详解spring mvc对异步请求的处理

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
  http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
...
</web-app>

<!-- spring mvc -->
<servlet>
<servlet-name>SpringMvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>...</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
<async-supported>true</async-supported>
</servlet>

package org.springframework.samples.mvc.async;
 
import java.util.concurrent.Callable;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.async.WebAsyncTask;
 
@Controller
@RequestMapping("/async/callable")
public class CallableController {
  @RequestMapping("/response-body")
  public @ResponseBody Callable<String> callable() {
 
    return new Callable<String>() {
      @Override
      public String call() throws Exception {
        Thread.sleep(2000);
        return "Callable result";
      }
    };
  }
 
  @RequestMapping("/view")
  public Callable<String> callableWithView(final Model model) {
 
    return new Callable<String>() {
      @Override
      public String call() throws Exception {
        Thread.sleep(2000);
        model.addAttribute("foo", "bar");
        model.addAttribute("fruit", "apple");
        return "views/html";
      }
    };
  }
 
  @RequestMapping("/exception")
  public @ResponseBody Callable<String> callableWithException(
      final @RequestParam(required=false, defaultValue="true") boolean handled) {
 
    return new Callable<String>() {
      @Override
      public String call() throws Exception {
        Thread.sleep(2000);
        if (handled) {
          // see handleException method further below
          throw new IllegalStateException("Callable error");
        }
        else {
          throw new IllegalArgumentException("Callable error");
        }
      }
    };
  }
 
  @RequestMapping("/custom-timeout-handling")
  public @ResponseBody WebAsyncTask<String> callableWithCustomTimeoutHandling() {
 
    Callable<String> callable = new Callable<String>() {
      @Override
      public String call() throws Exception {
        Thread.sleep(2000);
        return "Callable result";
      }
    };
 
    return new WebAsyncTask<String>(1000, callable);
  }
 
  @ExceptionHandler
  @ResponseBody
  public String handleException(IllegalStateException ex) {
    return "Handled exception: " + ex.getMessage();
  }
 
}

@RequestMapping("/quotes")
@ResponseBody
public DeferredResult<String> quotes() {
 DeferredResult<String> deferredResult = new DeferredResult<String>();
 // Add deferredResult to a Queue or a Map...
 return deferredResult;
}
  
// In some other thread...
deferredResult.setResult(data);
// Remove deferredResult from the Queue or Map

<mvc:annotation-driven>
<!-- 可不设置，使用默认的超时时间 -->
  <mvc:async-support default-timeout="3000"/>
</mvc:annotation-driven>

function deferred(){
  $.get('quotes.htm',function(data){
    console.log(data);
    deferred();//每次请求完成,再发一次请求,避免客户端定时刷新来获取数据
  });
}