java - 获取当前文件夹中的可用空间

Question

我有这段 Java 代码，它获取 HDD 和 RAM 空间并检查可用空间。由于某种原因，它在 Linux 中无法正常工作。我每次都会看到警告消息。如何获取运行 Java 代码的当前文件夹的可用空间？

import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;

public final class EnvironmentCheck{

    public EnvironmentCheck(){

        // If the HDD Free Space is less than 200 Megabytes write message HDD is too low
        if (200 > checkHDDFreeSpace()){
            System.out.println("*** WARNING Hard Drive free space " + checkHDDFreeSpace() + " Megabytes " + "is too low! ***");
            // TODO write the same messgae into the log file
        }

        // If the RAM Free Space is less than 200 Megabytes write message HDD is too low
        if (200 > checkRAMFreeSpace()){
            System.out.println("*** WARNING RAM free space " + checkRAMFreeSpace() + " Megabytes " + "is too low! ***");
            // TODO write the same messgae into the log file
        }

    }

    /**
    * Get available HDD Free space from the system
    *
    * @return
    */
    public long checkHDDFreeSpace(){

        long availableSpace = 0;

        FileSystem fs = FileSystems.getDefault();
        for (FileStore store : fs.getFileStores()){

            try{
                availableSpace = store.getUsableSpace() / 1024;
                //System.out.println(availableSpace);
            }catch (IOException e){

            }
        }
        return availableSpace;
    }

    /**
    * Get available RAM Free memory
    *
    * @return
    */
    public long checkRAMFreeSpace(){
        return Runtime.getRuntime().freeMemory();
    }

}

Answer 1

我想你想找出你的文件夹所在分区(挂载mount)的可用空间。您收到警告消息是因为您在每次迭代中覆盖 avaialableSpace 变量

for (FileStore store : fs.getFileStores()){
    try{
            //gets overwritten in each iteration, hence you get the
            //warning every time
            availableSpace = store.getUsableSpace() / 1024;
            //System.out.println(availableSpace);
        }catch (IOException e){

    }
}

首先尝试找到与您的目录相对应的FileStore(例如，对于/usr/home/foouser，它可以是/usr/home > 然后仅获取该 FileStore 的大小