul> * <li>JDK 1.2<code>isJavaVersionAtLeast(120)</code></li> * <li>JDK 1.2.1<code>isJavaVersionAtLeast(131)</code></li> * </ul> * * @param requiredVersion ? * @return ?Java<code>true</code> */ public final boolean isJavaVersionAtLeast(int requiredVersion) { return getVersionInt() >= requiredVersion; } /** * Java Implementation??? * * @return JVM impl. */ public final String toString() { StringBuilder buffer = new StringBuilder(); append(buffer, "Java Version: ", getVersion()); append(buffer, "Java Vendor: ", getVendor()); append(buffer, "Java Vendor URL: ", getVendorURL()); return buffer.toString(); } } /** ??JRE? */ public static final class JavaRuntimeInfo { private final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name", false); private final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version", false); private final String JAVA_HOME = getSystemProperty("java.home", false); private final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs", false); private final String JAVA_ENDORSED_DIRS = getSystemProperty("java.endorsed.dirs", false); private final String JAVA_CLASS_PATH = getSystemProperty("java.class.path", false); private final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version", false); private final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path", false); /** */ private JavaRuntimeInfo() { } /** * ??JRE???<code>java.runtime.name</code> * <p> * Sun JDK 1.4.2 * <code>"Java(TM) 2 Runtime Environment, Standard Edition"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.3 */ public final String getName() { return JAVA_RUNTIME_NAME; } /** * ??JRE?<code>java.runtime.version</code> * <p> * Sun JDK 1.4.2<code>"1.4.2-b28"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.3 */ public final String getVersion() { return JAVA_RUNTIME_VERSION; } /** * ??JRE?<code>java.home</code> * <p> * Sun JDK 1.4.2<code>"/opt/jdk1.4.2/jre"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getHomeDir() { return JAVA_HOME; } /** * ??JRE?<code>java.ext.dirs</code> * <p> * Sun JDK 1.4.2<code>"/opt/jdk1.4.2/jre/lib/ext:..."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.3 */ public final String getExtDirs() { return JAVA_EXT_DIRS; } /** * ??JREendorsed?<code>java.endorsed.dirs</code> * <p> * Sun JDK 1.4.2<code>"/opt/jdk1.4.2/jre/lib/endorsed:..."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.4 */ public final String getEndorsedDirs() { return JAVA_ENDORSED_DIRS; } /** * ??JREclasspath?<code>java.class.path</code> * <p> * <code>"/home/admin/myclasses:/home/admin/..."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getClassPath() { return JAVA_CLASS_PATH; } /** * ??JREclasspath?<code>java.class.path</code> * <p> * <code>"/home/admin/myclasses:/home/admin/..."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String[] getClassPathArray() { return StringUtils.split(getClassPath(), getOsInfo().getPathSeparator()); } /** * ??JREclass??<code>java.class.version</code> * <p> * Sun JDK 1.4.2<code>"48.0"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getClassVersion() { return JAVA_CLASS_VERSION; } /** * ??JRElibrary??<code>java.library.path</code> * <p> * Sun JDK 1.4.2<code>"/opt/jdk1.4.2/bin:..."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getLibraryPath() { return JAVA_LIBRARY_PATH; } /** * ??JRElibrary??<code>java.library.path</code> * <p> * Sun JDK 1.4.2<code>"/opt/jdk1.4.2/bin:..."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String[] getLibraryPathArray() { return StringUtils.split(getLibraryPath(), getOsInfo().getPathSeparator()); } /** * ??JREURL??packages?<code>java.library.path</code> * <p> * Sun JDK 1.4.2<code>"sun.net.www.protocol|..."</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getProtocolPackages() { return getSystemProperty("java.protocol.handler.pkgs", true); } /** * ??JRE??? * * @return JRE? */ public final String toString() { StringBuilder buffer = new StringBuilder(); append(buffer, "Java Runtime Name: ", getName()); append(buffer, "Java Runtime Version: ", getVersion()); append(buffer, "Java Home Dir: ", getHomeDir()); append(buffer, "Java Extension Dirs: ", getExtDirs()); append(buffer, "Java Endorsed Dirs: ", getEndorsedDirs()); append(buffer, "Java Class Path: ", getClassPath()); append(buffer, "Java Class Version: ", getClassVersion()); append(buffer, "Java Library Path: ", getLibraryPath()); append(buffer, "Java Protocol Packages: ", getProtocolPackages()); return buffer.toString(); } } /** ?OS? */ public static final class OsInfo { private final String OS_VERSION = getSystemProperty("os.version", false); private final String OS_ARCH = getSystemProperty("os.arch", false); private final String OS_NAME = getSystemProperty("os.name", false); private final boolean IS_OS_AIX = getOSMatches("AIX"); private final boolean IS_OS_HP_UX = getOSMatches("HP-UX"); private final boolean IS_OS_IRIX = getOSMatches("Irix"); private final boolean IS_OS_LINUX = getOSMatches("Linux") || getOSMatches("LINUX"); private final boolean IS_OS_MAC = getOSMatches("Mac"); private final boolean IS_OS_MAC_OSX = getOSMatches("Mac OS X"); private final boolean IS_OS_OS2 = getOSMatches("OS/2"); private final boolean IS_OS_SOLARIS = getOSMatches("Solaris"); private final boolean IS_OS_SUN_OS = getOSMatches("SunOS"); private final boolean IS_OS_WINDOWS = getOSMatches("Windows"); private final boolean IS_OS_WINDOWS_2000 = getOSMatches("Windows", "5.0"); private final boolean IS_OS_WINDOWS_95 = getOSMatches("Windows 9", "4.0"); private final boolean IS_OS_WINDOWS_98 = getOSMatches("Windows 9", "4.1"); private final boolean IS_OS_WINDOWS_ME = getOSMatches("Windows", "4.9"); private final boolean IS_OS_WINDOWS_NT = getOSMatches("Windows NT"); private final boolean IS_OS_WINDOWS_XP = getOSMatches("Windows", "5.1"); // ?file.encoding?????LocaleUtil?? private final String FILE_ENCODING = Charset.defaultCharset().name(); private final String FILE_SEPARATOR = getSystemProperty("file.separator", false); private final String LINE_SEPARATOR = getSystemProperty("line.separator", false); private final String PATH_SEPARATOR = getSystemProperty("path.separator", false); /** */ private OsInfo() { } /** * ??OS?<code>os.arch</code> * <p> * <code>"x86"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getArch() { return OS_ARCH; } /** * ??OS???<code>os.name</code> * <p> * <code>"Windows XP"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getName() { return OS_NAME; } /** * ??OS?<code>os.version</code> * <p> * <code>"5.1"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getVersion() { return OS_VERSION; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSAIX<code>true</code> */ public final boolean isAix() { return IS_OS_AIX; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSHP-UX<code>true</code> */ public final boolean isHpUx() { return IS_OS_HP_UX; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSIRIX<code>true</code> */ public final boolean isIrix() { return IS_OS_IRIX; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSLinux<code>true</code> */ public final boolean isLinux() { return IS_OS_LINUX; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSMac<code>true</code> */ public final boolean isMac() { return IS_OS_MAC; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSMacOS X<code>true</code> */ public final boolean isMacOsX() { return IS_OS_MAC_OSX; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSOS2<code>true</code> */ public final boolean isOs2() { return IS_OS_OS2; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSSolaris<code>true</code> */ public final boolean isSolaris() { return IS_OS_SOLARIS; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSSun OS<code>true</code> */ public final boolean isSunOS() { return IS_OS_SUN_OS; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSWindows<code>true</code> */ public final boolean isWindows() { return IS_OS_WINDOWS; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSWindows 2000<code>true</code> */ public final boolean isWindows2000() { return IS_OS_WINDOWS_2000; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSWindows 95<code>true</code> */ public final boolean isWindows95() { return IS_OS_WINDOWS_95; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSWindows 98<code>true</code> */ public final boolean isWindows98() { return IS_OS_WINDOWS_98; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSWindows ME<code>true</code> */ public final boolean isWindowsME() { return IS_OS_WINDOWS_ME; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSWindows NT<code>true</code> */ public final boolean isWindowsNT() { return IS_OS_WINDOWS_NT; } /** * ?OS * <p> * ??<code>os.name</code>Java?<code>false</code> * </p> * * @return ?OSWindows XP<code>true</code> */ public final boolean isWindowsXP() { return IS_OS_WINDOWS_XP; } /** * ?OS?? * * @param osNamePrefix OS??? * @return ?<code>true</code> */ private final boolean getOSMatches(String osNamePrefix) { if (OS_NAME == null) { return false; } return OS_NAME.startsWith(osNamePrefix); } /** * ?OS?? * * @param osNamePrefix OS??? * @param osVersionPrefix OS? * @return ?<code>true</code> */ private final boolean getOSMatches(String osNamePrefix, String osVersionPrefix) { if (OS_NAME == null || OS_VERSION == null) { return false; } return OS_NAME.startsWith(osNamePrefix) && OS_VERSION.startsWith(osVersionPrefix); } /** * ?OS??<code>file.encoding</code> * <p> * ??JVM?/? <code>GBK</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getFileEncoding() { return FILE_ENCODING; } /** * ?OS?<code>file.separator</code> * <p> * Unix<code>"/"</code>Windows<code>"\\"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getFileSeparator() { return FILE_SEPARATOR; } /** * ?OS??<code>line.separator</code> * <p> * Unix<code>"\n"</code>Windows<code>"\r\n"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getLineSeparator() { return LINE_SEPARATOR; } /** * ?OS??<code>path.separator</code> * <p> * Unix<code>":"</code>Windows<code>";"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getPathSeparator() { return PATH_SEPARATOR; } /** * OS??? * * @return OS */ public final String toString() { StringBuilder buffer = new StringBuilder(); append(buffer, "OS Arch: ", getArch()); append(buffer, "OS Name: ", getName()); append(buffer, "OS Version: ", getVersion()); append(buffer, "File Encoding: ", getFileEncoding()); append(buffer, "File Separator: ", getFileSeparator()); append(buffer, "Line Separator: ", getLineSeparator()); append(buffer, "Path Separator: ", getPathSeparator()); return buffer.toString(); } } /** ?? */ public static final class UserInfo { private final String USER_NAME = getSystemProperty("user.name", false); private final String USER_HOME = getSystemProperty("user.home", false); private final String USER_DIR = getSystemProperty("user.dir", false); private final String USER_LANGUAGE = getSystemProperty("user.language", false); private final String USER_COUNTRY = getSystemProperty("user.country", false) == null ? getSystemProperty("user.region", false) : getSystemProperty("user.country", false); private final String JAVA_IO_TMPDIR = getSystemProperty("java.io.tmpdir", false); /** */ private UserInfo() { } /** * ?????<code>user.name</code> * <p> * <code>"admin"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getName() { return USER_NAME; } /** * ??home?<code>user.home</code> * <p> * <code>"/home/admin"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getHomeDir() { return USER_HOME; } /** * ???<code>user.dir</code> * <p> * <code>"/home/admin/working"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.1 */ public final String getCurrentDir() { return USER_DIR; } /** * ??<code>java.io.tmpdir</code> * <p> * <code>"/tmp"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getTempDir() { return JAVA_IO_TMPDIR; } /** * ???<code>user.language</code> * <p> * <code>"zh"</code>?<code>"en"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getLanguage() { return USER_LANGUAGE; } /** * ???JDK1.4 <code>user.country</code>JDK1.2 * <code>user.region</code> * <p> * <code>"CN"</code>?<code>"US"</code> * </p> * * @return ??Java??<code>null</code> * @since Java 1.2 */ public final String getCountry() { return USER_COUNTRY; } /** * ???? * * @return ? */ public final String toString() { StringBuilder buffer = new StringBuilder(); append(buffer, "User Name: ", getName()); append(buffer, "User Home Dir: ", getHomeDir()); append(buffer, "User Current Dir: ", getCurrentDir()); append(buffer, "User Temp Dir: ", getTempDir()); append(buffer, "User Language: ", getLanguage()); append(buffer, "User Country: ", getCountry()); return buffer.toString(); } } /** ?? */ public static final class HostInfo { private final String HOST_NAME; private final String HOST_ADDRESS; /** */ private HostInfo() { String hostName; String hostAddress; try { InetAddress localhost = InetAddress.getLocalHost(); hostName = localhost.getHostName(); hostAddress = localhost.getHostAddress(); } catch (UnknownHostException e) { hostName = "localhost"; hostAddress = "127.0.0.1"; } HOST_NAME = hostName; HOST_ADDRESS = hostAddress; } /** * ???? * <p> * <code>"webserver1"</code> * </p> * * @return ?? */ public final String getName() { return HOST_NAME; } /** * ??? * <p> * <code>"192.168.0.1"</code> * </p> * * @return ? */ public final String getAddress() { return HOST_ADDRESS; } /** * ???? * * @return ? */ public final String toString() { StringBuilder buffer = new StringBuilder(); append(buffer, "Host Name: ", getName()); append(buffer, "Host Address: ", getAddress()); return buffer.toString(); } } /** ?<code>PrintWriter</code> */ public static final void dumpSystemInfo() { dumpSystemInfo(new PrintWriter(System.out)); } /** * ?<code>PrintWriter</code> * * @param out <code>PrintWriter</code>? */ public static final void dumpSystemInfo(PrintWriter out) { out.println("--------------"); out.println(getJvmSpecInfo()); out.println("--------------"); out.println(getJvmInfo()); out.println("--------------"); out.println(getJavaSpecInfo()); out.println("--------------"); out.println(getJavaInfo()); out.println("--------------"); out.println(getJavaRuntimeInfo()); out.println("--------------"); out.println(getOsInfo()); out.println("--------------"); out.println(getUserInfo()); out.println("--------------"); out.println(getHostInfo()); out.println("--------------"); out.flush(); } /** * ?Java?<code>System.err</code>? * <code>null</code> * * @param name ?? * @param quiet ????<code>System.err</code> * @return <code>null</code> */ private static String getSystemProperty(String name, boolean quiet) { try { return System.getProperty(name); } catch (SecurityException e) { if (!quiet) { System.err.println("Caught a SecurityException reading the system property '" + name + "'; the SystemUtil property value will default to null."); } return null; } } /** * <code>StringBuilder</code> * * @param buffer <code>StringBuilder</code> * @param caption * @param value */ private static void append(StringBuilder buffer, String caption, String value) { buffer.append(caption).append( org.apache.commons.lang3.StringUtils.defaultString(StringEscapeUtils.escapeJava(value), "[n/a]")) .append("\n"); } }