深入学习Spring Boot自动装配

44.Spring-Boot-Autoconfiguration/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.0.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.example</groupId>
+    <artifactId>autoconfig</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>demo</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/DemoApplication.java

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+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoApplication.class, args);
+    }
+
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/annotation/EnableHelloWorld.java

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+package com.example.demo.annotation;
+
+import com.example.demo.configuration.HelloWorldConfiguration;
+import org.springframework.context.annotation.Import;
+
+import java.lang.annotation.*;
+
+/**
+ * @author MrBird
+ */
+@Target({ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+// @Import(HelloWorldImportSelector.class)
+@Import(HelloWorldConfiguration.class)
+public @interface EnableHelloWorld {
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/annotation/FirstLevelService.java

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+package com.example.demo.annotation;
+
+import org.springframework.stereotype.Repository;
+import org.springframework.stereotype.Service;
+
+import java.lang.annotation.*;
+
+@Target({ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@Service
+public @interface FirstLevelService {
+    String value() default "";
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/annotation/SecondLevelService.java

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+package com.example.demo.annotation;
+
+import java.lang.annotation.*;
+
+@Target({ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@FirstLevelService
+public @interface SecondLevelService {
+    String value() default "";
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/bootstrap/EnableAutoConfigurationBootstrap.java

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+package com.example.demo.bootstrap;
+
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.ConfigurableApplicationContext;
+
+/**
+ * @author MrBird
+ */
+@EnableAutoConfiguration
+public class EnableAutoConfigurationBootstrap {
+
+    public static void main(String[] args) {
+        ConfigurableApplicationContext context = new SpringApplicationBuilder(EnableAutoConfigurationBootstrap.class)
+                .web(WebApplicationType.NONE)
+                .run(args);
+        String hello = context.getBean("hello", String.class);
+        System.out.println("hello Bean: " + hello);
+        context.close();
+    }
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/bootstrap/ServiceBootstrap.java

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+package com.example.demo.bootstrap;
+
+import com.example.demo.service.TestService;
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.ComponentScan;
+
+/**
+ * @author MrBird
+ */
+@ComponentScan("com.example.demo.service")
+public class ServiceBootstrap {
+
+    public static void main(String[] args) {
+        ConfigurableApplicationContext context = new SpringApplicationBuilder(ServiceBootstrap.class)
+                .web(WebApplicationType.NONE)
+                .run(args);
+        TestService testService = context.getBean("testService", TestService.class);
+        System.out.println("TestService Bean: " + testService);
+        context.close();
+    }
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/bootstrap/TestEnableBootstap.java

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+package com.example.demo.bootstrap;
+
+import com.example.demo.annotation.EnableHelloWorld;
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.ConfigurableApplicationContext;
+
+/**
+ * @author MrBird
+ */
+@EnableHelloWorld
+public class TestEnableBootstap {
+    public static void main(String[] args) {
+        ConfigurableApplicationContext context = new SpringApplicationBuilder(TestEnableBootstap.class)
+                .web(WebApplicationType.NONE)
+                .run(args);
+        String hello = context.getBean("hello", String.class);
+        System.out.println("hello Bean: " + hello);
+        context.close();
+    }
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/configuration/HelloWorldAutoConfiguration.java

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+package com.example.demo.configuration;
+
+import com.example.demo.annotation.EnableHelloWorld;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * @author MrBird
+ */
+@Configuration
+@EnableHelloWorld
+@ConditionalOnProperty(name = "helloworld", havingValue = "true")
+public class HelloWorldAutoConfiguration {
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/configuration/HelloWorldConfiguration.java

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+package com.example.demo.configuration;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * @author MrBird
+ */
+@Configuration
+public class HelloWorldConfiguration {
+
+    @Bean
+    public String hello() {
+        return "hello world";
+    }
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/selector/HelloWorldImportSelector.java

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+package com.example.demo.selector;
+
+import com.example.demo.configuration.HelloWorldConfiguration;
+import org.springframework.context.annotation.ImportSelector;
+import org.springframework.core.type.AnnotationMetadata;
+
+/**
+ * @author MrBird
+ */
+public class HelloWorldImportSelector implements ImportSelector {
+    @Override
+    public String[] selectImports(AnnotationMetadata importingClassMetadata) {
+        return new String[]{HelloWorldConfiguration.class.getName()};
+    }
+}

44.Spring-Boot-Autoconfiguration/src/main/java/com/example/demo/service/TestService.java

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+package com.example.demo.service;
+
+import com.example.demo.annotation.FirstLevelService;
+import com.example.demo.annotation.SecondLevelService;
+
+/**
+ * @author MrBird
+ */
+@SecondLevelService
+public class TestService {
+}

44.Spring-Boot-Autoconfiguration/src/main/resources/META-INF/spring.factories

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+# Auto Configure
+org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
+com.example.demo.configuration.HelloWorldAutoConfiguration

44.Spring-Boot-Autoconfiguration/src/main/resources/application.properties

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+helloworld=true

44.Spring-Boot-Autoconfiguration/src/test/java/com/example/demo/DemoApplicationTests.java

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+package com.example.demo;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class DemoApplicationTests {
+
+    @Test
+    public void contextLoads() {
+    }
+
+}