Access web elements in sessionapplicationStruts2
6923 단어 application
Get the reference of Map type request, session, application, real type HttpServletRequest, HttpSession, ServletContext:
The first three: depend on the container
The first three: IOC (only this one)
The last three: depend on the container
The last three: IOC
1. Method 1: ActionContext method
Generally, it is obtained in the constructor of the Action class, or the execute() method.
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;
}
}<body>
User Login Success!
<br />
<s:property value="#request.r1"/> | <%=request.getAttribute("r1") %> <br />
<s:property value="#session.s1"/> | <%=session.getAttribute("s1") %> <br />
<s:property value="#application.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 />
</body>So need to apply #key to access objects.
The latter is the access method of the java script code.
1. Method 2: Ioc (Inversion of Control) - Recommended Application
Let the Action class implement the RequestAware, SessionAware, and ApplicationAware interfaces, and then rewrite their set methods (setRequest, setSession, setApplication) through dependency injection and inversion of control (originally controlled by themselves, and now others control the value.)
Every day
I can't remember how many nights it slipped between my fingers flipping through the papers; I can't remember how many candles turned to ashes under my gaze. The deceased is like this, I always hear the remnants of my commitment to life, and feel that the passage of time is gradually diluting my youth and ignorance. I wish I was a clock that was wound up, running around day and night. Leave every moment that you have full of yourself.
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware, ApplicationAware {
private Map<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> session) {
this.session = session;
}
@Override
public void setApplication(Map<String, Object> application) {
this.application = application;
}
}1. Method 3: Get the original type
Get yes HttpServletRequest/HttpSession/ServletContext
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;
}
}First, Action needs to implement the org.apache.struts2.interceptor.ServletRequestAware interface, then rewrite the setServletRequest() method to obtain the HttpServletRequest object, and then obtain the HttpSession and ServletContext objects through the HttpServletRequest object.
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();
}
}--------------------------------- Original article By session and application------------ ----------------------
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