SSH框架整合
struts 控制用的
hibernate 操作数据库的
spring 用解耦的
Struts 、 spring 、 Hibernate 在各层的作用
1 ） struts 负责 web 层 .
ActionFormBean 接收网页中表单提交的数据，然后通过 Action 进行处理，再 Forward 到对应的网页。
在 struts-config.xml 中定义 <action-mapping>, ActionServlet 会加载。
2 ） spring 负责业务层管理，即 Service （或 Manager).
1 ． service 为 action 提供统计的调用接口，封装持久层的 DAO.
2 ．可以写一些自己的业务方法。
3 ．统一的 javabean 管理方法
4 ．声明式事务管理
5. 集成 Hiberante
3 ） Hiberante ，负责持久化层，完成数据库的 crud 操作
hibernate 为持久层，提供 OR/Mapping 。
它有一组 .hbm.xml 文件和 POJO, 是跟数据库中的表相对应的。然后定义 DAO ，这些是跟数据库打交道的类，它们会使用 PO 。
在 struts+spring+hibernate 的系统中，
对象的调用流程是： jsp-> Action － > Service ->DAO ->Hibernate 。
数据的流向是 ActionFormBean 接受用户的数据， Action 将数据从 ActionFromBean 中取出，封装成 VO 或 PO,
再调用业务层的 Bean 类，完成各种业务处理后再 forward 。而业务层 Bean 收到这个 PO 对象之后，会调用 DAO 接口方法，进行持久化操作。
spring:Aop管理事务控制,IoC管理各个组件的耦合,DaoTemplate作为常规持久层的快速开发模板!
struts:控制层Action,页面标签和Model数据,调用业务层
Hibernate:负责数据库和对象的映射,负责DAO层(Data Access Object:数据访问)
spring整合hibernate和struts，只要在配好了applicationContext.xml,在struts的action中直接调用就可以了。hibernate访问数据库的操作都在spring中实现了，spring的调用又在stuts的action中实现了。这个ssh框架就连到了一起……
一个简单的SSH例子
配置文件
/SSHLoginDemo/WebRoot/WEB-INF/struts-config.xml
代码
<?
xml version="1.0" encoding="UTF-8"
?>
<!
DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"
>
<
struts-config
>
<
data-sources
/>
<
form-beans
>
<
form-bean
name
="loginForm"
type
="com.qdu.sun.struts.form.LoginForm"
/>
</
form-beans
>
<
global-exceptions
/>
<
global-forwards
/>
<
action-mappings
>
<
action
attribute
="loginForm"
input
="/login.jsp"
name
="loginForm"
path
="/login"
scope
="request"
type
="org.springframework.web.struts.DelegatingActionProxy"
>
<
forward
name
="success"
path
="/success.jsp"
/>
<
forward
name
="fail"
path
="/fail.jsp"
/>
</
action
>
</
action-mappings
>
<
message-resources
parameter
="com.qdu.sun.struts.ApplicationResources"
/>
<
plug-in
className
="org.springframework.web.struts.ContextLoaderPlugIn"
>
<
set-property
property
="contextConfigLocation"
value
="/WEB-INF/classes/applicationContext.xml"
/>
</
plug-in
>
</
struts-config
>
/SSHLoginDemo/src/applicationContext.xml
代码
<?
