Note @ Configuration of spring4.0 01/17 Update SLTechnology News&Howtos

Note @ Configuration of spring4.0

2025-01-17 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >

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The @ Configuration annotation serves the same purpose as spring-*.xml. @ Configuration is to completely cancel the xml configuration file and switch to annotations. A comparison will be made below:

The loading mode of beans

Loading method of spring-.xml: ClassPathXmlApplicationContext, FileSystemXmlApplicationContext, ContextLoaderListener (for WEB)

How to load pure annotations: AnnotationConfigApplicationContext, AnnotationConfigWebApplicationContext (for WEB)

@ Configuration and @ Bean

Xml configuration:

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 ()

Note configuration:

@ 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 ()

Half xml configuration and half annotations:

@ 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 }} ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext ("classpath:spring-application.xml"); Student student2 = context.getBean (Student.class); student2.getName (); student2.getAge (); @ Configuration and @ ComponentScan

Xml configuration:

@ Componentpublic 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 () + "]")

Note configuration:

@ 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 () + "]"); @ Configuration and @ PropertySource

Jdbc.properties:

Jdbc.url=jdbc:mysql://172.28.1.1:3306/testjdbc.username=testjdbc.password=123456jdbc.driverClassName=com.mysql.jdbc.Driverdruid.initialSize=10druid.minIdle=5druid.maxActive=20druid.maxWait=60000druid.poolPreparedStatements=truedruid.maxPoolPreparedStatementPerConnectionSize=33druid.timeBetweenEvictionRunsMillis=60000druid.minEvictableIdleTimeMillis=300000druid.validationQuery=select 1 from dualdruid.testWhileIdle=truedruid.testOnBorrow=falsedruid.testOnReturn=falsedruid.removeAbandoned=truedruid.removeAbandonedTimeout=1800druid.logAbandoned=truedruid.filters=stat,wall,slf4jdruid.logSlowSql=truedruid.loginUsername=testdruid.loginPassword=123456

Xml configuration:

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 () + "]")

Note configuration:

Spring-application.xml

Spring-data.xml

ClassPathXmlApplicationContext context8 = new ClassPathXmlApplicationContext ("classpath:spring-application.xml"); query (context8.getBean (DataSource.class))

Note configuration:

@ 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 and @ ImportResource@Configuration@ImportResource ("classpath:spring-data.xml") public class ImportResourceConfig {} AnnotationConfigApplicationContext context10 = new AnnotationConfigApplicationContext (); context10.register (ImportResourceConfig.class); context10.refresh () Query (context10.getBean (DataSource.class))

Reference: https://www.cnblogs.com/duanxz/p/7493276.html

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