Spring: java.lang.IllegalStateException: getOutputStream() wurde bereits für diese Antwort aufgerufen

Hallo mein erstes Problem war, dass meine Anwendung ein Dokument (doc oder pdf) herunterladen musste, im Internet suchte ich eine Lösung und ich angepasst es zu meinem Code.Spring: java.lang.IllegalStateException: getOutputStream() wurde bereits für diese Antwort aufgerufen

Dies ist Methode in @Service wo i blob

aus der Datenbank abrufen

@Override 
public boolean downloadCV(long idDocente, HttpServletResponse response) throws SQLException{ 
    Connection con = null; 
    try{ 
     con = DBCon.establishConnection(); 
     String sql = "SELECT cv,content_type,filename FROM Docenti_pj where id_docente=? "; 
     PreparedStatement ps = con.prepareStatement(sql); 
     ps.setLong(1 , idDocente); 
     ResultSet rs = ps.executeQuery(); 
      while(rs.next()) { 
       Blob blob = rs.getBlob("cv"); //prende il blob del curriculum 
       String contentType = rs.getString("content_Type"); 
       String fileName = rs.getString("filename"); 
       if(blob!=null){ 
        InputStream inputStream = blob.getBinaryStream(); 
        response.setHeader("Content-Disposition", "inline;filename=\"" +fileName+ "\""); 
        OutputStream out = response.getOutputStream(); 
        response.setContentType(contentType); 
        IOUtils.copy(inputStream, out); 
        out.flush(); 
        out.close(); 
        return true; 
       } 
       else 
        return false; 
      } 
    } 
    catch(Exception e){ 
     System.out.println("errore"); 
     e.printStackTrace(); 
    } 
    finally{con.close();} 
    return false; 
}

Dies ist Methode in meinem Controller

@RequestMapping(value="/docente_cv") 
    public String downloadCurriculum(@RequestParam long idDocente, Model model, HttpServletResponse response){ 
    try{ 
     if(docenteService.downloadCV(idDocente,response)) 
      return "redirect:/docente_profilo?IdDocente="+idDocente+"&cvdownload=true"; 
     else 
      return "redirect:/docente_profilo?IdDocente="+idDocente+"&cvdownload=false"; 

    }catch(Exception e){ 
     String message = "Eccezione --> "+e.getMessage(); 
     model.addAttribute("message", message); 
     return "redirect:/listaDocenteTot"; 
    } 
}

Alles funktioniert prima, aber ich bekomme diese Fehler jedes Mal in log i ein Dokument herunterladen:

Jan 31, 2017 11:20:13 AM org.apache.catalina.core.ApplicationDispatcher invoke 
SEVERE: Servlet.service() for servlet jsp threw exception 
java.lang.IllegalStateException: getOutputStream() has already been called for this response 
at org.apache.catalina.connector.Response.getWriter(Response.java:564) 
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:212) 
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109) 
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109) 
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109) 
at org.springframework.security.web.context.OnCommittedResponseWrapper.getWriter(OnCommittedResponseWrapper.java:133) 
at org.springframework.security.web.context.SaveContextOnUpdateOrErrorResponseWrapper.getWriter(SaveContextOnUpdateOrErrorResponseWrapper.java:40) 
at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:115) 
at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:108) 
at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:176) 
at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:120) 
at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:75) 
at org.apache.jsp.WEB_002dINF.jsp.ExceptionPage_jsp._jspService(ExceptionPage_jsp.java:368) 
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438) 
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396) 
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:720) 
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:584) 
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:523) 
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:160) 
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) 
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244) 
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027) 
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971) 
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316) 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:157) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213) 
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176) 
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) 
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:509) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1104) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
at java.lang.Thread.run(Thread.java:745)

Und:

Jan 31, 2017 11:20:13 AM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [springmvc] in context with path  [/ProjectWorkMaven] threw exception [java.lang.IllegalStateException: getOutputStream() has already been called for this response] with root cause 
java.lang.IllegalStateException: getOutputStream() has already been called for this response 
at org.apache.catalina.connector.Response.getWriter(Response.java:564) 
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:212) 
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109) 
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109) 
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109) 
at org.springframework.security.web.context.OnCommittedResponseWrapper.getWriter(OnCommittedResponseWrapper.java:133) 
at org.springframework.security.web.context.SaveContextOnUpdateOrErrorResponseWrapper.getWriter(SaveContextOnUpdateOrErrorResponseWrapper.java:40) 
at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:115) 
at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:108) 
at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:176) 
at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:120) 
at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:75) 
at org.apache.jsp.WEB_002dINF.jsp.ExceptionPage_jsp._jspService(ExceptionPage_jsp.java:368) 
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438) 
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396) 
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:720) 
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:584) 
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:523) 
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:160) 
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) 
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244) 
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027) 
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971) 
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316) 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:157) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213) 
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176) 
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) 
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:509) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1104) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
at java.lang.Thread.run(Thread.java:745)

