struts2學習筆記1

struts框架可以提供對前端請求的封裝和重定向，提高開發效率，對程序代碼進行解耦

使用struts2的步驟.

 1首先引入struts2核心包，

2在web,xml中配置filter

<?xml version="1.0" encoding="UTF-8"?>
struts2org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilterstruts2/*index.jsp

<url-pattern>/*</url-pattern>表示攔截所有請求。

在src根目錄下添加strutsx.ml文件

<?xml version="1.0" encoding="UTF-8" ?>
  <!DOCTYPE struts PUBLIC
      "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
      "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
	<!-- 指定全局國際化資源文件 -->
	<constant name="struts.custom.i18n.resources" value="mess" />
	<!-- 指定全局字符集 -->
	<constant name="struts.i18n.encoding" value="utf-8"></constant>
	<!-- 創建package包，繼承struts 命名空間爲根路徑 -->
	<package name="struts2" namespace="/" extends="struts-default">
		<!-- 創建loginaction 使用actiong.LoginActiong文件 返回結果success 歡迎頁面 erro 錯誤頁面 input輸入頁面 -->
		<action name="login" class="action.LogionAction">
		
			<result name="error">/error.jsp</result>
			<result name="input">/login.jsp</result>
			<result name="success">/welcome.jsp</result>
		</action>
		<action name="sum" class="action.FirstAction">
			<result name="positive">/positive.jsp</result>
			<result name="negative">/negative.jsp</result>
		</action>
	</package>
	<!-- 引入其他struts配置文件 -->
	<include file="moresubmit.xml"></include>
	<include file="validate.xml"></include>
</struts>

3創建actiong/LoginAction文件。

package action;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletResponseAware;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;


public class LogionAction implements Action, ServletResponseAware{
	private static final String SUCCESS = "success";
	private static final String ERROR = "error";
	private String username;
	private String password;
	private String tip;
	private HttpServletResponse response;

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

	public String getTip() {
		return tip;
	}

	public void setTip(String tip) {
		this.tip = tip;
	}

	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;
	}

	public String execute() throws Exception {
		ActionContext ctx = ActionContext.getContext();
		Integer counter = (Integer) ctx.getApplication().get("counter");
		if (counter == null) {
			counter = 1;
		} else {
			counter += 1;
		}
		ctx.getApplication().put("counter", counter);
		ctx.getSession().put("user", getUsername());
		if (getUsername().equals("admin") && getPassword().equals("admin")) {
			Cookie c = new Cookie("user", getUsername());
			c.setMaxAge(60 * 60);
			ServletActionContext.getResponse().addCookie(c);
		//	response.addCookie(c);
			ctx.put("tip", "login success");
			return SUCCESS;
		} else {
			ctx.put("tip", "login failed");
			return ERROR;
		}

	}
}