we are forced to !
Struts1 works
Struts1 operating principle
1, initialize : struts framework for overall controller ActionServlet is a Servlet, which in web.xml configured to automatically start the Servlet, the overall controller reads the startup configuration file (struts-config.xml) configuration information for the struts in different modules initialize the corresponding object. ( Object-oriented )
2, sending a request : The user submits the form to the WEB server via a URL or submits a request , the requested data is passed to the web server using the HTTP protocol .
3, form filling : struts ActionServlet total control when the user submits the request data into the corresponding form object member variable.
4, the payment request : the controller according to the configuration information object ActionConfig distribute the request to a specific Action, corresponding formBean be passed in this Action excute () method .
5, handling business : Action generally only contain an excute () method, which is responsible for implementing the appropriate business logic ( call other business module ) returns after an ActionForward object . ActionForward object server forwards through the work .
6, returns the response : Action to different business processes result returns a response object to the total target controller .
7, find the response : The total processing operations controller based Action response object returned by the target , find the corresponding resource object , under normal circumstances for the jsp page .
8, in response to user : Target response object passes the results to resource object , the results presented to the user .
Struts1 advantages and disadvantages ( why use strust1)
1. Advantages:
① open source framework , a clear structure
② is the classic implementation of MVC (MVC is an idea , not a technology )
③ exception handling mechanism to achieve international
④ with powerful tag library
⑤ solve the JSP page there are a lot of JAVA code , easy to maintain them
⑥ in formBean will automatically submit , not to use the traditional get, set method to get the value , the value
2. Disadvantages:
① configure complex
② test is inconvenient
③ web container dependency
④ action is a single mode , you must set the thread-safe
Struts2 works
struts2 operating principle
1 client initializes a pointer to the Servlet container ( eg Tomcat) request
2 the request through a series of filters (Filter) ( These filters have a filter called ActionContextCleanUp optional , this filter Struts2 and other frameworks for the integration of helpful, for example : SiteMesh Plugin)
3 Next FilterDispatcher is called , FilterDispatcher please ask ActionMapper to decide whether you need to call this an Action
4 ActionMapper decide if you need to call an Action, FilterDispatcher processing of the request to ActionProxy
5 ActionProxy asking framework through Configuration Manager configuration file, find the need to call the Action class
6 ActionProxy create a ActionInvocation instance.
7 ActionInvocation instance naming scheme used to call , after the call to Action process , involving relevant interceptor (Intercepter) call.
8 Once the Action is finished , ActionInvocation responsible for the configuration struts.xml find the corresponding return results. Return result is usually ( but not always , it could be another one Action chain ) need to be expressed in a JSP or FreeMarker template . In that the process can be used Struts2 framework inherited label. In this process, the need to address ActionMapper
In the process all objects (Action, Results, Interceptors, etc. ) to create through ObjectFactory
Struts2 advantages and disadvantages ( ie why use struts2)
Struts2 will automatically validated. There are many, such as the International Resource files.
Struts2 development in the past, if you have not used any framework again , you can also quickly learn , adding to the Struts2 application development in the past, because it is simple enough .
large number of interceptors :
Struts2 itself provides a lot of reusable interceptors, such as type conversion interceptors, many times we get from the page parameter , this time it is of type String , we need to manually .
plug-in based framework :
Struts2 is a plug-in based framework , the community provides a lot of useful plug-ins, such as jfreechat / json , etc. Using these plug-ins can simplify our development , speed up the development progress.
struts2 greatest disadvantage than in a lot of web server to support the poor , for example, in websphere5.5, weblogic8.1 and earlier support is very investigation, the need to use the latest .
multiple views are supported:
support multiple views : jsp, freemarker, Veloctiy, as long as you wish, you can even make it easy to support the transformation pdf, with a project you can support a variety of views.
more modular :
compared with Struts1.X , Struts2 more modular , you can easily configure the information by function boundaries split into multiple files , easy to manage and develop teamwork .
integration with Spring :
compared with Struts1.x , Struts2 do not have to write your own singleton, further reducing the coupling between programs on Struts2 within itself, reducing the coupling of the framework itself .
based pojo easy to test :
In Struts1.x , I need out of this two Http Mock objects , makes it difficult to write unit tests for Action , compared with Struts1.x , Struts2 in Action is no longer dependent on the
HttpServletRequest and HttpServletResponse object that allows us to more easily write unit tests for Action .
Hibernate works
1. read and parse the configuration file
2. reads and parses the mapping information , create a SessionFactory
3. Open Sesssion
4. Creating Transaction Transation
5. persistence operations
6. commit the transaction
7. Close Session
8. closed SesstionFactory
Hibernate advantages and disadvantages
Benefits:
1: hibernate is based on open source technology ORMapping framework for lightweight JDBC package, using object-oriented thinking to manipulate the database .
2: hibernate provides session cache and secondary cache, the system does not require complex queries , the performance has improved.
3: Low -intrusive design
Disadvantages:
1: hibernate learning cost is too high .
2: not suitable for complex sql query ( statistics ) .
3: not suitable for a large number of aggregation operations ( stored procedure )
disadvantages added:
1, without writing SQL statements ( without editing JDBC), only need to operate the corresponding object on it, you can be able to store , update, delete , load objects that can improve production efficiency ;
2, because the use of Hibernate objects only need to operate on it, so we develop more objectified ;
3, using Hibernate, portability is good ( as long as the use of Hibernate standards development, replacing the database , you only need to configure the appropriate configuration files can, and do not need to do other tasks operation ) ;
4, Hibernate implements transparent persistence : When you save an object, the object does not inherit any class in Hibernate , implement any interface , just a pure simple object - called POJO objects ( object purest - this object does not inherit any third-party frameworks to achieve any of its classes and interfaces )
5, Hibernate is a framework without invasive , no invasive framework commonly known as lightweight framework
6, Hibernate code testing convenient.
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