Gibt es eine bessere Lösung, um mit dem Herunterladen von Dokumenten im Frühjahr zu arbeiten? Ich habe in DB alle Dateiinformationen gespeichert. Oder gibt es eine bessere Möglichkeit, diesen Code zu verwenden, um diese Ausnahme zu vermeiden?

Quelle

2017-01-31 Mike

Sie entweder herunterladen oder umleiten ... Sie können nicht beides tun. Sie leiten nach dem Download um, der nicht funktioniert. –

Wie Deinum gesagt, Sie nicht downalod und umleiten können Sie diesen Code verwenden können:

@RequestMapping(method = { RequestMethod.GET }, value = { "/docente_cv" }) 
public ResponseEntity<InputStreamResource> downloadCsv(@PathVariable("idForm") String idForm) 
{ 
    Connection con = null; 
    String fileName = ""; 
    try 
    { 
     con = DBCon.establishConnection(); 
      String sql = "SELECT cv,content_type,filename FROM Docenti_pj where id_docente=? "; 
      PreparedStatement ps = con.prepareStatement(sql); 
      ps.setLong(1 , idDocente); 
      ResultSet rs = ps.executeQuery(); 
      while(rs.next()) 
     { 
      Blob blob = rs.getBlob("cv"); //prende il blob del curriculum 
        String contentType = rs.getString("content_Type"); 
        fileName = rs.getString("filename"); 
      if(blob!=null) 
      { 
          InputStream inputStream = blob.getBinaryStream(); 
       response.setHeader("Content-Disposition", "inline;filename=\"" +fileName+ "\""); 
       HttpHeaders respHeaders = new HttpHeaders(); 
       MediaType mediaType = MediaType.parseMediaType(contentType) 
        respHeaders.setContentType(mediaType); 
        respHeaders.setContentLength(file.length()); 
        respHeaders.setContentDispositionFormData("attachment", fileName); 
        InputStreamResource isr = new InputStreamResource(inputStream); 
        return new ResponseEntity<InputStreamResource>(isr, respHeaders, HttpStatus.OK); 
      } 
      else 
      { 
       return new ResponseEntity<InputStreamResource>(HttpStatus.NO_CONTENT); 
      } 
     } 
    } 
    catch (Exception e) 
    { 
     String message = "Errore nel download del file "+fileName+"; "+e.getMessage(); 
     logger.error(message, e); 
     return new ResponseEntity<InputStreamResource>(HttpStatus.INTERNAL_SERVER_ERROR); 
    } 
    finally 
    { 
     if(con != null) 
     con.close(); 
    } 
}

Ich hoffe, es ist nützlich

Angelo

Quelle

2017-01-31 12:01:39

Ich denke, dass dies wahrscheinlich mein Problem lösen wird, aber ich möchte "@Controller" und "@Service" aufteilen. Es ist richtig, die Verbindung in einer '@Controller' Klasse zu öffnen, wenn ich es nur in '@ Service' mache? – Mike

Übrigens testet Ihr Code Ergebnis 'Closed Connection' Ausnahme und Download funktioniert nicht, ich versuche, es zu lösen, werde ich Sie über irgendwelche Nachrichten bemerken. – Mike

Nun, Sie sollten sich an Ihren Fall anpassen; Ich würde nicht das Verbindungsobjekt in einem Controller verwenden, aber ich begann von Ihrem Code und gab Ihnen eine Probe –

es gelöst!

Ich musste nur Code in der "@Controller" -Klasse ändern, so dass ich nur umleiten, wenn das Dokument nicht gefunden oder Ausnahme gefangen wird.

Quelle

2017-01-31 13:22:41 Mike

Spring: java.lang.IllegalStateException: getOutputStream() wurde bereits für diese Antwort aufgerufen

Antwort

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