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>