import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HelloWorld {
  public static void main(String[] args) {
    Logger logger = LoggerFactory.getLogger(HelloWorld.class);
    //geilongger是获取记录器的东西，获取类的信息
    logger.info("Hello World");
  }
}

package com.myblog.springboot;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBoot03LoggingApplicationTests {


Logger logger = LoggerFactory.getLogger(getClass());//创建日志记录的记录器
@Test
public void contextLoads() {
//System.out.println();

//日志的级别；trace<debug<info<warn<error
logger.trace("我是trace日志...");//跟踪信息时使用
logger.debug("我是debug日志...");//调试时使用
logger.info("我是info日志...");//自己定义的信息
logger.warn("我是warn日志...");//警告信息
logger.error("我是error日志...");//错误信息
        //SpringBoot默认使用的是info级别的【也称为root级别】，也就是在输出日志的时候，不会输出trace和debug级别的信息。
        //如果想设定级别，则可以在配置文件中使用logging.level来进行设置，类似设置我当前的包的级别为trace，则是如下所示
        //logging.level.com.myblog=trace

        //技巧：通过设置输入日志的级别，系统就只显示这个级别以上的日志信息，就不会一条条去注释日志语句了。
}
}

package com.myblog.springboot.bean;

import org.springframework.stereotype.Component;
import org.springframework.context.annotation.PropertySource;

import java.util.Date;
import java.util.List;
import java.util.Map;


@PropertySource(value = {"classpath:person.properties"})// 告诉springboot加载内路径下的person.properties的内容，并把他们绑定都到Person对象中
//加载指定的属性文件的配置到环境中
@Component
@ConfigurationProperties(prefix = "person")
//主配置中的属性映射到实体类中所对应的属性
public class Person {

    private String lastName;
    private Integer age;
    private Boolean boss;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

    @Override
    public String toString() {
        return "Person{" +
                "lastName='" + lastName + '\'' +
                ", age=" + age +
                ", boss=" + boss +
                ", birth=" + birth +
                ", maps=" + maps +
                ", lists=" + lists +
                ", dog=" + dog +
                '}';
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Boolean getBoss() {
        return boss;
    }

    public void setBoss(Boolean boss) {
        this.boss = boss;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    public Map<String, Object> getMaps() {
        return maps;
    }

    public void setMaps(Map<String, Object> maps) {
        this.maps = maps;
    }

    public List<Object> getLists() {
        return lists;
    }

    public void setLists(List<Object> lists) {
        this.lists = lists;
    }

    public Dog getDog() {
        return dog;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }
}

@Autowired
ApplicationContext ioc;  //注入ioc容器

@Test
public void testHelloService(){   // 测试容器中有无helloService
    boolean b = ioc.containsBean("helloService");
    System.out.println(b);
}

package com.myblog.springboot02.config;

import com.myblog.springboot02.service.HelloService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration  //指明当前类是一个配置类；就是来替代之前的Spring配置文件
public class MyAppConfig {

    @Bean  //将方法的返回值添加到容器中；容器中这个组件默认的id就是方法名
    public HelloService helloService(){     //容器中这个组件默认的id为helloService
        System.out.println("配置类@Bean给容器中添加组件了，运行成功！");
        return new HelloService();
    }
}

//Person.java
package com.myblog.springboot.bean;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * 将配置文件中配置的每一个属性的值，映射到这个组件中
 * @ConfigurationProperties：告诉SpringBoot将本类中的所有属性和配置文件中相关的配置进行绑定；
 *      prefix = "person"：配置文件中哪个下面的所有属性进行一一映射
 *
 * 只有这个组件是容器中的组件，才能容器提供的@ConfigurationProperties功能；
 *  @ConfigurationProperties(prefix = "person")默认从全局配置文件中获取值；
 *
 */
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
    private String lastName;
    private Integer age;
    private Boolean boss;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;
    @Override
    public String toString() {
        return "Person{" +
                "lastName='" + lastName + '\'' +
                ", age=" + age +
                ", boss=" + boss +
                ", birth=" + birth +
                ", maps=" + maps +
                ", lists=" + lists +
                ", dog=" + dog +
                '}';
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public Boolean getBoss() {
        return boss;
    }
    public void setBoss(Boolean boss) {
        this.boss = boss;
    }
    public Date getBirth() {
        return birth;
    }
    public void setBirth(Date birth) {
        this.birth = birth;
    }
    public Map<String, Object> getMaps() {
        return maps;
    }
    public void setMaps(Map<String, Object> maps) {
        this.maps = maps;
    }
    public List<Object> getLists() {
        return lists;
    }
    public void setLists(List<Object> lists) {
        this.lists = lists;
    }
    public Dog getDog() {
        return dog;
    }
    public void setDog(Dog dog) {
        this.dog = dog;
    }
}

//Dog.java
package com.myblog.springboot.bean;
public class Dog {
    private String name;
    private Integer age;
    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
}

package com.myblog.springboot;

import com.myblog.springboot.bean.Person;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)   //用SpringRunner驱动器来跑
@SpringBootTest    //SpringBoot单元测试;
public class SpringBoot02ConfigApplicationTests {

@Autowired
Person person;

@Test
public void contextLoads() {
System.out.println(person);
}

}

package com.myblog.springboot.bean;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import org.springframework.beans.factory.annotation.Value;

import java.util.Date;
import java.util.List;
import java.util.Map;

@Component

public class Person {
    /**
     * <bean class="Person">
     *      <property name="lastName" value="字面量/${key}从环境变量、配置文件中获取值/#{SpEL}spring的表达式语言"></property>
     * <bean/>
     */
    @Value("${person.last-name}")   //从环境变量、配置文件中获取值
    private String lastName;
    @Value("#{11*2}")    //表达式文件
    private Integer age;
    @Value("true")     //字面量
    private Boolean boss;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

    @Override
    public String toString() {
        return "Person{" +
                "lastName='" + lastName + '\'' +
                ", age=" + age +
                ", boss=" + boss +
                ", birth=" + birth +
                ", maps=" + maps +
                ", lists=" + lists +
                ", dog=" + dog +
                '}';
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Boolean getBoss() {
        return boss;
    }

    public void setBoss(Boolean boss) {
        this.boss = boss;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    public Map<String, Object> getMaps() {
        return maps;
    }

    public void setMaps(Map<String, Object> maps) {
        this.maps = maps;
    }

    public List<Object> getLists() {
        return lists;
    }

    public void setLists(List<Object> lists) {
        this.lists = lists;
    }

    public Dog getDog() {
        return dog;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }
}

package com.myblog.springboot.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

//这个类的所有方法返回的数据直接写给浏览器，（如果是对象转为json数据）
/*@ResponseBody        // 因为很多方法都可能要用到，所以放到前面，说明这这个类的所有方法返回的数据直接写给浏览器，（如果是对象转为json数据）
@Controller*/
@RestController   //在spring4.2版本以后，已经包含了 ResponseBody 和Controllers
public class HelloController {


    @RequestMapping("/hello")  //收到hello请求
    public String hello(){
        return "hello world quick!";
    }

    // RESTAPI的方式
}

package com.myblog;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 *  @SpringBootApplication 标注一个主程序类，说明这是一个Spring Boot应用
 */
@SpringBootApplication
public class HelloWorldMainApplication {
    public static void main(String[] args) {

        // 启动Spring应用
        SpringApplication.run(HelloWorldMainApplication.class,args);
    }
}

package com.myblog.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class HelloController {
    @ResponseBody
    @RequestMapping("/hello")   //接受来自浏览器的hello请求
    public String hello(){
        return "Hello World!";  //返回 Hello World!
    }
}