菜鸟-SpringBoot高级(SpringBoot自定配置 ;SpringBoot事件监听; SpringBoot流程分析; SpringBoot监控; SpringBoot部署)
01-SpringBoot高级-今日内容
- SpringBoot自定配置
- SpringBoot事件监听
- SpringBoot流程分析
- SpringBoot监控
- SpringBoot部署
02-SpringBoot自动配置-Condition-1
Condition是Spring4.0后引入的条件化配置接口,通过实现Condition接口可以完成有条件的加载相应的Bean
@Conditional要配和Condition的实现类(ClassCondition)进行使用
- ClassCondition
public class ClassCondition implements Condition {/*** * @param context 上下文对象。用于获取环境,IOC容器,ClassLoader对象 * @param metadata 注解元对象。 可以用于获取注解定义的属性值 * @return */ @Override public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) { //1.需求: 导入Jedis坐标后创建Bean //思路:判断redis.clients.jedis.Jedis.class文件是否存在 boolean flag = true; try { Class<?> cls = Class.forName("redis.clients.jedis.Jedis"); } catch (ClassNotFoundException e) { flag = false; } return flag; } }
- UserConfig
@Configuration public class UserConfig { @Bean @Conditional(ClassCondition.class) public User user(){ return new User(); } }
测试
@SpringBootApplication public class SpringbootConditionApplication { public static void main(String[] args) { //启动SpringBoot的应用,返回Spring的IOC容器 ConfigurableApplicationContext context = SpringApplication.run(SpringbootConditionApplication.class, args); Object user = context.getBean("user"); System.out.println(user); } }
03-SpringBoot自动配置-Condition-2
需求:将类的判断定义为动态的。判断哪个字节码文件存在可以动态指定。
自定义条件注解类
import org.springframework.context.annotation.Conditional; import java.lang.annotation.*; @Target({ElementType.TYPE, ElementType.METHOD}) @Retention(RetentionPolicy.RUNTIME) @Documented @Conditional(ClassCondition.class) public @interface ConditionOnClass { String[] value(); }
**注意:**此处@ConditionOnClass为自定义注解
@Configuration public class UserConfig { @Bean //@Conditional(ClassCondition.class) @ConditionOnClass("com.alibaba.fastjson.JSON") public User user(){ return new User(); } @Bean @ConditionalOnProperty(name = "itcast",havingValue = "itheima") public User user2(){ return new User(); } }
测试User对象的创建
@SpringBootApplication public class SpringbootConditionApplication { public static void main(String[] args) { //启动SpringBoot的应用,返回Spring的IOC容器 ConfigurableApplicationContext context = SpringApplication.run(SpringbootConditionApplication.class, args); Object user = context.getBean("user"); System.out.println(user); } }
查看条件注解源码
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SpringBoot 提供的常用条件注解:
ConditionalOnProperty:判断配置文件中是否有对应属性和值才初始化Bean
ConditionalOnClass:判断环境中是否有对应字节码文件才初始化Bean
ConditionalOnMissingBean:判断环境中没有对应Bean才初始化Bean
04-SpringBoot自动配置-切换内置web服务器
查看继承关系图
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排除Tomcat
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pom文件中的排除依赖效果
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <!--排除tomcat依赖--> <exclusions> <exclusion> <artifactId>spring-boot-starter-tomcat</artifactId> <groupId>org.springframework.boot</groupId> </exclusion> </exclusions> </dependency> <!--引入jetty的依赖--> <dependency> <artifactId>spring-boot-starter-jetty</artifactId> <groupId>org.springframework.boot</groupId> </dependency>
05-SpringBoot自动配置-Enable注解原理
-
SpringBoot不能直接获取在其他工程中定义的Bean
演示代码:
springboot-enable工程
/**
- @ComponentScan 扫描范围:当前引导类所在包及其子包
- com.itheima.springbootenable
- com.itheima.config
- //1.使用@ComponentScan扫描com.itheima.config包
- //2.可以使用@Import注解,加载类。这些类都会被Spring创建,并放入IOC容器
- //3.可以对Import注解进行封装。
*/
//@ComponentScan(“com.itheima.config”)
//@Import(UserConfig.class)
@EnableUser
@SpringBootApplication
public class SpringbootEnableApplication {
public static void main(String[] args) { ConfigurableApplicationContext context = SpringApplication.run(SpringbootEnableApplication.class, args); //获取Bean Object user = context.getBean("user"); System.out.println(user); }
