springboot学习章节-spring常用配置

1、Scope

package com.zhen.highlights_spring4.ch2.scope;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;

/**
 * @author zhen
 * @Date 2018/6/12 11:38
 */
@Service
@Scope("prototype")
public class DemoPrototypeService {
}
package com.zhen.highlights_spring4.ch2.scope;

import org.springframework.stereotype.Service;

/**
 * @author zhen
 * @Date 2018/6/12 11:37
 */
@Service
public class DemoSingletonService {
}
package com.zhen.highlights_spring4.ch2.scope;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

/**
 * @author zhen
 * @Date 2018/6/12 11:38
 */
@Configuration
@ComponentScan("com.zhen.highlights_spring4.ch2.scope")
public class ScopeConfig {
}
package com.zhen.highlights_spring4.ch2.scope;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * @author zhen
 * @Date 2018/6/12 11:39
 */
public class Main {
    public static void main(String[] args){
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ScopeConfig.class);
        DemoPrototypeService demoPrototypeService = context.getBean(DemoPrototypeService.class);
        DemoPrototypeService demoPrototypeService1 = context.getBean(DemoPrototypeService.class);
        System.out.println("demoPrototypeService1 == demoPrototypeService 结果是：" + (demoPrototypeService == demoPrototypeService1));

        DemoSingletonService demoSingletonService = context.getBean(DemoSingletonService.class);
        DemoSingletonService demoSingletonService1 = context.getBean(DemoSingletonService.class);
        System.out.println("demoSingletonService1 == demoSingletonService 结果是：" + (demoSingletonService == demoSingletonService1));

        context.close();
    }
}

2、Spring EL

book.author=wangyunfei
book.name=spring boot

你好

package com.zhen.highlights_spring4.ch2.el;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

/**
 * @author zhen
 * @Date 2018/6/12 11:57
 */
@Service
public class DemoService {

    @Value("其他类的属性")
    private String another;

    public String getAnother() {
        return another;
    }

    public void setAnother(String another) {
        this.another = another;
    }
}
package com.zhen.highlights_spring4.ch2.el;

import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.core.env.Environment;
import org.springframework.core.io.Resource;

/**
 * @author zhen
 * @Date 2018/6/12 11:58
 */
@Configuration
@ComponentScan("com.zhen.highlights_spring4.ch2.el")
@PropertySource("classpath:com/zhen/highlights_spring4/ch2/el/test.properties")
public class ElConfig {

    @Value("I Love You")
    private String normal;

    @Value("#{systemProperties['os.name']}")
    private String osName;

    @Value("#{ T(java.lang.Math).random() * 100.0 }")
    private double randomNumber;

    @Value("#{demoService.another}")
    private String fromAnother;

    @Value("classpath:com/zhen/highlights_spring4/ch2/el/test.txt")
    private Resource testFile;

    @Value("http://www.baidu.com")
    private Resource testUrl;

    @Value("${book.name}")
    private String bookName;

    @Autowired
    private Environment environment;

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertyConfigure(){
        return new PropertySourcesPlaceholderConfigurer();
    }

    public void outputResource(){
        try{
            System.out.println(normal);
            System.out.println(osName);
            System.out.println(randomNumber);
            System.out.println(fromAnother);

            System.out.println(IOUtils.toString(testFile.getInputStream()));
            System.out.println(IOUtils.toString(testUrl.getInputStream()));
            System.out.println(bookName);
            System.out.println(environment.getProperty("book.author"));
        }catch (Exception e){

        }
    }

}
package com.zhen.highlights_spring4.ch2.el;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * @author zhen
 * @Date 2018/6/12 12:15
 */
public class Main {
    public static void main(String[] args){
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ElConfig.class);
        ElConfig reourceService = context.getBean(ElConfig.class);

        reourceService.outputResource();

        context.close();
    }
}

3、初始化和销毁

package com.zhen.highlights_spring4.ch2.prepost;

/**
 * @author zhen
 * @Date 2018/6/12 13:13
 */
public class BeanWayService {
    public void init(){
        System.out.println("@Bean-init-method");
    }

    public BeanWayService(){
        super();
        System.out.println("初始化构造函数-BeanWayService");
    }
    public void destory(){
        System.out.println("@Bean-destory-method");
    }
}
package com.zhen.highlights_spring4.ch2.prepost;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

