config

最新推荐文章于 2024-05-01 21:51:21 发布

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最新推荐文章于 2024-05-01 21:51:21 发布

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本文链接：https://blog.youkuaiyun.com/weixin_42793833/article/details/89431088

后台框架同时被 3 个专栏收录

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spring boot

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配置文件

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本文详细介绍了SpringBoot中四种不同的配置文件加载方法，包括通过Value注解、ConfigurationProperties注解、Bean结合ConfigurationProperties以及使用ConfigurationProperties和EnableConfigurationProperties注解的方式。每种方法都附有代码示例，帮助读者理解如何在实际项目中应用。

spring boot加载配置文件

1.通过value("${}")

pom

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

application.yml

spring:
  application:
    name: configdemo
server:
  port: 8081
test:
  name: tom
  password: admin123

启动类

package com.zjb;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author zhaojianbo
 */
@SpringBootApplication
public class ConfigDemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConfigDemoApplication.class);
    }
}

dao层

package com.zjb.dao;

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

/**
 * @author zhaojianbo
 */
@Component
public class User {
    @Value("${test.name}")
    private String name;
    @Value("${test.password}")
    private String password;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

controller

package com.zjb.controller;

import com.zjb.dao.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author zhaojianbo
 */
@RestController
@RequestMapping("/config")
public class HelloController {

    @Autowired
    User user;

    @RequestMapping("hello")
    public String hello() {
        return user.toString();
    }
}

2.通过注解自动注入

pom

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

dao层

package com.zjb.dao;

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

/**
 * @author zhaojianbo
 */
@Component
@ConfigurationProperties(prefix = "test")
//如果是默认的配置文件则不用写PropertySource
@PropertySource("classpath:application.yaml")
//@ConfigurationProperties(locations = "classpath:application.yaml", prefix = "test")
public class Person {
    private String name;
    private String password;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

controller

package com.zjb.controller;

import com.zjb.dao.Person;
import com.zjb.dao.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author zhaojianbo
 */
@RestController
@RequestMapping("/config")
public class HelloController {

    @Autowired
    User user;

    @Autowired
    Person person;

    @RequestMapping("user")
    public String user() {
        return user.toString();
    }

    @RequestMapping("person")
    public String person() {
        return person.toString();
    }

}

3.通过Bean和ConfigurationProperties

@bean,表示的是一个bean，该注解放在方法上，方法表示为配置文件中的id，返回值表示配置文件中的class

dao层

package com.zjb.dao;

/**
 * @author zhaojianbo
 */
public class People {
    private String name;
    private String password;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "People{" +
                "name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

设置配置类

package com.zjb;

import com.zjb.dao.People;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;

/**
 * @author zhaojianbo
 */
@SpringBootApplication
public class ConfigDemoApplication {

    @Bean
    @ConfigurationProperties(prefix = "test")
    public People peopleInstance() {
        return new People();
    }

    public static void main(String[] args) {
        SpringApplication.run(ConfigDemoApplication.class);

    }
}

controller

package com.zjb.controller;

import com.zjb.dao.People;
import com.zjb.dao.Person;
import com.zjb.dao.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author zhaojianbo
 */
@RestController
@RequestMapping("/config")
public class HelloController {

    @Autowired
    User user;

    @Autowired
    Person person;

    @Autowired
    People people;

    @RequestMapping("user")
    public String user() {
        return user.toString();
    }

    @RequestMapping("person")
    public String person() {
        return person.toString();
    }

    @RequestMapping("people")
    public String people() {
        return people.toString();
    }

}

4.ConfigurationProperties以及EnableConfigurationProperties注解

当ConfigurationProperties没有与component一起使用时，ConfigurationProperties标注的类没有加载到容器中，EnableConfigurationProperties使类可以加载到容器中

dao类

package com.zjb.dao;

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

/**
 * @author zhaojianbo
 */
@ConfigurationProperties(prefix = "test")
public class Man {
    private String name;
    private String password;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "Man{" +
                "name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

controller

package com.zjb.controller;

import com.zjb.dao.Man;
import com.zjb.dao.People;
import com.zjb.dao.Person;
import com.zjb.dao.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author zhaojianbo
 */
@RestController
@RequestMapping("/config")
@EnableConfigurationProperties(Man.class)
public class HelloController {

    @Autowired
    User user;

    @Autowired
    Person person;

    @Autowired
    People people;

    @Autowired
    Man man;

    @RequestMapping("user")
    public String user() {
        return user.toString();
    }

    @RequestMapping("person")
    public String person() {
        return person.toString();
    }

    @RequestMapping("people")
    public String people() {
        return people.toString();
    }

    @RequestMapping("man")
    public String man() {
        return man.toString();
    }

}