[Struts2]取得 request,session,application 的方式

原始碼下載： http://goo.gl/JucNB9

主要有四種方式：

第一種 取得 Map 類型的資料，使用 ActionContext.getContext().getXXX()
第二種 取得 Map 類型的資料，使用 xxxAware
第三種 取得HtteServletRequest，HttpSession,ServletContext類型
第四種 取得HtteServletRequest，HttpSession,ServletContext類型，使用 ServletRequestAware

第一種 取得 Map 類型的資料，使用 ActionContext.getContext().getXXX()

package test;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import java.util.Map;

/**
 * Created by Hsu on 2015/4/21.
 */
public class MethodOne extends ActionSupport {
    private Map request;
    private Map session;
    private Map application;

    public MethodOne(){
        request = (Map) ActionContext.getContext().get("request");
        session = ActionContext.getContext().getSession();
        application = ActionContext.getContext().getApplication();
    }

    @Override
    public String execute() throws Exception {
        request.put("request","Method 1: I'm request");
        session.put("session","Method 1: I'm session");
        application.put("application","Method 1: I'm application");
        return SUCCESS;
    }
}

第二種 取得 Map 類型的資料，使用 xxxAware

package test;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import java.util.Map;

/**
 * Created by Hsu on 2015/4/21.
 */
public class MethodTwo extends ActionSupport implements RequestAware, SessionAware, ApplicationAware {
    private Map request;
    private Map session;
    private Map application;

    @Override
    public String execute() throws Exception {
        request.put("request","Method 2: I'm request");
        session.put("session","Method 2: I'm session");
        application.put("application","Method 2: I'm application");
        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;
    }
}

第三種 取得HtteServletRequest，HttpSession,ServletContext類型

package test;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * Created by Hsu on 2015/4/21.
 */
public class MethodThree extends ActionSupport{
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;

    public MethodThree(){
        request = ServletActionContext.getRequest();
        session = request.getSession();
        application = session.getServletContext();
    }

    @Override
    public String execute() throws Exception {
        request.setAttribute("request","Method 3: I'm request");
        session.setAttribute("session","Method 3: I'm session");
        application.setAttribute("application","Method 3: I'm application");
        return SUCCESS;
    }
}

第四種 取得HtteServletRequest，HttpSession,ServletContext類型，使用 ServletRequestAware

package test;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.interceptor.ServletRequestAware;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * Created by Hsu on 2015/4/21.
 */
public class MethodFour extends ActionSupport implements ServletRequestAware {
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;

    @Override
    public String execute() throws Exception {
        request.setAttribute("request","Method 4: I'm request");
        session.setAttribute("session","Method 4: I'm session");
        application.setAttribute("application","Method 4: I'm application");
        return SUCCESS;
    }

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

執行結果：