}
pom中引入springboot-enable-other
<dependency> <groupId>com.itheima</groupId> <artifactId>springboot-enable-other</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency>
springboot-enable-other工程 **UserConfig** ```java @Configuration public class UserConfig { @Bean public User user() { return new User(); } }
EnableUser注解类
import org.springframework.context.annotation.Import; import java.lang.annotation.*; @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Import(UserConfig.class) public @interface EnableUser { }
原因:@ComponentScan 扫描范围:当前引导类所在包及其子包
三种解决方案:
1.使用@ComponentScan扫描com.itheima.config包
2.可以使用@Import注解,加载类。这些类都会被Spring创建,并放入IOC容器
3.可以对Import注解进行封装。
重点:Enable注解底层原理是使用@Import注解实现Bean的动态加载
06-SpringBoot自动配置-@Import详解
@Enable*底层依赖于@Import注解导入一些类,使用@Import导入的类会被Spring加载到IOC容器中。而@Import提供4中用法:
①导入Bean
②导入配置类
③导入 ImportSelector 实现类。一般用于加载配置文件中的类
④导入 ImportBeanDefinitionRegistrar 实现类。
-
导入Bean @Import(User.class)
-
导入配置类 @Import(UserConfig.class)
-
导入 ImportSelector 实现类 @Import(MyImportSelector.class)
MyImportSelector
public class MyImportSelector implements ImportSelector { @Override public String[] selectImports(AnnotationMetadata importingClassMetadata) { return new String[]{"com.itheima.domain.User", "com.itheima.domain.Role"}; } }
-
导入 ImportBeanDefinitionRegistrar 实现类。@Import({MyImportBeanDefinitionRegistrar.class})
public class MyImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar { @Override public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) { AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.rootBeanDefinition(User.class).getBeanDefinition(); registry.registerBeanDefinition("user", beanDefinition); } }
SpringbootEnableApplication测试代码
/**
- Import4中用法:
-
导入Bean
-
-
导入配置类
-
-
导入ImportSelector的实现类。
-
-
导入ImportBeanDefinitionRegistrar实现类
*/
//@Import(User.class)
//@Import(UserConfig.class)
//@Import(MyImportSelector.class)
//@Import({MyImportBeanDefinitionRegistrar.class})
@SpringBootApplication
public class SpringbootEnableApplication {
public static void main(String[] args) { ConfigurableApplicationContext context = SpringApplication.run(SpringbootEnableApplication.class, args); /*//获取Bean Object user = context.getBean("user"); System.out.println(user);*/ /*User user = context.getBean(User.class); System.out.println(user); Role role = context.getBean(Role.class); System.out.println(role);*/ /* Object user = context.getBean("user"); System.out.println(user);*/ Map<String, User> map = context.getBeansOfType(User.class); System.out.println(map); }
}
@EnableAutoConfiguration中使用的是第三种方式:@Import(AutoConfigurationImportSelector.class) ## **07-SpringBoot自动配置-@EnableAutoConfiguration详解** [外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-TWpwdoOf-1591257802837)(img/1571387384701.png)] - @EnableAutoConfiguration 注解内部使用 @Import(AutoConfigurationImportSelector.**class**)来加载配置类。 - 配置文件位置:META-INF/spring.factories,该配置文件中定义了大量的配置类,当 SpringBoot 应用启动时,会自动加载这些配置类,初始化Bean - 并不是所有的Bean都会被初始化,在配置类中使用Condition来加载满足条件的Bean ## **08-SpringBoot自动配置-自定义starter步骤分析** **需求:**自定义redis-starter。要求当导入redis坐标时,SpringBoot自动创建Jedis的Bean。 **步骤:** ①创建 redis-spring-boot-autoconfigure 模块 ②创建 redis-spring-boot-starter 模块,依赖 redis-spring-boot-autoconfigure的模块 ③在 redis-spring-boot-autoconfigure 模块中初始化 Jedis 的 Bean。并定义META-INF/spring.factories 文件 ④在测试模块中引入自定义的 redis-starter 依赖,测试获取 Jedis 的Bean,操作 redis。 ## **09-SpringBoot自动配置-自定义starter实现-1** 1. **创建redis-spring-boot-starter工程** pom文件中引入redis-spring-boot-autoconfigure ```xml <!--引入configure--> <dependency> <groupId>com.itheima</groupId> <artifactId>redis-spring-boot-autoconfigure</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency>
