springBoot 获取配置文件里的值

通过spring容器获取配置文件中的参数

package com.boot.config.bootconfig;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;
@SpringBootApplication
public class BootConfigApplication {
    public static void main(String[] args) {
        //通过spring容器获取环境对象
        ConfigurableApplicationContext context = SpringApplication.run(BootConfigApplication.class, args);
        ConfigurableEnvironment environment = context.getEnvironment();
        String property = environment.getProperty("local.ip.addr");
        System.out.println(environment.getProperty("user.dir"));
        System.out.println(environment.getProperty("local.ip.root"));
        System.out.println(property);
    }
}

通过@Value方法读取配置文件中的参数

springBoot默认是读取resources下文件名为application.properties或者application.yml的文件，那如何读取文件名不是application的配置文件呢？方法如下：

在运行的时候指定参数的方式

在jvm里配置需要使用-D

通过@ConfigurationProperties注解读取配置文件中的值，一般都是使用这种方式

application.properties 文件内容：

local.ip.addr = 192.168.2.110
local.ip.root= root
greey.datasource.driverClassName=com.mysql.jdbc.Driver
greey.datasource.url=jdbc:mysql://123
greey.datasource.username=root
greey.datasource.password=torey123

装载的实体类：DataSourceProperties.java

package com.boot.config.bootconfig;

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

/**
 * @ClassName：DataSourceProperties
 * @Description：
 * @author: Torey
 */
@Component
@ConfigurationProperties(prefix = "greey.datasource")
public class DataSourceProperties {
    //一般情况下都是用这种方法读取的
    private String driverClassName;
    private String url;
    private String username;
    private String password;

    @Override
    public String toString() {
        return "DataSourceProperties{" +
                "driverClassName='" + driverClassName + '\'' +
                ", url='" + url + '\'' +
                ", username='" + username + '\'' +
                ", password='" + 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;
    }
}

调用的地方

package com.boot.config.bootconfig;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;

@SpringBootApplication
public class BootConfigApplication {
    public static void main(String[] args) {
        //通过spring容器获取环境对象
        ConfigurableApplicationContext context = SpringApplication.run(BootConfigApplication.class, args);
        ConfigurableEnvironment environment = context.getEnvironment();
        //通过ConfigurationProperties方式读取
        System.out.println("===通过ConfigurationProperties方式读取===");
        System.out.println(context.getBean(DataSourceProperties.class));
        context.close();
    }
}

在运行时，读取多个文件

–spring.config.location=classpath:conf/app.yml,classpath:conf/app1.properties 或者用
-Dspring.config.location=classpath:conf/app.yml,classpath:conf/app1.properties