如何写Action类？<span style="font-family: 宋体, Arial; background-c

<span style="font-family: 宋体, Arial; background-color: rgb(255, 255, 255);">1.如何写Action类？</span>

1）public String execute(){}

2) public String methodName(){}

3) extends ActionSupport

2.Action的方法，怎么样跟请求对应?

1）什么都不指定，默认调用Action的execute
2）在struts.xml action的method属性指定

<span style="color: rgb(102, 102, 102);"><?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<include file="struts-default.xml"></include>
	<package name="dd" extends="struts-default" namespace="/">
	<action name="login" class="com.xiaochuan.LoginAction" </span><span style="color:#ff0000;"><strong>method="login"</strong></span><span style="color:#666666;">>
	<result name="success">/welcome.jsp</result>
	<result name="fail">.index.jsp</result>
	</action>
	</package>
</struts>    </span>

3）在url中用！号指定 login!add.action (login为action名,add为action中的一个方法名)\

<span style="color:#666666;"><body>
  <form action="</span><span style="font-family: 宋体, Arial; font-size: 16px; line-height: 26px;"><strong><span style="color:#ff0000;">login!add.action </span></strong></span><span style="color:#666666;">" method="post">
  <input type="text" name="username"><br/>
  <input type="text" name="password"><br/>
  <input type="submit" name="reset"><br/>
  </form>
  </body></span>

4）用submit标签的method属性指定方法名称\

<span style="color:#666666;"><s:form action="login.action" method="post">
  <input type="text" name="username"><br/>
  <input type="text" name="password"><br/>
  <input type="submit" name="reset"><br/>
  <s:sumbit name="login" value="登录" </span><strong><span style="color:#ff0000;">method="login"</span></strong><span style="color:#666666;">></s:sumbit>
  <s:sumbit name="add" value="添加" method="add"></s:sumbit>
  </s:form></span>

（5）在action用，用通配符自己适配

<action name="user_*" class="com.xiaochuan.Login.Action" method="{1}" >
<result name="success">/welcom.jsp</result>
<result name="fail">/index.jsp</result>
</action>\

3.Action中怎么获取作用域通讯对象
1）IOC
Struts2 （Action对象）
HttpServletRequest （Tomcat）

步骤:实现接口SessionAware,重写setSession()方法,在login中调用session.put("key","value");

public class LoginAction extends ActionSupport implements SessionAware,
        ServletRequestAware {

    private String userName;
    private String password;
    private String message;

    private Map session = null;

    private HttpServletRequest request = null;
 /**
  * Action中如何获取作用域通讯对象 s1）IOC Struts2 （Action对象）
  * 步骤:实现接口SessionAware,重写setSession()方法,在login中调用session.put("key","value");
  * HttpServletRequest （Tomcat）
  * 实现接口ServletRequestAware接口,重写setServletRequest()方法 2）非IOC
  * 
  */

    public String login() {
        String result = "success";
        message = "登录成功";
        System.out.println(userName + " " + password);
        if (userName == null || userName.equals("")) {
            result = "fail";
            message = "登录失败";
        } else {
            // 获取session
            // 在session中放一个用户登陆成功标记
            session.put("LOGIN_FLAG", userName);
            // 非IOC
            Map s1 = ActionContext.getContext().getSession();
            HttpServletRequest req = ServletActionContext.getRequest();
        }
        return result;
    }

// 重写了SessionAware接口中的setSession方法
  
    public void setSession(Map<String, Object> arg0) {
        this.session = arg0;
    }

struts2将session用map为了：实现容器的解耦（测试时只需要在JUnit测试,只需要在Map中看有无值,否则需要在tomcat下测试）
2）非IOC

HttpServletRequest req = ServletActionContext.getRequest();