- 创建redis-spring-boot-autoconfigure配置工程
创建RedisProperties配置文件参数绑定类
@ConfigurationProperties(prefix = "redis") public class RedisProperties { private String host = "localhost"; private int port = 6379; public String getHost() { return host; } public void setHost(String host) { this.host = host; } public int getPort() { return port; } public void setPort(int port) { this.port = port; } }
创建RedisAutoConfiguration自动配置类
@Configuration @EnableConfigurationProperties(RedisProperties.class) public class RedisAutoConfiguration { /*** 提供Jedis的bean */ @Bean public Jedis jedis(RedisProperties redisProperties) { return new Jedis(redisProperties.getHost(), redisProperties.getPort()); } }
在resource目录下创建META-INF文件夹并创建spring.factories
注意:”\ “是换行使用的
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\ com.itheima.redis.config.RedisAutoConfiguration
- 在springboot-enable工程中引入自定义的redis的starter
<!--自定义的redis的starter--> <dependency> <groupId>com.itheima</groupId> <artifactId>redis-spring-boot-starter</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency>
在SpringbootEnableApplication启动类中测试
Jedis jedis = context.getBean(Jedis.class); System.out.println(jedis);
10-SpringBoot自动配置-自定义starter实现-2
测试springboot-enable工程中的application.properties中的配置参数
redis.port=6666
使用注解完成有条件加载配置类
@Configuration @EnableConfigurationProperties(RedisProperties.class) @ConditionalOnClass(Jedis.class) public class RedisAutoConfiguration { /*** 提供Jedis的bean */ @Bean @ConditionalOnMissingBean(name = "jedis") public Jedis jedis(RedisProperties redisProperties) { System.out.println("RedisAutoConfiguration...."); return new Jedis(redisProperties.getHost(), redisProperties.getPort()); } }
11-SpringBoot事件监听
Java中的事件监听机制定义了以下几个角色:
①事件:Event,继承 java.util.EventObject 类的对象
②事件源:Source ,任意对象Object
③监听器:Listener,实现 java.util.EventListener 接口 的对象
SpringBoot 在项目启动时,会对几个监听器进行回调,我们可以实现这些监听器接口,在项目启动时完成一些操作。
-
ApplicationContextInitializer、
-
SpringApplicationRunListener、
-
CommandLineRunner、
-
ApplicationRunner
自定义监听器的启动时机:MyApplicationRunner和MyCommandLineRunner都是当项目启动后执行,使用@Component放入容器即可使用
MyApplicationRunner
/** * 当项目启动后执行run方法。 */ @Component public class MyApplicationRunner implements ApplicationRunner { @Override public void run(ApplicationArguments args) throws Exception { System.out.println("ApplicationRunner...run"); System.out.println(Arrays.asList(args.getSourceArgs())); } }
MyCommandLineRunner
@Component public class MyCommandLineRunner implements CommandLineRunner { @Override public void run(String... args) throws Exception { System.out.println("CommandLineRunner...run"); System.out.println(Arrays.asList(args)); } }
MyApplicationContextInitializer的使用要在resource文件夹下添加META-INF/spring.factories
org.springframework.context.ApplicationContextInitializer=com.itheima.springbootlistener.listener.MyApplicationContextInitializer
@Component public class MyApplicationContextInitializer implements ApplicationContextInitializer { @Override public void initialize(ConfigurableApplicationContext applicationContext) { System.out.println("ApplicationContextInitializer....initialize"); } }
MySpringApplicationRunListener的使用要添加构造器
