Spring MVC返回错误响应的延迟结果
Spring MVC返回错误响应的延迟结果
提问于 2013-11-29 13:49:16
我使用spring mvc 3.2.4和jquery 1.9.0进行长时间轮询。我的应用程序部署在Tomcat 7.0.42上。我的spring配置文件如下：
应用程序Web.xml
<web-app 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"
version="3.0">
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>app</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
<async-supported>true</async-supported>
</servlet>
<servlet-mapping>
<servlet-name>app</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/app-servlet.xml
</param-value>
</context-param>
</web-app>Spring配置xml为：-
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<context:annotation-config/>
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
<context:component-scan base-package="com.webchat"/>
<bean id="defferedResult" class="com.exp.DeferredResultContainer"></bean>
</beans>用于发布数据的控制器如下所示
@RequestMapping(value = "/postComment", method = RequestMethod.POST)
public @ResponseBody String postComment(HttpServletRequest request) {
deferredResultContainer.updateAllResults(request.getParameter("comment"));
return "success";
}延迟结果容器类
public class DeferredResultContainer {
private final Set<DeferredResult<String>> deferredResults = Collections.synchronizedSet(new HashSet<DeferredResult<String>>() );
public void put(DeferredResult<String> deferredResult){
deferredResults.add(deferredResult);
}
public void updateAllResults(String value){
for (DeferredResult<String> deferredResult : deferredResults){
deferredResult.setResult(value);
}
}
public void remove(DeferredResult<String> deferredResult){
deferredResults.remove(deferredResult);
}
public int determineSize(){
return deferredResults.size();
}
}延迟结果的控制器如下所示
@RequestMapping(value = "/getComments", method = RequestMethod.GET)
@ResponseBody
public DeferredResult<String> getComments() throws Exception{
final DeferredResult<String> deferredResult= new DeferredResult<String>();
deferredResultContainer.put(deferredResult);
deferredResult.onTimeout(new Runnable() {
@Override public void run() {
deferredResultContainer.remove(deferredResult);
}
});
deferredResult.onCompletion(new Runnable() {
@Override public void run() {
deferredResultContainer.remove(deferredResult);
}
});
return deferredResult;
}当我试图通过ajax长轮询时，我得到了以下响应：
{"setOrExpired":false}而且onCompletion方法也没有被执行。
简单地说，控制器给出了完美的响应{"1":"2"}
@RequestMapping(value = "/test1", method = RequestMethod.GET)
@ResponseBody
public Map test1() throws Exception{
Map m1 = new HashMap<String, Object>();
m1.put("1", "2");
return m1;
}将其更改为下面并添加延迟结果后，我得到的响应为{"setOrExpired":true}
@RequestMapping(value = "/test", method = RequestMethod.GET)
@ResponseBody
public DeferredResult<Map> test() throws Exception{
DeferredResult<Map> result = new DeferredResult<Map>();
Map m1 = new HashMap<String, Object>();
m1.put("1", "2");
result.setResult(m1);
return result;
}轮询代码
$(document).ready(function() {
longPoll();
function longPoll(){
$.support.cors = true;
var path = "http://localhost:8080/WebChatExp/rest";
$.ajax({
url: path + "/getComments",
cache:false,
success: function(data){
//To Do
alert("Data" + JSON.stringify(data));
},
error: function(err, status, errorThrown ) {
},
type: "GET",
dataType: "json",
complete: longPoll,
timeout: 60000 // timeout every one minute
});
}我已经搜索了各种示例，但无法确定延迟结果是否需要任何额外的配置。请给我建议。
回答 1
Stack Overflow用户
发布于 2019-02-16 06:05:16
我知道在这种情况下(spring mvc 3.2.4)不可能成为问题，但仅供将来参考:我在spring boot 2.2.0.BUILD-SNAPSHOT (spring 5.1.5)中遇到了同样的问题。当您尝试使用webflux而不是传统的spring mvc应用程序返回DeferredResult时，会发生此错误。请记住，在新的webflux api中，您应该使用mono/flux，而不是DeferredResult。
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原文链接：
https://stackoverflow.com/questions/20279194
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