2021-12-7 springboot(1)

1.springboot = spring + springmvc
2.常用框架配置好了
3.开发效率高

是spring提供的Java类配置容器，配置springIOC容器的纯Java方法。

放在类的上面，表示这个类作为配置文件使用

声明对象，把这个对象注入到容器之中。

创建student类：

package com.gizzard.vo;

public class Student {
    private String name;
    private Integer age;
    private String sex;

    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;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + ''' +
                ", age=" + age +
                ", sex='" + sex + ''' +
                '}';
    }
}

使用beans.xml方法：
在resources里面创建beans.xml

测试：

    @Test
    public void test01(){
        String config="beans.xml";
        ApplicationContext ctx = new ClassPathXmlApplicationContext(config);
        Student student = (Student) ctx.getBean("myStudent");
        System.out.println(student);
    }

使用JavaConfig方式：
创建SpringConfig类

package com.gizzard.config;

import com.gizzard.vo.Student;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
public class SpringConfig {

    
    @Bean
    public Student createStudent()  {
        Student s1 = new Student ();
        s1.setName("张三");
        s1.setAge(22);
        s1.setSex("男");
        return s1;
    }
    @Bean(name = "lisiStudent")
    public Student makeStudent()  {
        Student s1 = new Student ();
        s1.setName("lisi");
        s1.setAge(22);
        s1.setSex("男");
        return s1;
    }
}

测试：

@Test
    public void test02(){
        ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        Student student = (Student) ctx.getBean("createStudent");
        System.out.println(student);
    }
    @Test
    public void test03(){
        ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        Student student = (Student) ctx.getBean("lisiStudent");
        System.out.println(student);
    }

@ImporResource
在当作为配置文件的类中加入该注解可以将配置文件中的bean也加入到该类之中。

@Configuration
@importResource(value = "classpath:applicationContext.xml")
public class SpringConfig {

    
    @Bean
    public Student createStudent()  {
        Student s1 = new Student ();
        s1.setName("张三");
        s1.setAge(22);
        s1.setSex("男");
        return s1;
    }
    @Bean(name = "lisiStudent")
    public Student makeStudent()  {
        Student s1 = new Student ();
        s1.setName("lisi");
        s1.setAge(22);
        s1.setSex("男");
        return s1;
    }
}