Petstore源码追踪记(3)－商业逻辑处理(五)

      if (urlMapping != null) {
            if (!urlMapping.useFlowHandler()) {
                currentScreen = urlMapping.getScreen();
　　　　　　　　//请加入侦察码，以本例来说，currentScreen =customer.screen
                System.out.println("currentScreen="+currentScreen);
            } else {
                // load the flow handler
                FlowHandler handler = null;
                String flowHandlerString = urlMapping.getFlowHandler();
                try {
                    handler = (FlowHandler)getClass().getClassLoader()
                       .loadClass(flowHandlerString).newInstance();
                    // invoke the processFlow(HttpServletRequest)
                    handler.doStart(request);
                    String flowResult = handler.processFlow(request);
                    handler.doEnd(request);
                    currentScreen = urlMapping.getResultScreen(flowResult);
                    // if there were no screens by the id then assume that the
result was
                    //the screen itself
                    if (currentScreen == null) currentScreen = flowResult;
               } catch (Exception ex) {
                   System.err.println("ScreenFlowManager caught loading
handler: " + ex);
               }

共7页  第1页 第2页 第3页 第4页 第5页 第6页 第7页