Javaシステム関連パラメータ取得
3989 ワード
今日luceneを見てみると、ソースコードにオペレーティングシステムや仮想マシンのプロパティのツールクラスがあり、後で必要に応じて貼り付けられています.
package org.apache.lucene.util;
import java.lang.reflect.Field;
import java.util.StringTokenizer;
/**
* Some useful constants.
**/
public final class Constants {
private Constants() {} // can't construct
/** JVM vendor info. */
public static final String JVM_VENDOR = System.getProperty("java.vm.vendor");
public static final String JVM_VERSION = System.getProperty("java.vm.version");
public static final String JVM_NAME = System.getProperty("java.vm.name");
public static final String JVM_SPEC_VERSION = System.getProperty("java.specification.version");
/** The value of <tt>System.getProperty("java.version")</tt>. **/
public static final String JAVA_VERSION = System.getProperty("java.version");
/** The value of <tt>System.getProperty("os.name")</tt>. **/
public static final String OS_NAME = System.getProperty("os.name");
/** True iff running on Linux. */
public static final boolean LINUX = OS_NAME.startsWith("Linux");
/** True iff running on Windows. */
public static final boolean WINDOWS = OS_NAME.startsWith("Windows");
/** True iff running on SunOS. */
public static final boolean SUN_OS = OS_NAME.startsWith("SunOS");
/** True iff running on Mac OS X */
public static final boolean MAC_OS_X = OS_NAME.startsWith("Mac OS X");
/** True iff running on FreeBSD */
public static final boolean FREE_BSD = OS_NAME.startsWith("FreeBSD");
public static final String OS_ARCH = System.getProperty("os.arch");
public static final String OS_VERSION = System.getProperty("os.version");
public static final String JAVA_VENDOR = System.getProperty("java.vendor");
private static final int JVM_MAJOR_VERSION;
private static final int JVM_MINOR_VERSION;
/** True iff running on a 64bit JVM */
public static final boolean JRE_IS_64BIT;
static {
final StringTokenizer st = new StringTokenizer(JVM_SPEC_VERSION, ".");
JVM_MAJOR_VERSION = Integer.parseInt(st.nextToken());
if (st.hasMoreTokens()) {
JVM_MINOR_VERSION = Integer.parseInt(st.nextToken());
} else {
JVM_MINOR_VERSION = 0;
}
boolean is64Bit = false;
try {
final Class<?> unsafeClass = Class.forName("sun.misc.Unsafe");
final Field unsafeField = unsafeClass.getDeclaredField("theUnsafe");
unsafeField.setAccessible(true);
final Object unsafe = unsafeField.get(null);
final int addressSize = ((Number) unsafeClass.getMethod("addressSize")
.invoke(unsafe)).intValue();
//System.out.println("Address size: " + addressSize);
is64Bit = addressSize >= 8;
} catch (Exception e) {
final String x = System.getProperty("sun.arch.data.model");
if (x != null) {
is64Bit = x.indexOf("64") != -1;
} else {
if (OS_ARCH != null && OS_ARCH.indexOf("64") != -1) {
is64Bit = true;
} else {
is64Bit = false;
}
}
}
JRE_IS_64BIT = is64Bit;
}
public static final boolean JRE_IS_MINIMUM_JAVA8 = JVM_MAJOR_VERSION > 1 || (JVM_MAJOR_VERSION == 1 && JVM_MINOR_VERSION >= 8);
public static final boolean JRE_IS_MINIMUM_JAVA9 = JVM_MAJOR_VERSION > 1 || (JVM_MAJOR_VERSION == 1 && JVM_MINOR_VERSION >= 9);
}