Spring Boot 2.0 新特性：配置绑定 2.0 全解析

Chapter2-2-1/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>
+
+	<groupId>com.didispace</groupId>
+	<artifactId>Chapter2-2-1</artifactId>
+	<version>1.0.0</version>
+	<packaging>jar</packaging>
+
+	<name>Chapter2-2-1</name>
+	<description>Spring Boot 2 : Relaxed Binding</description>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.0.0.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<version>1.16.20</version>
+		</dependency>
+
+	</dependencies>
+	
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

Chapter2-2-1/src/main/java/com/didispace/Application.java

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+package com.didispace;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.properties.ConfigurationPropertiesBinding;
+import org.springframework.boot.context.properties.bind.Bindable;
+import org.springframework.boot.context.properties.bind.Binder;
+import org.springframework.context.ApplicationContext;
+
+import java.util.List;
+
+/**
+ *
+ * @author 程序猿DD
+ * @version 1.0.0
+ * @blog http://blog.didispace.com
+ *
+ */
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		ApplicationContext context = SpringApplication.run(Application.class, args);
+
+		Binder binder = Binder.get(context.getEnvironment());
+
+		// 绑定简单配置
+		FooProperties foo = binder.bind("com.didispace", Bindable.of(FooProperties.class)).get();
+		System.out.println(foo.getFoo());
+
+		// 绑定List配置
+		List<String> post = binder.bind("com.didispace.post", Bindable.listOf(String.class)).get();
+		System.out.println(post);
+
+		List<PostInfo> posts = binder.bind("com.didispace.posts", Bindable.listOf(PostInfo.class)).get();
+		System.out.println(posts);
+
+		// 读取配置
+		System.out.println(context.getEnvironment().containsProperty("com.didispace.database-platform"));
+		System.out.println(context.getEnvironment().containsProperty("com.didispace.databasePlatform"));
+
+	}
+
+}

Chapter2-2-1/src/main/java/com/didispace/FooProperties.java

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+package com.didispace;
+
+import lombok.Data;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@Data
+@ConfigurationProperties(prefix = "com.didispace")
+public class FooProperties {
+
+    private String foo;
+
+    private String databasePlatform;
+
+}

Chapter2-2-1/src/main/java/com/didispace/PostInfo.java

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+package com.didispace;
+
+import lombok.Data;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@Data
+@ConfigurationProperties
+public class PostInfo {
+
+    private String title;
+    private String content;
+
+}

Chapter2-2-1/src/main/resources/application.properties

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+com.didispace.foo=bar
+com.didispace.database-platform=sql
+
+com.didispace.post[0]=Why Spring Boot
+com.didispace.post[1]=Why Spring Cloud
+
+com.didispace.posts[0].title=Why Spring Boot
+com.didispace.posts[0].content=It is perfect!
+com.didispace.posts[1].title=Why Spring Cloud
+com.didispace.posts[1].content=It is perfect too!