public class JSONContextListener implements ServletContextAttributeListener {
private final Log log = LogFactory.getLog(JSONContextListener.class);
public void attributeAdded(ServletContextAttributeEvent event) {
if (event.getName().equals(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE)) {
// register LookupHelper so we can call methods on it
            ApplicationContext ctx = (ApplicationContext) event.getValue();
// check for null so we don't have to initialize Spring in tests
            if (ctx != null) {
log.debug("Registering jsonObjects for XmlHttpRequest to GlobalBridge");
JSONRPCBridge jsonBridge = JSONRPCBridge.getGlobalBridge();
Map jsonObjects = (Map) ctx.getBean("jsonObjects");
for (Object name : jsonObjects.keySet()) {
jsonBridge.registerObject(name, jsonObjects.get(name));
}
}
}
}
public void attributeReplaced(ServletContextAttributeEvent event) {
attributeAdded(event);
}
}
2.spring配置里的jsonObject
<!-- json registration -->
<bean name="jsonObjects" class="java.util.HashMap">
<constructor-arg>
<map>
<entry key="information" value-ref="informationJson"></entry>
</map>
</constructor-arg>
</bean>
<bean id="informationJson" class="com.vikings.tools.json.Information" >
<property name="informationDAO" ref="informationDAO" />
</bean>
3.web.xml里增加配置刚才写的listener
<listener>
<listener-class>com.vikings.tools.json.JSONContextListener</listener-class>
</listener>
到这里就不用这么写了
<jsp:useBean id="JSONRPCBridge" scope="session"
class="com.metaparadigm.jsonrpc.JSONRPCBridge" />
<% JSONRPCBridge.registerObject("myTestObject", aTestObject); %>这个也不需要
// Find the JSONRPCBridge for this session or create one
// if it doesn't exist. Note the bridge must be named "JSONRPCBridge"
// in the HttpSession for the JSONRPCServlet to find it.
HttpSession session = request.getSession();
JSONRPCBridge json_bridge = null;
json_bridge = (JSONRPCBridge) session.getAttribute("JSONRPCBridge");
if(json_bridge == null) {
json_bridge = new JSONRPCBridge();
session.setAttribute("JSONRPCBridge", json_bridge);
}