[英]Unable to execute a simple “whoami” unix command using java program on the server
Im facing this strange issue of not being able to execute a simple "whoami" unix command on a AIX server. 我面临着一个奇怪的问题,即无法在AIX服务器上执行简单的“ whoami” unix命令。 I have a webapplication that is deployed on an AIX server.
我有一个部署在AIX服务器上的Web应用程序。 Now I want to see under which WAS user my webapplication is currently running.
现在,我想查看我的Web应用程序当前正在哪个WAS用户下运行。 So I added the below code:
所以我添加了以下代码:
public String whoami() throws Exception {
Process p = Runtime.getRuntime().exec("whoami");
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
String output = "";
while ((line = in.readLine()) != null) {
//System.out.println(line);
output += line;
}
in.close();
p.destroy();
return output;
}
}
The above code is added in a jar file which is referred by a JSP. 上面的代码被添加到JSP引用的jar文件中。 The JSP has to receive the output of the code above and it displays the WAS User name.
JSP必须接收上面代码的输出,并显示WAS用户名。 But when i deploy the webapplication on the server and try to observe the output, im getting an error message like
但是当我在服务器上部署Web应用程序并尝试观察输出时,我收到了类似的错误消息
Error 500: access denied (java.io.FilePermission <> execute)
错误500:访问被拒绝(java.io.FilePermission <>执行)
However, When I remove the above code and run my webapplication, everything runs fine. 但是,当我删除上述代码并运行Web应用程序时,一切运行正常。 What wron am i doing here.
我在这里做什么? Did I miss doing anything?
我想念什么吗? Please help.
请帮忙。 This is the first time im working on UNIX
这是我第一次在UNIX上工作
It looks like your web server has been configured with a Java security policy that prohibits executing external applications. 您的Web服务器似乎已配置了禁止执行外部应用程序的Java安全策略。
See http://java.sun.com/developer/onlineTraining/Programming/JDCBook/appA.html for information about Java Security Policies, and the documentation for your web server. 有关Java安全策略的信息以及Web服务器的文档,请参见http://java.sun.com/developer/onlineTraining/Programming/JDCBook/appA.html 。
You will need to supply (or edit) a policy file to contain something like: 您将需要提供(或编辑)策略文件以包含以下内容:
grant {
permission java.io.FilePermission
"/usr/bin/whoami", "execute";
};
Just out of curiosity Have you considered to use: 出于好奇,您是否考虑过使用:
user.name
System property in Java? Java中的系统属性?
AFAIK whoami is a shell command and Runtime#exec()
executes programs only. AFAIK whoami是一个shell命令,并且
Runtime#exec()
仅执行程序。
you can try Runtime.getRuntime().exec(new String[]{"sh","-c","whoami"})
to call sh
and let it execute whoami
您可以尝试
Runtime.getRuntime().exec(new String[]{"sh","-c","whoami"})
调用sh
并使其执行whoami
another thing: do you need to destroy the process after reading? 另一件事:阅读后是否需要销毁流程?
You can use the ProcessBuilder
class instead of getRuntime().exec("whoami")
. 您可以使用
ProcessBuilder
类代替getRuntime().exec("whoami")
。
Here is sample code 这是示例代码
import java.io.*;
import java.util.*;
public class DoProcessBuilder {
public static void main(String args[]) throws IOException {
if (args.length <= 0) {
System.err.println("Need command to run");
System.exit(-1);
}
Process process = new ProcessBuilder(args).start();
InputStream is = process.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;
System.out.printf("Output of running %s is:", Arrays.toString(args));
while ((line = br.readLine()) != null) {
System.out.println(line);
}
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.