SpringBoot进行属性的注入，list，map,arr，和其他的属性的注入

Posted 2021-09-05 SmallCuteMonkey

SpringBoot属性注入方式

总结：使用两种方式进行注入：
1.

@Value注解 加上@Configuration 让SpringBoot识别该类，

在Application.yml文件中的注入
写上注入的东西，注入的类User上面加上@ConfigurationPropertes(prefix=“nt”),@Configuration然后测试的类上面加上@EnableConfigurationProperties(User.class)

1.创建SpringBoot和环境

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>

        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
 <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.3.8</version>
            <scope>test</scope>

启动类的导入：

package com.hou;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan("com.hou.dao")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}

application.yml文件中加入

nt:
  id: 1
  username: hou
  password: roothouzhicong
  arrs: 1,2,3,4,5
  map:
    key1: aaa
    key2: bbb
  list:
    - hhhhhhhhh
    - aaaaaaa
    - cccccccc

com.hou.properties包下创建类：

package com.hou.properties;


import lombok.Data;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;

@Data
@Configuration //相当于一个xml文件的配置
//不加上Configuration会报错  Error creating bean with name 'com.hou.properties.TestTeacher'
public class Teacher {
    @Value("孔子")
    String name;
    @Value("论语")
    String course;


}

package com.hou.properties;


import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Configuration;

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

@Configuration
@ConfigurationProperties(prefix = "nt")
@Data
public class User {

    int id;
    String username;
    String password;
    Integer[] arrs;
    List<String> list;
    Map<String,String> map;

}

package com.hou.properties;


import com.hou.Application;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;

@RunWith(SpringRunner.class)
//测试的时候要启动类运行
@SpringBootTest(classes = Application.class)

@EnableConfigurationProperties(User.class)
public class TestTeacher {
    @Resource
    private  Teacher teacher;

    @Autowired
    private User user;



    @Test
    public void test(){


        System.out.println(teacher);
    }
    @Test
    public void testUser(){


        System.out.println(user);
    }
}