Struts2 ModelDriven接口使用

时间：2023-03-09 17:05:48
Struts2 ModelDriven接口使用

用户在做http请求时一般都有两种方式:get和post方式.get方式用来获取查询相关信息,既向服务器获得信息,而post方式用来更新信息既向服务器提交数据.通常情况下,用get方式向服务器获取信息是附带的信息量都比较少,可以用servlet API来一个一个获取,但是当post方式提交数据时,往往数据量都比较大,如果用servlet API方式获取数据代码过于臃肿,维护和修改比较复杂降低了程序员工作效率.strtus2框架提供了ModelDrvem接口,对于实现接口Action来说只需定义Model,struts2框架就会自动将用户提交的http信息赋给相应的model.

以下已实例的方式说明,项目包括:action类LoginAction.java,model类PersonModel.java,struts.xml,web.xml文件,index.jsp,success.jsp文件.

1. 建立WEB工程  Struts2ModelDrivenDemo,添加相关的动态库和开发包,请参照前面介绍

2. 总体项目结构图如下:

Struts2 ModelDriven接口使用

3. 项目的代码介绍

Action类 LoginAction代码如下:

package com.northeasttycoon.action;

import com.northeasttycoon.model.PersonModel;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.ModelDriven;

/**

@author NorthEastTycoon

*/

public class LoginAction extends ActionSupport implements ModelDriven<PersonModel>{

	private static final long serialVersionUID = 1L;

	private PersonModel _personModel = new PersonModel();

	@Override

	public PersonModel getModel() {

		return _personModel;

	}

	public String execute() throws Exception{

		ActionContext _context = ActionContext.getContext();

		_context.put("person", _personModel);

		return SUCCESS;

	}

}

model类PersonModel.java

package com.northeasttycoon.model;

/**

@author NorthEastTycoon

*/

public class PersonModel {

	private String name;    // 名字

	private String degree;// 等级

	private String age;//年龄

	private String company;//公司

	private String address;//地址

	private String telephone;//电话

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public String getDegree() {

		return degree;

	}

	public void setDegree(String degree) {

		this.degree = degree;

	}

	public String getAge() {

		return age;

	}

	public void setAge(String age) {

		this.age = age;

	}

	public String getCompany() {

		return company;

	}

	public void setCompany(String company) {

		this.company = company;

	}

	public String getAddress() {

		return address;

	}

	public void setAddress(String address) {

		this.address = address;

	}

	public String getTelephone() {

		return telephone;

	}

	public void setTelephone(String telephone) {

		this.telephone = telephone;

	}

}

struts.xml

<?xml version="1.0" encoding="UTF-8"?><!-- northeasttycoon -->

<!DOCTYPE struts PUBLIC

   "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

   "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

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

      <action name="person"   class="com.northeasttycoon.action.LoginAction">

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

      </action>

   </package>

</struts>

web.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<!-- northeasttycoon -->

<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_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>Struts 2</display-name>

   <welcome-file-list>

      <welcome-file>index.jsp</welcome-file>

   </welcome-file-list>

   <filter>

      <filter-name>struts2</filter-name>

      <filter-class>

         org.apache.struts2.dispatcher.FilterDispatcher

      </filter-class>

   </filter>

   <filter-mapping>

      <filter-name>struts2</filter-name>

      <url-pattern>/*</url-pattern>

   </filter-mapping>

</web-app>

index.jsp

<%@ page contentType="text/html; charset=UTF-8"%>

<%@ taglib prefix="tycoon" uri="/struts-tags"%>

<html>

<head>

<title>Hello World</title>

</head>

<body>

<center>

 <tycoon:form action="person">

 	<tycoon:textfield lable="name" name="name"/>

 	<tycoon:textfield lable="degree" name="degree"/>

 	<tycoon:textfield lable="age" name="age"/>

 	<tycoon:textfield lable="company" name="company"/>

 	<tycoon:textfield lable="address" name="address"/>

 	<tycoon:textfield lable="telephone" name="telephone"/>

 	<tycoon:submit/>

 </tycoon:form>

</center>

</body>

</html>

success.jsp

<%@ page contentType="text/html; charset=UTF-8"%>

<%@ taglib prefix="tycoon" uri="/struts-tags"%>

<html>

<head>

<title>Hello World</title>

</head>

<body>

<center>

 <tycoon:property  value="#person.name"/></br>

<tycoon:property  value="#person.degree"/></br>

 <tycoon:property  value="#person.age"/></br>

<tycoon:property  value="#person.company"/></br>

<tycoon:property  value="#person.address"/></br>

<tycoon:property  value="#person.telephone"/></br>

</center>

</body>

</html>

执行的结果截图:

1. 浏览器输入:http://localhost:8080/Struts2ModelDrivenDemo 显示如下图

Struts2 ModelDriven接口使用

2. 点击提交

显示如下:

Struts2 ModelDriven接口使用

以上为实例截图.

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