????? 這是個用JSP+Hibernate編寫的非常簡單的留言系統例子，是個準三層結構（因為為了節省時間著重介紹hibernate部分，省去的service層，轉而使用jsp頁面進行業務處理，但并不是在jsp頁面上過多的編寫java代碼，而是使用專門的jsp作為業務處理層）?

開發工具：MyEclipse+Mysql

目錄結構如下：

config(配置類)

??? BeanConfig.java
??? MessageConfig.java

constants(常量類)

?? Constants.java

dao(數據訪問類)
??
??? hibernate
?????? ?MessageDAO.java
??????? UserDAO.java
??? IMessageDAO.java
? ? IUserDAO.java
???

exception(異常類)
??? MessageAuthorityException.java
??? MessageDAOException.java
??? MessageException.java

model(模型類)
??? Message.hbm.xml
????Message.java
??? User.hbm.xml
??? User.java

sql (數據庫腳本)
?? scrip.sql

util(工具類)
??? DaoFactory.java
??? HibernateDAO.java
??? HibernateFilter.java
??? HibernateUtil.java

?

BeanConfig.java

package ?cn.hxex.message.config;

import ?org.apache.commons.lang.builder.ReflectionToStringBuilder;

import ?cn.hxex.message.exception.MessageException;

public ? class ?BeanConfig?
... {
???? private ?String?id;
???? private ?String?type;

???? public ?String?getId()? ... {
???????? return ?id;
????}
???? public ? void ?setId(String?id)? ... {
???????? this .id? = ?id;
????}
????
???? public ?String?getType()? ... {
???????? return ?type;
????}
???? public ? void ?setType(String?type)? ... {
???????? this .type? = ?type;
????} ????
????
???? private ?Object?instance;
???? public ?Object?getInstance()?
???? ... {
???????? if (? null != instance?)? return ?instance;
????????
???????? try
???????? ... {
????????????Class?cls? = ?Class.forName(?getType()?);
????????????instance? = ?cls.newInstance();
???????????? return ?instance;
????????}
???????? catch (?Exception?ex?)
???????? ... {
???????????? throw ? new ?MessageException(? " Couldn't?find?class: " ? + ?getType()?);
????????}
????}
????
???? public ?String?toString()
???? ... {
???????? return ?ReflectionToStringBuilder.toString(? this ?);
????}
}

MessageConfig

package ?cn.hxex.message.config;

import ?java.util.Hashtable;

import ?org.apache.commons.lang.builder.ReflectionToStringBuilder;

import ?cn.hxex.message.exception.MessageException;

/**?*/ /**
?*?系統配置信息類
? */
public ? class ?MessageConfig
... {
???? public ? static ?Hashtable?beans;

???? /**?*/ /**
?????*?構造函數
????? */
???? public ?MessageConfig()
???? ... {
????????beans? = ? new ?Hashtable();
????}

???? /**?*/ /**
?????*?增加一個BeanConfig對象
?????*? @param ?bean
????? */
???? public ? void ?addBean(BeanConfig?bean)
???? ... {
????????beans.put(bean.getId(),?bean);
????}

???? /**?*/ /**
?????*?得到一個DAO接口對象的實例
?????*? @param ?name?DAO接口對象的名稱
?????*? @return ?指定DAO接口的實現類的實例
????? */
???? public ?Object?getBean(String?name)
???? ... {
????????BeanConfig?config? = ?(BeanConfig)?beans.get(name);

???????? if ?(config? == ? null )
???????? ... {
???????????? throw ? new ?MessageException( " Couldn't?find?the?bean:? " ? + ?name);
????????}

???????? return ?config.getInstance();
????}

???? public ?String?toString()
???? ... {
???????? return ?ReflectionToStringBuilder.toString( this );
????}
}

Constants

package ?cn.hxex.message.constants;

public ? class ?Constants? ... {
???? public ? static ? final ?String?SESSION_USER? = ? " cn.hxex.message.user " ;
}

?

IMessageDAO

package ?cn.hxex.message.dao;

import ?java.util.List;

import ?cn.hxex.message.model.Message;

public ? interface ?IMessageDAO?
... {
???? public ? void ?saveMessage(?Message?message?);
???? public ? void ?updateMessage(?Message?message?);
???? public ?List?getMessages(?);
???? public ? void ?deleteMessage(?String?id,?String?userId?);
???? public ?Message?getMessage(?String?id?);
}

IUserDAO

?

package ?cn.hxex.message.dao;

import ?cn.hxex.message.model.User;

public ? interface ?IUserDAO?
... {
???? public ? void ?saveUser(?User?user?);
???? public ?User?getUser(?String?username?);
???? public ?User?getUserById(?String?id?);
}

?

MessageDAO

package ?cn.hxex.message.dao.hibernate;

import ?java.util.List;

import ?cn.hxex.message.dao.IMessageDAO;
import ?cn.hxex.message.exception.MessageDAOException;
import ?cn.hxex.message.model.Message;
import ?cn.hxex.message.util.HibernateDAO;

/**?*/ /**
?*?IMessageDAO接口的Hibernate實現
? */
public ? class ?MessageDAO? extends ?HibernateDAO? implements ?IMessageDAO
... {

???? /**?*/ /**
?????*?保存留言信息
?????*?
?????*? @param ?message
?????*????????????被保存的留言對象
????? */
???? public ? void ?saveMessage(Message?message)
???? ... {
???????? super .saveObject(message);
????}

???? /**?*/ /**
?????*?得到所有的留言信息
?????*?
?????*? @return ?返回所有的

JSP+Hibernate入門級實例--留言系統