java配置是spring4.x推荐的配置方式，可以完全替代xml配置。
1、注解 @Configuration 和 @Bean
spring的java配置方式是通过@Configuration和@Bean这两个注解来实现的。
@Configuration作用在类上，相当于一个xml配置文件；@Bean作用在方法上，相当于xml配置中的
UserServiceImpl
packagecom.oy.service.impl;importcom.oy.service.UserService;public class UserServiceImpl implementsUserService {
@Overridepublic voidgetUser(Integer id) {
System.out.println("id = " +id);
}
}
JavaConfig
packagecom.oy;importorg.springframework.context.annotation.Bean;importorg.springframework.ponentScan;importorg.springframework.context.annotation.Configuration;importcom.oy.service.UserService;importcom.oy.service.impl.UserServiceImpl;
@Configuration//通过该注解来表明该类是一个spring的配置类，相当与一个xml文件
//@ComponentScan(basePackages = {"com.oy.service.impl"}) //配置扫描包
public classJavaConfig {
@BeanpublicUserService userService() {return newUserServiceImpl();
}
}
TestDemo
public classTestDemo {public static voidmain(String[] args) {
AnnotationConfigApplicationContext context=
new AnnotationConfigApplicationContext(JavaConfig.class);
UserService userService= context.getBean(UserService.class);
userService.getUser(111);
context.close();
}
}
2、读取外部的配置文件
依赖
com.jolbox
bonecp-spring
0.8.0.RELEASE
数据库连接信息db.properties
db.url=jdbc:mysql://127.0.0.1:3306/security_test?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
db.driverClassName=com.mysql.jdbc.Driver
db.username=root
db.password=
DBConfig
packagecom.oy;importjavax.sql.DataSource;importorg.springframework.beans.factory.annotation.Value;importorg.springframework.context.annotation.Bean;importorg.springframework.context.annotation.Configuration;importorg.springframework.context.annotation.PropertySource;importcom.jolbox.bonecp.BoneCPDataSource;
@Configuration
@PropertySource(value= {"classpath:db.properties", "xxx"},ignoreResourceNotFound=true)public classDBConfig {
@Value("${db.url}")privateString url;
@Value("${db.driverClassName}")privateString driverClassName;
@Value("${db.username}")privateString username;
@Value("${db.password}")privateString password;
@Bean(destroyMethod="close")publicDataSource dataSource () {
System.out.println("======url=" +url);
BoneCPDataSource dataSource= newBoneCPDataSource();
dataSource.setDriverClass(driverClassName);
dataSource.setJdbcUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);//检查数据库连接池中空闲连接的间隔时间，单位分，默认240，如果要取消设置为0
dataSource.setIdleConnectionTestPeriodInMinutes(60);//连接池中未使用的连接最大存活时间，单位分，默认60，如果要永远存活设置为0
dataSource.setIdleMaxAgeInMinutes(30);//每个分区最大连接数
dataSource.setMaxConnectionsPerPartition(100);//每个分区最小连接数
dataSource.setMinConnectionsPerPartition(5);returndataSource;
}
}
测试数据源是否配置成功
public classTestDemo {public static voidmain(String[] args) {
AnnotationConfigApplicationContext context=
new AnnotationConfigApplicationContext(DBConfig.class);
DataSource dataSource= context.getBean(DataSource.class);
System.out.println(dataSource);
context.close();
}
}
==============以上使用的是javaConfig配置==============
==============xml配置参考==============
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