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我有一個控制器和一個過濾器，我在其中注入一個特定的服務。 在那個服務中我有一個Hashmap，我嘗試存儲某些信息。我遇到的問題是，雖然看起來該服務的單個實例已創建並注入到我的控制器和我的過濾器中，但似乎有兩個Map實例。我爲什麼不知所措。無論我如何嘗試實例化地圖（或注入地圖），行爲仍然是相同的。Spring singleton @autowired服務和共享狀態
事實證明，問題是創建了兩個服務實例，並在控制器中注入了一個實例，在過濾器中注入了一個實例。我不清楚爲什麼會發生這種情況，以及如何解決它。
以下是代碼的提取物：
@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);
}
}
這裏是應用程序-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>任何幫助，非常感謝。
你有多少上下文？你可以發佈你的web.xml嗎？還有上下文配置？ – grid 2014-11-01 09:45:25