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我有一个控制器和一个过滤器，我在其中注入一个特定的服务。 在那个服务中我有一个Hashmap，我尝试存储某些信息。我遇到的问题是，虽然看起来该服务的单个实例已创建并注入到我的控制器和我的过滤器中，但似乎有两个Map实例。我为什么不知所措。无论我如何尝试实例化地图（或注入地图），行为仍然是相同的。Spring singleton @autowired服务和共享状态
事实证明，问题是创建了两个服务实例，并在控制器中注入了一个实例，在过滤器中注入了一个实例。我不清楚为什么会发生这种情况，以及如何解决它。
以下是代码的提取物：
@Controller
public MyController {
@Autowired
private MyService myService;
someEndpoint() {
....
myService.putData(key, value);
.....
}
}
public class MyFilter extends GenericFilterBean {
@Autowired
private MyService myService;
public void doFilter(...) {
//this is where I have a problem.
// the reference myService.myMap seems to be pointing to a different instance
// than the service.myMap in the controller which doesn't make any sense to me
// the filter obviously intercepts all requests so I would expect that after that particular
// endpoint is accessed the data will be there for subsequent requests
myService.getData(..);
}
.....
}
@Service
public class MyService {
private Map <String,String> myMap = new HashMap <String,String>();
public String getData(String key) {
return myMap.get(key);
}
public void putData(String key, String value){
myMap.put(key,value);
}
}
这里是应用程序-config.xml中
<?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:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:security="http://www.springframework.org/schema/security"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.2.xsd">
<context:component-scan base-package="com.mycompany.myPackage"/>
<context:annotation-config />
.......
<security:http
........
........
<security:custom-filter ref="myFilter" position="FORM_LOGIN_FILTER" />
....
...........
<bean class="com.mycompany.filters.MyFilter" id="myFilter"/>
和web.xml中的提取物
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/app-config.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>Dispatcher Servlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/app-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Dispatcher Servlet</servlet-name>
<url-pattern>/webservice/*</url-pattern>
</servlet-mapping>
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>任何帮助，非常感谢。
你有多少上下文？你可以发布你的web.xml吗？还有上下文配置？ – grid 2014-11-01 09:45:25