@Configuration注解与spring-*.xml达到的目的是一样的。@Configuration是为了完全的取消xml配置文件而改用注解。下面将对其进行对比说明:
spring-.xml的加载方式:ClassPathXmlApplicationContext、FileSystemXmlApplicationContext、ContextLoaderListener(用于WEB);
纯注解的加载方式:AnnotationConfigApplicationContext、AnnotationConfigWebApplicationContext(用于WEB);
xml配置:
<?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-3.0.xsd"
default-lazy-init="true" default-autowire="default">
<bean id="student" class="com.demo.enity.Student"
init-method="init" destroy-method="destroy" lazy-init="false">
<property name="age" value="18"/>
<property name="name" value="test"/>
</bean>
</beans>
public class Student {
private Integer age;
private String name;
public void setAge(Integer age) {
this.age = age;
}
public Integer getAge() {
System.out.println("Age : " + age);
return age;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
System.out.println("Name : " + name);
return name;
}
public void printThrowException() {
System.out.println("Exception raised");
throw new IllegalArgumentException();
}
public void init(){
System.out.println("=============Student.init==============");
}
public void destroy(){
System.out.println("=============Student.destroy==============");
}
}
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-bean.xml");
Student student = context.getBean(Student.class);
student.getName();
student.getAge();
注解配置:
@Configuration
@Lazy
//@Profile("test")
public class BeanConfiguration {
@Bean(name = "student", initMethod = "init", destroyMethod = "destroy")
@Scope("prototype")
public Student student(){
Student student = new Student();
student.setAge(100);
student.setName("this is a test name.");
return student;
}
}
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
annotationConfigApplicationContext.register(BeanConfiguration.class);
annotationConfigApplicationContext.refresh();
Student student1 = annotationConfigApplicationContext.getBean(Student.class);
student1.getName();
student1.getAge();
半xml配置半注解:
@Configuration
@Lazy
//@Profile("test")
public class BeanConfiguration {
@Bean(name = "student", initMethod = "init", destroyMethod = "destroy")
@Scope("prototype")
public Student student(){
Student student = new Student();
student.setAge(100);
student.setName("this is a test name.");
return student;
}
}
<bean class="com.demo.configuration.BeanConfiguration"/>
<context:annotation-config/>
<!--或者-->
<context:component-scan base-package="com.demo"/>
<context:annotation-config/>
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-application.xml");
Student student2 = context.getBean(Student.class);
student2.getName();
student2.getAge();
xml配置:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.demo"/>
</beans>
@Component
public class Teacher {
private Integer age;
private String name;
private String id;
。。。
}
ClassPathXmlApplicationContext context4 =
new ClassPathXmlApplicationContext("classpath:spring-annotation-componentScan.xml");
Teacher teacher4 = context4.getBean(Teacher.class);
System.out.println("teacher4.hashCode = ["+teacher4.hashCode()+"]");
注解配置:
@Configuration
@ComponentScan("com.demo")
public class ComponentScanConfig {
}
AnnotationConfigApplicationContext context5 = new AnnotationConfigApplicationContext();
context5.register(ComponentScanConfig.class);
context5.refresh();
Teacher teacher5 = context5.getBean(Teacher.class);
System.out.println("teacher5.hashCode = ["+teacher5.hashCode()+"]");
jdbc.properties:
jdbc.url=jdbc:mysql://172.28.1.1:3306/test
jdbc.username=test
jdbc.password=123456
jdbc.driverClassName=com.mysql.jdbc.Driver
druid.initialSize=10
druid.minIdle=5
druid.maxActive=20
druid.maxWait=60000
druid.poolPreparedStatements=true
druid.maxPoolPreparedStatementPerConnectionSize=33
druid.timeBetweenEvictionRunsMillis=60000
druid.minEvictableIdleTimeMillis=300000
druid.validationQuery=select 1 from dual
druid.testWhileIdle=true
druid.testOnBorrow=false
druid.testOnReturn=false
druid.removeAbandoned=true
druid.removeAbandonedTimeout=1800
druid.logAbandoned=true
druid.filters=stat,wall,slf4j
druid.logSlowSql=true
druid.loginUsername=test
druid.loginPassword=123456
xml配置:
<?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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder ignore-unresolvable="true" location="jdbc.properties" />
<!-- 配置数据源 使用的是Druid数据源 -->
<bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<property name="url" value="${jdbc.url}" />
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!-- 初始化连接大小 -->
<property name="initialSize" value="${druid.initialSize}" />
<!-- 连接池最大使用连接数量 -->
<property name="maxActive" value="${druid.maxActive}" />
<!-- 连接池最小空闲 -->
<property name="minIdle" value="${druid.minIdle}" />
<!-- 获取连接最大等待时间 -->
<property name="maxWait" value="${druid.maxWait}" />
