#0 spi ServiceLoader

Author: 81673211

build.gradle

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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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.fred</groupId>
+	<artifactId>demo</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.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<version>5.5.0</version>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+				<configuration>
+					<source>1.8</source>
+					<target>1.8</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

gradle/wrapper/gradle-wrapper.jar

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+package com.fred.spi;
+
+public interface LogService {
+
+    void log();
+}

gradle/wrapper/gradle-wrapper.properties

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+package com.fred.spi.impl;
+
+import com.fred.spi.LogService;
+
+public class LogServiceAImpl implements LogService {
+    @Override
+    public void log() {
+        System.out.println("log A");
+    }
+}

gradlew

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+package com.fred.spi.impl;
+
+import com.fred.spi.LogService;
+
+public class LogServiceBImpl implements LogService {
+    @Override
+    public void log() {
+        System.out.println("log B");
+    }
+}

gradlew.bat

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+package com.fred.spi;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ServiceLoader;
+
+public class ServiceLoaderTest {
+
+    @Test
+    public void testLoad() {
+        ServiceLoader<LogService> serviceLoader = ServiceLoader.load(LogService.class);
+//        serviceLoader.iterator();
+//
+//        for (LogService logService : serviceLoader) {
+//            System.out.println(logService.getClass());
+//        }
+        for (LogService logService : serviceLoader) {
+            logService.log();
+        }
+    }
+}

pom.xml

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+com.fred.spi.impl.LogServiceAImpl
+com.fred.spi.impl.LogServiceBImpl