如何在JSP上寫入Action.java裡面的List?

java javascript hibernate struts2 jsp

chousen 2017-03-14 15:50:32 ‧ 9269 瀏覽

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各位先進好，
在網路上找了很多資料還是沒辦法確定目前的寫法是否正確，
所以想請各位指點需要改進的地方，謝謝!
以下是DAO的LIST:

public  List<MessageValue> getAll() throws Exception {	
	List<MessageValue> list  = new ArrayList<>();
    SessionFactory sf = HibernateUtil.getSessionFactory();
    try (Session session = sf.openSession();) {
      session.beginTransaction();      
      list=session.createCriteria(MessageValue.class).list();
         return list;        
    } catch (Exception ex) {
        Logger.getLogger(MessageDAO.class.getName()).log(Level.SEVERE,
                "新增資料失敗 !", ex);
        throw new Exception("新增資料失敗!", ex);
    }
}

以下是Action.java:

public class MessageAction {

	Collection<MessageValue> list = null;
	private MessageValue mv = new MessageValue();
	// private List<MessageValue> messageValue;
	private List<MessageValue> messageList ;
	static final Logger logger = LogManager.getLogger(MessageAction.class);

	public String add() throws Exception {
		logger.debug("SEEEEEEEE");

		System.out.println(getId());
		logger.info(mv.getId());
		logger.debug(mv.getSubject());
		logger.error(mv.getMessage());
		logger.warn(mv.getCreateowner());

		MessageDAO msdao = new MessageDAO();
		messageList = msdao.getAll();

		msdao.insert(mv); 
		getAll();
		return "success";
	}

	public String update() throws Exception {
		logger.debug("WATCHHHHHHHH");

		System.out.println(getId());
		logger.info(mv.getId());
		logger.debug(mv.getSubject());
		logger.error(mv.getMessage());
		logger.warn(mv.getCreateowner());
		MessageDAO msdao = new MessageDAO();
		msdao.update(mv); 
		getAll();
		return "success";
	}

	public String delete() throws Exception {

		System.out.println(getId());
		logger.info(mv.getId());
		logger.debug(mv.getSubject());
		logger.error(mv.getMessage());
		logger.warn(mv.getCreateowner());
		MessageDAO msdao = new MessageDAO();
		msdao.delete(mv); 
		getAll();
		return "success";
	}

	public List<MessageValue> getMessageList() {
		return messageList;
	}

	public void setMessageList(List<MessageValue> messageList) {
		this.messageList = messageList;
	}

	public Collection<MessageValue> getAll() throws Exception {
				
		MessageDAO dao= new MessageDAO();		
		list = dao.getAll();
		return dao.getAll();
	}

	// Function that handles the form submit
	public String updateMessageValue() {

		for (MessageValue mv : messageList) {
			System.out.println(mv.getId());
		}
		return "messageList";
	}
    下面就是其他getter & setter

這是我的JSP:

<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css">
<title>Hello World</title>
</head>
<body> 
	<%
		MessageDAO dao= new MessageDAO();
	Collection<MessageValue> list = null;
	list = dao.getAll();
	%>	
	<script>

		function update(formName) {	
			//var messageId = document.getElementById("").innerHTML;
			var v=document.getElementById(formName);			
			v.action = "message_update";  
			v.submit();			
		}
		function clearMsg(formName) {
			var v=document.getElementById(formName);
			v.action = "message_delete";
			v.submit();
		}
	</script>	
	<%
		if (list != null && list.size() > 0) {
	%>
	<%
		for (MessageValue mv : list) {
	%>
	<form id="<%=mv.getId()%>">
		<table>
			<tr>
				<td id="messageId<%= mv.getId()%>" name="id<%= mv.getId()%>">ID</td>
				<td>
				<input name="id" value="<%=mv.getId() == 0 ? "" : mv.getId()%>" /></td>
			<tr>
			<tr>
				<td>CreateOwner</td>
				<td><input name="createowner"
					value="<%=mv.getCreateowner() == null ? "" : mv.getCreateowner()%>" /></td>
			</tr>
			<tr>
				<td>Subject</td>
				<td><input name="subject"
					value="<%=mv.getSubject() == null ? "" : mv.getSubject()%>" /></td>
			</tr>
			<tr>
				<td>Message</td>
				<td><input name="message"
					value="<%=mv.getMessage() == null ? "" : mv.getMessage()%>" /></td>
			</tr>
		</table>
	</form>
	<button type="submit" onclick="update('<%= mv.getId()%>')">修改留言</button>
	<button type="submit" onclick="clearMsg('<%= mv.getId()%>')">刪除留言</button>
	<%
		}}
	%>		
</body>
</html>

我知道JSP上不要寫程式碼比較好，所以我想把JSP上面的
<% MessageDAO dao= new MessageDAO(); Collection<MessageValue> list = null; list = dao.getAll(); %>
移到Action.java，但不知道我目前寫在裡面的List是否正確?
以及要怎麼在JSP上面把LIST的資料帶進去給我的欄位資料使用??