使用Spring4 + Hibernate4进行MVC工程配置
最近由于工作需要，公司要求新项目要升级到spring4 + hibernate4。按照spring3 + hibernate3时代的配置，走到数据库访问层，由于抛弃了HibernateTemplate方式，只能直接使用Session。然而简单修改配置后，出现了getCurrentSession()报错的问题。网上查阅了好久，发现提出的解决方式都是不用getCurrentSession()，改用openSession()。博主就较劲了，既然不能用，为什么会提供这种方式，而如果使用MyEclipse最新版的话，自动生成的DAO里面也是用的getCurrentSession()方式，然后根据spring的文档，翻阅源码等方式，最终配置成了可以使用getCurrentSession()的配置方式。
以上都是废话。下面上配置文件。
首先web.xml。
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>security</display-name> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>WEB-INF/spring/applicationContext.xml</param-value> </context-param> <filter> <filter-name>charEncoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>charEncoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>appServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param><!-- 在这里，使用了不同的配置文件，即MVC方面，单独使用一个配置文件 --> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring/appServlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>appServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
进行MVC配置的appServlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans:beans xmlns="http://www.springframework.org/schema/mvc" xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:s="http://www.springframework.org/schema/security" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security.xsd"> <annotation-driven /> <!-- 对于静态资源，js、css、images等访问，全部映射到/resources/下的目录 --> <resources mapping="/js/**" location="/resources/js/" /> <resources mapping="/css/**" location="/resources/css/" /> <resources mapping="/images/**" location="/resources/images/" /> <resources mapping="/resources/**" location="/resources/" /> <!-- 配置展示页面为jsp，全部放在/WEB-INF/views/目录下 --> <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <beans:property name="prefix" value="/WEB-INF/views/" /> <beans:property name="suffix" value=".jsp" /> </beans:bean> <!-- 由于将spring content和spring MVC分配置文件设置，所以这里就只扫描MVC中controller所在的包 其他包的内容交给spring content来处理。 --> <context:component-scan base-package="org.nercita.security.controllers" /> </beans:beans>
进行content配置的applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:s="http://www.springframework.org/schema/security" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security.xsd"> <!-- 数据库连接的配置放到hibernate.cfg.xml中去了 --> <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <property name="configLocation" value="classpath:hibernate.cfg.xml" /> <!-- 配置sessionFactory扫描models包下的所有类。 --> <property name="packagesToScan" value="org.nercita.security.db.models" /> </bean> <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <!-- 将所有的get前缀和find前缀的查询，如果有事务则以当前事务提交，没有事务就以非事务方式提交查询 并且查询结果设定为只读 --> <tx:method name="get*" propagation="SUPPORTS" read-only="true" /> <tx:method name="find*" propagation="SUPPORTS" read-only="true" /> <!-- 除get和find前缀的方法外，全部按照事务方式提交查询，并且设置结果非只读 --> <tx:method name="*" propagation="REQUIRED" read-only="false" /> </tx:attributes> </tx:advice> <!-- 下面的dao访问切片设置进行事务管理和dao类前面的@Transactional注解是否全是必须添加未进行验证，稳妥起见就都加上了。 --> <aop:config expose-proxy="true"> <aop:advisor advice-ref="txAdvice" pointcut="execution(* org.nercita.security.db.daos..*(..))" /> </aop:config> <aop:aspectj-autoproxy proxy-target-class="true" /> <tx:annotation-driven /> <context:component-scan base-package="org.nercita.security" /> </beans>
数据库配置，hibernate.cfg.xml，此文件放在classpath中的根目录。
<?xml version='1.0' encoding='UTF-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <!-- Generated by MyEclipse Hibernate Tools. --> <hibernate-configuration> <session-factory> <property name="connection.url">jdbc:mysql://192.168.9.53:3306/test_security?useUnicode=true&characterEncoding=utf-8</property> <property name="connection.username">root</property> <property name="connection.password">root</property> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property> <property name="c3p0.min_size">1</property> <property name="c3p0.max_size">5</property> <property name="c3p0.timeout">5000</property> <!-- 以上配置应该不用细说了，关键点就是使用是连接池，可以不用c3p0， 使用proxool之类的也行，只是一定要用连接池，否则hibernate会报错， 因为在applicationContext中没有配置数据源，spring会用默认的javax.sql.DataSource作为数据源，此数据源不支持事务，所以会抛出 异常Cannot unwrap to requested type [javax.sql.DataSource] --> </session-factory> </hibernate-configuration>
DAO的访问类
package org.nercita.security.db.daos;
import java.util.List;
import org.hibernate.LockOptions;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import static org.hibernate.criterion.Example.create;
import org.nercita.security.db.models.Account;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
/* 此处要增加事务的注解，以便spring在执行到这里是，将session查询注入事务的管理。 */
@Transactional
@Repository
public class AccountDAO {
private static final Logger log = LoggerFactory.getLogger(AccountDAO.class);
private SessionFactory sessionFactory;
@Autowired
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
private Session getCurrentSession() {
return sessionFactory.getCurrentSession();
}
protected void initDao() {
// do nothing
}
public Account findById(java.lang.Integer id) {
log.debug("getting Account instance with id: " + id);
try {
//所有的查询均可以使用getCurrentSession()来进行。无需对session进行显式的open和close操作，spring的事务管理会自动的打开和关闭。
Account instance = (Account) getCurrentSession().get(Account.class, id);
return instance;
} catch (RuntimeException re) {
log.error("get failed", re);
throw re;
}
}
}
关于jar包的问题，博主使用的maven，以下是引入的内容
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>4.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>4.3.5.Final</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-c3p0</artifactId> <version>4.3.5.Final</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.9</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.34</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.6.10</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.4</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>4.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>4.1.3.RELEASE</version> </dependency>