附件下载页面锁定怎么解决

jason2014

使用这个方法 /UI2/demo/actions/process/invokeAction/downloadFile.j 下载附件，发送了一个请求后页面会锁死，需等待下载完成后才能进行其他操作，请问有什么办法解决吗？

jishuang

开发版是单线程的只能等处理后才能支持其他的，在调用的时候用异步的方式看看

jason2014

jishuang 发表于 2017-1-9 11:58
开发版是单线程的只能等处理后才能支持其他的，在调用的时候用异步的方式看看 ...

开发版是单线程？意思是正式版没问题是吗？ 我是按/UI2/demo/actions/process/invokeAction/mainActivity.w这个demo的下载去做的，怎么异步啊？

jishuang

/UI2/demo/actions/process/invokeAction/downloadFile.j 就是servlet，可以按照servlet的异步请求处理看看

jason2014

jishuang 发表于 2017-1-9 14:50
/UI2/demo/actions/process/invokeAction/downloadFile.j 就是servlet，可以按照servlet的异步请求处理看 ...

我在downloadFile.j 这个类改成这样，在执行的时候到这里AsyncContext act = request.startAsync();报错，也不知道怎么回事，麻烦看一下

1. public class DownloadFile extends com.justep.ui.impl.JProcessorImpl  {
   
2. 
   
3.         @Override
   
4.         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   
5.                 System.out.println("进入Servlet的时间是：" + new Date() + ".");
   
6.                 AsyncContext act = request.startAsync();
   
7.                 new Thread(new AsynExecutor(act)).start();
   
8.                 System.out.println("结束Servlet的时间是：" + new Date() + ".");
   
9.         }
   
10. }
    
11. 
    
12. class AsynExecutor implements Runnable  {
    
13.         private AsyncContext act = null;
    
14. 
    
15.          public AsynExecutor(AsyncContext act) {  
    
16.          this.act = act;  
    
17.      }
    
18.          
    
19.         public void run() {
    
20.                 // TODO 自动生成的方法存根
    
21.         try {
    
22.                         Thread.sleep(3000);
    
23.                         System.out.println("业务执行完的时间是： " + new Date() + ".");
    
24.                         act.complete();
    
25.                 } catch (InterruptedException e) {
    
26.                         // TODO 自动生成的 catch 块
    
27.                         e.printStackTrace();
    
28.                 }  
    
29.         }
    
30. }

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报错信息：

1. 严重: Servlet.service() for servlet main-servlet threw exception
   
2. java.lang.AbstractMethodError: org.apache.catalina.connector.RequestFacade.startAsync()Ljavax/servlet/AsyncContext;
   
3.         at javax.servlet.ServletRequestWrapper.startAsync(ServletRequestWrapper.java:364)
   
4.         at DownloadFile.doGet(DownloadFile.java:46)
   
5.         at com.justep.ui.impl.JProcessorImpl.execute(Unknown Source)
   
6.         at com.justep.ui.JavaServer.runJava(Unknown Source)
   
7.         at com.justep.ui.JavaServer.doJ(Unknown Source)
   
8.         at com.justep.ui.JavaServer.service(Native Method)
   
9.         at com.justep.ui.servlet.MainServlet.service(Unknown Source)
   
10.         at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    
11.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    
12.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    
13.         at com.justep.portal.filter.RedirectFilter.doFilter(Unknown Source)
    
14.         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    
15.         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    
16.         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    
17.         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    
18.         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    
19.         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    
20.         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    
21.         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    
22.         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
    
23.         at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
    
24.         at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    
25.         at java.lang.Thread.run(Thread.java:745)

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jishuang

http://blog.csdn.net/yuhaiqiang_123/article/details/45873365

jason2014

jishuang 发表于 2017-1-10 15:26
http://blog.csdn.net/yuhaiqiang_123/article/details/45873365

是不是说要用Tomcat7才能用servlet3.0啊？但是平台升级Tomcat7太麻烦。。。根据帖子做的，还是有错，无语

1. 严重: Exception sending context initialized event to listener instance of class com.justep.x.loader.NativeLoaderListener
   
2. java.security.NoSuchAlgorithmException: Cannot find any provider supporting AES/ECB/PKCS5Padding
   
3.         at javax.crypto.Cipher.getInstance(Cipher.java:540)
   
4.         at com.justep.security.decrypt.DecryptClassLoader.findClass(Native Method)
   
5.         at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   
6.         at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   
7.         at com.justep.security.decrypt.Decrypt.getClass(Unknown Source)
   
8.         at com.justep.security.decrypt.Decrypt.createObject(Unknown Source)
   
9.         at com.justep.x.loader.NativeLoaderListener.a(Unknown Source)
   
10.         at com.justep.x.loader.NativeLoaderListener.contextInitialized(Unknown Source)
    
11.         at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
    
12.         at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
    
13.         at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    
14.         at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    
15.         at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    
16.         at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
    
17.         at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:672)
    
18.         at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1862)
    
19.         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    
20.         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    
21.         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    
22.         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    
23.         at java.lang.Thread.run(Thread.java:745)

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jishuang

根据错误到网上查找可能的原因
或者用企业版测试看看是否是多线程的