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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。
package cn.hutool.system;
import cn.hutool.core.convert.Convert;
import cn.hutool.core.lang.Singleton;
import cn.hutool.core.util.StrUtil;
import cn.hutool.core.util.SystemPropsUtil;
import java.io.PrintWriter;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.CompilationMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryManagerMXBean;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadMXBean;
import java.util.List;
/**
* Java的System类封装工具类。
* 参考：http://blog.csdn.net/zhongweijian/article/details/7619383
*
* @author Looly
*/
public class SystemUtil extends SystemPropsUtil {
// ----- Java运行时环境信息 -----/
/**
* Java 运行时环境规范名称的KEY
*/
public final static String SPECIFICATION_NAME = SystemPropsKeys.SPECIFICATION_NAME;
/**
* Java 运行时环境版本的KEY
*/
public final static String VERSION = SystemPropsKeys.VERSION;
/**
* Java 运行时环境规范版本的KEY
*/
public final static String SPECIFICATION_VERSION = SystemPropsKeys.SPECIFICATION_VERSION;
/**
* Java 运行时环境供应商的KEY
*/
public final static String VENDOR = SystemPropsKeys.VENDOR;
/**
* Java 运行时环境规范供应商的KEY
*/
public final static String SPECIFICATION_VENDOR = SystemPropsKeys.SPECIFICATION_VENDOR;
/**
* Java 供应商的 URL的KEY
*/
public final static String VENDOR_URL = SystemPropsKeys.VENDOR_URL;
/**
* Java 安装目录的KEY
*/
public final static String HOME = SystemPropsKeys.HOME;
/**
* 加载库时搜索的路径列表的KEY
*/
public final static String LIBRARY_PATH = SystemPropsKeys.LIBRARY_PATH;
/**
* 默认的临时文件路径的KEY
*/
public final static String TMPDIR = SystemPropsKeys.TMPDIR;
/**
* 要使用的 JIT 编译器的名称的KEY
*/
public final static String COMPILER = SystemPropsKeys.COMPILER;
/**
* 一个或多个扩展目录的路径的KEY
*/
public final static String EXT_DIRS = SystemPropsKeys.EXT_DIRS;
// ----- Java虚拟机信息 -----/
/**
* Java 虚拟机实现名称的KEY
*/
public final static String VM_NAME = SystemPropsKeys.VM_NAME;
/**
* Java 虚拟机规范名称的KEY
*/
public final static String VM_SPECIFICATION_NAME = SystemPropsKeys.VM_SPECIFICATION_NAME;
/**
* Java 虚拟机实现版本的KEY
*/
public final static String VM_VERSION = SystemPropsKeys.VM_VERSION;
/**
* Java 虚拟机规范版本的KEY
*/
public final static String VM_SPECIFICATION_VERSION = SystemPropsKeys.VM_SPECIFICATION_VERSION;
/**
* Java 虚拟机实现供应商的KEY
*/
public final static String VM_VENDOR = SystemPropsKeys.VM_VENDOR;
/**
* Java 虚拟机规范供应商的KEY
*/
public final static String VM_SPECIFICATION_VENDOR = SystemPropsKeys.VM_SPECIFICATION_VENDOR;
// ----- Java类信息 -----/
/**
* Java 类格式版本号的KEY
*/
public final static String CLASS_VERSION = SystemPropsKeys.CLASS_VERSION;
/**
* Java 类路径的KEY
*/
public final static String CLASS_PATH = SystemPropsKeys.CLASS_PATH;
// ----- OS信息 -----/
/**
* 操作系统的名称的KEY
*/
public final static String OS_NAME = SystemPropsKeys.OS_NAME;
/**
* 操作系统的架构的KEY
*/
public final static String OS_ARCH = SystemPropsKeys.OS_ARCH;
/**
* 操作系统的版本的KEY
*/
public final static String OS_VERSION = SystemPropsKeys.OS_VERSION;
/**
* 文件分隔符（在 UNIX 系统中是“/”）的KEY
*/
public final static String FILE_SEPARATOR = SystemPropsKeys.FILE_SEPARATOR;
/**
* 路径分隔符（在 UNIX 系统中是“:”）的KEY
*/
public final static String PATH_SEPARATOR = SystemPropsKeys.PATH_SEPARATOR;
/**
* 行分隔符（在 UNIX 系统中是“\n”）的KEY
*/
public final static String LINE_SEPARATOR = SystemPropsKeys.LINE_SEPARATOR;
// ----- 用户信息 -----/
/**
* 用户的账户名称的KEY
*/
public final static String USER_NAME = SystemPropsKeys.USER_NAME;
/**
* 用户的主目录的KEY
*/
public final static String USER_HOME = SystemPropsKeys.USER_HOME;
/**
* 用户的当前工作目录的KEY
*/
public final static String USER_DIR = SystemPropsKeys.USER_DIR;
/**
* 获取当前进程 PID
*
* @return 当前进程 ID
*/
public static long getCurrentPID() {
return Long.parseLong(getRuntimeMXBean().getName().split("@")[0]);
}
/**
* 返回Java虚拟机类加载系统相关属性
*
* @return {@link ClassLoadingMXBean}
* @since 4.1.4
*/
public static ClassLoadingMXBean getClassLoadingMXBean() {
return ManagementFactory.getClassLoadingMXBean();
}
/**
* 返回Java虚拟机内存系统相关属性
*
* @return {@link MemoryMXBean}
* @since 4.1.4
*/
public static MemoryMXBean getMemoryMXBean() {
return ManagementFactory.getMemoryMXBean();
}
/**
* 返回Java虚拟机线程系统相关属性
*
* @return {@link ThreadMXBean}
* @since 4.1.4
*/
public static ThreadMXBean getThreadMXBean() {
return ManagementFactory.getThreadMXBean();
}
/**
* 返回Java虚拟机运行时系统相关属性
*
* @return {@link RuntimeMXBean}
* @since 4.1.4
*/
public static RuntimeMXBean getRuntimeMXBean() {
return ManagementFactory.getRuntimeMXBean();
}
/**
* 返回Java虚拟机编译系统相关属性
* 如果没有编译系统，则返回{@code null}
*
* @return {@link CompilationMXBean} ，如果没有编译系统，则返回{@code null}
* @since 4.1.4
*/
public static CompilationMXBean getCompilationMXBean() {
return ManagementFactory.getCompilationMXBean();
}
/**
* 返回Java虚拟机运行下的操作系统相关信息属性
*
* @return {@link OperatingSystemMXBean}
* @since 4.1.4
*/
public static OperatingSystemMXBean getOperatingSystemMXBean() {
return ManagementFactory.getOperatingSystemMXBean();
}
/**
* 获取Java虚拟机中的{@link MemoryPoolMXBean}列表
* The Java virtual machine can have one or more memory pools. It may add or remove memory pools during execution.
