关于struts2注解Namespace的问题总结
2014-12-06 00:00
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@Scope("request") @Controller("dealDatasourceMonitorInfoController") @Namespace("/monitorDatabase/dealDatasourceMonitor") public class DealDatasourceMonitorInfoController extends BaseAction { private static Logger logger = LoggerFactory .getLogger(DealDatasourceMonitorInfoController.class); @Autowired @Qualifier("dealDatasourceMonitorInfoServiceImpl") private DealDatasourceMonitorInfoService datasourceMonitorInfoService; public String query() { try { if (queryDate == null) { errorMessage = "查询时间不允许为空"; return ERROR; } <span style="color:#ff6666;">System.out.println(this); System.out .println(SpringBeanUtil .getBeanFromSpringByBeanName("dealDatasourceMonitorInfoController"));</span> monitorDatasource = datasourceMonitorInfoService.query(queryDate);
上面红色标识的代码打印结果竟然不一样,太坑爹了
通过研究源码发现struts2与spring整合时bean对象的创建过程如下:
public Object buildBean(String beanName, Map<String, Object> extraContext, boolean injectInternal) throws Exception { Object o; if (appContext.containsBean(beanName)) { o = appContext.getBean(beanName); } else { Class beanClazz = getClassInstance(beanName); o = buildBean(beanClazz, extraContext); } if (injectInternal) { injectInternalBeans(o); } return o; }也就是说先从spring的applicationContext中找,如果找不到则由struts2自己创建,问题就在这。这里的beanName是类的完全限定名(包名+类名),所以appContext.containsBean(beanName)肯定是false,即如果一个action同时存在Namespace注解和Controller注解,那么该action至少存在两个实例,一个是由spring创建,一个是由struts2创建的,而DealDatasourceMonitorInfoController 中的this是由struts创建的,所以两个对象肯定不一样。
我们在使用struts2的配置文件配置action时<package name="userManage" extends="default" namespace="/sysadmin/userManage"><default-class-ref class="userManageController"></default-class-ref>如果这里的class是spring里的bean Id那么该action则是由spring创建的,如果是类的完全限定名则是由struts2自己创建的
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