I、springboot基本概念
1.受管Bean
Spring中那些组成应用的主体以及由Spring IoC容器所管理的对象被称之为bean;
Bean就是由Spring容器初始化、装配以及被管理的对象
2.控制反转IOC和依赖注入DI
IoC实现由容器控制程序之间的关系，而非传统实现中，由程序代码直接操控，控制权由应用代码中转到了外部容器，控制权的转移，是所谓控制反转;
创建被调用者实例的工作通常由Spring容器来完成，然后注入调用者，因此也称为依赖注入
依赖注入：接口注入、设置注入、构造器注入
3.AOP面向切面编程
AOP即Aspect-Oriented Programming, 面向切面编程是一种新的方法论,是一种技术，不是设计模式，是对传统OOP(Object-Oriented Programming,面向对象编程)的补充
AOP 的主要编程对象是切面(aspect), 而切面模块化横切关注点
II、搭建简单的web服务器（SSH）
1.添加jar包
整合maven,在pom.xml中添加
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>1.5</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/webapp/WEB-INF/lib/ojdbc6.jar</systemPath>
</dependency>
</dependencies>2.整合Spring和web应用（在web.xml中添加）
<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:app*.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>
3.整合struts2（在web.xml中添加）
<filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class> <init-param> <param-name>struts.devMode</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
4.整合Hibernate
a.添加database.properties文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=root
b.配置连接池(在applicationContext.xml中添加)
<context:property-placeholder location="classpath:database.properties" />
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
p:driverClassName="${jdbc.driver}" p:url="${jdbc.url}" p:username="${jdbc.username}"
p:password="${jdbc.password}" destroy-method="close" />c.配置SessionFactory(在applicationContext.xml中添加)
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean" p:packagesToScan="com.yan.entity"(重点：使组件自动扫描特定的包以发现实体类的定义) p:dataSource-ref="dataSource"> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.format_sql">true</prop> <prop key="hibernate.hbm2ddl.auto">update</prop> <prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate5.SpringSessionContext (重点：使getCurrentSession不为null)</prop> </props> </property>
d.配置事务管理SessionFactory(在applicationContext.xml中添加)
<tx:annotation-driven />配置注解事务有效 <bean id="transactionManager" p:sessionFactory-ref="sessionFactory" class="org.springframework.orm.hibernate5.HibernateTransactionManager" />
5.定义带注解的实体类
在src/com/wcg/entity包下添加实体类
@Entity(name = "t_roles") //声明实体类，name是对应的表名称
@Cache(usage=CacheConcurrencyStrategy.READ_ONLY) //配置二级缓存的并发访问策略，read_only/read_write NONSTRICT_READ_WRITE TRANSACTIONAL
public class RoleBean implements Serializable {
private static final long serialVersionUID = -7132291370667604346L;
@Id //声明主键
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(length = 32, unique = true, nullable = false)//定义类说明,length字串长度unique唯一性约束，nullable非空约束
private String name;
@Basic(fetch = FetchType.LAZY)//针对属性的加载策略，需要支持
@Column(length = 200)
private String descn;
@OneToMany(mappedBy = "role", cascade = CascadeType.ALL)//说明一对多关联,mapedby表示由对方负责维护两者之间的关联关系，cascade级联策略
private Set<UserBean> users = new HashSet<>(); 6.定义DAO接口--IBaseDao
在src/com/wcg/dao包下添加DAO接口
public interface IBaseDao<T extends Serializable,ID extends Serializable> {
T save(T record);
T delete(T record);
T load(ID id);
T update(T record);
List<T> selectByExample(T record, int... pages);
int selectByExampleRowsNum(T record); //查询满足条件的一共有多少行
}
//--------------------------
public interface IRoleDao extends IBaseDao<RoleBean, Long> {
}
//--------------------------
public class BaseDaoImpl<T extends Serializable, ID extends Serializable> implements IBaseDao<T, ID> {
@Autowired
private SessionFactory sessionFactory;
private Class<T> recordClass;
@SuppressWarnings("unchecked")
public BaseDaoImpl() {
this.recordClass = (Class<T>) (((ParameterizedType) getClass().getGenericSuperclass())
.getActualTypeArguments()[0]);
}
protected Session getSession() {
return sessionFactory.getCurrentSession();
}
@Override
public T save(T record) {
this.getSession().save(record);
return record;
}
@Override
public T delete(T record) {
this.getSession().delete(record);
return record;
}
@Override
public T load(ID id) {
return this.getSession().get(recordClass, id);
}
@Override
public T update(T record) {
this.getSession().update(record);
return record;
}
@SuppressWarnings("unchecked")
@Override
public List<T> selectByExample(T record, int... pages) {
Criteria criteria = this.getSession().createCriteria(recordClass);
if(record != null)
criteria.add(Example.create(record));
if(pages != null && pages.length > 0)
criteria.setFirstResult(pages[0]);
if(pages != null && pages.length > 1)
criteria.setMaxResults(pages[1]);
return criteria.list();
}
//--------------------------
@Repository("roleDao")//声明DAO类型的受管bean，其中的value就是名称,类似于<bean>的id
public class RoleDaoImpl extends BaseDaoImpl<RoleBean, Long> implements IRoleDao {
}7.定义业务
在src/com/wcg/biz包下添加Server接口
public interface IRoleServ {
void create(RoleBean role);
}
//--------------------------
@Service //定义业务类型的受管bean，如果不定义名称，则默认名称就是类名称，首字母小写
@Transactional(readOnly = true, propagation = Propagation.SUPPORTS) //声明事务,readOnly只读事务propagation事务传播特性
public class RoleServImpl implements IRoleServ {
@Resource(name = "roleDao")
private IRoleDao roleDao;
@Transactional(readOnly = false, propagation = Propagation.REQUIRED)
public void create(RoleBean role) {
roleDao.save(role);
}8.定义Action
在src/com/wcg/action包下添加action类
@Controller //定义控制器类型的受管bean
@Scope("prototype") //定义scope=prototype以保证Action的多实例
@Namespace("/") //Struts2的注解，表示名空间
@ParentPackage("struts-default") //Struts2的注解，定义继承的包名称
public class UserAction extends ActionSupport implements ModelDriven<UserBean>, SessionAware {
private UserBean user = new UserBean();
private Map<String, Object> sessionAttribute;
@Autowired
private IUserServ userv;
@Action(value = "tologin", results = { @Result(name = "success", location = "/WEB-INF/content/user/login.jsp") })
public String toLogin() throws Exception {
return SUCCESS;
}
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