SSH-Seesion中存放數據

將數據信息放到Seesion中有三種方式'。通過實例，分別說明一下。現有登陸的類，在其方法中實現了，將用戶信息放到Session中。

方法一：通過ActionContext訪問Servlet API，此種方式沒有入侵性

package com.bjpowernode.struts2;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;

public class LoginAction implements Action  {
	public String username;
	public String password;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public String execute()throws Exception{
		if("admin".equals(username) && "admin".equals(password)){
			//將登陸信息設置到session中
			ActionContext.getContext().getSession().put("user",username);
			
			//採用如下方式訪問request對象
			//ActionContext.getContext().put(key,value);
			
			//採用如下方式訪問application對象
			//ActionContext.getContext().getApplication().put(key,value);
			
			//通過request.getParameter()取得數據
			//String username = ActionContext.getContext().getParameters().get("username");
			
			return SUCCESS;
		}else{
			
			return ERROR;
		}
	}
}

package com.bjpowernode.struts2;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;

public class MustLoginAction implements Action {

	public String execute() throws Exception {
                //從Session中讀取用戶信息
		//getSession()得到的是Map
		if(ActionContext.getContext().getSession().get("user")==null){
			//重定向到登錄頁面
			return LOGIN;
		}
		return SUCCESS;
	}

}

方法二：通過實現裝配接口，完成對Servlet API的訪問

package com.bjpowernode.struts2;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;

import com.opensymphony.xwork2.Action;

public class LoginAction implements Action,ServletRequestAware,ServletResponseAware  {
	public String username;
	public String password;
	
	private HttpServletRequest request;
	private HttpServletResponse response;
	
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public String execute()throws Exception{
		if("admin".equals(username) && "admin".equals(password)){
			request.getSession().setAttribute("user", username);
			return SUCCESS;
		}else{
			
			return ERROR;
		}
	}
	
	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
	}
	
	public void setServletResponse(HttpServletResponse response) {
		this.response = response;
	}
}

package com.bjpowernode.struts2;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.Action;

public class MustLoginAction implements Action,ServletRequestAware {

	private HttpServletRequest request;
	
	public String execute() throws Exception {
                //從Session中取得用戶信息
		if(request.getSession().getAttribute("user")==null){
			//重定向到登錄頁面
			return LOGIN;
		}
		return SUCCESS;
	}

	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
	}
}

方法三：

package com.bjpowernode.struts2;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.Action;

public class LoginAction implements Action  {
	public String username;
	public String password;
	
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public String execute()throws Exception{
		if("admin".equals(username) && "admin".equals(password)){
			ServletActionContext.getRequest().getSession().setAttribute("user", username);
			return SUCCESS;
		}else{
			
			return ERROR;
		}
	}
}

package com.bjpowernode.struts2;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.Action;

public class MustLoginAction implements Action {

	public String execute() throws Exception {
		if(ServletActionContext.getRequest().getSession().getAttribute("user")==null){
			//重定向到登錄頁面
			return LOGIN;
		}
		return SUCCESS;
	}
}