*
* @return a list of MemoryPoolMXBean objects.
*/
public static List getMemoryPoolMXBeans() {
return ManagementFactory.getMemoryPoolMXBeans();
}
/**
* 获取Java虚拟机中的{@link MemoryManagerMXBean}列表
* The Java virtual machine can have one or more memory managers. It may add or remove memory managers during execution.
*
* @return a list of MemoryManagerMXBean objects.
*/
public static List getMemoryManagerMXBeans() {
return ManagementFactory.getMemoryManagerMXBeans();
}
/**
* 获取Java虚拟机中的{@link GarbageCollectorMXBean}列表
*
* @return {@link GarbageCollectorMXBean}列表
*/
public static List getGarbageCollectorMXBeans() {
return ManagementFactory.getGarbageCollectorMXBeans();
}
/**
* 取得Java Virtual Machine Specification的信息。
*
* @return {@link JvmSpecInfo}对象
*/
public static JvmSpecInfo getJvmSpecInfo() {
return Singleton.get(JvmSpecInfo.class);
}
/**
* 取得Java Virtual Machine Implementation的信息。
*
* @return {@link JvmInfo}对象
*/
public static JvmInfo getJvmInfo() {
return Singleton.get(JvmInfo.class);
}
/**
* 取得Java Specification的信息。
*
* @return {@link JavaSpecInfo}对象
*/
public static JavaSpecInfo getJavaSpecInfo() {
return Singleton.get(JavaSpecInfo.class);
}
/**
* 取得Java Implementation的信息。
*
* @return {@link JavaInfo}对象
*/
public static JavaInfo getJavaInfo() {
return Singleton.get(JavaInfo.class);
}
/**
* 取得当前运行的JRE的信息。
*
* @return {@link JavaRuntimeInfo}对象
*/
public static JavaRuntimeInfo getJavaRuntimeInfo() {
return Singleton.get(JavaRuntimeInfo.class);
}
/**
* 取得OS的信息。
*
* @return {@code OsInfo}对象
*/
public static OsInfo getOsInfo() {
return Singleton.get(OsInfo.class);
}
/**
* 取得User的信息。
*
* @return {@code UserInfo}对象
*/
public static UserInfo getUserInfo() {
return Singleton.get(UserInfo.class);
}
/**
* 取得Host的信息。
*
* @return {@link HostInfo}对象
*/
public static HostInfo getHostInfo() {
return Singleton.get(HostInfo.class);
}
/**
* 取得Runtime的信息。
*
* @return {@link RuntimeInfo}对象
*/
public static RuntimeInfo getRuntimeInfo() {
return Singleton.get(RuntimeInfo.class);
}
/**
* 获取JVM中内存总大小
*
* @return 内存总大小
* @since 4.5.4
*/
public static long getTotalMemory() {
return Runtime.getRuntime().totalMemory();
}
/**
* 获取JVM中内存剩余大小
*
* @return 内存剩余大小
* @since 4.5.4
*/
public static long getFreeMemory() {
return Runtime.getRuntime().freeMemory();
}
/**
* 获取JVM可用的内存总大小
*
* @return JVM可用的内存总大小
* @since 4.5.4
*/
public static long getMaxMemory() {
return Runtime.getRuntime().maxMemory();
}
/**
* 获取总线程数
*
* @return 总线程数
*/
public static int getTotalThreadCount() {
ThreadGroup parentThread = Thread.currentThread().getThreadGroup();
while (null != parentThread.getParent()) {
parentThread = parentThread.getParent();
}
return parentThread.activeCount();
}
// ------------------------------------------------------------------ Dump
/**
* 将系统信息输出到{@link System#out}中。
*/
public static void dumpSystemInfo() {
dumpSystemInfo(new PrintWriter(System.out));
}
/**
* 将系统信息输出到指定{@link PrintWriter}中。
*
* @param out {@link PrintWriter}输出流
*/
public static 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.println(getRuntimeInfo());
out.println("--------------");
out.flush();
}
/**
* 输出到{@link StringBuilder}。
*
* @param builder {@link StringBuilder}对象
* @param caption 标题
* @param value 值
*/
protected static void append(StringBuilder builder, String caption, Object value) {
builder.append(caption).append(StrUtil.nullToDefault(Convert.toStr(value), "[n/a]")).append("\n");
}
}
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