Struts2学习（二） get/set 自动获取/设置数据，ActionSupport 类引入，Action 设置数据

根据上一讲中的源码继续

HelloWorldAction.java中private String name，自动获取/设置name：

package com.cy.action;

import com.opensymphony.xwork2.Action;

public class HelloWorldAction implements Action{
    
    private String name;
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String execute() throws Exception {
        System.out.println("执行了Action的默认方法");
        return SUCCESS;
    }

}

helloWorld.jsp:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    ${name }大爷你好！
</body>
</html>

1）使用get方式：

浏览器中访问：http://localhost:8080/Struts2Chap01/hello?name=Struts2

结果：

2）post方式：

编写index.jsp页面：

<body>
    <form action="hello" method="post">
        name: <input type="text" name="name"/>
        <input type="submit" value="submit" />
    </form>
</body>

浏览器中访问：http://localhost:8080/Struts2Chap01/index.jsp，输入name：

点击submit：

二、ActionSupport 类引入　　　（一般用ActionSupport，因为功能比Action多）　

HelloWorldAction2.java中继承ActionSupport：

package com.cy.action;

import com.opensymphony.xwork2.ActionSupport;

public class HelloWorldAction2 extends ActionSupport{
    
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    private String name;
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String execute() throws Exception {
        System.out.println("执行了HelloWorldAction2 Action的默认方法");
        return SUCCESS;
    }

}

三、Action 设置数据　　

第一种方式：属性驱动(FieldDriven) A、基本数据类型属性 B、JavaBean 类型属性
第二种方式：模型驱动(ModelDriven)

一般都用第一种方式，第二种方式在Action类中只能设置一个实体类的属性的值

基本数据类型属性实例分析

UserAction类

package com.java1234.action;

import com.java1234.model.User;
import com.java1234.service.UserService;
import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{

   /**
   *
   */
   private static final long serialVersionUID = 1L;

   private UserService userService=new UserService();

   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 execute() throws Exception {
       System.out.println("执行了UserAction的默认方法");
       User user=new User();

//userName和Password的值是通过post的方式提交过来的值，先通过set方法，然后通过get方法
       user.setUserName(userName);
       user.setPassword(password);
       if(userService.login(user)){
           return SUCCESS;
       }else{
           return ERROR;
       }
   }

}

UserService类

package com.java1234.service;

import com.java1234.model.User;

public class UserService {

   public boolean login(User user){
       if("java1234".equals(user.getUserName())&&"123456".equals(user.getPassword())){
           return true;
       }else{
           return false;
       }
   }
}

struts.xml

<?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>

<package name="helloWorld" extends="struts-default">
   <action name="hello" class="com.java1234.action.HelloWorldAction2">
       <result name="success">helloWorld.jsp</result>
   </action>

   <action name="user" class="com.java1234.action.UserAction">
       <result name="success">success.jsp</result>
       <result name="error">error.jsp</result>
   </action>

   <action name="user2" class="com.java1234.action.UserAction2">
       <result name="success">success.jsp</result>
       <result name="error">error.jsp</result>
   </action>

   <action name="user3" class="com.java1234.action.UserAction3">
       <result name="success">success.jsp</result>
       <result name="error">error.jsp</result>
   </action>

</package>

</struts>

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="user" method="post">
   用户名：<input type="text" name="userName"/>
   密码：<input type="text" name="password"/>
   <input type="submit" value="登录"/>
</form>
</body>
</html>

success.jsp

error.jsp

浏览器访问http://localhost:8080/Struts2Chap01/login.jsp，输入cy，123456

登录成功：

B：javaBean类型属性驱动：

将上面的UserAction中改为private User user；javaBean的方式：

package com.cy.action;

import com.cy.model.User;
import com.cy.service.UserService;
import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{
    
    private static final long serialVersionUID = 1L;
    private UserService userService = new UserService();
    private User user;
    
    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String execute() throws Exception {
        System.out.println("执行了UserAction Action的默认方法 采用javaBean");
        if(userService.login(user)){
            return SUCCESS;
        }else{
            return ERROR;
        }
        
    }

}

login2.jsp

<body>
    <form action="user" method="post">
        用户名: <input type="text" name="user.userName"/><br>
        密码: <input type="password" name="user.password"/><br>
        <input type="submit" value="登录" />
    </form>
</body>

第二种：模型驱动：

UserAction.java: //主要实现ModelDriven<User>， private User user = new User()，这里要new一个user:

package com.cy.action;

import com.cy.model.User;
import com.cy.service.UserService;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class UserAction extends ActionSupport implements ModelDriven<User>{
    
    private static final long serialVersionUID = 1L;
    private UserService userService = new UserService();
    private User user = new User();

    public String execute() throws Exception {
        System.out.println("执行了UserAction Action的默认方法 采用模型驱动");
        if(userService.login(user)){
            return SUCCESS;
        }else{
            return ERROR;
        }
    }

    public User getModel() {
        return user;
    }

}

login3.jsp:

<body>
    <form action="user" method="post">
        用户名: <input type="text" name="userName"/><br>
        密码: <input type="password" name="password"/><br>
        <input type="submit" value="登录" />
    </form>
</body>

ModelDriven的缺点是：只接受一个javaBean；

Struts2学习（二） get/set 自动获取/设置数据 ，ActionSupport 类引入，Action 设置数据

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Struts2学习（二） get/set 自动获取/设置数据，ActionSupport 类引入，Action 设置数据