由于我从来没有在网上找到一个好的答案，所以我花了很多时间来解决这个问题。我希望我能减轻别人的痛苦。 lsof 本身会打印出缺少值的水平输出，因此无法正确解析
要格式化lsof，需要使用命令：
lsof -F pcuftDsin
添加-F会垂直打印结果，让我解释每个部分。
-
lsof: 按进程获取所有打开文件的列表
-
-F：格式化输出垂直而不是水平
-
p：将在 PID 或（进程 ID）列前添加前缀
-
c: 将作为 COMMAND 或（进程名称）列的前缀
-
u: 将作为进程运行所在的用户列的前缀
-
f: 将作为文件描述符列的前缀
-
t: 为类型列添加前缀
-
D: 将作为设备列的前缀
-
s: 将为 SizeOff 列添加前缀
-
i: 会在 Node 列前加前缀
-
n: 将前缀名称或（文件路径）
输出：
p3026
ccom.apple.appkit.xpc.openAndSavePanelService
u501
fcwd
tDIR
D0x1000004
s704
i2
n/
ftxt
tREG
D0x1000004
s94592
i1152921500312434319
n/System/Library/Frameworks/AppKit.framework/Versions/C/XPCServices/com.apple.appkit.xpc.openAndSavePanelService.xpc/Contents/MacOS/com.apple.appkit.xpc.openAndSavePanelService
ftxt
tREG
D0x1000004
s27876
i45156619
n/Library/Preferences/Logging/.plist-cache.usI0gbvW
ftxt
tREG
D0x1000004
s28515184
i1152921500312399135
n/usr/share/icu/icudt64l.dat
ftxt
tREG
D0x1000004
s239648
i31225967
n/private/var/db/timezone/tz/2019c.1.0/icutz/icutz44l.dat
ftxt
tREG
D0x1000004
s3695464
i1152921500312406201
n/System/Library/CoreServices/SystemAppearance.bundle/Contents/Resources/SystemAppearance.car
ftxt
tREG
D0x1000004
s136100
i38828241
n/System/Library/Caches/com.apple.IntlDataCache.le.kbdx
如您所见，每一行都以上面分配的正确字母作为前缀。另一个需要注意的重要事情是，“进程 ID”、“进程名称”和用户将只打印一次每组打开的文件，对于数据库存储，我需要这些字段用于打印的每一行。我正在执行一个java项目，所以我用来解析它的代码如下所示：
public static void main(String[] args) {
String command = "lsof -F pcuftDsin";
String captureBody = "";
Process proc = null;
try {
proc = Runtime.getRuntime().exec(command);
} catch (IOException e) {
e.printStackTrace();
}
BufferedReader reader = new BufferedReader(new InputStreamReader(proc.getInputStream()));
String line = "";
String ProcessID = "";
String ProcessName = "";
String User = "";
String FD = "null";
String Type = "null";
String Device = "null";
String SizeOff = "null";
String Node = "null";
String File = "null";
while(true) {
try {
line = reader.readLine();
if (line == null) {
break;
} else {
if (line.startsWith("p")) {
ProcessID = line;
} else if (line.startsWith("c")) {
ProcessName = line;
} else if (line.startsWith("u")) {
User = line;
} else if (line.startsWith("f")) {
FD = line;
} else if (line.startsWith("t")) {
Type = line;
} else if (line.startsWith("D")) {
Device = line;
} else if (line.startsWith("s")) {
SizeOff = line;
} else if (line.startsWith("i")) {
Node = line;
} else if (line.startsWith("n")){
File = line;
System.out.println(ProcessID + "," + ProcessName + "," + User + "," + FD + "," + Type + "," + Device + "," + SizeOff + "," + Node + "," + File);
FD = "null";
Type = "null";
Device = "null";
SizeOff = "null";
Node = "null";
File = "null";
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
try {
proc.waitFor();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
输出
p94484,ccom.apple.CoreSimulator.CoreSim,u501,ftxt,tREG,D0x1000004,s239648,i31225967,n/private/var/db/timezone/tz/2019c.1.0/icutz/icutz44l.dat
因为我正在存储输出，所以我需要空字段来显示某些内容，我使用了 null，您可以使用任何内容作为默认文本，或者甚至只是为缺少的字段使用空字符串，并非所有字段都会被填充。如果有人对我如何提高代码性能有任何建议，我会全力以赴。