Java笔记：Spring配置xml和注解（5）

<?xml version="1.0" encoding="utf-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"
>
    <!--开启包扫描-->
    <context:component-scan base-package="com.demo.ioc"/>
</beans>

package com.demo.ioc;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
// 创建配置文件,可以认为是一个xml配置文件
@Configuration
// 设置需要扫描的包
@ComponentScan(value = "com.demo.ioc")
public class MyConfiguration {
}
package com.demo.ioc;
import org.springframework.stereotype.Component;
// 增加注解后会被Spring扫描到, 默认的Id是类名首字母小写
@Component(value = "person")
public class Person {
}

<bean id="person" name="person1, person2" class="com.demo.ioc.Person"/>
<alias name="person" alias="person3"/>

package com.demo.ioc;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
// 创建配置文件,可以认为是一个xml配置文件
@Configuration
public class MyConfiguration {
    @Bean(name = {"person1", "person2"})
    public Person person(){
        return new Person();
    }
}

package com.demo.ioc;
import org.springframework.stereotype.Component;
@Component
public class Cat {
}
package com.demo.ioc;
import org.springframework.stereotype.Component;
@Component
public class Dog {
}
package com.demo.ioc;
import org.springframework.stereotype.Component;
@Component
public class Pig {
}

package com.demo.ioc;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
// 创建配置文件,可以认为是一个xml配置文件
@Configuration
@ComponentScan(value = "com.demo.ioc")
public class MyConfiguration {
    @Bean(name = "stringList")
    public List<String> stringList() {
        List<String> list = new ArrayList<>();
        list.add("Tom");
        list.add("Jack");
        return list;
    }
    // 此优先级高于 List<String>
    @Bean
    @Order(2) // 指定优先级
    public String string1(){
        return "string1";
    }
    @Bean
    @Order(1)
    public String string2(){
        return "string2";
    }
    @Bean
    public Map<String, Integer> stringIntegerMap(){
        Map<String, Integer> map = new HashMap<>();
        map.put("dog", 23);
        map.put("pig", 24);
        return map;
    }
    // 优先级高于 Map<String, Integer>
    @Bean
    public Integer integer1(){
        return 222;
    }
    @Bean
    public Integer integer2(){
        return 223;
    }
}

package com.demo.ioc;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;
import java.util.List;
import java.util.Map;
@Component
public class Person {
    private Dog dog;
    // 1、构造方法注入
    @Autowired
    public Person(Dog dog) {
        this.dog = dog;
    }
    private Cat cat;
    // 2、Set方法注入
    @Autowired
    public void setCat(Cat cat) {
        this.cat = cat;
    }
    // 3、通过属性注入
    @Autowired
    private Pig pig;
    private List<String> stringList;
    // 4、注入List类型
    @Autowired
    // 指定Bean的ID
    // @Qualifier(value = "stringList")
    public void setStringList(List<String> stringList) {
        this.stringList = stringList;
    }
    public List<String> getStringList() {
        return stringList;
    }
    // 5、Map类型注入
    private Map<String, Integer> stringIntegerMap;
    public Map<String, Integer> getStringIntegerMap() {
        return stringIntegerMap;
    }
    @Autowired
    public void setStringIntegerMap(Map<String, Integer> stringIntegerMap) {
        this.stringIntegerMap = stringIntegerMap;
    }
    private String name;
    // 6、String、Integer等类型直接赋值
    @Value("Tom") // 如果是Integer会自动转型
    public void setName(String name) {
        this.name = name;
    }
    // 7、容器内置接口注入
    private ApplicationContext context;
    @Autowired
    public void setContext(ApplicationContext context) {
        this.context = context;
    }
    public ApplicationContext getContext() {
        return context;
    }
    @Override
    public String toString() {
        return "Person{" +
                "dog=" + dog +
                ", cat=" + cat +
                ", pig=" + pig +
                ", stringList=" + stringList +
                ", stringIntegerMap=" + stringIntegerMap +
                ", name='" + name + '\'' +
                '}';
    }
}

package com.demo.ioc;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class BeanTest {
    @Test
    public void testBean() {
        // 获取上下文
        ApplicationContext context =
                new AnnotationConfigApplicationContext(MyConfiguration.class);
        // 获取Bean
        Person bean = context.getBean("person", Person.class);
        System.out.println(bean);
        System.out.println(bean.getStringList());
        System.out.println(bean.getStringIntegerMap());
        System.out.println(bean.getContext().getBean("cat"));
    }
}

Person{dog=com.demo.ioc.Dog@441772e, 
    cat=com.demo.ioc.Cat@7334aada, 
    pig=com.demo.ioc.Pig@1d9b7cce, 
    stringList=[string2, string1], 
    stringIntegerMap={integer1=222, integer2=223}, 
    name='Tom'
}
[string2, string1]
{integer1=222, integer2=223}
com.demo.ioc.Cat@7334aada