构建ribbon 负载均衡
#1.pom中加入ribbon依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>
#2. 加入@LoadBalanced注解 @Bean //定义负载均衡方式，这里使用自带的随机方式，也可以自定义负载均衡方式
public IRule getRule() {
return new RandomRule();
}
@Bean
@LoadBalanced //加入注解，启用负载均衡
public RestTemplate restTemplate() {
return new RestTemplate();
}
#3.引用配置中心
首先将配置文件application.yml更名为bootstrap.yml，原因是当启动配置中心的时候，会默认从bootstrap.yml文件中读取配置中心的属性，如果找不到，则会默认从localhost:8888所表示的配置中心中读取配置文件，会出现如下的错误：
2017-12-12 17:25:59.406 INFO 6384 --- [ main] c.c.c.ConfigServicePropertySourceLocator : Fetching config from server at: http://localhost:8888
2017-12-12 17:26:00.555 WARN 6384 --- [ main] c.c.c.ConfigServicePropertySourceLocator : Could not locate PropertySource: I/O error on GET request for "http://localhost:8888/cloud-config/test": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
2017-12-12 17:26:00.560 INFO 6384 --- [ main] com.yanggy.ServiceUser : No active profile set, falling back to default profiles: default
引入maven依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
application.yml中添加配置中心配置属性，
spring:
cloud:
config:
name: cloud-config # 要读取的配置文件application属性
profile: ${config.profile:dd} # default config profile
username: xxxxxx #github账户
password: xxxxxx
discovery:
enabled: true
service-id: cloud-config
#从配置中心加载数据库信息
定义接收从配置中心获取到的数据库属性类
@Data
@Component
@ConfigurationProperties(prefix = DataSourceProperties.PREFIX, ignoreUnknownFields = false)
public class DataSourceProperties {
public final static String PREFIX="jdbc";
private String type;
private String driver;
private String url;
private String username;
private String password;
private int initialSize;
private int minIdle;
private int maxActive;
private int maxWait;
private int timeBetweenEvictionRunsMillis;
private int minEvictableIdleTimeMillis;
public DataSourceProperties() {
super();
}
}
定义datasource bean
@Configuration
@MapperScan(DataSourceConfiguration.MAPPER_PACKAGE_PATH)
@EnableConfigurationProperties(DataSourceProperties.class)
@EnableTransactionManagement
public class DataSourceConfiguration {
private final static String MAPPER_LOCATIONS = "sql-mapper/*.xml";
private final static String ENTITY_PACKAGE_PATH = "com.yanggy.model";
protected final static String MAPPER_PACKAGE_PATH = "com.yanggy.mapper";
@Autowired
private DataSourceProperties dataSourceProperties;
private DruidDataSource datasource = null;
@Bean(destroyMethod = "close")
public DataSource dataSource(){
datasource = new DruidDataSource();
datasource.setUrl(dataSourceProperties.getUrl());
datasource.setDbType(dataSourceProperties.getType());
datasource.setDriverClassName(dataSourceProperties.getDriver());
datasource.setUsername(dataSourceProperties.getUsername());
datasource.setPassword(dataSourceProperties.getPassword());
return datasource;
}
@PreDestroy
public void close() {
if(datasource != null){
datasource.close();
}
}
@Bean
public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource());
PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
sqlSessionFactoryBean.setMapperLocations(resolver.getResources(MAPPER_LOCATIONS));
sqlSessionFactoryBean.setTypeAliasesPackage(ENTITY_PACKAGE_PATH);
return sqlSessionFactoryBean.getObject();
}
@Bean
public PlatformTransactionManager transactionManager() {
return new DataSourceTransactionManager(dataSource());
}
}
通过以上步骤，数据库配置完毕。
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