JavaWeb -- Struts2 模型驱动

1. 模型驱动

示例：

注册表单reg.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"%>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

	<head>

		<title>reg.jsp</title>

	</head>

	<body>

		<s:actionerror/>

		<s:form namespace="/md" action="MdAction_reg" method="post" theme="xhtml" validate="true">

			<s:textfield name="name" label="UserName" />

			<s:textfield name="age" label="UserAge" />

			<s:submit />

		</s:form>

	</body>

</html>

用户显示list页面 userList.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"%>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

	<head>

		<title>reg.jsp</title>

	</head>

	<body>

	<table border="1">

		<tr>

			<td>id</td><td>name</td><td>age</td><td>edit</td>

		</tr>

		<s:iterator value="userList">

			<tr>

				<td><s:property value="id" /></td>

				<td><s:property value="name" /></td>

				<td><s:property value="age" /></td>

				<td>

					<a href='<s:url action="MdAction_edit" namespace="/md"><s:param name="uid" value="id" /></s:url>'>edit</a>

				</td>

			</tr>

		</s:iterator>

	</table>

	</body>

</html>

处理action，模型驱动需要实现ModelDriven 接口，实现Preparable 接口，在modelDriven拦截器之前先运行 prepare拦截器。

package cn.itcast.struts2.modeldriven;

import java.util.ArrayList;

import java.util.List;

import org.apache.struts2.ServletActionContext;

import org.apache.struts2.interceptor.validation.SkipValidation;

import cn.itcast.struts2.model.User;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.ModelDriven;

import com.opensymphony.xwork2.Preparable;

/**

 * MdAction:某型驱动

 */

public class MdAction extends ActionSupport implements ModelDriven<User>,Preparable {

	private static final long serialVersionUID = -6933309304624396640L;

	private String name;

	private Integer uid ;

	private User user = new User();

	private List<User> userList ;

	public String reg() {

		return "success";

	}

	@SkipValidation

	public String toRegView() {

		System.out.println("toRegView");

		return "regView";

	}

	/**

	 * 查询所有用户

	 */

	public String findAllUsers(){

		userList = new ArrayList<User>();

		User u = null ;

		for(int i= 0 ; i < 10 ; i ++){

			u = new User();

			u.setId(1 + i);

			u.setName("tom" + i);

			u.setAge(20 + i);

			userList.add(u);

		}

		return "userListView";

	}

	public String edit(){

		return "editView" ;

	}

	//

	public User getModel() {

		return user;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public List<User> getUserList() {

		return userList;

	}

	public void setUserList(List<User> userList) {

		this.userList = userList;

	}

	public Integer getUid() {

		return uid;

	}

	public void setUid(Integer uid) {

		this.uid = uid;

	}

	/**

	 * 该方法在getModel之前运行,在modelDriven拦截器之前先运行

	 */

	public void prepareDoEdit() throws Exception {

		//

		User u = new User();

		u.setId(uid);

		u.setName("jerry");

		u.setAge(30);

		user = u ;

	}

	public void prepare() throws Exception {

	}

}

struts配置文件md.xml，需要添加paramsPrepareParamsStack，在prepare之前填充参数。

<?xml version="1.0"?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"

    "http://struts.apache.org/dtds/struts-2.1.7.dtd">

<struts>

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

        <action name="MdAction_*" class="cn.itcast.struts2.modeldriven.MdAction" method="{1}">

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

            <result name="regView">/md/reg.jsp</result>

            <result name="editView">/md/edit.jsp</result>

            <result name="userListView">/md/userList.jsp</result>

            <interceptor-ref name="paramsPrepareParamsStack" />

        </action>

    </package>

</struts>

巴特西

JavaWeb -- Struts2 模型驱动

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