4.0的一个重要特征就是完全支持Groovy,Groovy是spring主导的一门基于JVM的脚本语言(动态语言)。在spring 2.x,脚本语言通过 Java scripting engine在Spring中得到支持。而在4.0中,Groovy的变得更重要,Groovy可以替换xml和注解用来作为bean配置。
要使用Groovy,首先用maven下载Groovy的包,pom.xml文件中添加:
- <dependency>
- <groupId>org.codehaus.groovy</groupId>
- <artifactId>groovy-all</artifactId>
- <version>2.1.8</version>
- </dependency>
下面使用xml,java annotation,groovy dsl实现相同功能的不同配置方式比较
XML
- <jdbc:embedded-database id="dataSource" type="H2">
- </jdbc:embedded-database>
- <bean
- class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
- id="entityManagerFactory">
- <property name="persistenceUnitName" value="persistenceUnit" />
- <property name="dataSource" ref="dataSource" />
- <property name="persistenceProviderClass" value="org.hibernate.ejb.HibernatePersistence"></property>
- <property name="packagesToScan">
- <array>
- <value>com.hantsylabs.example.spring.model</value>
- </array>
- </property>
- <property name="jpaProperties">
- <value>
- hibernate.format_sql=true
- hibernate.show_sql=true
- hibernate.hbm2ddl.auto=create
- </value>
- </property>
- </bean>
- <bean class="org.springframework.orm.jpa.JpaTransactionManager"
- id="transactionManager">
- <property name="entityManagerFactory" ref="entityManagerFactory" />
- </bean>
Annotation
- @Configuration
- @ComponentScan(basePackages = { "com.hantsylabs.example.spring.dao","com.hantsylabs.example.spring.jpa" })
- @EnableTransactionManagement(mode=AdviceMode.ASPECTJ)
- public class JpaConfig {
- @Bean
- public DataSource dataSource() {
- return new EmbeddedDatabaseBuilder().setType(EmbeddedDatabaseType.H2).build();
- }
- @Bean
- public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
- LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
- emf.setDataSource(dataSource());
- emf.setPackagesToScan("com.hantsylabs.example.spring.model");
- emf.setPersistenceProvider(new HibernatePersistence());
- emf.setJpaProperties(jpaProperties());
- return emf;
- }
- private Properties jpaProperties() {
- Properties extraProperties = new Properties();
- extraProperties.put("hibernate.format_sql", "true");
- extraProperties.put("hibernate.show_sql", "true");
- extraProperties.put("hibernate.hbm2ddl.auto", "create");
- return extraProperties;
- }
- @Bean
- public PlatformTransactionManager transactionManager() {
- return new JpaTransactionManager(entityManagerFactory().getObject());
- }
- }
Groovy DSL
- import org.apache.commons.dbcp.BasicDataSource
- import org.springframework.orm.jpa.JpaTransactionManager
- import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean
- import com.hantsylabs.example.spring.jpa.JpaConferenceDaoImpl
- beans {
- dataSource(BasicDataSource) {
- driverClassName = "org.h2.Driver"
- url = "jdbc:h2:mem:spring4-sandbox"
- username = "sa"
- password = ""
- }
- entityManagerFactory(LocalContainerEntityManagerFactoryBean){
- persistenceProviderClass="org.hibernate.ejb.HibernatePersistence"
- dataSource=dataSource
- persistenceUnitName="persistenceUnit"
- packagesToScan=["com.hantsylabs.example.spring.model"]
- jpaProperties=[
- "hibernate.format_sql":"true",
- "hibernate.show_sql":"true",
- "hibernate.hbm2ddl.auto":"create"
- ]
- }
- transactionManager(JpaTransactionManager){
- entityManagerFactory=entityManagerFactory
- }
- conferenceDao(JpaConferenceDaoImpl){
- }
- }