SpringBoot加载配置文件的几种方式（加载JDBC配置文件）

淩亂°似流年 2023-07-03 12:08 35阅读 0赞

# 学习SpringBoot我们会使用JDBC来加载JDBC配置文件，这是有几种方式来进行文件的加载 #

**Table of Contents**

学习SpringBoot我们会使用JDBC来加载JDBC配置文件，这是有几种方式来进行文件的加载

前提：添加pom依赖

1:使用@PropertySource加载自定义配置文件。

2：@ConfigurationProperties注解的使用：一次加载到处使用。

3:@ConfigurationProperties的使用优化：

4：使用SpringBoot默认方式加载数据源（HikariDataSource）

5:SpringBoot中使用自己配置的数据源

--------------------

## 前提：添加pom依赖 ##

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.4.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.bjsxt</groupId>
        <artifactId>springbootjdbc</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>springbootjdbc</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jdbc</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.12</version>
            </dependency>
    
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.38</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

## 1:使用@PropertySource加载自定义配置文件。 ##

1.1：首先创建配置文件，设置配置文件的内容，我这里写的是连接数据库信息。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70][]

1.2：创建加载配置类。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 3][]

package com.bjsxt.springbootjdbc.config;
    
    import com.alibaba.druid.pool.DruidDataSource;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    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;
    
    import javax.sql.DataSource;
    
    @Configuration
    //1.
    @PropertySource("classpath:/jdbc.properties")
    //2.
    // @EnableConfigurationProperties(JdbcProperties.class)
    public class JdbcConfiguration {
        /* //2:
        @Autowired
        private JdbcProperties jdbcProperties;
        */
    
    
        //1:
        @Value("${jdbc.driverClassName}")
        private String driverClassName;
    
        @Value("${jdbc.url}")
        private String url;
    
        @Value("${jdbc.username}")
        private String username;
    
        @Value("${jdbc.password}")
        private String password;
    
        //3
        // @ConfigurationProperties(prefix = "jdbc")
        @Bean
        public DataSource getDataSource(){
            DruidDataSource dataSource=new DruidDataSource();
            dataSource.setDriverClassName(this.driverClassName);
            dataSource.setUrl(this.url);
            dataSource.setUsername(this.username);
            dataSource.setPassword(this.password);
            return dataSource;
        }
    }

1.3：创建控制器，打断点查看配置信息。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 4][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 5][]

这样做有一些缺点，如果多次需要使用配置信息，我们都需要这样一步一步的来，代码就会十分的冗余。为此就有了第二种注解使用的方式。

## 2：@ConfigurationProperties注解的使用：一次加载到处使用。 ##

在使用前我们需要知道，**@ConfigurationProperties只能读取SpringBoot的Application的配置文件进行数据的读取加载的**。

**2.1：将数据配置文件复制到application.properties的文件中去**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 6][]

**2.2：创建一个专门用于加载该配置的类。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 7][]

package com.bjsxt.springbootjdbc.config;
    
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    
    
    //2.
     @ConfigurationProperties(prefix = "jdbc")
    //只能读取springBoot Application注解文件
    public class JdbcProperties {
    
        private String driverClassName;
    
        private String url;
    
        private String username;
    
        private String password;
    
        public String getDriverClassName() {
            return driverClassName;
        }
    
        public void setDriverClassName(String driverClassName) {
            this.driverClassName = driverClassName;
        }
    
        public String getUrl() {
            return url;
        }
    
        public void setUrl(String url) {
            this.url = url;
        }
    
        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;
        }
    }

**2.3：修改1.2的配置类。通过注入2.2专门加载配置类来通过get方法进行获取**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 8][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 9][]

package com.bjsxt.springbootjdbc.config;
    
    import com.alibaba.druid.pool.DruidDataSource;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    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;
    
    import javax.sql.DataSource;
    
    @Configuration
    //1.
    //@PropertySource("classpath:/jdbc.properties")
    //2.
    @EnableConfigurationProperties(JdbcProperties.class)
    public class JdbcConfiguration {
        //2:
        @Autowired
        private JdbcProperties jdbcProperties;
    
    
        /*
        //1:
        @Value("${jdbc.driverClassName}")
        private String driverClassName;
    
        @Value("${jdbc.url}")
        private String url;
    
        @Value("${jdbc.username}")
        private String username;
    
        @Value("${jdbc.password}")
        private String password;
    
