STRUTS2 Series 10 4 Gets the three ways to use Request,session,application method and page display "Late OGNL is the fourth type"

Summarize

The first: through direct access

Request = (MAP) actioncontext.getcontext (). Get ("request");
Session = Actioncontext.getcontext (). GetSession ();
application = Actioncontext.getcontext (). Getapplication ();

The second implementation of the interface

Class LoginAction2 extends Actionsupport implements Requestaware,sessionaware, Applicationaware

The third type: by direct access

Request = Servletactioncontext.getrequest ();
Session = Request.getsession ();

Fourth: Through the implementation of interface

Class LoginAction4 extends Actionsupport implements Servletrequestaware

First type:

Package com.bjsxt.struts2.user.action;

Import Java.util.Map;

Import Com.opensymphony.xwork2.ActionContext;
Import Com.opensymphony.xwork2.ActionSupport;

public class LoginAction1 extends Actionsupport {
	
	private Map request;
	Private Map session;
	Private MAP Application;
	
	Public LoginAction1 () {
		request = (MAP) actioncontext.getcontext (). Get ("request");
		Session = Actioncontext.getcontext (). getsession ();
		application = Actioncontext.getcontext (). Getapplication ();
	
	Public String Execute () {
		request.put ("R1", "R1");
		Session.put ("S1", "S1");
		Application.put ("A1", "A1");
		Return SUCCESS 
	}
	
	
}

The second type:

Package com.bjsxt.struts2.user.action;

Import Java.util.Map;
Import Org.apache.struts2.interceptor.ApplicationAware;
Import Org.apache.struts2.interceptor.RequestAware;

Import Org.apache.struts2.interceptor.SessionAware;
Import Com.opensymphony.xwork2.ActionContext;

Import Com.opensymphony.xwork2.ActionSupport; public class LoginAction2 extends Actionsupport implements Requestaware,sessionaware, Applicationaware {private map&lt ;
	String, object> request;
	Private Map<string, object> session;
	
	Private map<string, object> application;
		DI Dependency Injection//IOC inverse of control public String execute () {request.put ("R1", "R1");
		Session.put ("S1", "S1");
		Application.put ("A1", "A1"); 
	return SUCCESS;
	@Override public void Setrequest (map<string, object> request) {this.request = Request;
	@Override public void Setsession (map<string, object> sessions) {this.session = session; @Override public void Setapplication (map<String, object> application) {this.application = Application;
 }
	
	
}

The third type:

Package com.bjsxt.struts2.user.action;

Import Javax.servlet.ServletContext;
Import Javax.servlet.http.HttpServletRequest;
Import javax.servlet.http.HttpSession;

Import Org.apache.struts2.ServletActionContext;

Import Com.opensymphony.xwork2.ActionSupport;

public class LoginAction3 extends Actionsupport {
	
	private httpservletrequest request;
	Private HttpSession session;
	Private ServletContext Application;
	
	Public LoginAction3 () {
		request = Servletactioncontext.getrequest ();
		Session = Request.getsession ();		application = Session.getservletcontext ();
	}
	
	Public String Execute () {
		request.setattribute ("R1", "R1");
		Session.setattribute ("S1", "S1");		application.setattribute ("A1", "A1");
		Return SUCCESS 
	}
	
}

The four:

Package com.bjsxt.struts2.user.action;

Import Javax.servlet.ServletContext;
Import Javax.servlet.http.HttpServletRequest;
Import javax.servlet.http.HttpSession;

Import Org.apache.struts2.interceptor.ServletRequestAware;

Import Com.opensymphony.xwork2.ActionSupport;

public class LoginAction4 extends Actionsupport implements Servletrequestaware {
	
	private httpservletrequest request ;
	Private HttpSession session;
	Private ServletContext Application;
	
	
	
	Public String Execute () {
		request.setattribute ("R1", "R1");
		Session.setattribute ("S1", "S1");		application.setattribute ("A1", "A1");
		return SUCCESS; 
	}

	@Override public
	void Setservletrequest (HttpServletRequest request) {
		this.request = Request;
		This.session = Request.getsession ();		this.application = Session.getservletcontext ();
							
	}
	
}

2

Login Page

<form name= "F" action= "method=" Post >
username: <input type= "text" name= "name"/>
Password: <input type= " Text "name=" password "/>
<br/> <input type="
button "value=" Submit1 "onclick=" javascript: document.f.action= ' login/login1 ';d ocument.f.submit (); "/>
<input type=" button "value=" Submit2 "onclick=" javascript:document.f.action= ' login/login2 ';d ocument.f.submit (); "/>
<input type=" button "value=" Submit3 "onclick=" javascript:document.f.action= ' login/login3 ';d ocument.f.submit (); "/> <input-type=
" Button "value=" SUBMIT4 "onclick=" javascript:document.f.action= ' Login/login4 ';d ocument.f.submit (); "/>
< /form>

3 Get the Worth page

In three ways.

A: #requestxxxx

B:request. GetAttribute (...)

C: Direct attribute value #attr.ri

<% @taglib uri= "/struts-tags" prefix= "s"%>

User Login success!
	<br/>
	<s:property value= "#request. R1"/> | <%=request.getattribute ("r1")%>
	<br <s:property value= "#session. S1"/> | <%=session.getattribute ("S1")%> <br/> <s:property
	"#application. value=" A1 |/> Application.getattribute ("A1")%> <br/> <s:property value= "
	#attr. A1"/><br/> <s
	: Property value= "#attr. S1"/><br/>
	<s:property value= "#attr. R1"/><br/>
	<s:debug ></s:debug>
	<br/>