springboot讀取配置文件的三種方式

方式一：

@Configuration

//@PropertySource("classpath:jdbc.properties")

//@PropertySource("classpath:config/jdbc222222.properties")

@PropertySources({@PropertySource("classpath:jdbc.properties"),@PropertySource("classpath:config/jdbc222222.properties")})

public class FileConfig {

}

@Component

public class Dbconfig {

@Value("${db.url}")

private String dbUrl;

@Value("${db.port}")

private Integer dbPort;

@Value("${db.password}")

private String dbPassword;

@Value("${db.username}")

private String dbUserName;

public void show(){

System.out.println(">>>>>>>>>>>Dbconfigz中獲取到的參數");

System.out.println("dbUrl========="+dbUrl);

System.out.println("dbPort"+ "========="+dbPort);

System.out.println("dbPassword"+ "========="+dbPassword);

System.out.println("dbUserName"+ "========="+dbUserName);

}

}

配置文件的信息，配置文件的名稱是jdbc.properties。路徑是在resources下

db.password=root

db.username=root

data.url=127.0.0.12

data.port=12343

data.name=1233

data.password=root3

測試的主方式是:

public static void main(String[] args) {

ConfigurableApplicationContext context = SpringApplication.run(App.class, args);

context.getBean(Runnable.class).run();

//String property = context.getEnvironment().getProperty("local.ip");

//System.out.println("獲取到的參數是:"+property);

//context.getBean(UserConfig.class).show();

context.getBean(Dbconfig.class).show();

context.getBean(DataSourceProperties.class).show();

context.close();

}

方式二:通過environment獲取外部的配置信息

@Component

public class UserConfig {

@Autowired

Environment environment;

@Value("${local.port}")

private String localPort;

@Value("${local.port}")

private Integer localPort2;

@Value("${tomcat.port:9090}")

private String tomcatPort;

public void show(){

System.out.println("application.properties中的local.ip的值:"+environment.getProperty("local.ip"));

System.out.println("application.properties中的local.port的值:"+environment.getProperty("local.port"));

System.out.println("application.properties中的local.port的值:"+environment.getProperty("local.port", Integer.class));

System.out.println("application.properties中的name的值:"+environment.getProperty("name"));

System.out.println("application.properties中的app.name的值:"+environment.getProperty("app.name"));

System.out.println("application.properties中的tomcat.port的值:"+environment.getProperty("tomcat.port"));

System.out.println("application.properties中的tomcat.port的值:"+tomcatPort);

}

}

方式三:

@Component

@ConfigurationProperties(prefix="data")

public class DataSourceProperties {

private String url;

private String port;

private String name;

private String password;

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

public String getPort() {

return port;

}

public void setPort(String port) {

this.port = port;

}

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;

}

public void show(){

System.out.println(">>>>>>>>>>>>url"+url);

System.out.println(">>>>>>>>>>>>port"+port);

System.out.println(">>>>>>>>>>>>name"+name);

System.out.println(">>>>>>>>>>>>password"+password);

}

}

總的說明:

 * 兩種方法獲取配置信息中的信息

 * 配置文件的文件名字為application.properties

 * 默認的位置在classpath根目錄，或者classpath:/config file:/ file:config/

 * 

 * 默認的配置文件名字可以使用 --spring.config.name來指定，只需要指定文件的名字，文件擴展名可以省略。

 * 默認的配置文件路徑可以使用--spring.config.location來指定，

 * 配置文件需要指定全路徑，包括目錄和文件名字，還可以指定多個，多個用逗號隔開

 * --spring.config.location=classpath:config/app.properties(如果是文件則file:文件的路徑)

 * 

spring boot 支持獲取數組，集合的配置

package com.zcp.springstart;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

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

import org.springframework.stereotype.Component;

/**

 * 支持獲取數組，集合

 * 配置方式為:name[index]=value

 * 在application.properties文件中的寫法:

 * data.url=127.0.0.1

data.port=1234

data.name=123

data.password=root.post

ds.hosts[0]=128.128.128.0

ds.hosts[1]=128.128.128.1

ds.hosts[2]=128.128.128.2

ds.hosts[3]=128.128.128.3

ds.ports[0]=8888

ds.ports[1]=8889

ds.ports[2]=8890

ds.ports[3]=8891

ds.ports[4]=8892

 * <p>Title: TomcatProperties</p>

 * <p>Description: </p>

 * <p>Company: www.itcast.cn</p> 

 * @version 1.0

 */

@Component

@ConfigurationProperties("ds")

public class TomcatProperties {

private List<String> hosts = new ArrayList<>();

private String[] ports;

public String[] getPorts() {

return ports;

}

public void setPorts(String[] ports) {

this.ports = ports;

}

public List<String> getHosts() {

return hosts;

}

public void setHosts(List<String> hosts) {

this.hosts = hosts;

}

@Override

public String toString() {

return "TomcatProperties [hosts=" + hosts + ", ports=" + Arrays.toString(ports) + "]";

}

}

在application.properties文件中的配置信息入下:

data.url=127.0.0.1

data.port=1234

data.name=123

data.password=root.post

ds.hosts[0]=128.128.128.0

ds.hosts[1]=128.128.128.1

ds.hosts[2]=128.128.128.2

ds.hosts[3]=128.128.128.3

ds.ports[0]=8888

ds.ports[1]=8889

ds.ports[2]=8890

ds.ports[3]=8891

ds.ports[4]=8892

測試的主方式是:

public static void main(String[] args) {

ConfigurableApplicationContext context = SpringApplication.run(App.class, args);

context.getBean(Runnable.class).run();

//String property = context.getEnvironment().getProperty("local.ip");

//System.out.println("獲取到的參數是:"+property);

//context.getBean(UserConfig.class).show();

//context.getBean(Dbconfig.class).show();

//context.getBean(DataSourceProperties.class).show();

System.out.println(context.getBean(TomcatProperties.class));

context.close();

}