struts2使用ServletAPI笔记

ServletAPI

在struts2的开发中，依然需要使用到servlet的api，比如：用户的登录后需要将用户信息保存到session中。在struts2中有两种方式可以获取servlet的api，一种是解耦方式，一种是耦合方式。

解耦方式

web.xml

<!-- struts2的前端控制器 -->
<filter>
	<filter-name>struts2</filter-name>
	<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
	<filter-name>struts2</filter-name>
	<url-pattern>*.action</url-pattern>
</filter-mapping>

配置文件

<struts>
	<package name="default" namespace="/" extends="struts-default">
		<action name="login" class="com.x.action.LoginAction" method="login">
			<result name="success">/success.jsp</result>
			<result name="login">/login.jsp</result>
		</action>
	</package>
</struts>

实体类

public class User {
	//保证有无参构造方法
	private String username;
	private 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;
	}
}

处理类

public class LoginAction implements ModelDriven<User>{
	private User user = new User();
	public User getModel() {
		return user;
	}
	
	public User getUser() {
		return user;
	}
	
	public void setUser(User user) {
		this.user = user;
	}
	//处理登录业务
	public String login() {
		if("zs".equals(user.getUsername()) && "111".equals(user.getPassword())) {
			//用户登录成功，将用户信息写入session
			ActionContext.getContext().getSession().put("currentuser", user);
			//获取application
			ActionContext.getContext().getApplication();
			//获取request
			Map<String, Object> req = (Map<String, Object>) ActionContext.getContext().get("request");
			req.put("pwd", user.getPassword());
			return "success";
		}else {
			return Action.LOGIN;
		}
	}
}

页面

<body>
	<form action="login.action" method="post">
		username:<input type="text" name="username"><br>
		password:<input type="password" name="password"><br>
		<input type="submit">
	</form>
</body>

<body>
登录成功，欢迎${sessionScope.currentuser.username }
</body>

耦合方式，通过servletapi

①直接通过ServletActionContext来获取

//处理登录业务
public String login() {
		if("zs".equals(user.getUsername()) && "111".equals(user.getPassword())) {
			//用户登录成功
			HttpServletRequest req = ServletActionContext.getRequest();
			req.getSession().setAttribute("currentuser", user);
			return "success";
		}else {
			return Action.LOGIN;
		}
}

②通过ActionContext对象获取HttpServletContext对象

//处理登录业务
public String login() {
	if("zs".equals(user.getUsername()) && "111".equals(user.getPassword())) {
		//用户登录成功
		HttpServletRequest req = (HttpServletRequest) ActionContext.getContext().get(StrutsStatics.HTTP_REQUEST);
		req.getSession().setAttribute("currentuser", user);
		return "success";
	}else {
		return Action.LOGIN;
	}
}

③通过IOC方式直接获取servletapi对象

实现接口ServletRequestAware获取request对象

public class LoginAction implements ModelDriven<User>,ServletRequestAware{
	private User user = new User();
	private HttpServletRequest req;
	//处理登录业务
	public String login() {
		if("zs".equals(user.getUsername()) && "111".equals(user.getPassword())) {
			//用户登录成功
			req.getSession().setAttribute("currentuser", user);
			return "success";
		}else {
			return Action.LOGIN;
		}
	}
	@Override
	//有IOC注入request对象
	public void setServletRequest(HttpServletRequest request) {
		this.req = request;
	}
	public User getModel() {
		return user;
	}
	public User getUser() {
		return user;
	}
	public void setUser(User user) {
		this.user = user;
	}
}

以上三种方式在本质上是一种，都是第二种。

来源：CSDN

作者：磊大大的编程之路

链接：https://blog.csdn.net/qq_42197800/article/details/104895986

标签

struts2

servlet