Question

我开发了Simple Web-Application，它将Source path作为输入参数，并且基于Source路径，批处理执行在该路径中进行，并将输出消息作为成功或失败返回。批处理执行是Assync所以我使用了Executors.newFixedThreadPool（3）。目前正在执行但是返回消息无法获取并且正在获得零点异常，如下所示。请检查我的代码并指导我在哪里出错。

<struts>
<constant name="struts.devMode" value="false" />
   <package name="metadataservice" extends="struts-default">



   <action name="Runner" 
            class="org.ms.proj.RunnerAction" 
            method="init">

            <result name="success">/Success.jsp</result>
      </action>

   </package>
</struts>

public class RunnerAction extends ActionSupport {

    public String init()
    {

        HttpServletRequest request = (HttpServletRequest) ActionContext
                .getContext().get(ServletActionContext.HTTP_REQUEST);
        String Sourcepath=request.getParameter("srcpath");
        System.out.println("Source Path :"+Sourcepath);
         ExecutorService executor = Executors.newFixedThreadPool(3);
         Callable<String> callable = new MyExecuorThread(Sourcepath);
         Future<String> future = executor.submit(callable);
         ThreadMonitor addfutur=new ThreadMonitor(future);
         addfutur.CheckThreadReturnValue();
        return SUCCESS;
    }
}

My Home.jsp

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="Runner" method="post">
<input type="text" value="" name="srcpath"/>
<input type="submit" value="Run">
</form>

public class ThreadMonitor {
    private List<Future<String>> myfutrelist;

    public ThreadMonitor(Future<String> future)
    {
        this.myfutrelist.add(future);
    }

    public void CheckThreadReturnValue()
    {
         for(Future<String> fut : myfutrelist){

                try {
                    System.out.println("Thread Return Method :"+fut.get());
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (ExecutionException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }   

            }
    }

public class MyExecuorThread  implements Callable<String>{

    private String srcpath;
    private int exitValue=0;
    public MyExecuorThread(String source)
    {
        this.srcpath=source;
    }

    @Override
    public String call() throws Exception {
        // TODO Auto-generated method stub
        String mylog = "";
        try {
            final File batchFile = new File("D://Runner//bin//runner.bat");
         ProcessBuilder builder = new ProcessBuilder();

        builder.directory(new File(srcpath));
          String[] cmd = { "cmd", "/c",batchFile.getAbsolutePath(),"-Dsonar.login="+"abc","-Dsonar.password="+"chn@27","-X"};

          for (int x = 0; x < cmd.length; x++) {
                System.out.println("Command :" + cmd[x]);   

            }
             builder.command(cmd);
        //  builder.redirectErrorStream(true);
             Process process;
             process = builder.start();
             InputStream is1 = process.getInputStream();
                InputStreamReader isr = new InputStreamReader(is1);
                BufferedReader br = new BufferedReader(isr);
                String line;
             File logfile;
             File logpath=new File(srcpath+File.separator+"LOG");
             if(logpath.isDirectory())
             {
                  logfile=new File(logpath+File.separator+"my.log");

             }
             else
             {
                 logpath.mkdir();
                 logfile=new File(logpath+File.separator+"my.log");
             }
             logfile.createNewFile();

            while ((line = br.readLine()) != null) {                            
                    System.out.println(line);                   
                 mylog+=line+"\n";                  
             }
                exitValue = process.exitValue();
             FileUtils.writeStringToFile(logfile,mylog);           

            process.getInputStream().close();
            process.getOutputStream().close();
            process.getErrorStream().close();
            process.destroy();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(exitValue==0)
        {
            //System.out.println("success");
            return "Analysis Success";
        }
        else
        {
            //System.out.println("failed");
            return "Analysis Failed";
        }

    }
                                         }

java.lang.NullPointerException
    org.ms.proj.ThreadMonitor.<init>(ThreadMonitor.java:12)
    org.ms.proj.RunnerAction.init(RunnerAction.java:30)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:606)
    ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:891)
    ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)
    ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
    com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
    com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
    ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)
    ognl.ASTMethod.getValueBody(ASTMethod.java:90)
    ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
    ognl.SimpleNode.getValue(SimpleNode.java:258)
    ognl.Ognl.getValue(Ognl.java:494)
    ognl.Ognl.getValue(Ognl.java:458)

请让我知道如何解决这个问题，以及如何在批量执行后获取返回消息。请告诉我哪里出错了，无论如何都会对我有很大的帮助。

WebApplication中的多线程批处理分析

0 个答案: