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.