Linux/Windows系统下java获取磁盘和内存信息

import java.io.File;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.List;

import com.sun.management.OperatingSystemMXBean;

public class Test {

	public static void main(String[] args) {
		System.out.println("磁盘：" + getDisk());
		System.out.println("内存：" + getMemery());

	}

	/**
	 * TODO 获取文件系统使用率
	 * 
	 * @return
	 */
	private static List<String> getDisk() {
		// 操作系统
		List<String> list = new ArrayList<String>();
		for (char c = 'A'; c <= 'Z'; c++) {
			String dirName = c + ":/";
			File win = new File(dirName);
			if (win.exists()) {
				double total = win.getTotalSpace() / 1024.0 / 1024.0 / 1024.0;
				double free = win.getFreeSpace() / 1024.0 / 1024.0 / 1024.0;
				// 保留一位小数
				total = Double.valueOf(String.valueOf(total).substring(0, String.valueOf(total).indexOf(".") + 2));
				free = Double.valueOf(String.valueOf(free).substring(0, String.valueOf(free).indexOf(".") + 2));
				Double compare = (Double) (1 - free * 1.0 / total) * 100;
				String str = c + ":盘  总量:" + total + "G 剩余  " + free + "G 已使用 " + compare.intValue() + "%";
				list.add(str);
			}
		}
		return list;
	}

	/**
	 * TODO 获取内存使用率
	 * 
	 * @return
	 */
	private static String getMemery() {
		OperatingSystemMXBean osmxb = (com.sun.management.OperatingSystemMXBean) ManagementFactory
				.getOperatingSystemMXBean();
		// 总的物理内存+虚拟内存
		// long totalvirtualMemory = osmxb.getTotalSwapSpaceSize();
		// 物理内存（内存条）
		long physicalMemorySize = osmxb.getTotalPhysicalMemorySize();
		System.out.println("物理内存：" + physicalMemorySize / 1024.0 / 1024.0 / 1024.0);
		// 剩余的物理内存
		long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();
		System.out.println("总  的  内 存" + Math.round(physicalMemorySize / 1024.0 / 1024.0 / 1024.0));
		System.out.println(
				"使用的内存" + Math.round((physicalMemorySize - freePhysicalMemorySize) / 1024.0 / 1024.0 / 1024.0));
		Double compare = (Double) (1 - freePhysicalMemorySize * 1.0 / physicalMemorySize) * 100;
		String str = "内存已使用:" + compare.intValue() + "%";
		return str;
	}

}