<property name="poolPreparedStatements" value="${druid.poolPreparedStatements}" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="${druid.maxPoolPreparedStatementPerConnectionSize}" />
<!-- 用来检测有效sql -->
<property name="validationQuery" value="${druid.validationQuery}" />
<property name="testOnBorrow" value="${druid.testOnBorrow}" />
<property name="testOnReturn" value="${druid.testOnReturn}" />
<property name="testWhileIdle" value="${druid.testWhileIdle}" />
<!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis" value="${druid.timeBetweenEvictionRunsMillis}" />
<!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="${druid.minEvictableIdleTimeMillis}" />
<!-- 打开removeAbandoned功能 -->
<property name="removeAbandoned" value="${druid.removeAbandoned}" />
<!-- 1800秒,也就是30分钟 -->
<property name="removeAbandonedTimeout" value="${druid.removeAbandonedTimeout}" />
<!-- 关闭abanded连接时输出错误日志 -->
<property name="logAbandoned" value="${druid.logAbandoned}" />
<!-- 监控数据库
<property name="filters" value="${druid.filters}" />
-->
</bean>
</beans>
ClassPathXmlApplicationContext context6 =
new ClassPathXmlApplicationContext("classpath:spring-data.xml");
DataSource dataSource = context6.getBean(DataSource.class);
DruidDataSource druidDataSource = (DruidDataSource) dataSource;
System.out.println("url = [" + druidDataSource.getUrl() + "]");
System.out.println("username = [" + druidDataSource.getUsername() + "]");
注解配置:
@Configuration
@PropertySource("classpath:jdbc.properties")
public class DruidJdbcConfig {
@Value("${jdbc.url}")
private String url;
@Value("${jdbc.username}")
private String username;
@Value("${jdbc.password}")
private String password;
@Value("${jdbc.driverClassName}")
private String driverClassName;
@Value("${druid.initialSize}")
private int initialSize;
@Value("${druid.minIdle}")
private int minIdle;
@Value("${druid.maxActive}")
private int maxActive;
@Value("${druid.maxWait}")
private int maxWait;
@Value("${druid.timeBetweenEvictionRunsMillis}")
private int timeBetweenEvictionRunsMillis;
@Value("${druid.minEvictableIdleTimeMillis}")
private int minEvictableIdleTimeMillis;
@Value("${druid.validationQuery}")
private String validationQuery;
@Value("${druid.testWhileIdle}")
private boolean testWhileIdle;
@Value("${druid.testOnBorrow}")
private boolean testOnBorrow;
@Value("${druid.testOnReturn}")
private boolean testOnReturn;
@Value("${druid.removeAbandoned}")
private boolean removeAbandoned;
@Value("${druid.removeAbandonedTimeout}")
private int removeAbandonedTimeout;
@Value("${druid.logAbandoned}")
private boolean logAbandoned;
@Value("${druid.filters}")
private String filters;
@Value("${druid.logSlowSql}")
private boolean logSlowSql;
@Value("${druid.loginUsername}")
private String loginUsername;
@Value("${druid.loginPassword}")
private String loginPassword;
}
AnnotationConfigApplicationContext context7 = new AnnotationConfigApplicationContext();
context7.register(DruidJdbcConfig.class);
context7.refresh();
DruidJdbcConfig druidJdbcConfig = context7.getBean(DruidJdbcConfig.class);
System.out.println("url = [" + druidJdbcConfig.getUrl() + "]");
System.out.println("username = [" + druidJdbcConfig.getUsername() + "]");
spring-application.xml
<?xml version = "1.0" encoding = "UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<import resource="spring-data.xml" />
</beans>
spring-data.xml
<?xml version = "1.0" encoding = "UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder ignore-unresolvable="true" location="jdbc.properties" />
<!-- 配置数据源 使用的是Druid数据源 -->
<bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource" >
<property name="url" value="${jdbc.url}" />
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!-- 初始化连接大小 -->
<property name="initialSize" value="${druid.initialSize}" />
<!-- 连接池最大使用连接数量 -->
<property name="maxActive" value="${druid.maxActive}" />
<!-- 连接池最小空闲 -->
<property name="minIdle" value="${druid.minIdle}" />
<!-- 获取连接最大等待时间 -->
<property name="maxWait" value="${druid.maxWait}" />
<property name="poolPreparedStatements" value="${druid.poolPreparedStatements}" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="${druid.maxPoolPreparedStatementPerConnectionSize}" />
<!-- 用来检测有效sql -->
<property name="validationQuery" value="${druid.validationQuery}" />
<property name="testOnBorrow" value="${druid.testOnBorrow}" />
<property name="testOnReturn" value="${druid.testOnReturn}" />
<property name="testWhileIdle" value="${druid.testWhileIdle}" />
<!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis" value="${druid.timeBetweenEvictionRunsMillis}" />
<!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="${druid.minEvictableIdleTimeMillis}" />
<!-- 打开removeAbandoned功能 -->
<property name="removeAbandoned" value="${druid.removeAbandoned}" />
<!-- 1800秒,也就是30分钟 -->
<property name="removeAbandonedTimeout" value="${druid.removeAbandonedTimeout}" />
<!-- 关闭abanded连接时输出错误日志 -->
