7.10--SSH学习之Struts2 Action配置

在说struts2之前当然要先下载好其框架了，官网有推荐
压缩包含：
apps：使用struts开发的一些demo
src：一个示例
docs：文档
lib：jar包

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三种创建Action的方式

1. 创建普通类，编写execute()方法
2. 创建Action类，实现Action接口
3. 创建Action类，继承ActionSupport类
   
   示例一：

public class FirstAction {    public String execute()throws Exception{        System.out.println("in FirstAction method execute()");        return "success";    }}

示例二：

public class SecondAction implements Action {    @Override    public String execute() throws Exception {        // TODO Auto-generated method stub        System.out.println("in SecondAction method execute()");        return SUCCESS;    }}

示例三：

public class ThirdAction extends ActionSupport {    @Override    public String execute() throws Exception {        // TODO Auto-generated method stub        System.out.println("in ThirdAction method execute()");        return "success";    }}

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三种调用Action方法的方式

1. 调用execute()方法响应客户端请求
2. 动态方法调用
3. 调用指定名字的方法响应客户端请求， 一个Action 类可包含多个方法，最好是3-5个
   
   struts.xml

<!-- 动态方法盗用 -->    <constant name="struts.enable.DynamicMethodInvocation" value="true" />    <constant name="struts.devMode" value="true" />    <package name="default" namespace="/" extends="struts-default">        <!-- 第一种调用方式，execute()方法，如后面有method="",则不调用默认execute().而调用             method指定的方法              -->        <action name="first" class="com.su.web.action.FirstAction">            <result type="dispatcher" name="success">/success.jsp</result>        </action>        <action name="stu" class="com.su.web.action.StudentAction">            <result type="dispatcher" name="success">/success.jsp</result>        </action>        <!-- 第二种调用方式，动态调用      stu!addStudent,调用StudentAction类中的addStudent方法-->        <action name="addStu" class="com.su.web.action.StudentAction" method="addStudent">            <result type="dispatcher" name="success">/success.jsp</result>        </action>        <action name="updateStu" class="com.su.web.action.StudentAction" method="updateStudent">            <result type="dispatcher" name="success">/success.jsp</result>        </action>        <action name="deleteStu" class="com.su.web.action.StudentAction" method="deleteStudent">            <result type="dispatcher" name="success">/success.jsp</result>        </action>        <!-- 第三种调用方式，调用指定的方法 ，stu_addStudent,后面的{1}中为addStudent，也称为占位符调用-->        <action name="stu_*" class="com.su.web.action.StudentAction" method="{1}">            <result type="dispatcher" name="success">/success_{1}.jsp</result>        </action>        <!--             后缀有两个时，可往后加        <action name="stu_*_*" class="com.su.web.action.StudentAction" method="{1}_{2}">            <result type="dispatcher" name="success">/success_{1}_{2}.jsp</result>        </action>         -->

示例一：

 <form action="first" method="post">        <input type="submit" value="提交">    </form>

示例二：

<form action="stu!addStudent" method="post">        <input type="submit" value="提交">    </form>

示例三：

form action="stu_addStudent" method="post">        <input type="submit" value="提交">    </form>

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三种接收表单数据的方式

1. Action的普通属性传参
2. Action对象属性传参
3. ModekDriven传参（缺点是只能由一个实体）
   
   

示例一：

public class UserAction extends ActionSupport {    //普通属性传参        private String userName;        private String userPwd;        public String getUserName() {            return userName;        }        public void setUserName(String userName) {            this.userName = userName;        }        public String getUserPwd() {            return userPwd;        }        public void setUserPwd(String userPwd) {            this.userPwd = userPwd;        }        public String execute() throws Exception{            System.out.println("in execute!!!");            System.out.println(userName);            System.out.println(userPwd);            return "success";        }}

示例二：

public class UserTwoAction extends ActionSupport{    //对象属性传参        private User user;        public User getUser() {            return user;        }        public void setUser(User user) {            this.user = user;        }        public String execute() throws Exception{            System.out.println("in execute!!!");            System.out.println(user.getUserName());            System.out.println(user.getUserPwd());            ActionContext.getContext().put("message", "！！！密码或用户名错误！！！");            return "success";        }        public String userlogin() throws Exception{            System.out.println("in userlogin!!!");            System.out.println(user.getUserName());            System.out.println(user.getUserPwd());            if(user.getUserName().equals("susu") && user.getUserPwd().equals("1111")){                ActionContext.getContext().put("message", "！！！登录成功！！！");                return "success";            }            return "nextAction";        }}

示例三：

    //ModelDriven传参    private User user= new User();    public User getUser() {        return user;    }    public void setUser(User user) {        this.user = user;    }    //@Override    public User getModel() {        // TODO Auto-generated method stub        return user;    }    public String userlogin() throws Exception{        System.out.println("in userlogin!!!");        System.out.println(user.getUserName());        System.out.println(user.getUserPwd());        return "success";    }}

表单JSP页面

  <body>    <form action="user_userlogin" method="post">        <!-- 普通属性传参 -->        <!--  用户名：<input type="text" name="userName">        密&nbsp;&nbsp;码：<input type="password" name="userPwd">        <input type="submit" value="登录">-->        <!-- 对象属性传参，表单元素的名字就是：Action的属性名.Action属性的属性名 -->        <!--  用户名：<input type="text" name="user.userName">        密&nbsp;&nbsp;码：<input type="password" name="user.userPwd">        <input type="submit" value="登录">-->        用户名：<input type="text" name="userName">        密&nbsp;&nbsp;码：<input type="password" name="userPwd">        <input type="submit" value="登录">    </form>  </body>

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四种Action请求下一个资源的方法

1. dispatcher转发，Action To JSP
2. chain转发，Action To Action
3. redirect重定向，Action To JSP
4. redirectAction 重定向，Action To Action

PS:转发：在原JSP页面提交的用户名和密码之类的信息不丢失
    重定向:则丢失

示例一：

        <action name="userTwo" class="com.su.web.action.UserTwoAction" >            <result type="dispatcher" name="success">/indexRedict.jsp</result>        </action>

示例二：

        <action name="userTwo_*" class="com.su.web.action.UserTwoAction" method="{1}">            <result type="chain" name="nextAction">userTwo</result>            <result type="dispatcher" name="success">/success_user.jsp</result>        </action>

示例三：

        <action name="userTwo_*" class="com.su.web.action.UserTwoAction" method="{1}">            <result type="redirectAction" name="nextAction">userTwo</result>            <result type="redirect" name="success">/success_user.jsp</result>        </action>

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Author：su1573