        */
    
        //3
        // @ConfigurationProperties(prefix = "jdbc")
        @Bean
        public DataSource getDataSource(){
            DruidDataSource dataSource=new DruidDataSource();
            dataSource.setDriverClassName(this.jdbcProperties.getDriverClassName());
            dataSource.setUrl(this.jdbcProperties.getUrl());
            dataSource.setUsername(this.jdbcProperties.getUsername());
            dataSource.setPassword(this.jdbcProperties.getPassword());
            return dataSource;
        }
    }

**2.4：测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 10][]

![20200206141346200.png][]

## 3:@ConfigurationProperties的使用优化： ##

**3.1：取消该专门加载配置类注解**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 11][]

package com.bjsxt.springbootjdbc.config;
    
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    
    
    //2.
    // @ConfigurationProperties(prefix = "jdbc")
    //只能读取springBoot Application注解文件
    public class JdbcProperties {
    
        private String driverClassName;
    
        private String url;
    
        private String username;
    
        private String password;
    
        public String getDriverClassName() {
            return driverClassName;
        }
    
        public void setDriverClassName(String driverClassName) {
            this.driverClassName = driverClassName;
        }
    
        public String getUrl() {
            return url;
        }
    
        public void setUrl(String url) {
            this.url = url;
        }
    
        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;
        }
    }

**3.2：取消加载配置类，在该方法直接开启读取配置文件**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 12][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 13][]

package com.bjsxt.springbootjdbc.config;
    
    import com.alibaba.druid.pool.DruidDataSource;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    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;
    
    import javax.sql.DataSource;
    
    @Configuration
    //1.
    //@PropertySource("classpath:/jdbc.properties")
    //2.
    //@EnableConfigurationProperties(JdbcProperties.class)
    public class JdbcConfiguration {
        //2:
        /*
        @Autowired
        private JdbcProperties jdbcProperties;
        */
    
    
        /*
        //1:
        @Value("${jdbc.driverClassName}")
        private String driverClassName;
    
        @Value("${jdbc.url}")
        private String url;
    
        @Value("${jdbc.username}")
        private String username;
    
        @Value("${jdbc.password}")
        private String password;
    
        */
    
        //3
        @ConfigurationProperties(prefix = "jdbc")
        @Bean
        public DataSource getDataSource(){
            DruidDataSource dataSource=new DruidDataSource();
            /*
            dataSource.setDriverClassName(this.jdbcProperties.getDriverClassName());
    
            dataSource.setUrl(this.jdbcProperties.getUrl());
            dataSource.setUsername(this.jdbcProperties.getUsername());
            dataSource.setPassword(this.jdbcProperties.getPassword());
             */
            return dataSource;
        }
    }

3.3：测试：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 14][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 15][]

## 4：使用SpringBoot默认方式加载数据源（HikariDataSource） ##

**4.1：配置application.properties**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 16][]

**4.2:是注解配置类无效**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 17][]

package com.bjsxt.springbootjdbc.config;
    
    import com.alibaba.druid.pool.DruidDataSource;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    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;
    
    import javax.sql.DataSource;
    
    //4.
    // @Configuration
    //1.
    //@PropertySource("classpath:/jdbc.properties")
    //2.
    //@EnableConfigurationProperties(JdbcProperties.class)
    public class JdbcConfiguration {
        //2:
        /*
        @Autowired
        private JdbcProperties jdbcProperties;
        */
    
    
        /*
        //1:
        @Value("${jdbc.driverClassName}")
        private String driverClassName;
    
        @Value("${jdbc.url}")
        private String url;
    
        @Value("${jdbc.username}")
        private String username;
    
        @Value("${jdbc.password}")
        private String password;
    
        */
    
        //3
        @ConfigurationProperties(prefix = "jdbc")
        @Bean
        public DataSource getDataSource(){
            DruidDataSource dataSource=new DruidDataSource();
            /*
            dataSource.setDriverClassName(this.jdbcProperties.getDriverClassName());
    
            dataSource.setUrl(this.jdbcProperties.getUrl());
            dataSource.setUsername(this.jdbcProperties.getUsername());
            dataSource.setPassword(this.jdbcProperties.getPassword());
             */
            return dataSource;
        }
    }

4.3：修改控制器代码，查看该类的位置：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 18][]

![20200206143053295.png][]

## 5:SpringBoot中使用自己配置的数据源 ##

**5.1：修改pom文件，添加Druid数据源**

![20200206143329664.png][]

**5.2：修改数据源类型**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 19][]

**5.3：重启项目进行测试：**

![20200206143646549.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200206135300579.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0,size_16,color_FFFFFF,t_70
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