Struts的数据封装(三种方式)_数据封装 struts-优快云博客

本文链接：https://blog.youkuaiyun.com/zhang__liuchen/article/details/88602553

本文深入探讨了Struts2框架中的数据封装方法，包括属性驱动和模型驱动两种主要方式，详细介绍了每种方式的实现原理及代码示例。

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demo1.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>Struts2的数据封装</h1>
<h3>方式一：属性驱动-提供set方法</h3>
<form action="${pageContext.request.contextPath }/userAction1.action" method="post">
	用户名：<input type="text" name="username"><br>
	密码：<input type="password" name="password"><br>
	年龄：<input type="text" name="age"><br>
	生日：<input type="text" name="birthday"><br>
	工资：<input type="text" name="salary"><br>
	<input type="submit" value="提交">
</form>

<h3>方式二：属性驱动-在页面提供表达式方式</h3>
<form action="${pageContext.request.contextPath }/userAction2.action" method="post">
	用户名：<input type="text" name="user.username"><br>
	密码：<input type="password" name="user.password"><br>
	年龄：<input type="text" name="user.age"><br>
	生日：<input type="text" name="user.birthday"><br>
	工资：<input type="text" name="user.salary"><br>
	<input type="submit" value="提交">
</form>

<h3>方式三：模型驱动-模型驱动的方式</h3>
<form action="${pageContext.request.contextPath }/userAction3.action" method="post">
	用户名：<input type="text" name="username"><br>
	密码：<input type="password" name="password"><br>
	年龄：<input type="text" name="age"><br>
	生日：<input type="text" name="birthday"><br>
	工资：<input type="text" name="salary"><br>
	<input type="submit" value="提交">
</form>
</body>
</html>

User.java

package com.cherry.struts2.domain;

import java.util.Date;

public class User {
	private String username;
	private String password;
	private Integer age;
	private Date birthday;
	private Double salary;
	
	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 Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public Double getSalary() {
		return salary;
	}
	public void setSalary(Double salary) {
		this.salary = salary;
	}
	@Override
	public String toString() {
		return "User [username=" + username + ", password=" + password + ", age=" + age + ", birthday=" + birthday
				+ ", salary=" + salary + "]";
	}
	
	
}

UserAction1.java

package com.cherry.struts2.demo2;

import java.util.Date;

import com.cherry.struts2.domain.User;
import com.opensymphony.xwork2.ActionSupport;
/**
 * 数据封装方式一：提供属性的set方法
 * @author zhang
 *
 */
public class UserAction1 extends ActionSupport {
	//提供了对应的属性
	private String username;
	private String password;
	private Integer age;
	private Date birthday;
	private Double salary;
	//提供属性对应的set方法
	

	public void setUsername(String username) {
		this.username = username;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public void setSalary(Double salary) {
		this.salary = salary;
	}
	
	@Override
	public String execute() throws Exception {
		//接收数据：
		System.out.println(username);
		System.out.println(password);
		System.out.println(age);
		System.out.println(birthday);
		System.out.println(salary);
		
		//封装数据
		User user=new User();
		user.setUsername(username);
		user.setPassword(password);
		user.setAge(age);
		user.setBirthday(birthday);
		user.setSalary(salary);
		return NONE;
	}
}

UserAction2.java

package com.cherry.struts2.demo2;

import com.cherry.struts2.domain.User;
import com.opensymphony.xwork2.ActionSupport;
/**
 * 数据封装的方式二：属性驱动-在页面提供表达式方式
 * @author zhang
 *
 */
public class UserAction2 extends ActionSupport {
	
	//提供一个User对象
	private User user;
	//提供user的set和get方法：一点要提供get方法
	//因为拦截器完成数据封装，需要创建User对象
	public User getUser() {
		return user;
	}


	public void setUser(User user) {
		this.user = user;
	}
	
	@Override
	public String execute() throws Exception {
		System.out.println(user);
		return NONE;
	}
}

UserAction3.java

package com.cherry.struts2.demo2;

import com.cherry.struts2.domain.User;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
/**
 * 数据封装的方式三：模型驱动
 * 缺点：只能封装到一个对象中
 * @author zhang
 *
 */
public class UserAction3 extends ActionSupport implements ModelDriven<User>{
	//模型驱动使用的对象：前提必须手动提供对象的实例
	private User user=new User();//手动实例化User
	@Override
	//模型驱动需要使用的方法：
	public User getModel() {
		return user;
	}
	
	@Override
	public String execute() throws Exception {
		System.out.println(user);
		return NONE;
	}

	
}

struts_demo2.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
	<package name="demo2" extends="struts-default" namespace="/">
	
		<action name="userAction1" class="com.cherry.struts2.demo2.UserAction1">
		</action>
		<action name="userAction2" class="com.cherry.struts2.demo2.UserAction2">
		</action>
		<action name="userAction3" class="com.cherry.struts2.demo2.UserAction3">
		</action>
	</package>
	
</struts>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
	<!-- 配置Struts2的常量 -->
	<constant name="struts.action.extendsion" value="action"></constant>
	
	<include file="com/cherry/struts2/demo2/struts_demo2.xml"></include>
</struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>struts2_day02</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <!-- 配置核心过滤器 -->
  <filter>
  		<filter-name>struts</filter-name>
  		<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  
  <filter-mapping>
  		<filter-name>struts</filter-name>
  		<url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>