length file from /sys/fs/cgroup/ in Java?

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Read/convert an InputStream to a String 56 answers

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即使操作系统将文件长度报告为0 ，以下方法（使用Java NIO）仍然有效：

String file = "/sys/fs/cgroup/cpu,cpuacct/cpuacct.usage";
String content = new String(Files.readAllBytes(Paths.get(file)));

System.out.println(content); // 972897369764987

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I recommend the IOUtils class in the Apache Commons IO library.

As the content of those files is text, you can use the IOUtils.toString method.

String content = IOUtils.toString(new FileInputStream(file), "UTF-8");

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