/**
 * @author zhen
 * @Date 2018/6/12 13:17
 */
public class JSR250WayService {
    @PostConstruct
    public void init(){
        System.out.println("jsr250-init-method");
    }

    public JSR250WayService(){
        super();
        System.out.println("初始化构造函数-JSR250WayService");
    }

    @PreDestroy
    public void destory(){
        System.out.println("jsr250-destory-method");
    }

}
package com.zhen.highlights_spring4.ch2.prepost;

import org.springframework.context.annotation.Bean;

/**
 * @author zhen
 * @Date 2018/6/12 13:19
 */
public class PrePostConfig {

    @Bean(initMethod = "init", destroyMethod = "destory")
    BeanWayService beanWayService(){
        return new BeanWayService();
    }

    @Bean
    JSR250WayService jsr250WayService(){
        return new JSR250WayService();
    }
}
package com.zhen.highlights_spring4.ch2.prepost;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * @author zhen
 * @Date 2018/6/12 13:20
 */
public class Main {

    public static void main(String[] args){
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(PrePostConfig.class);

        BeanWayService beanWayService = context.getBean(BeanWayService.class);
        JSR250WayService jsr250WayService = context.getBean(JSR250WayService.class);

        context.close();
    }

}

4、profile（为不同环境下使用不同配置提供支持）

package com.zhen.highlights_spring4.ch2.profile;

/**
 * @author zhen
 * @Date 2018/6/12 13:24
 */
public class DemoBean {

    private String content;

    public DemoBean(String content) {
        this.content = content;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}
package com.zhen.highlights_spring4.ch2.profile;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;

/**
 * @author zhen
 * @Date 2018/6/12 13:24
 */
@Configuration
public class ProfileConfig {

    @Bean
    @Profile("dev")
    public DemoBean devDemoBean(){
        return new DemoBean("from development profile");
    }

    @Bean
    @Profile("prod")
    public DemoBean prodDemoBean(){
        return new DemoBean("from production profile");
    }
}
package com.zhen.highlights_spring4.ch2.profile;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * @author zhen
 * @Date 2018/6/12 13:28
 */
public class Main {

    public static void main(String[] args){
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();

        context.getEnvironment().setActiveProfiles("dev");
        context.register(ProfileConfig.class);
        context.refresh();

        DemoBean demoBean = context.getBean(DemoBean.class);
        System.out.println(demoBean.getContent());

        context.close();
    }

}

5、事件（为bean与bean消息通信提供支持）

package com.zhen.highlights_spring4.ch2.event;

import org.springframework.context.ApplicationEvent;

/**
 * @author zhen
 * @Date 2018/6/12 13:31
 */
public class DemoEvent extends ApplicationEvent {

    private static final long serialVersionUID = 6639236243302861037L;

    private String msg;

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public DemoEvent(Object source, String msg) {
        super(source);
        this.msg = msg;
    }
}
package com.zhen.highlights_spring4.ch2.event;

import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

/**
 * @author zhen
 * @Date 2018/6/12 13:34
 */
@Component
public class DemoListener implements ApplicationListener<DemoEvent> {
    @Override
    public void onApplicationEvent(DemoEvent demoEvent) {
        String msg = demoEvent.getMsg();
        System.out.println("我(bean-demoListener)接收到了bean-demoPublisher发布的信息：" + msg);
    }
}
package com.zhen.highlights_spring4.ch2.event;

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

/**
 * @author zhen
 * @Date 2018/6/12 13:36
 */
@Component
public class DemoPublisher {
    @Autowired
    ApplicationContext applicationContext;

    public void publish(String msg){
        applicationContext.publishEvent(new DemoEvent(this, msg));
    }
}
package com.zhen.highlights_spring4.ch2.event;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

/**
 * @author zhen
 * @Date 2018/6/12 13:37
 */
@Configuration
@ComponentScan("com.zhen.highlights_spring4.ch2.event")
public class EventConfig {
}
package com.zhen.highlights_spring4.ch2.event;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * @author zhen
 * @Date 2018/6/12 13:37
 */
public class Main {
    public static void main(String[] args){
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(EventConfig.class);
        DemoPublisher demoPublisher = context.getBean(DemoPublisher.class);
        demoPublisher.publish("hello application event");
        context.close();
    }
}