何时执行ServletRequestAware和ServletRequestAware相关操作
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public interface ServletRequestAware {
/**
* Sets the HTTP request object in implementing classes.
*
* @param request the HTTP request.
*/
public void setServletRequest(HttpServletRequest request);
}
具体action中的操作
public class Action extends ActionSupport implements SessionAware,ServletRequestAware{
protected Map session = null;
protected HttpServletRequest request = null;
@Override
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
@Override
public void setSession(Map map) {
this.session = map;
}
}
这样,就获得了request对象。
具体怎么什么时候执行setServletRequest(),现在看看ServletConfigInterceptor拦截器。
public class ServletConfigInterceptor extends AbstractInterceptor implements StrutsStatics {
public String intercept(ActionInvocation invocation) throws Exception {
final Object action = invocation.getAction();
final ActionContext context = invocation.getInvocationContext();
if (action instanceof ServletRequestAware) {
HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
((ServletRequestAware) action).setServletRequest(request);
}
if (action instanceof ServletResponseAware) {
HttpServletResponse response = (HttpServletResponse) context.get(HTTP_RESPONSE);
((ServletResponseAware) action).setServletResponse(response);
}
if (action instanceof ParameterAware) {
((ParameterAware) action).setParameters((Map)context.getParameters());
}
if (action instanceof ApplicationAware) {
((ApplicationAware) action).setApplication(context.getApplication());
}
if (action instanceof SessionAware) {
((SessionAware) action).setSession(context.getSession());
}
if (action instanceof RequestAware) {
((RequestAware) action).setRequest((Map) context.get("request"));
}
if (action instanceof PrincipalAware) {
HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
if(request != null) {
// We are in servtlet environment, so principal information resides in HttpServletRequest
((PrincipalAware) action).setPrincipalProxy(new ServletPrincipalProxy(request));
}
}
if (action instanceof ServletContextAware) {
ServletContext servletContext = (ServletContext) context.get(SERVLET_CONTEXT);
((ServletContextAware) action).setServletContext(servletContext);
}
return invocation.invoke();
}
}
注释:invocation.getAction()获取action对象, instanceof 判断action对象是否是默认特定的对象。如果是的话就是执行相应的代码。
/**
* Sets the HTTP request object in implementing classes.
*
* @param request the HTTP request.
*/
public void setServletRequest(HttpServletRequest request);
}
具体action中的操作
public class Action extends ActionSupport implements SessionAware,ServletRequestAware{
protected Map session = null;
protected HttpServletRequest request = null;
@Override
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
@Override
public void setSession(Map map) {
this.session = map;
}
}
这样,就获得了request对象。
具体怎么什么时候执行setServletRequest(),现在看看ServletConfigInterceptor拦截器。
public class ServletConfigInterceptor extends AbstractInterceptor implements StrutsStatics {
public String intercept(ActionInvocation invocation) throws Exception {
final Object action = invocation.getAction();
final ActionContext context = invocation.getInvocationContext();
if (action instanceof ServletRequestAware) {
HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
((ServletRequestAware) action).setServletRequest(request);
}
if (action instanceof ServletResponseAware) {
HttpServletResponse response = (HttpServletResponse) context.get(HTTP_RESPONSE);
((ServletResponseAware) action).setServletResponse(response);
}
if (action instanceof ParameterAware) {
((ParameterAware) action).setParameters((Map)context.getParameters());
}
if (action instanceof ApplicationAware) {
((ApplicationAware) action).setApplication(context.getApplication());
}
if (action instanceof SessionAware) {
((SessionAware) action).setSession(context.getSession());
}
if (action instanceof RequestAware) {
((RequestAware) action).setRequest((Map) context.get("request"));
}
if (action instanceof PrincipalAware) {
HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
if(request != null) {
// We are in servtlet environment, so principal information resides in HttpServletRequest
((PrincipalAware) action).setPrincipalProxy(new ServletPrincipalProxy(request));
}
}
if (action instanceof ServletContextAware) {
ServletContext servletContext = (ServletContext) context.get(SERVLET_CONTEXT);
((ServletContextAware) action).setServletContext(servletContext);
}
return invocation.invoke();
}
}
注释:invocation.getAction()获取action对象, instanceof 判断action对象是否是默认特定的对象。如果是的话就是执行相应的代码。
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