Multithreading problem

public void doTest (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
DownLoadFile ld = new DownLoadFile ();
sysout (request) ;/ / org.apache.catalina.connector.RequestFacade @ 149f848
ld.setRequests (request);
ld.setResponses (response);
Thread t = new Thread (ld);
t.start ();
}

public void run () {
sysout (request) ;/ / org.apache.catalina.connector.RequestFacade @ 149f848
sysout (requests.getParameter ("applyNo")); / / Question 1 : Can not get at a null pointer
/ / Export main
try {
......
stream.write (readBytes) ;/ / Question 2: Report Connection reset by peer: socket write error
......
} catch {}
finally {
stream.close () ;/ / Question 3 : reported null pointer again
}
}
Scene Description : Analog multi-threaded download files,
Problem Description : 1 reception request can not be used in the run method .
2 time to write the document quoted Connection reset by peer: socket write error, reception no stopped what browser

initial contact with multithreading , trouble you to see it
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that must be a null pointer , requests you have no injection.
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My feeling is that after the end of your doTest , request should be in the other thread ( is your run ()) then use is problematic . But I do not know how to deal with a servlet container which is , is not this request in the doGet or doPost automatically expire after a ?
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sysout (request) ;/ / this request is how you pass into the ?
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private HttpServletRequest requests;
private void setRequests (HttpServletRequest request) {
this.requests = request;
}
response is so pass
Moreover, the run () method, but also do the following actions:
ServletOutputStream stream = responses.getOutputStream ();
responses.setContentType ("application / octet-stream");
responses.addHeader ("Content-Disposition");
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landlord seems to DownLoadFile as a servlet. So you want to know your method is now run on a new thread to run , and your doTest method is already over.
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requests.getParameter ("applyNo") the landlord to pay attention to your spelling
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and above sysout (request); is a right
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injection ? What do you mean , get.set it? Elaborate on it? I was white , so many do not understand




That is the run method executes ineffective cough ?
spelling is indeed a problem , it should be
sysout (requests);
sysout (requests.get ...);
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While still print to request, but the feeling is really unusable
test.
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easier to see and say something :

public void doTest(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
    DownLoadFile ld = new DownLoadFile();
    sysout(request);//org.apache.catalina.connector.RequestFacade@149f848 
    ld.setRequests(request);
    ld.setResponses(response);
    Thread t = new Thread(ld);
    t.start();
  ｝
  
  public void run() {
    sysout(request);//org.apache.catalina.connector.RequestFacade@149f848 
    sysout(requests.getParameter("applyNo")); //问题1：无法获取,报空指针
    //导出主程序
    try{
      ......
      stream.write(readBytes);//问题2：报Connection reset by peer: socket write error
     ......
    }catch{}
    finally {
      stream.close();//问题3：再次报空指针
    }
  }

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  While still print to request, but the feeling is really unusable
test.  

Personally, I do not feel so multi -threaded , so if you must use it, but also know how to package and hold request ( a request should have various limitations . Personally, I think this time after doGet or doPost request to sue end ) . Not recommended landlord tried to do in this regard , first lay the foundation of it