Struts2实现与Servlet API的交互

struts2中提供了Map类型的request,session,与application,可以从ActionContext对象中获得.

(1)实例ActionContext,通常通过ActionContext对象提供的getContext()方法获取

public static ActionContext getContext(),该方法是静态的,可以直接调用

ActionContext=ActionContext.getContext()

(2)获取Map类型的request

Map request=ActionContext.getContext().get("request");

(3)获取Map类型的session

Map request=ActionContext.getContext().getSession();

(4)获取Map类型的application

Map request=ActionContext.getContext().getApplication();

public class LoginAction {
	
	private String username;
	private String password;
	
	public String login(){
		return "login";
	}
	
	public String logined(){
		
		if(StringUtil.isNotEmpty(username)&&StringUtil.isNotEmpty(password)){
			ActionContext.getContext().getSession().put("username",username);
			return "loginSuccess";
		}else{
			return "error";
		}
	}
	
	//生成setter和getter
	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;
	}

	
}

 虽然在struts2中使用ActionContext来访问 Servlet API,但这种方法不能直接获得ServletAPI实例,为了再action中直接访问 Servlet API可以通过以下方法直接访问

(1)ServletContextAware:实现该接口的Action可以直接访问Web应用的ServletContext实例

(2)ServletRequestAware:实现该接口的Action可以直接访问Web应用的HttpServletRequest实例

(3)ServletResponseAware:实现该接口的Action可以直接访问Web应用的HttpServletResponse实例

public class LoginAction implements ServletResponseAware{
	
	private String username;
	private String password;
	private HttpServletResponse response;
	public String login(){
		return "login";
	}
	
	public String logined(){
		//记录一个网站访问次数
		ActionContext context=ActionContext.getContext();
		Integer count=(Integer)context.getApplication().get("count");
		if(count==null){
			count=1;
		}else{
			count+=1;
		}
		context.getApplication().put("count", count);
		if(StringUtil.isNotEmpty(username)&&StringUtil.isNotEmpty(password)){
			Cookie cookie=new Cookie("username", username);
			cookie.setMaxAge(60*60);
			response.addCookie(cookie);
			context.getSession().put("username",username);
			return "loginSuccess";
		}else{
			return "error";
		}
	}
	
	//生成setter和getter
	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;
	}

	@Override
	public void setServletResponse(HttpServletResponse response) {
		this.response=response;
	}

}

 除上述两种方法外,还可以通过ServletActionContext访问Servlet API

public class LoginAction{
	
	private String username;
	private String password;
	private HttpServletResponse response;
	public String login(){
		return "login";
	}
	
	public String logined(){
		//记录一个网站访问次数
		ActionContext context=ActionContext.getContext();
		Integer count=(Integer)context.getApplication().get("count");
		if(count==null){
			count=1;
		}else{
			count+=1;
		}
		context.getApplication().put("count", count);
		if(StringUtil.isNotEmpty(username)&&StringUtil.isNotEmpty(password)){
			Cookie cookie=new Cookie("username", username);
			cookie.setMaxAge(60*60);
			ServletActionContext.getResponse().addCookie(cookie);
			context.getSession().put("username",username);
			return "loginSuccess";
		}else{
			return "error";
		}
	}
	
	//生成setter和getter
	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;
	}

}