Struts2 Access WebElements

下面介绍4种访问request,session,application的方法:

第一种:依赖于容器

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.validator.annotations.Validations;

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();
		
	}

	@Override
	public String execute() throws Exception {
		
		request.put("r1", "r1_v");
		session.put("s1", "s1_v");
		session.put("s2", "s2_v");
		application.put("a1", "a1_v");
		
		return SUCCESS;
	}
	

	
	
	

}

 第二种:IOC （一般开发用这种较多）

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.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;
	
	@Override
	public String execute() throws Exception {
		request.put("r1", "r11");
		session.put("s1", "s11");
		application.put("a1", "a11");
		
		return SUCCESS;
	}

	@Override
	public void setRequest(Map<String, Object> arg0) {
		request = arg0;
		
	}

	@Override
	public void setSession(Map<String, Object> arg0) {
		session = arg0;
		
	}

	@Override
	public void setApplication(Map<String, Object> arg0) {
		application = arg0;
		
	}
	
	
	

}

 

第三种:依赖于容器(原始)

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();
	}

	@Override
	public String execute() throws Exception {
		request.setAttribute("r1", "r111");
		session.setAttribute("s1", "s111");
		application.setAttribute("a1", "a111");
		return SUCCESS;
	}
	
	
	
	
}

 第四种:也是IOC的

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;
	
	
	
	@Override
	public String execute() throws Exception {
		
		request.setAttribute("r1", "r1111");
		session.setAttribute("s1", "s1111");
		application.setAttribute("a1", "a1111");
		return SUCCESS; 
	}



	@Override
	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
		this.session =  request.getSession();
		this.application = session.getServletContext();
		
	}



	
	
	

}

 

访问:

<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.r1"/> 这种是自动搜索的,建议用上面那种精确的

 

<s:debug></s:debug>

 

对于为什么要用#来访问，你可以打开 <s:debug></s:debug>里面有说明:

Stack Context

These items are available using the #key notation