public class MySpringApplicationRunListener implements SpringApplicationRunListener { public MySpringApplicationRunListener(SpringApplication application, String[] args) { } @Override public void starting() { System.out.println("starting...项目启动中"); } @Override public void environmentPrepared(ConfigurableEnvironment environment) { System.out.println("environmentPrepared...环境对象开始准备"); } @Override public void contextPrepared(ConfigurableApplicationContext context) { System.out.println("contextPrepared...上下文对象开始准备"); } @Override public void contextLoaded(ConfigurableApplicationContext context) { System.out.println("contextLoaded...上下文对象开始加载"); } @Override public void started(ConfigurableApplicationContext context) { System.out.println("started...上下文对象加载完成"); } @Override public void running(ConfigurableApplicationContext context) { System.out.println("running...项目启动完成,开始运行"); } @Override public void failed(ConfigurableApplicationContext context, Throwable exception) { System.out.println("failed...项目启动失败"); } }
12-SpringBoot流程分析-初始化
-
配置启动引导类(判断是否有启动主类)
-
判断是否是Web环境
-
获取初始化类、监听器类
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13-SpringBoot流程分析-run
-
启动计时器
-
执行监听器
-
准备环境
-
打印banner:可以resource下粘贴自定义的banner
-
创建context
refreshContext(context);
执行refreshContext方法后才真正创建Bean
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14-SpringBoot监控-actuator基本使用
①导入依赖坐标
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency>
②访问http://localhost:8080/acruator
{ "_links":{ "self":{ "href":"http://localhost:8080/actuator", "templated":false }, "health":{ "href":"http://localhost:8080/actuator/health", "templated":false }, "health-component-instance":{ "href":"http://localhost:8080/actuator/health/{component}/{instance}", "templated":true }, "health-component":{ "href":"http://localhost:8080/actuator/health/{component}", "templated":true }, "info":{ "href":"http://localhost:8080/actuator/info", "templated":false } } }
http://localhost:8080/actuator/info
在application.properties中配置
info.name=lucy info.age=99
http://localhost:8080/actuator/health
开启健康检查详细信息
management.endpoint.health.show-details=always
{ "status":"UP", "details":{ "diskSpace":{ "status":"UP", "details":{ "total":159579508736, "free":13558104064, "threshold":10485760 } }, "redis":{ "status":"UP", "details":{ "version":"2.4.5" } } } }
15-SpringBoot监控-actuator开启所有endpoint
开启所有endpoint
在application.properties中配置:
management.endpoints.web.exposure.include=*
开启所有endpoint的返回结果:
{ "_links":{ "self":{ "href":"http://localhost:8080/actuator", "templated":false }, "auditevents":{ "href":"http://localhost:8080/actuator/auditevents", "templated":false }, "beans":{ "href":"http://localhost:8080/actuator/beans", "templated":false }, "caches-cache":{ "href":"http://localhost:8080/actuator/caches/{cache}", "templated":true }, "caches":{ "href":"http://localhost:8080/actuator/caches", "templated":false }, "health-component-instance":{ "href":"http://localhost:8080/actuator/health/{component}/{instance}", "templated":true }, "health":{ "href":"http://localhost:8080/actuator/health", "templated":false }, "health-component":{ "href":"http://localhost:8080/actuator/health/{component}", "templated":true }, "conditions":{ "href":"http://localhost:8080/actuator/conditions", "templated":false }, "configprops":{ "href":"http://localhost:8080/actuator/configprops", "templated":false }, "env":{ "href":"http://localhost:8080/actuator/env", "templated":false }, "env-toMatch":{ "href":"http://localhost:8080/actuator/env/{toMatch}", "templated":true }, "info":{ "href":"http://localhost:8080/actuator/info", "templated":false }, "loggers":{ "href":"http://localhost:8080/actuator/loggers", "templated":false }, "loggers-name":{ "href":"http://localhost:8080/actuator/loggers/{name}", "templated":true }, "heapdump":{ "href":"http://localhost:8080/actuator/heapdump", "templated":false }, "threaddump":{ "href":"http://localhost:8080/actuator/threaddump", "templated":false }, "metrics-requiredMetricName":{ "href":"http://localhost:8080/actuator/metrics/{requiredMetricName}", "templated":true }, "metrics":{ "href":"http://localhost:8080/actuator/metrics", "templated":false }, "scheduledtasks":{ "href":"http://localhost:8080/actuator/scheduledtasks", "templated":false }, "httptrace":{ "href":"http://localhost:8080/actuator/httptrace", "templated":false }, "mappings":{ "href":"http://localhost:8080/actuator/mappings", "templated":false } } }
