[Java知识库] 05-SpringBoot @ConfigurationProperties、@PropertySource、@Import

开发: C++知识库 Java知识库 JavaScript Python PHP知识库人工智能区块链大数据移动开发嵌入式开发工具数据结构与算法开发测试游戏开发网络协议系统运维
教程: HTML教程 CSS教程 JavaScript教程 Go语言教程 JQuery教程 VUE教程 VUE3教程 Bootstrap教程 SQL数据库教程 C语言教程 C++教程 Java教程 Python教程 Python3教程 C#教程
数码: 电脑笔记本显卡显示器固态硬盘硬盘耳机手机 iphone vivo oppo 小米华为单反装机图拉丁

-> Java知识库 -> 05-SpringBoot @ConfigurationProperties、@PropertySource、@Import -> 正文阅读

[Java知识库]05-SpringBoot @ConfigurationProperties、@PropertySource、@Import

1.@ConfigurationProperties和@PropertySource

如何使用Java读取到properties文件中的内容，并且把它封装到JavaBean中，以供随时使用

在这里插入图片描述

user1.properties

user.id=1
user.username=lucy
user.password=111222

1.传统方法

public static void  getProperties(){
        Properties pps = new Properties();
        try {
            pps.load(new FileInputStream("D:\\java-oxygen\\IDEA CODE\\springboottest1\\src\\main\\resources\\user1.properties"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        Enumeration enum1 = pps.propertyNames();//得到配置文件的名字
        while(enum1.hasMoreElements()) {
            String strKey = (String) enum1.nextElement();
            String strValue = pps.getProperty(strKey);
            System.out.println(strKey + "=" + strValue);
            //封装到JavaBean。
            //......
        }
    }

在这里插入图片描述
这种传统方法真的很麻烦

2.注解方法

方法1.@ConfigurationProperties + @Component

User

package com.limi.entity;


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

//只有在容器中的组件，才会拥有SpringBoot提供的强大功能
@Component
@ConfigurationProperties(prefix = "user")
public class User {

    private Integer id;

    private String userName;

    private String passWord;

    public User(){}

    public User(Integer id, String userName, String passWord) {
        this.id = id;
        this.userName = userName;
        this.passWord = passWord;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", passWord='" + passWord + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }
}

如果属性值不在application.properties中, 则需使用@PropertySources导入properties文件
MyConfig

package com.limi.config;


import com.limi.entity.User;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;


@Configuration
// 默认取application.properties, 需要读取多个properties可以用@PropertySources设置
@PropertySource(value = {"user1.properties"})
public class MyConfig {

    @Bean
    public User user1(){
        return new User();
    }
}

MainApplication

package com.limi;

import com.limi.entity.User;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;


@SpringBootApplication
public class MainApplication {

    public static void main(String[] args) {

        //1、返回我们IOC容器
        ConfigurableApplicationContext run = SpringApplication.run(MainApplication.class, args);

        User user1 = (User)run.getBean("user1");
        System.out.println(user1);

    }
}

在这里插入图片描述

方法2.@EnableConfigurationProperties + @ConfigurationProperties

User

package com.limi.entity;

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

@ConfigurationProperties(prefix = "user")
public class User {

    private Integer id;

    private String userName;

    private String passWord;

    public User(){}

    public User(Integer id, String userName, String passWord) {
        this.id = id;
        this.userName = userName;
        this.passWord = passWord;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", passWord='" + passWord + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }
}

MyConfig

package com.limi.config;


import com.limi.entity.User;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;


@Configuration
@EnableConfigurationProperties(User.class)
// 默认取application.properties, 需要读取多个properties可以用@PropertySources设置
@PropertySource(value = {"user1.properties"})
public class MyConfig {

    @Bean
    public User user1(){
        return new User();
    }
}

MainApplication

package com.limi;

import com.limi.entity.User;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;


