Spring Framework 5.0 入门教程

<dependencies>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId> spring-context</artifactId>
    <version>5.1.0.BUILD-SNAPSHOT</version>
  </dependency>
</dependencies><repositories>
  <repository>
    <id>spring-snapshots</id>
    <name>Spring Snapshots</name>
    <url>https://repo.spring.io/libs-snapshot</url>
    <snapshots>
      <enabled>true</enabled>
    </snapshots>
  </repository>
</repositories>

dependencies {
  compile 'org.springframework: spring-context:5.1.0.BUILD-SNAPSHOT'
}repositories {
  maven {
    url 'https://repo.spring.io/libs-snapshot'
  }
}

<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.xingyun</groupId>
  <artifactId>spring-context-sample</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>spring-context-sample</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId> spring-context</artifactId>
      <version>5.1.0.BUILD-SNAPSHOT</version>
    </dependency>
  </dependencies>

  <repositories>
    <repository>
      <id>spring-snapshots</id>
      <name>Spring Snapshots</name>
      <url>https://repo.spring.io/libs-snapshot</url>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
    </repository>
  </repositories>


</project>

package com.xingyun.spring_context_sample.hello;

public interface MessageService {
  String getMessage();
}

package com.xingyun.spring_context_sample.hello;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class MessagePrinter {
  final private MessageService service;

  @Autowired
  public MessagePrinter(MessageService service) {
    this.service = service;
  }

  public void printMessage() {
    System.out.println(this.service.getMessage());
  }
}

package com.xingyun.spring_context_sample;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

import com.xingyun.spring_context_sample.hello.MessagePrinter;
import com.xingyun.spring_context_sample.hello.MessageService;

@Configuration
@ComponentScan
public class App 
{
  @Bean
  MessageService mockMessageService() {
    return new MessageService() {
      public String getMessage() {
       return "Hello World!";
      }
    };
  }
  public static void main( String[] args )
  {
     ApplicationContext context = 
         new AnnotationConfigApplicationContext(App.class);
       MessagePrinter printer = context.getBean(MessagePrinter.class);
       printer.printMessage();
  }
}