[Java知识库]JAVA异步Web服务实现

public void submitFuture(final HttpServletRequest req,final Callable<CompletableFuture> task) throwsException{
  final String uri = req.getRequestURI();
  final Map<String,String[]> params = req.getParameterMap();
  final AsyncContext asyncContext = req.startAsync();
  asyncContext.getRequest().setAttribute("uri",uri);
asyncContext.getRequest().setAttribute("params",params);
asyncContext.setTimeout(asyncTimeoutInSeconds*1000);

if(asyncListener != null){
  asyncContext.addListener(asyncListener);
}
CompletableFuture future = task.call();
future.thenAccept(result->{
  HttpServletResponse resp = (HttpServletResponse)asyncContext.getResponse();
 try{
   if(result instanceof String){
     byte[] butes = result.getBytes("GBK");
     resp.setContentType("text/html;charset=gbk");
     resp.setContentLength(bytes.length);
     resp.getOutputStream().write(bytes);
   }else{
     write(resp,JSONUtils.toJSON(result));
   }
 }catch(Throwable e){
 resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); 
 try{
   LOG.error("get infoerror,uri:{},params:{}",uri,JSONUtils.toJSON(params),e);
 }catch(Exception ex){}
 }
}).exceptionally(e->{
  asyncContext.complete();
  return null;
});

}