SpringBoot框架(2)--配置文件

1、添加新项目，选择Spring Initializr方式创建项目

2、默认配置读取顺序 -- /config/路径下优先，properties 比 yml 优先

注意：默认读取的配置文件必须命名为：application，否者读取不到

2.1 通过Environment方式读取

/resources/application.properties文件

1 local.ip.addr=192.168.3.110-pro

 1 package com.demo.boot.bootconfig;  2   3 import org.springframework.boot.SpringApplication;  4 import org.springframework.boot.autoconfigure.SpringBootApplication;  5 import org.springframework.context.ConfigurableApplicationContext;  6 import org.springframework.core.env.Environment;  7   8 @SpringBootApplication  9 public class BootConfigApplication { 10  11     public static void main(String[] args) { 12         ConfigurableApplicationContext context = SpringApplication.run(BootConfigApplication.class, args); 13         Environment env = context.getEnvironment(); 14         String ip = env.getProperty("local.ip.addr"); 15         String currentDir = env.getProperty("user.dir"); 16         System.out.println(ip + "," + currentDir); 17         context.close(); 18     } 19  20 }

2.2 通过@value方式读取配置

==>application.properties配置

1 redis.port=9966 2 redis.host:192.168.3.145 3 redis.auth:redis-01

RedisConfig

 1 package com.demo.boot.bootconfig;  2   3 import org.springframework.beans.factory.annotation.Value;  4 import org.springframework.stereotype.Component;  5   6 @Component  7 public class RedisConfig {  8     @Value("${redis.port:80}")//默认值:80  9     private int port; 10  11     @Value("${redis.host:127.0.0.1}")//默认值:127.0.0.1 12     private String host; 13  14     @Value("${redis.auth:321}")//默认值:321 15     private String auth; 16  17     public int getPort() { 18         return port; 19     } 20  21     public void setPort(int port) { 22         this.port = port; 23     } 24  25     public String getHost() { 26         return host; 27     } 28  29     public void setHost(String host) { 30         this.host = host; 31     } 32  33     public String getAuth() { 34         return auth; 35     } 36  37     public void setAuth(String auth) { 38         this.auth = auth; 39     } 40  41     public void showConfig() { 42         System.out.print(host + ":" + port + "," + auth + "\n"); 43     } 44  45 }

1 public static void main(String[] args) { 2         ConfigurableApplicationContext context = SpringApplication.run(BootConfigApplication.class, args); 3  4         //通过@Value方式读取配置 5         RedisConfig redisConfig = context.getBean(RedisConfig.class); 6         redisConfig.showConfig(); 7         context.close(); 8     }

输出：192.168.3.145:9966,redis-01

2.3 通过@ConfigurationProperties方式读取配置

==>application.properties文件添加以下内容

1 boot.datasource.driverClassName = com.mysql.jdbc.Driver 2 boot.datasource.url = jdbc:mysql:///db 3 boot.datasource.username = root 4 boot.datasource.password = 456

==>创建实体类：DatasourceProperties.java

 1 package com.demo.boot.bootconfig;  2   3 import org.springframework.boot.context.properties.ConfigurationProperties;  4 import org.springframework.stereotype.Component;  5   6 @Component  7 @ConfigurationProperties(prefix = "boot.datasource")  8 public class DatasourceProperties {  9     private String driverClassName; 10     private String url; 11     private String userName; 12     private String password; 13  14     public String getDriverClassName() { 15         return driverClassName; 16     } 17  18     public void setDriverClassName(String driverClassName) { 19         this.driverClassName = driverClassName; 20     } 21  22     public String getUrl() { 23         return url; 24     } 25  26     public void setUrl(String url) { 27         this.url = url; 28     } 29  30     public String getUserName() { 31         return userName; 32     } 33  34     public void setUserName(String userName) { 35         this.userName = userName; 36     } 37  38     public String getPassword() { 39         return password; 40     } 41  42     public void setPassword(String password) { 43         this.password = password; 44     } 45  46     @Override 47     public String toString() { 48         return "DatasourceProperties{" + 49                 "driverClassName='" + driverClassName + '\'' + 50                 ", url='" + url + '\'' + 51                 ", userName='" + userName + '\'' + 52                 ", password='" + password + '\'' + 53                 '}'; 54     } 55 }

==>main方法调用

1 public static void main(String[] args) { 2         ConfigurableApplicationContext context = SpringApplication.run(BootConfigApplication.class, args); 3  4         //通过@ConfigurationProperties方式 5         DatasourceProperties dbConfig = context.getBean(DatasourceProperties.class); 6         System.out.println(dbConfig); 7  8         context.close(); 9     }

输出：DatasourceProperties{driverClassName='com.mysql.jdbc.Driver', url='jdbc:mysql:///db', userName='root', password='456'}

3、指定配置文件（.properties > .yml）

资源文件结构

/config/app.yml文件添加一下内容

1 redis: 2   auth: redis-02 3   host: 192.168.3.150 4   port: 6680

运行上面的main方法

输出结果：192.168.3.150:6680,redis-02

3、指定多个配置文件

3.1 设置指定配置文件

3.2 config/app.yml文件添加以下内容

1 redis: 2   auth: redis-03 3   host: 192.168.3.450 4   port: 6880

1 redis.appName=springBoot

 1  public static void main(String[] args) {  2         ConfigurableApplicationContext context = SpringApplication.run(BootConfigApplication.class, args);  3         //通过Evironment方式读取配置  4         Environment env = context.getEnvironment();   5   6         String port = env.getProperty("redis.port");  7         String host = env.getProperty("redis.host");  8         String auth = env.getProperty("redis.auth");  9         String appName = env.getProperty("redis.appName"); 10  11         System.out.println(appName + "-->" + host + ":" + port + "," + auth); 12         context.close(); 13     }

输出结果：springBoot-->192.168.3.450:6880,redis-03