xml version="1.0" encoding="UTF-8"
?>
<
beans
xmlns
="http://www.springframework.org/schema/beans"
xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation
="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"
>
<
bean
id
="login"
class
="com.qdu.sun.BO.LoginBO"
/>
<
bean
name
="/login"
class
="com.qdu.sun.struts.action.LoginAction"
>
<
property
name
="loginBean"
>
<
ref
bean
="login"
/>
</
property
>
</
bean
>
<
bean
id
="sessionFactory"
class
="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
>
<
property
name
="configLocation"
value
="classpath:hibernate.cfg.xml"
>
</
property
>
</
bean
>
<
bean
id
="UserDAO"
class
="com.qdu.sun.hibernate.UserDAO"
>
<
property
name
="sessionFactory"
>
<
ref
bean
="sessionFactory"
/>
</
property
>
</
bean
>
</
beans
>
前端页面
/SSHLoginDemo/WebRoot/login.jsp
代码
<%
@ page language
=
"
java
"
pageEncoding
=
"
ISO-8859-1
"
%>
<%
@ taglib uri
=
"
http://struts.apache.org/tags-bean
"
prefix
=
"
bean
"
%>
<%
@ taglib uri
=
"
http://struts.apache.org/tags-html
"
prefix
=
"
html
"
%>
<
html
>
<
head
>
<
title
>
JSP for LoginForm form
</
title
>
</
head
>
<
body
>
<
html:form
action
="/login"
>
password :
<
html:password
property
="password"
/><
html:errors
property
="password"
/><
br
/>
username :
<
html:text
property
="username"
/><
html:errors
property
="username"
/><
br
/>
<
html:submit
/><
html:cancel
/>
</
html:form
>
</
body
>
</
html
>
struts
/SSHLoginDemo/src/com/qdu/sun/struts/action/LoginAction.java
代码
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package
com.qdu.sun.struts.action;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
org.apache.struts.action.Action;
import
org.apache.struts.action.ActionForm;
import
org.apache.struts.action.ActionForward;
import
org.apache.struts.action.ActionMapping;
import
com.qdu.sun.BO.LoginBO;
import
com.qdu.sun.struts.form.LoginForm;
/**
* MyEclipse Struts
* Creation date: 08-26-2008
*
* XDoclet definition:
* @struts.action path="/login" name="loginForm" input="/login.jsp" scope="request" validate="true"
* @struts.action-forward name="success" path="welcome.jsp"
* @struts.action-forward name="fail" path="fail.jsp"
*/
public
class
LoginAction
extends
Action {
/*
* Generated Methods
*/
/**
* Method execute
*
@param
mapping
*
@param
form
*
@param
request
*
@param
response
*
@return
ActionForward
*/
private
LoginBO loginBean;
public
LoginBO getLoginBean() {
return
loginBean;
}
public
void
setLoginBean(LoginBO loginBean) {
this
.loginBean
=
loginBean;
}
public
ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
LoginForm loginForm
=
(LoginForm) form;
//
TODO Auto-generated method stub
LoginBO login
=
getLoginBean();
if
(login.validate(loginForm.getUsername(), loginForm.getPassword()))
{
request.setAttribute(
"
username
"
, loginForm.getUsername());
return
mapping.findForward(
"
success
"
);
}
else
return
mapping.findForward(
"
fail
"
);
}
}
/SSHLoginDemo/src/com/qdu/sun/struts/form/LoginForm.java
代码
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package
com.qdu.sun.struts.form;
import
javax.servlet.http.HttpServletRequest;
import
org.apache.struts.action.ActionErrors;
import
org.apache.struts.action.ActionForm;
import
org.apache.struts.action.ActionMapping;
import
org.apache.struts.action.ActionMessage;
/**
* MyEclipse Struts
* Creation date: 08-26-2008
*
* XDoclet definition:
* @struts.form name="loginForm"
*/
public
class
LoginForm
extends
ActionForm {
/*
* Generated fields
*/
/**
password property
*/
private
String password;
/**
username property
*/
private
String username;
/*
* Generated Methods
*/
/**
* Method validate
*
@param
mapping
*
@param
request
*
@return
ActionErrors
*/
public
ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {
//
TODO Auto-generated method stub
ActionErrors errors
=
new
ActionErrors();
if
(
this
.username
==
null
||
this
.username.length()
<
1
)
errors.add(
"
username
"
,
new
ActionMessage(
"
login.username
"
));
if
(
this
.password
==
null
||
this
.password.length()
<
1
)
errors.add(
"
password
"
,
new
ActionMessage(
"
login.password
"
));
return
errors;
}
/**
* Method reset
*
@param
mapping
*
@param
request
*/
public
void
reset(ActionMapping mapping, HttpServletRequest request) {
//
TODO Auto-generated method stub
this
.username
=
null
;
this
.password
=
null
;
}
/**
* Returns the password.
*
@return
String
*/
public
String getPassword() {
return
password;
}
/**
* Set the password.
*
@param
password The password to set
*/
public
void
setPassword(String password) {
this
.password
=
password;
}
/**
* Returns the username.
*
@return
String
*/
public
String getUsername() {
return
username;
}
/**
* Set the username.