<property name="logAbandoned" value="${druid.logAbandoned}" />
</bean>
</beans>
ClassPathXmlApplicationContext context8 =
new ClassPathXmlApplicationContext("classpath:spring-application.xml");
query(context8.getBean(DataSource.class));
注解配置:
@Configuration
@PropertySource("classpath:jdbc.properties")
public class DruidJdbcConfig {
@Value("${jdbc.url}")
private String url;
@Value("${jdbc.username}")
private String username;
@Value("${jdbc.password}")
private String password;
@Value("${jdbc.driverClassName}")
private String driverClassName;
@Value("${druid.initialSize}")
private int initialSize;
@Value("${druid.minIdle}")
private int minIdle;
@Value("${druid.maxActive}")
private int maxActive;
@Value("${druid.maxWait}")
private int maxWait;
@Value("${druid.timeBetweenEvictionRunsMillis}")
private int timeBetweenEvictionRunsMillis;
@Value("${druid.minEvictableIdleTimeMillis}")
private int minEvictableIdleTimeMillis;
@Value("${druid.validationQuery}")
private String validationQuery;
@Value("${druid.testWhileIdle}")
private boolean testWhileIdle;
@Value("${druid.testOnBorrow}")
private boolean testOnBorrow;
@Value("${druid.testOnReturn}")
private boolean testOnReturn;
@Value("${druid.removeAbandoned}")
private boolean removeAbandoned;
@Value("${druid.removeAbandonedTimeout}")
private int removeAbandonedTimeout;
@Value("${druid.logAbandoned}")
private boolean logAbandoned;
@Value("${druid.filters}")
private String filters;
@Value("${druid.logSlowSql}")
private boolean logSlowSql;
@Value("${druid.loginUsername}")
private String loginUsername;
@Value("${druid.loginPassword}")
private String loginPassword;
}
@Configuration
@Import(DruidJdbcConfig.class)
public class DruidPoolConfig {
private final static Logger LOGGER = LoggerFactory.getLogger(DruidPoolConfig.class);
@Autowired
private DruidJdbcConfig druidJdbcConfig;
@Bean
public DataSource dataSource(){
DruidDataSource datasource = new DruidDataSource();
datasource.setUrl(druidJdbcConfig.getUrl());
datasource.setUsername(druidJdbcConfig.getUsername());
datasource.setPassword(druidJdbcConfig.getPassword());
datasource.setDriverClassName(druidJdbcConfig.getDriverClassName());
datasource.setInitialSize(druidJdbcConfig.getInitialSize());
datasource.setMinIdle(druidJdbcConfig.getMinIdle());
datasource.setMaxActive(druidJdbcConfig.getMaxActive());
datasource.setMaxWait(druidJdbcConfig.getMaxWait());
datasource.setTimeBetweenEvictionRunsMillis(druidJdbcConfig.getTimeBetweenEvictionRunsMillis());
datasource.setMinEvictableIdleTimeMillis(druidJdbcConfig.getMinEvictableIdleTimeMillis());
datasource.setValidationQuery(druidJdbcConfig.getValidationQuery());
datasource.setTestWhileIdle(druidJdbcConfig.isTestWhileIdle());
datasource.setTestOnBorrow(druidJdbcConfig.isTestOnBorrow());
datasource.setTestOnReturn(druidJdbcConfig.isTestOnReturn());
datasource.setRemoveAbandoned(druidJdbcConfig.isRemoveAbandoned());
datasource.setRemoveAbandonedTimeout(druidJdbcConfig.getRemoveAbandonedTimeout());
datasource.setLogAbandoned(druidJdbcConfig.isLogAbandoned());
try {
datasource.setFilters(druidJdbcConfig.getFilters());
} catch (SQLException e) {
LOGGER.error("datasource.setFilters occur error.", e);
}
return datasource;
}
}
AnnotationConfigApplicationContext context9 = new AnnotationConfigApplicationContext();
context9.register(DruidPoolConfig.class);
context9.refresh();
query(context9.getBean(DataSource.class));
public static void query(DataSource dataSource) throws SQLException {
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
try {
connection = dataSource.getConnection();
connection.setAutoCommit(false);
String sql = "select id,`name`,mobile from t_agent_user where id = ?";
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setInt(1, 6497);
resultSet = preparedStatement.executeQuery();
while (resultSet.next()){
int id = resultSet.getInt("id");
String name = resultSet.getString("name");
String mobile = resultSet.getString("mobile");
System.out.println("id = [" + id + "]");
System.out.println("name = [" + name + "]");
System.out.println("mobile = [" + mobile + "]");
}
} catch (SQLException e) {
e.printStackTrace();
if (connection != null)
connection.rollback();
}finally {
if (connection != null){
connection.commit();
connection.setAutoCommit(true);
}
if (resultSet != null)
resultSet.close();
if (preparedStatement != null)
preparedStatement.close();
if (connection != null)
connection.close();
}
}
@Configuration
@ImportResource("classpath:spring-data.xml")
public class ImportResourceConfig {
}
AnnotationConfigApplicationContext context10 = new AnnotationConfigApplicationContext();
context10.register(ImportResourceConfig.class);
context10.refresh();
query(context10.getBean(DataSource.class));
参考:https://www.cnblogs.com/duanxz/p/7493276.html
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