共计 2393 个字符,预计需要花费 6 分钟才能阅读完成。
通过解析 df 命令内容实现,获取以下信息:
[root@localhost ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 16324812 0 16324812 0% /dev
tmpfs 16342248 0 16342248 0% /dev/shm
tmpfs 16342248 271464 16070784 2% /run
tmpfs 16342248 0 16342248 0% /sys/fs/cgroup
/dev/sda3 451151536 201744672 226419856 48% /
/dev/sda1 999320 169864 760644 19% /boot
tmpfs 3268448 0 3268448 0% /run/user/0
实现代码:
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
@Slf4j
public class DiskUtils {
@Data
public static class Df {
private String filesystem;
private String blocks;
/** 已应用 */
private long used;
/** 残余可用 */
private long available;
/** 已使用率,0-100 的整数值 */
private int useRate;
/** 挂载目录,'/' 示意挂载在根目录 */
private String mountedOn;
}
public static Df df(String dir) {switch (OS.platform()) {
case WINDOWS:
Df df = new Df();
df.setAvailable(Long.MAX_VALUE);
return df;
}
Process process;
try {log.debug("df" + dir);
process = Runtime.getRuntime().exec("df" + dir);
InputStream inputStream = process.getInputStream();
// Filesystem 1K-blocks Used Available Use% Mounted on
// /dev/sdc 5814186096 5814169712 0 100% /home/spy-sd/sdc
List<String> lines = IOUtils.readLines(inputStream, StandardCharsets.UTF_8);
List<String> titles = getTitles(lines.get(0));
String[] values = lines.get(1).split("\\s+");
Df df = new Df();
for(int i = 0; i < titles.size(); i ++) {String title = titles.get(i);
switch (title.toLowerCase()) {case "filesystem": df.setFilesystem(values[i]);break;
case "1k-blocks": df.setBlocks(values[i]);break;
case "used": df.setUsed(Long.parseLong(values[i]));break;
case "available": df.setAvailable(Long.parseLong(values[i]));break;
case "use%": df.setUseRate(Integer.parseInt(values[i].replace("%", "")));break;
case "mountedon": df.setMountedOn(values[i]);break;
}
}
return df;
} catch (IOException e) {e.printStackTrace();
return null;
}
}
private static List<String> getTitles(String titlesLine) {List<String> titles = new ArrayList<>();
String[] titleArray = titlesLine.split("\\s+");
for(String title: titleArray) {if(title.equalsIgnoreCase("on")) {if(!titles.isEmpty()) {int lastIdx = titles.size() - 1;
titles.set(lastIdx, titles.get(lastIdx) + "On");
}
} else {titles.add(title);
}
}
return titles;
}
public static void main(String[] args) {Df df = df(new File("/home/spy-sd/sdc").getAbsolutePath());
log.debug("df={}", df);
}
}
Df 数据示例:
DiskUtils.Df(filesystem=/dev/sdc, blocks=5814186096, used=1652962708, available=3868180876, useRate=30, mountedOn=/home/spy-sd/sdc)
正文完