*
@param
username The username to set
*/
public
void
setUsername(String username) {
this
.username
=
username;
}
}
spring
/SSHLoginDemo/src/com/qdu/sun/BO/LoginBO.java
代码
package
com.qdu.sun.BO;
import
java.util.List;
import
org.springframework.context.ApplicationContext;
import
org.springframework.context.support.ClassPathXmlApplicationContext;
import
com.qdu.sun.hibernate.User;
import
com.qdu.sun.hibernate.UserDAO;
public
class
LoginBO {
public
boolean
validate(String username, String password) {
ApplicationContext ctx
=
new
ClassPathXmlApplicationContext(
"
applicationContext.xml
"
);
UserDAO dao
=
(UserDAO) ctx.getBean(
"
UserDAO
"
);
User user
=
new
User();
user.setPassword(password);
user.setUsername(username);
List list
=
dao.findByExample(user);
if
(list.size()
>
0
) {
return
true
;
}
else
{
return
false
;
}
}
}
hibernate
/SSHLoginDemo/src/com/qdu/sun/hibernate/UserDAO.java
代码
package
com.qdu.sun.hibernate;
import
java.util.List;
import
org.apache.commons.logging.Log;
import
org.apache.commons.logging.LogFactory;
import
org.hibernate.LockMode;
import
org.springframework.context.ApplicationContext;
import
org.springframework.orm.hibernate3.support.HibernateDaoSupport;
/**
* A data access object (DAO) providing persistence and search support for User
* entities. Transaction control of the save(), update() and delete() operations
* can directly support Spring container-managed transactions or they can be
* augmented to handle user-managed Spring transactions. Each of these methods
* provides additional information for how to configure it for the desired type
* of transaction control.
*
*
@see
com.qdu.sun.hibernate.User
*
@author
MyEclipse Persistence Tools
*/
public
class
UserDAO
extends
HibernateDaoSupport {
private
static
final
Log log
=
LogFactory.getLog(UserDAO.
class
);
//
property constants
public
static
final
String USERNAME
=
"
username
"
;
public
static
final
String PASSWORD
=
"
password
"
;
protected
void
initDao() {
//
do nothing
}
public
void
save(User transientInstance) {
log.debug(
"
saving User instance
"
);
try
{
getHibernateTemplate().save(transientInstance);
log.debug(
"
save successful
"
);
}
catch
(RuntimeException re) {
log.error(
"
save failed
"
, re);
throw
re;
}
}
public
void
delete(User persistentInstance) {
log.debug(
"
deleting User instance
"
);
try
{
getHibernateTemplate().delete(persistentInstance);
log.debug(
"
delete successful
"
);
}
catch
(RuntimeException re) {
log.error(
"
delete failed
"
, re);
throw
re;
}
}
public
User findById(java.lang.Integer id) {
log.debug(
"
getting User instance with id:
"
+
id);
try
{
User instance
=
(User) getHibernateTemplate().get(
"
com.qdu.sun.hibernate.User
"
, id);
return
instance;
}
catch
(RuntimeException re) {
log.error(
"
get failed
"
, re);
throw
re;
}
}
public
List findByExample(User instance) {
log.debug(
"
finding User instance by example
"
);
try
{
List results
=
getHibernateTemplate().findByExample(instance);
log.debug(
"
find by example successful, result size:
"
+
results.size());
return
results;
}
catch
(RuntimeException re) {
log.error(
"
find by example failed
"
, re);
throw
re;
}
}
public
List findByProperty(String propertyName, Object value) {
log.debug(
"
finding User instance with property:
"
+
propertyName
+
"
, value:
"
+
value);
try
{
String queryString
=
"
from User as model where model.
"
+
propertyName
+
"
= ?
"
;
return
getHibernateTemplate().find(queryString, value);
}
catch
(RuntimeException re) {
log.error(
"
find by property name failed
"
, re);
throw
re;
}
}
public
List findByUsername(Object username) {
return
findByProperty(USERNAME, username);
}
public
List findByPassword(Object password) {
return
findByProperty(PASSWORD, password);
}
public
List findAll() {
log.debug(
"
finding all User instances
"
);
try
{
String queryString
=
"
from User
"
;
return
getHibernateTemplate().find(queryString);
}
catch
(RuntimeException re) {
log.error(
"
find all failed
"
, re);
throw
re;
}
}
public
User merge(User detachedInstance) {
log.debug(
"
merging User instance
"
);
try
{
User result
=
(User) getHibernateTemplate().merge(detachedInstance);
log.debug(
"
merge successful
"
);
return
result;
}
catch
(RuntimeException re) {
log.error(
"
merge failed
"
, re);
throw
re;
}
}
public
void
attachDirty(User instance) {
log.debug(
"
attaching dirty User instance
"
);
try
{
getHibernateTemplate().saveOrUpdate(instance);
log.debug(
"
attach successful
"
);
}
catch
(RuntimeException re) {
log.error(
"
attach failed
"
, re);
throw
re;
}
}
public
void
attachClean(User instance) {
log.debug(
"
attaching clean User instance
"
);
try
{
getHibernateTemplate().lock(instance, LockMode.NONE);
log.debug(
"
attach successful
"
);
}
catch
(RuntimeException re) {
log.error(
"
attach failed
"
, re);
throw
re;
}
}
public
static
UserDAO getFromApplicationContext(ApplicationContext ctx) {
return
(UserDAO) ctx.getBean(
"
UserDAO
"
);
}
}