6.1 SpringBoot的核心:基本配置

6.1 SpringBoot的核心:基本配置

6.1.1 入口类和SpringBootApplication

1.SpringBoot通常有*Application的入口类，入口类有一个Main方法。
   main方法是标准的Java应用程序入口方法，
2.@SpringBootApplication是一个组合注解
  @EnableAutoConfiguration可用让SpringBoot根据类中的jar依赖为当前的项目进行配置
   eg. 添加了SpringBoot-starter-data-jpa.Spring会自动进行JPA的相关配置
3.SpringBoot会自动扫描@SpringBootApplication所在类的同级包及下级包的Bean

举例：

 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters = {
      @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),
      @Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) })
public @interface SpringBootApplication {

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6.1.2 关闭特定的自动配置

根据SpringBootApplication可以看出只要加上exclude的参数就行
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

举例：

/**
 * Exclude specific auto-configuration classes such that they will never be applied.
 * @return the classes to exclude
 */
@AliasFor(annotation = EnableAutoConfiguration.class, attribute = "exclude")
Class<?>[] exclude() default {};

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6.1.3 定制banner

1.在src/main/resources下新建一个banner.txt
2.生成字符复制进去就行

---

6.1.4 SpringBoot的配置文件

1.SpringBoot使用一个全局的配置文件Application.properties或者.yml放在src/main.resources
2.支持proerties和yaml语言配置
3.配置文件的作用是对默认值的修改

举例：

server:
  port: 8081
  context-path: /chao
spring:
  thymeleaf:
    prefix: classpath:/templates/
    suffix: .html
    encoding: utf-8
    content-type: text/html
    mode: HTML5
    cache: false
  freemarker:
    charset: UTF-8
    content-type: text/html
    cache: false
    suffix: .html

url:
  security:
    ## 拦截需要验证的url,数组的形式
    ## authenticated: /private/**,/framework/**
    authenticated: /private/**

6.1.5 starter pom

1.Spring为我们提供了简化企业级开发的大多数场景下的starter pom

官方：

6.1.6 使用XML配置(感觉非常重要！因为传统的项目迁移为新的SpringBoot项目使用这个简单)

1.SpringBoot提供无XML配置，但是实际过程中，我们可以通过Spring提供的@ImportResource来加载XML配置
2.注意：
   1.应该是SpringBoot只有一个properties,所以配置的参数必须在统一的文件里面
   2.不能有EnableCaching的注解，它依赖RedisAuto  

举例：

@SpringBootApplication(exclude = RedisAutoConfiguration.class)
//@EnableCaching//表示redis开启缓存
@ImportResource(value = "classpath:spring-redis.xml")

dev.properties

#redis配置信息
redis.host=139.198.176.43
redis.port=6379
redis.password=123456
redis.timeout=1000

redis.pool.maxActive=1024
redis.pool.maxIdle=200
redis.pool.minIdle=10
redis.pool.maxWait=3000
redis.pool.testOnBorrow=true
redis.pool.testOnReturn=true

spring-redis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
           http://www.springframework.org/schema/aop     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
           http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/tx      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
       ">

    <!-- classpath:redis.properties; -->
    <!-- 必须要把 redis.properties 中的参数迁移到统一的地方 application-dev.properties-->
    <!--<bean id="propertyConfigurer"-->
          <!--class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">-->
        <!--<property name="location" value="classpath:redis.properties"/>-->
    <!--</bean>-->

    <!-- redis连接池的配置 -->
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="minIdle" value="${redis.pool.minIdle}"/>
        <property name="maxIdle" value="${redis.pool.maxIdle}"/>
        <property name="maxTotal" value="${redis.pool.maxActive}"/>
        <property name="maxWaitMillis" value="${redis.pool.maxWait}"/>
        <property name="testOnBorrow" value="${redis.pool.testOnBorrow}"/>
    </bean>

    <!-- redis连接器，不是必选项：timeout/password -->
    <bean id="pcJedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="hostName" value="${redis.host}"></property>
        <property name="port" value="${redis.port}"></property>
        <property name="password" value="${redis.password}"></property>
        <property name="timeout" value="${redis.timeout}"></property>
        <property name="usePool" value="true"></property>
        <property name="poolConfig" ref="jedisPoolConfig"></property>
    </bean>

    <!-- redis template definition -->
    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="pcJedisConnectionFactory"></property>
        <property name="keySerializer">
            <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/>
        </property>
        <property name="valueSerializer">
            <bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/>
        </property>
    </bean>
</beans>