内存、磁盘容量查询

/**
* 计算各个磁盘的大小、已用空间、剩余空间； 只获取本地磁盘信息，不获取U盘等外设信息
* @return
*/
public List<Disk> diskSpaceGather() {
List<Disk> diskList = new ArrayList<Disk>();
FileSystemView fileSystemView = FileSystemView.getFileSystemView();
File[] roots = File.listRoots();
for (File file : roots) {
Disk disk = new Disk();
if (ParameterUtil.LOCAL_DISK_NAME.equals(fileSystemView
.getSystemTypeDescription(file))) {
disk.setDiskName(file.getAbsolutePath());
disk.setFreeSpace(file.getFreeSpace() / ParameterUtil.GB);
disk.setTotal(file.getTotalSpace() / ParameterUtil.GB);
disk.setUsed(file.getUsableSpace() / ParameterUtil.GB);
diskList.add(disk);
}
}
return diskList;
}

/**
* 计算物理内存空间大小,包括总的大小，已使用，剩余量
*/
public Map<String,Object> physicalMemoryGather() {

Map<String,Object> hashMap=new HashMap<String,Object>();
OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory
.getOperatingSystemMXBean();
String osName = System.getProperty("os.name");
long totalMemory = osmxb.getTotalPhysicalMemorySize()/ ParameterUtil.MB;
long freeMemory = osmxb.getFreePhysicalMemorySize()/ ParameterUtil.MB;
long usedMemory = (osmxb.getTotalPhysicalMemorySize() - osmxb.getFreePhysicalMemorySize())/ ParameterUtil.MB;
hashMap.put("osName", osName);
hashMap.put("totalMemory", totalMemory);
hashMap.put("freeMemory", freeMemory);
hashMap.put("usedMemory", usedMemory);
return hashMap;
}

自己设计的简单的Disk类
public class Disk {
private  Long used;  //已使用；
private  Long total; //总量；
private  String diskName;  //磁盘名称；
private  Long freeSpace;  //空闲空间；
public Disk() {
super();
}
public Long getUsed() {
return used;
}
public void setUsed(Long used) {
this.used = used;
}
public Long getTotal() {
return total;
}
public void setTotal(Long total) {
this.total = total;
}
public String getDiskName() {
return diskName;
}
public void setDiskName(String diskName) {
this.diskName = diskName;
}
public Long getFreeSpace() {
return freeSpace;
}
public void setFreeSpace(Long freeSpace) {
this.freeSpace = freeSpace;
}
public Disk(Long used, Long total, String diskName, Long freeSpace) {
super();
this.used = used;
this.total = total;
this.diskName = diskName;
this.freeSpace = freeSpace;
}

@Override
public String toString() {
String toString="";
toString=this.diskName+":"+"total "+this.total+"GB,used "+this.used+"GB,freeSpace "+this.freeSpace+"GB";
System.out.println(toString);
return toString;
}

}