動態結果集

動態結果集：一定不要忘了爲動態結果的保存值設置set get方法${r}

//index.jsp
動態結果 一定不要忘了爲動態結果的保存值設置set get方法
		<ol>
			<li>
				<a href="user/user?type=1">返回success</a>
			</li>
			<li>
				<a href="user/user?type=2">返回error</a>
			</li>
		</ol>

//struts.xml
<constant name="struts.devMode" value="true" />
    <package name="user" namespace="/user" extends="struts-default">

		<action name="user" class="com.bjsxt.struts2.user.action.UserAction">
			<result>${r}</result><!-- $表示用來從值棧中取值，${r}從值棧中取r的值 -->
		</action><!-- 瞭解可以用屬性保存結果，屬性結果可以動態決定，表達式${r}取值 -->
	</package>

//action
package com.bjsxt.struts2.user.action;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class UserAction extends ActionSupport {
	private int type;

	private String r;  //瞭解可以用屬性保存結果

	public String getR() {
		return r;
	}

	public void setR(String r) {
		this.r = r;
	}

	public int getType() {
		return type;
	}

	public void setType(int type) {
		this.type = type;
	}

	@Override
	public String execute() throws Exception { //屬性結果可以動態決定
		if (type == 1)
			r = "/user_add_success.jsp";
		else if (type == 2)
			r = "/user_add_error.jsp";
		return "success";
	}

}