JavaWeb -- Struts2 模型驱动

1. 模型驱动

示例：

注册表单reg.jsp

用户显示list页面 userList.jsp
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。