02 Struts2框架----学习笔记2(了解一下，已过时)

1.*号通配符优化struts.xml代码

创建一个UserAction的动作类

package action;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{

    //添加用户

    public String add(){

        return SUCCESS;

    }

    //删除用户

    public String delete(){

        return SUCCESS;

    }

    //更新用户

    public String update(){

        return SUCCESS;

    }

    //查找用户

    public String find(){

        return SUCCESS;

    }

}

Struts.xml文件配置

<!--第一种配置方式-->

    <!--<package name="p2" extends="struts-default">

        <action name="add" class="action.UserAction" method="add">

            <result name="success">/add.jsp</result>

        </action>

        <action name="delete" class="action.UserAction" method="delete">

            <result name="success">/delete.jsp</result>

        </action>

        <action name="find" class="action.UserAction" method="find">

            <result name="success">/find.jsp</result>

        </action>

        <action name="update" class="action.UserAction" method="update">

            <result name="success">/update.jsp</result>

        </action>

    </package>-->

    <!--采用通配符的方式-->

    <!-- 动作访问之通配符

           * ：这里是一个*-->

    <package name="p2" extends="struts-default">

        <action name="*" class="action.UserAction" method="{1}">

            <result name="success">/{1}.jsp</result>

        </action>

    </package>

2.Struts.xml配置文件中的result元素的type取值的四种类型

chain的配置实例：

<1>利用chain转发到同一个包下的不同action

<package name="p3" extends="struts-default">

        <action name="hello1" class="action.HelloAction" method="sayHello">

            <result name="success" type="chain">hello2</result>

        </action>

        <action name="hello2" class="action.HelloAction2" method="sayHello2">

            <result name="success">/hello2.jsp</result>

        </action>

    </package>

效果图：

<2>利用chain转发到不同包下的不同action

<package name="p3" extends="struts-default">

        <action name="hello1" class="action.HelloAction" method="sayHello">

            <result name="success" type="chain">hello3</result>

        </action>

        <action name="hello2" class="action.HelloAction2" method="sayHello2">

            <result name="success">/hello2.jsp</result>

        </action>

    </package>

    <package name="p4" extends="struts-default">

        <action name="hello3" class="action.HelloAction3" method="sayHello3">

            <result name="success">/hello3.jsp</result>

        </action>

    </package>

注意：若加上namespace属性,则struts.xml文件的配置应修改为：

<package name="p3" extends="struts-default" namespace="/n3">

        <action name="hello1" class="action.HelloAction" method="sayHello">

            <result name="success" type="chain">

                <param name="namespace">/n4</param>

                <param name="actionName">hello3</param>

            </result>

        </action>

        <action name="hello2" class="action.HelloAction2" method="sayHello2">

            <result name="success">/hello2.jsp</result>

        </action>

    </package>

    <package name="p4" extends="struts-default" namespace="/n4">

        <action name="hello3" class="action.HelloAction3" method="sayHello3">

            <result name="success">/hello3.jsp</result>

        </action>

    </package>

效果图：

3.动作类中的servlet api访问

通过ServletActionContext获取获取servlet 的api

package action;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class TestAction extends ActionSupport{

    public String test(){

        //获取servlet 的api方式

        //第一种方式：通过ServletActionContext

        //1.response

        HttpServletResponse response = ServletActionContext.getResponse();

        //2.request

        HttpServletRequest request = ServletActionContext.getRequest();

        //3.session

        HttpSession session =  request.getSession();

        //4.application【ServletContext】

        ServletContext application = ServletActionContext.getServletContext();

        //NONE不跳转，也就是不用找result标签

        return NONE;

    }

}

4.Action接收请求参数的方式

(1)通过request对象

　　　　　//获取请求参数

        //第一种方法：通过request对象

        HttpServletRequest request =  ServletActionContext.getRequest();

        String username = request.getParameter("username");

        String password = request.getParameter("password");

        System.out.println(username);

        System.out.println(password);

(2)第2种方式：通过属性的set注入

package action;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.xml.ws.RequestWrapper;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{

    private String username;

    private String password;

    public void setUsername(String username) {

        System.out.println("setUsername");

        this.username = username;

    }

    public void setPassword(String password) {

        System.out.println("setPassword");

        this.password = password;

    }

    public String login(){

        //获取请求参数

        /*//第一种方法：通过request对象

        HttpServletRequest request =  ServletActionContext.getRequest();

        String username = request.getParameter("username");

        String password = request.getParameter("password");*/

        System.out.println(username);

        System.out.println(password);

        //第二种方式：通过属性的set注入

        //NONE不跳转，也就是不用找result标签

        return NONE;

    }

}

(3)第3种方式:通过模型驱动(最常用)

创建一个model---->User

package model;

public class User {

    private String username;

    private String password;

    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;

    }

    @Override

    public String toString() {

        return "User [username=" + username + ", password=" + password + "]";

    }

}

动作类代码：

package action;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.xml.ws.RequestWrapper;

import com.opensymphony.xwork2.ModelDriven;

import model.User;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport implements ModelDriven<User> {

    private User user = new User();

    @Override

    public User getModel() {

        // TODO Auto-generated method stub

        return user;

    }

    public String login(){

        //获取请求参数

        /**

         * 第三种方式: 通过模型驱动【最常用】

         * 实现步骤：

         * 1.在action里实现一个模型驱动接口

         * 2.提供一个模型属性，并一定要赋值

         * 通过这种方式，在jsp页面中就不用写user.

         *

         * 这是模型驱动的原理是因为有个模型驱动的拦截器在处理

         * 这个类就com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor

         */

        System.out.println(user);

        //NONE不跳转，也就是不用找result标签

        return NONE;

    }

}

控制台输出：

巴特西

02 Struts2框架----学习笔记2(了解一下，已过时)

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