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:

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

2. 点击提交

显示如下:

以上为实例截图.