16-SpringBoot监控-springboot admin图形化界面使用
SpringBoot Admin 有两个角色,客户端(Client)和服务端(Server)。
以下为创建服务端和客户端工程步骤:
admin-server:
①创建 admin-server 模块
②导入依赖坐标 admin-starter-server
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<dependency> <groupId>de.codecentric</groupId> <artifactId>spring-boot-admin-starter-server</artifactId> </dependency>
③在引导类上启用监控功能@EnableAdminServer
@EnableAdminServer @SpringBootApplication public class SpringbootAdminServerApplication { public static void main(String[] args) { SpringApplication.run(SpringbootAdminServerApplication.class, args); } }
admin-client:
①创建 admin-client 模块
②导入依赖坐标 admin-starter-client
<dependency> <groupId>de.codecentric</groupId> <artifactId>spring-boot-admin-starter-client</artifactId> </dependency>
③配置相关信息:server地址等
# 执行admin.server地址 spring.boot.admin.client.url=http://localhost:9000 management.endpoint.health.show-details=alwaysmanagement.endpoints.web.exposure.include=*
④启动server和client服务,访问server
17-SpringBoot部署
SpringBoot 项目开发完毕后,支持两种方式部署到服务器:
①jar包(官方推荐)
②war包
更改pom文件中的打包方式为war
修改启动类
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.builder.SpringApplicationBuilder; import org.springframework.boot.web.servlet.support.SpringBootServletInitializer; @SpringBootApplication public class SpringbootDeployApplication extends SpringBootServletInitializer { public static void main(String[] args) { SpringApplication.run(SpringbootDeployApplication.class, args); } @Override protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) { return builder.sources(SpringbootDeployApplication.class); }}
指定打包的名称
<build> <finalName>springboot</finalName> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
k.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
@SpringBootApplication
public class SpringbootDeployApplication extends SpringBootServletInitializer {
public static void main(String[] args) { SpringApplication.run(SpringbootDeployApplication.class, args); } @Override protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) { return builder.sources(SpringbootDeployApplication.class); }
}
指定打包的名称 ```xml <build> <finalName>springboot</finalName> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
- 02-SpringBoot高级(SpringBoot自定配置 ;SpringBoot事件监听; SpringBoot流程分析; SpringBoot监控; SpringBoot部署)
- spring boot自动配置与启动流程分析
- spring boot实战(第三篇)事件监听源码分析
- SpringBoot启动流程分析(五):SpringBoot自动装配原理实现
- SpringBoot系列七:SpringBoot 整合 MyBatis(配置 druid 数据源、配置 MyBatis、事务控制、druid 监控)
- springboot部署到阿里云,配置https,springboot项目同时支持http和https请求,阿里云配置https
- Spring Boot 启动配置原理和启动事件监听
- (转)spring boot实战(第三篇)事件监听源码分析
- 009-Spring Boot 事件监听、配置与方式
- springboot部署到阿里云,配置https,springboot项目同时支持http和https请求,阿里云配置https
- SpringBoot系列三:SpringBoot基本概念(统一父 pom 管理、SpringBoot 代码测试、启动注解分析、配置访问路径、使用内置对象、项目打包发布)
- SpringBoot系列之二intelliJ idea 配置Spring boot 热部署
- SpringBoot事件监听机制源码分析(上) SpringBoot源码(九)
- spring boot实战二 事件监听
- springBoot actuator监控配置及使用
- 55. spring boot 服务配置和部署【从零开始学Spring Boot】
- Spring Boot学习笔记-配置devtools实现热部署
- springBoot事件监听 在项目实际业务中的异步应用
- Spring源码分析:Bean加载流程概览及配置文件读取
- Spring Boot 使用 Druid 和监控配置