Question

我有这样的场景：

我需要连接到远程服务器（linux）并执行du -h命令来查找特定文件夹的磁盘使用情况（比如/ home / oracle / TEST）。所以，我需要找到TEST文件夹的磁盘使用情况。并在java中打印结果。我怎么能这样做？

public static void main(String[] args) {

    String s = null; 

                try { 

                // run the Unix "ps -ef" command 
                    Socket s1=new Socket("10.1.7.237",1521);
                    System.out.println(s1.isConnected());
                    System.out.println(s1.getRemoteSocketAddress());
                    System.out.println("connected");
                    System.out.println();

                     PrintWriter wr=new PrintWriter(new OutputStreamWriter(s1.getOutputStream()),true);  
                     wr.println("Hi Server...");  
                     wr.flush();  
                     BufferedReader br=new BufferedReader(new  InputStreamReader(s1.getInputStream()));   
                     System.out.println(br.readLine());   
                    Process p = Runtime.getRuntime().exec("du -h");

                    BufferedReader stdInput = new BufferedReader(new  InputStreamReader(p.getInputStream())); 

                    BufferedReader stdError = new BufferedReader(new  InputStreamReader(p.getErrorStream())); 

                // read the output from the command 

                    System.out.println("Here is the standard output of the command:\n"); 
                    while ((s = stdInput.readLine()) != null) { 
                        System.out.println(s); 
                    } 
                    // read any errors from the attempted command 

                    System.out.println("Here is the standard error of the command (if any):\n"); 
                    while ((s = stdError.readLine()) != null) { 
                        System.out.println(s); 
                    } 

                    System.exit(0); 
                } 
                catch (IOException e) { 
                    System.out.println("exception happened - here's what I know: "); 
                    e.printStackTrace(); 
                    System.out.println(e.getMessage());
                    System.exit(-1); 
            } 
            }

我也尝试了这个但得到了这个例外：

    Cannot run program "du": CreateProcess error=2, The system cannot find the file specified
java.io.IOException: Cannot run program "du": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at testprog.main(testprog.java:27)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(Unknown Source)
    at java.lang.ProcessImpl.start(Unknown Source)
    ... 5 more

Answer 1

我认为你实际上并没有在远程服务器上执行du -h命令。 Runtime.getRuntime（）获取本地主机上的Runtime实例。您应该使用可以远程登录到远程主机并在那里执行命令的库，例如http://commons.apache.org/proper/commons-net/

你可以在这里看到：http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html 这个RunTime在主机上获得主机envairorment和exec“du -h”而不是在远程服务器上

Answer 2

在Java中执行命令时，您不在经典shell中。因此，您无权访问相同的环境变量，内置命令等。试试/usr/bin/du

Answer 3

您无法直接使用Runtime.getRuntime().exec("du -h");在远程计算机上执行某些操作。该命令在已启动java程序的机器上执行。

How do I run SSH commands on remote system using Java?回答了您的问题。

Answer 4

尝试：

Runtime.getRuntime().exec("ssh ${hostname-goes-here} du -h /path/to/folder");

当然，您需要在客户端的路径上提供ssh，并且为了使上述命令有效，您需要将公钥添加到{ {1}}档案。

运行du -f linux命令并在java中获取结果

4 个答案: