Where is the answer? action config/Interceptor/class/servlet

The project has been tested , In these two days, we have focused on sorting out the code logic of the tripartite payment system developed by the outsourcing team for our company . This afternoon, the Aegean conference room , A student in the development group shared his sorting results of payment result callback .

The overall timing of the payment result callback is ： After the payment channel has processed the user's payment information , Actively call the callback address provided by us when the payment is initiated , Push the payment result to us , After our treatment , Write back the string “ok” To inform the payment channel , The channel received this message , Notice of completion of payment results .

At the end of logic, a question is thrown . See the screenshot below for the code , That is, our signature has been verified 、 data verification 、 Update order payment results 、 Bookkeeping 、 Notify downstream merchants and wait for a series of logical processing , To write back a string “ok”.responseString The value of is “ok”. The program directly gives edb This object set A parameter , Then the program return Done. . We know , We must pass the current HttpServletResponse Of getWriter Of print() or write() Method to output this text message to the page . While calling this NotifyServiceIml Of Action There is no such sentence in . that , Here comes the question , Look at the notes below “ After setting this value , The platform will automatically return to the channel ”, How is automatic return to the channel realized ？ Where is it implemented ？ Then the next step is to find out where these codes are .

 

First , Brother, open action config file . Look at the backstage Action After successful processing , Corresponding jsp Is there any print in . however , Found no configuration jsp.

So next , Naturally, I think of Interceptor. Locate the corresponding Interceptor class . Through line by line analysis onResponse() Method , And I didn't find out getWriter() Such lines of code .

 

Strange ！ Some students suggested asking the outsourcing programmers directly after the meeting , You can tell by asking . I always like to dig the code first , I really can't ask again . therefore , I took over my colleague's laptop , Harden your head to analyze this Service And the code of its parent class , Maybe there's some sort of code . The result? , Including me , Four or five pairs of eyes did not find . I smile bitterly ：“ Yes. ！”

 

In fact, I still admit defeat . Went to the bathroom and returned to the station , Suddenly it occurred to me servlet. Hurry to find servlet-mapping. Sure enough , stay web.xml It's defined in servlet-mapping; Sure enough , In this ActionServlet In class , lookup getWriter The key word found the answer .

 

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