JAVA查看本地磁盘空间大小

Z时代
2024-01-10
分类：综合

java

利用java获取本地磁盘空间大小

public class FileUtil {
　　 public static long getFreeDiskSpace(String dirName) throws Exception{
    　　 //如果目录不存在
     　　File dir = new File(dirName);
    　　 if(!dir.exists()) return -1;
        try{
            // guess correct \'dir\' command by looking at the
            // operating system name
            String os = System.getProperty("os.name");
            String command;
            if ("Windows NT".equals(os) ||  "Windows 2000".equals(os) || "Windows 2003".equals(os) ||  "Windows XP".equals(os) ){
               　　 command = "cmd.exe /c dir " + dir.getAbsolutePath();
            }else{
            　　 return -1;
            }
            logger.debug(command);
            // run the dir command on the argument directory name
            Runtime runtime = Runtime.getRuntime();
            Process process = null;
            process = runtime.exec(command);
            if (process == null){
                return -1;
            }
            // read the output of the dir command
            // only the last line is of interest
            BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
            String freeSpace = null;
            while ((line = in.readLine()) != null){
                freeSpace = line;
            }
            if (freeSpace == null){
                return -1;
            }
            process.destroy();
            // remove dots & commas & leading and trailing whitespace
            freeSpace = freeSpace.trim();
            freeSpace = freeSpace.replaceAll("[\\.|,]", "");
            String[] items = freeSpace.split(" ");
            // the first valid numeric value in items after(!) index 0
            // is probably the free disk space

            //obtain dir usable byte
            int index = 1;
            while (index < items.length) {
                try{
                    long bytes = Long.parseLong(items[index++]);
                    return bytes;
                   }catch (NumberFormatException nfe){}
            }
            return -1;
        }
        catch (Exception e){
        　　throw e;
        }
    }

　　   /**
　　　　* @param args
  　　　　* @throws Exception
　　 */
　　 public static void main(String[] args) throws Exception {
　　　　 System.out.println(getFreeDiskSpace("E:/"));
　　}