流程

请求-处理-响应

struts

1.导价包
2.设置过滤器

<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

3.构建action类继承ActionSupport

4.设置struts.xml文件

<package name="default" namespace="/" extends="struts-default">
    <action name="hello" class="com.action.UserAction" method="execute">       <!--action为地址和action的关系 --> 
       <result name="success">welcome.jsp</result> 
       <!--result是返回的结果 --> 
       </action> 
        
    </package>

默认

<action class="com.opensymphony.xwork2.ActionSupport" method="execute">
    <result name="success" type="dispatcher"></result>

</action>

Action接收参数的三种方式

作用：收集数据;
(1)属性方式 对属性进行封装 username

private String username;

    public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

(2)javaBean方式 对实体类进行封装 user.username

    private User user=new User();

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

(2)ModelDriven方式 实现接口 username

@Override
    public User getModel() {
        
        return user;
    }

(4)action上下文：ServletActionContext

HttpServletRequest request = ServletActionContext.getRequest();
        String ename = request.getParameter("ename");