Struts2 入門(一)

struts２ 環境配置有空再寫，先來記錄一下實務coding 的部份
這邊是單純的query及insert，使用hibernate來操作DB 的部份。


一、 Java (Action的部份)

package com.blog;

import com.hibernate.hibernateUtil;
import com.opensymphony.xwork2.ActionContext;
import java.util.Map;
import org.hibernate.Session;
import org.hibernate.Transaction;
import orm.User;
import com.opensymphony.xwork2.ActionSupport;
import java.util.List;
import org.hibernate.Query;

public class blogAction extends ActionSupport {

public String execute() throws Exception {


init();

if (this.action != null && this.action.equals("a")) {

if (this.username != null && this.username != "") {
System.out.println("Ready to do save users");
this.SaveUsers();
}

} else if (this.action != null && this.action.equals("q")) {

System.out.println("Ready to do query users");
queryUser();
}


return "blog_add";
}

//初始化
private void init(){
session = ActionContext.getContext().getSession();
session.clear();
}

// Save Data To Pojo
private void SaveUsers() {

User user = new User();
user.setName(this.username);
user.setAge(age);

Session session = hibernateUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
session.save(user);
tx.commit();
session.close();

}

//query Data
private void queryUser() {

Session s = hibernateUtil.getSessionFactory().openSession();
Query q = s.createQuery("from User");
List l = q.list();

//set session
//ActionContext.getContext().getSession().put("blog", l);
session.put("blog", l);

// Map s =getSession();
// s.put("blog", age);
// this.setSession(s);
// Map s = ActionContext.getContext().getSession();
// s.put("blogSession", l);


// for(java.util.Iterator it = l.iterator(); it.hasNext();){
// User user = (User)it.next();
//System.out.println("User:"+user.getName());
// System.out.println(it.next());

// }

s.close();

}
private String username;
private int age;
private String action;
private Map session;

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getAction() {
return action;
}

public void setAction(String action) {
this.action = action;
}
}

二、 JSP (View的部份)

<%--
Created on : 2008/9/8, 下午 02:33:31
Author : jimmy
--%>
< form action="blog.action" method="post">
< input type="text" name="username" value="" />

< input type="text" name="age" value="" />

< input type="hidden" name="action" value="a">
< input type="submit" value="Add" name="Add" />
< /form>

[session blog]
＜!--input type="submit" value="query" name="query" /-->

< %
if( s ession.getAttribute("blog")!=null){
java.util.List blog = (j ava.util.List)session.getAttribute("blog");
if(blog!=null){
for(int i = 0 ; i < blog.size();i++){
out.println("");
orm.User user = (orm.User) blog.get(i);
out.println(""+user.getId()+"");
out.println(""+user.getName()+"");
out.println(""+user.getAge()+"");
out.println(""+"");
out.println("");
} } }
%>
< /table>