Spring Framework5.0 学习（2）-- Quick Start

官网：https://projects.spring.io/spring-framework/

Spring Framework 5.x 要求 JDK 1.8以上

1.0   在（1）的基础上，给build.gradle文件中添加 依赖

compile 'org.springframework:spring-context:5.0.0.RELEASE'

2.0  gradle.build

apply plugin: 'java-library'
apply plugin: 'idea'

// mainClassName 是 application的一个属性，否则会报错
apply plugin: 'application'
mainClassName = 'hello.Application'

sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    compile "joda-time:joda-time:2.2"
    compile 'org.springframework:spring-context:5.0.0.RELEASE'
}

// 该项目生成的jar包的名字和版本，如 gs-gradle-0.1.0.jar
jar {
    baseName = 'gs-gradle'
    version =  '0.1.0'
}

MessageService.java

package hello;

/**
 * Created by sheting on 10/22/2017
 */
public interface MessageService {
    String getMessage();
}

MessagePrinter.java

package hello;

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

/**
 * Created by sheting on 10/22/2017
 */
@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());
    }
}

Application.java

package hello;

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;

/**
 * Created by sheting on 10/22/2017
 */

@Configuration
@ComponentScan
public class Application {

    @Bean
    MessageService mockMessageService() {
        return new MessageService() {
            public String getMessage() {
                return "Hello World!";
            }
        };
    }

    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(Application.class);
        MessagePrinter printer = context.getBean(MessagePrinter.class);
        printer.printMessage();
    }
}

运行结果：