Java/Junit：如何測試外部程序/進程/應用程序是否正在運行？

Question

我有一個運行在Windows 7上的Junit/Silkuli測試，它依賴於已經運行的外部程序。

如何檢查外部程序是否從測試內部運行？

Answer 1

您可以在java中運行命令「tasklist」並查看返回的列表以查看您的程序是否在列表中。是這樣的：

String program = "eclipse.exe"; //or any other process 
String listOfProcesses = getCommandOutput("tasklist"); 
if (listOfProcesses == null || listOfProcesses.isEmpty()) { 
     System.err.println("Unable to automatically determine if " + program + " is running"); 
    } else { 
     if (listOfProcesses.contains(program)) { 
      System.out.println(program + " is running!"); 
     } else { 
      System.out.println(program + " is not running!"); 
     } 
    }//else: process list can be retrieved 

，並使用如方法得到一個命令的輸出：

public static String getCommandOutput(String command) { 
    String output = null;  //the string to return 

    Process process = null; 
    BufferedReader reader = null; 
    InputStreamReader streamReader = null; 
    InputStream stream = null; 

    try { 
     process = Runtime.getRuntime().exec(command); 

     //Get stream of the console running the command 
     stream = process.getInputStream(); 
     streamReader = new InputStreamReader(stream); 
     reader = new BufferedReader(streamReader); 

     String currentLine = null; //store current line of output from the cmd 
     StringBuilder commandOutput = new StringBuilder(); //build up the output from cmd 
     while ((currentLine = reader.readLine()) != null) { 
      commandOutput.append(currentLine + "\n"); 
     } 

     int returnCode = process.waitFor(); 
     if (returnCode == 0) { 
      output = commandOutput.toString(); 
     } 

    } catch (IOException e) { 
     System.err.println("Cannot retrieve output of command"); 
     System.err.println(e); 
     output = null; 
    } catch (InterruptedException e) { 
     System.err.println("Cannot retrieve output of command"); 
     System.err.println(e); 
    } finally { 
     //Close all inputs/readers 

     if (stream != null) { 
      try { 
       stream.close(); 
      } catch (IOException e) { 
       System.err.println("Cannot close stream input! " + e); 
      } 
     } 
     if (streamReader != null) { 
      try { 
       streamReader.close(); 
      } catch (IOException e) { 
       System.err.println("Cannot close stream input reader! " + e); 
      } 
     } 
     if (reader != null) { 
      try { 
       reader.close(); 
      } catch (IOException e) { 
       System.err.println("Cannot close reader! " + e); 
      } 
     } 
    } 
    //Return the output from the command - may be null if an error occured 
    return output; 
}