Java的System.getProperty详解

package javax.org.lang; / * @Date: 2013-6-18 * @Author: jilongliang * @Description：System.getProperty详解 */ @SuppressWarnings("all") public class SysProperty { public static void main(String[] args) { System.out.println(compiler()); } /获取操作系统名称*/ private static String osName() { return System.getProperty("os.name"); } /获取操作系统版本*/ private static String osVersion() { return System.getProperty("os.version"); } /获取Java运行时环境供应商*/ private static String vendor() { return System.getProperty("java.vendor"); } /获取Java供应商的 URL*/ private static String vendorUrl() { return System.getProperty("java.vendor.url"); } /Java 安装目录*/ private static String home() { return System.getProperty("java.home"); } /获取类的版本*/ private static String classVersion() { return System.getProperty("java.class.version"); } / * Java 类路径 * @return */ private static String classPath() { return System.getProperty("java.class.path"); } / * 操作系统的架构 * @return */ private static String osArch() { return System.getProperty("os.arch"); } / * 获取用户的账户名称 * @return */ private static String userName() { return System.getProperty("user.name"); } / * 获取用户的主目录 * @return */ private static String userHome() { return System.getProperty("user.home"); } / * 用户的当前工作目录 * @return */ private static String userDir() { return System.getProperty("user.dir"); } / * Java 虚拟机规范版本 * @return */ private static String vmSpecificationVersion() { return System.getProperty("java.vm.specification.version"); } / * Java 虚拟机规范供应商 * @return */ private static String vmSpecificationVendor() { return System.getProperty("java.vm.specification.vendor"); } / * Java 虚拟机规范名称 * @return */ private static String vmSpecificationName() { return System.getProperty("java.vm.specification.name"); } / * Java 虚拟机实现版本 * @return */ private static String vmVersion() { return System.getProperty("java.vm.version"); } / * Java 虚拟机实现供应商 * @return */ private static String vmVendor() { return System.getProperty("java.vm.vendor"); } / * Java 虚拟机实现名称 * @return */ private static String vmName() { return System.getProperty("java.vm.name"); } / * 一个或多个扩展目录的路径 * @return */ private static String extDirs() { return System.getProperty("java.ext.dirs"); } / *加载库时搜索的路径列表 * @return */ private static String library() { return System.getProperty("java.library.path"); } / * 文件分隔符（在 UNIX 系统中是“/”） * @return */ private static String fileSeparator() { return System.getProperty("file.separator"); } / * 路径分隔符（在 UNIX 系统中是“:”） * @return */ private static String pathSeparator() { return System.getProperty("path.separator"); } / * 行分隔符（在 UNIX 系统中是“/n”） * @return */ private static String lineSeparator() { return System.getProperty("line.separator"); } / * 要使用的 JIT 编译器的名称 * @return */ private static String compiler() { return System.getProperty("java.compiler"); } / * C:\Users\ADMINI~1\AppData\Local\Temp\ 获取当前临时目录 * * @return */ public static String getSystempPath() { return System.getProperty("java.io.tmpdir"); } / * 以\分割 * * @return */ public static String getSeparator() { return System.getProperty("file.separator"); } / * 如:file:/D:/Workspaces/MyEclipse%208.6/myapp/WebRoot/WEB-INF/classes/未处理 * 处理后：D:\Workspaces\MyEclipse%208.6\napp\WebRoot\ 获取当前项目的路径 * * @return */ public static String getSysPath() { String path = Thread.currentThread().getContextClassLoader() .getResource("").toString(); System.out.println(path); String temp = path.replaceFirst("file:/", "").replaceFirst("WEB-INF/classes/", ""); String separator = System.getProperty("file.separator"); String resultPath = temp.replaceAll("/", separator + separator); return resultPath; } / * 未处理 D:/Workspaces/MyEclipse%208.6/myapp/WebRoot/WEB-INF/classes/ 已处理 * D:\Workspaces\MyEclipse%208.6\myapp\WebRoot\WEB-INF\classes\ * * @return */ public static String getClassPath() { String path = Thread.currentThread().getContextClassLoader().getResource("").toString(); String temp = path.replaceFirst("file:/", ""); String separator = System.getProperty("file.separator"); String resultPath = temp.replaceAll("/", separator + separator); return resultPath; } } 

package com.org; 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"); 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"); public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY = getSystemProperty("java.util.prefs.PreferencesFactory"); public static final String JAVA_VENDOR = getSystemProperty("java.vendor"); public static final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url"); public static final String JAVA_VERSION = getSystemProperty("java.version"); public static final String JAVA_VM_INFO = getSystemProperty("java.vm.info"); public static final String JAVA_VM_NAME = getSystemProperty("java.vm.name"); public static final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name"); public static final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor"); public static final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version"); public static final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor"); public static final String JAVA_VM_VERSION = getSystemProperty("java.vm.version"); public static final String LINE_SEPARATOR = getSystemProperty("line.separator"); public static final String OS_ARCH = getSystemProperty("os.arch"); public static final String OS_NAME = getSystemProperty("os.name"); public static final String OS_VERSION = getSystemProperty("os.version"); public static final String PATH_SEPARATOR = getSystemProperty("path.separator"); public static final String USER_COUNTRY = getSystemProperty("user.country") == null ? getSystemProperty("user.region") : getSystemProperty("user.country"); public static final String USER_DIR = getSystemProperty("user.dir"); public static final String USER_HOME = getSystemProperty("user.home"); public static final String USER_LANGUAGE = getSystemProperty("user.language"); public static final String USER_NAME = getSystemProperty("user.name"); public static final String USER_TIMEZONE = getSystemProperty("user.timezone"); public static final String JAVA_VERSION_TRIMMED = getJavaVersionTrimmed(); public static final float JAVA_VERSION_FLOAT = getJavaVersionAsFloat(); public static final int JAVA_VERSION_INT = getJavaVersionAsInt(); public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1"); public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2"); public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3"); public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4"); public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5"); public static final boolean IS_JAVA_1_6 = getJavaVersionMatches("1.6"); public static final boolean IS_OS_AIX = getOSMatches("AIX"); public static final boolean IS_OS_HP_UX = getOSMatches("HP-UX"); public static final boolean IS_OS_IRIX = getOSMatches("Irix"); public static final boolean IS_OS_LINUX = (getOSMatches("Linux")) || (getOSMatches("LINUX")); public static final boolean IS_OS_MAC = getOSMatches("Mac"); public static final boolean IS_OS_MAC_OSX = getOSMatches("Mac OS X"); public static final boolean IS_OS_OS2 = getOSMatches("OS/2"); public static final boolean IS_OS_SOLARIS = getOSMatches("Solaris"); public static final boolean IS_OS_SUN_OS = getOSMatches("SunOS"); public static final boolean 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); public static final boolean IS_OS_WINDOWS = getOSMatches("Windows"); public static final boolean IS_OS_WINDOWS_2000 = getOSMatches("Windows", "5.0"); public static final boolean IS_OS_WINDOWS_95 = getOSMatches("Windows 9", "4.0"); public static final boolean IS_OS_WINDOWS_98 = getOSMatches("Windows 9", "4.1"); public static final boolean IS_OS_WINDOWS_ME = getOSMatches("Windows", "4.9"); public static final boolean IS_OS_WINDOWS_NT = getOSMatches("Windows NT"); public static final boolean IS_OS_WINDOWS_XP = getOSMatches("Windows", "5.1"); / @deprecated */ public static float getJavaVersion() { return JAVA_VERSION_FLOAT; } private static float getJavaVersionAsFloat() { if (JAVA_VERSION_TRIMMED == null) { return 0.0F; } String str = JAVA_VERSION_TRIMMED.substring(0, 3); if (JAVA_VERSION_TRIMMED.length() >= 5) str = str + JAVA_VERSION_TRIMMED.substring(4, 5); try { return Float.parseFloat(str); } catch (Exception ex) { } return 0.0F; } private static int getJavaVersionAsInt() { if (JAVA_VERSION_TRIMMED == null) { return 0; } String str = JAVA_VERSION_TRIMMED.substring(0, 1); str = str + JAVA_VERSION_TRIMMED.substring(2, 3); if (JAVA_VERSION_TRIMMED.length() >= 5) str = str + JAVA_VERSION_TRIMMED.substring(4, 5); else str = str + "0"; try { return Integer.parseInt(str); } catch (Exception ex) { } return 0; } private static String getJavaVersionTrimmed() { if (JAVA_VERSION != null) { for (int i = 0; i < JAVA_VERSION.length(); i++) { char ch = JAVA_VERSION.charAt(i); if ((ch >= '0') && (ch <= '9')) { return JAVA_VERSION.substring(i); } } } return null; } private static boolean getJavaVersionMatches(String versionPrefix) { if (JAVA_VERSION_TRIMMED == null) { return false; } return JAVA_VERSION_TRIMMED.startsWith(versionPrefix); } private static boolean getOSMatches(String osNamePrefix) { if (OS_NAME == null) { return false; } return OS_NAME.startsWith(osNamePrefix); } private static boolean getOSMatches(String osNamePrefix, String osVersionPrefix) { if ((OS_NAME == null) || (OS_VERSION == null)) { return false; } return (OS_NAME.startsWith(osNamePrefix)) && (OS_VERSION.startsWith(osVersionPrefix)); } private static String getSystemProperty(String property) { try { return System.getProperty(property); } catch (SecurityException ex) { System.err.println("Caught a SecurityException reading the system property '" + property + "'; the SystemUtils property value will default to null."); } return null; } public static boolean isJavaVersionAtLeast(float requiredVersion) { return JAVA_VERSION_FLOAT >= requiredVersion; } public static boolean isJavaVersionAtLeast(int requiredVersion) { return JAVA_VERSION_INT >= requiredVersion; } public static boolean isJavaAwtHeadless() { return JAVA_AWT_HEADLESS != null ? JAVA_AWT_HEADLESS.equals(Boolean.TRUE.toString()) : false; } public static File getJavaHome() { return new File(System.getProperty("java.home")); } public static File getJavaIoTmpDir() { return new File(System.getProperty("java.io.tmpdir")); } public static File getUserDir() { return new File(System.getProperty("user.dir")); } public static File getUserHome() { return new File(System.getProperty("user.home")); } }