@SpringBootApplication
public class MainApplication {

    public static void main(String[] args) {

        //1、返回我们IOC容器
        ConfigurableApplicationContext run = SpringApplication.run(MainApplication.class, args);

        User user1 = (User)run.getBean("user1");
        System.out.println(user1);

    }
}

在这里插入图片描述

2.@Import

这个注解的功能就是将某个类创建为组件导入到IOC容器中

@Bean、@Component、@Controller、@Service、@Repository，它们是Spring的基本标签，在Spring
Boot中并未改变它们原来的功能。
@Import({User.class, DBHelper.class})给容器中自动创建出这两个类型的组件、默认组件的名字就是全类名

User

package com.limi.entity;

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

@ConfigurationProperties(prefix = "user")
public class User {

    private Integer id;

    private String userName;

    private String passWord;

    public User(){}

    public User(Integer id, String userName, String passWord) {
        this.id = id;
        this.userName = userName;
        this.passWord = passWord;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", passWord='" + passWord + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }
}

MyConfig

package com.limi.config;


import com.limi.entity.User;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;


@Configuration
@EnableConfigurationProperties(User.class)
// 默认取application.properties, 需要读取多个properties可以用@PropertySources设置
@PropertySource(value = {"user1.properties"})
@Import(User.class)
public class MyConfig {

}

MainApplication

package com.limi;

import com.limi.entity.User;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;


@SpringBootApplication
public class MainApplication {

    public static void main(String[] args) {

        //1、返回我们IOC容器
        ConfigurableApplicationContext run = SpringApplication.run(MainApplication.class, args);

        User user1 = (User)run.getBean("com.limi.entity.User");
        System.out.println(user1);

    }
}

在这里插入图片描述

3.项目完整代码

在这里插入图片描述
application.properties

# 设置端口号,如果不设置,默认是8080
server.port=8081

user1.properties

user.id=1
user.username=lucy
user.password=111222

User

package com.limi.entity;

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

@ConfigurationProperties(prefix = "user")
public class User {

    private Integer id;

    private String userName;

    private String passWord;

    public User(){}

    public User(Integer id, String userName, String passWord) {
        this.id = id;
        this.userName = userName;
        this.passWord = passWord;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", passWord='" + passWord + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }
}

MyConfig

package com.limi.config;


import com.limi.entity.User;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;


@Configuration
@EnableConfigurationProperties(User.class)
// 默认取application.properties, 需要读取多个properties可以用@PropertySources设置
@PropertySource(value = {"user1.properties"})
@Import(User.class)
public class MyConfig {

}

MainApplication

package com.limi;

        import com.limi.entity.User;
        import org.springframework.boot.SpringApplication;
        import org.springframework.boot.autoconfigure.SpringBootApplication;
        import org.springframework.context.ConfigurableApplicationContext;

        import java.io.FileInputStream;
        import java.io.IOException;
        import java.util.Enumeration;
        import java.util.Properties;


@SpringBootApplication
public class MainApplication {

    public static void main(String[] args) {

        //1、返回我们IOC容器
        ConfigurableApplicationContext run = SpringApplication.run(MainApplication.class, args);

        User user1 = (User)run.getBean("com.limi.entity.User");
        System.out.println(user1);

    }
}

Java知识库最新文章

计算距离春节还有多长时间

系统开发系列之WebService（spring框架+ma

springBoot+Cache(自定义有效时间配置)

SpringBoot整合mybatis实现增删改查、分页查

spring教程

SpringBoot+Vue实现美食交流网站的设计与实

加:2022-06-16 21:31:54 更:2022-06-16 21:32:22

360图书馆购物三丰科技阅读网日历万年历 2024年5日历

-2024/5/18 6:13:11-

图片自动播放器
↓图片自动播放器↓

TxT小说阅读器
↓语音阅读,小说下载,古典文学↓

一键清除垃圾
↓轻轻一点,清除系统垃圾↓

图片批量下载器
↓批量下载图片,美女图库↓

网站联系: qq:121756557 email:121756557@qq.com IT数码