Struts 2--struts 2 access to SERVLETAPI objects

Servletap parsing: API (Application Programming Interface) application programming interface.

Servletapi is a set of interfaces and classes related to Servlets.

To enable access to Servletapi objects, Struts 2 offers a number of ways, but it comes down to two broad categories:

1. How to access the SERVLETAPI decoupling

2. Access mode coupled to the SERVLETAPI

The decoupling method is described below:

1. Use the Actioncontex class to get the map object that corresponds to the Servletapi object.

 Public classLoginaction Implements Action {    PrivateUserInfo user =NewUserInfo (); @Override PublicString Execute () throws Exception {if(User.getusername (). Equals ("Admin") && User.getpassword (). Equals ("Admin")){             Map<string, object> session =Actioncontext.getcontext (). GetSession (); Session.put ("name", User.getusername ()); return "Success"; }Else{            return "Error"; }    }     PublicUserInfo GetUser () {returnuser; }     Public voidsetUser (UserInfo user) { This. user =user; }}

2. Inject the map object corresponding to the Servletapi object into the action

 Public classLoginaction implements Action,sessionaware {PrivateUserInfo user =NewUserInfo (); Private Map<string, object>map; @Override PublicString Execute () throws Exception {if(User.getusername (). Equals ("Admin") && User.getpassword (). Equals ("Admin") {map.put ("name", User.getusername ()); return "Success"; }Else{            return "Error"; }    }        //Sessionaware Implementation Method@Override Public voidSetsession (map<string, object>map) {         This. map=map; }         PublicUserInfo GetUser () {returnuser; }     Public voidsetUser (UserInfo user) { This. user =user; }     PublicMap<string, object>Getmap () {returnmap; }     Public voidSetmap (map<string, object>map) {         This. Map =map; }    }

The third type:

 Public classLoginaction implements Action,servletrequestaware {PrivateUserInfo user =NewUserInfo (); PrivateHttpServletRequest request; @Override PublicString Execute () throws Exception {if(User.getusername (). Equals ("Admin") && User.getpassword (). Equals ("Admin") {Request.setattribute ("name", User.getusername ()); return "Success"; }Else{            return "Error"; }    }        //Servletrequestaware Implementation Method@Override Public voidsetservletrequest (HttpServletRequest request) { This. request=request; }             Publichttpservletrequest getrequest () {returnrequest; }     Public voidsetrequest (HttpServletRequest request) { This. Request =request; }             PublicUserInfo GetUser () {returnuser; }     Public voidsetUser (UserInfo user) { This. user =user; }}

Coupling mode:

The first type:

 Public classLoginaction implements Action {PrivateUserInfo user =NewUserInfo (); @Override PublicString Execute () throws Exception {if(User.getusername (). Equals ("Admin") && User.getpassword (). Equals ("Admin") {HttpSession session=servletactioncontext.getrequest (). GetSession (); Session.setattribute ("name", User.getusername ()); return "Success"; }Else{            return "Error"; }    }     PublicUserInfo GetUser () {returnuser; }     Public voidsetUser (UserInfo user) { This. user =user; }  }

The second type:

 Public classLoginaction implements Action {PrivateUserInfo user =NewUserInfo (); @Override PublicString Execute () throws Exception {if(User.getusername (). Equals ("Admin") && User.getpassword (). Equals ("Admin") ) {Map<string, object> session =Servletactioncontext.getcontext (). GetSession (); Session.put ("name", User.getusername ()); return "Success"; }Else{            return "Error"; }    }     PublicUserInfo GetUser () {returnuser; }     Public voidsetUser (UserInfo user) { This. user =user; }    }

Struts 2--struts 2 access to SERVLETAPI objects