1.      使用@Value

@Value("${swagger.enable}")

使用Spring的PropertyPlaceholderConfigurer关联 @Value

方法一：使用xml配置PropertyPlaceholderConfigurer，使用@ContextConfiguration导入配置文件

package com.properties.value;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import lombok.extern.slf4j.Slf4j;

//方法一：使用xml配置PropertyPlaceholderConfigurer，使用@ContextConfiguration导入配置文件

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration("classpath:applicationCtx.xml")

@Slf4j

public class ValueUsage1 {

    @Value("${username}")

    private String uname;

    @Value("${password}")

    private String pwd;

    @Test

    public void test(){

        log.info("username:"+uname);

        log.info("password:"+pwd);

    }

}
<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

        <!-- 对于读取一个配置文件采取的方案 -->

        <property name="location" value="classpath:cfg.properties"></property>

        <!-- 对于读取两个以上配置文件采取的处理方案 -->

        <!--

        <property name="locations">

            <list>

                <value>classpath:cfg.properties</value>

                <value>classpath:cfg2.properties</value>

            </list>

        </property>

        -->

    </bean>

</beans>
username=jay

password=123

env=${pom.env}

ver=${pom.ver}

方法二：使用@Bean实例化PropertySourcesPlaceholderConfigurer，@PropertySources导入资源

package com.properties.value;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

//方法二：使用@Bean实例化PropertySourcesPlaceholderConfigurer，@PropertySources导入资源

public class ValueUsage2 {

	public static void main(String[] args) {

		AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(PropertiesWithJavaConfig.class);

        FileService service = (FileService) annotationConfigApplicationContext.getBean("fileService");

        service.readValues();

        annotationConfigApplicationContext.close();

	}

}


package com.properties.value;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.PropertySource;

import org.springframework.context.annotation.PropertySources;

import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;

@Configuration

@PropertySources({ @PropertySource(value = "classpath:cfg.properties", ignoreResourceNotFound = true),

	@PropertySource(value = "classpath:application.properties", ignoreResourceNotFound = true) })

//==> @PropertySource("file:${app.home}/app.properties")	file指向绝对路径

@ComponentScan(basePackages = "com.properties.value")

public class PropertiesWithJavaConfig {

   //要想使用@Value 用${}占位符注入属性，这个bean是必须的，这个就是占位bean,另一种方式是不用value直接用Envirment变量直接getProperty('key')

   @Bean

   public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {

      return new PropertySourcesPlaceholderConfigurer();

   }

}


#springfox.documentation.swagger.v2.path=/api-docs

#server.contextPath=/v2

server.port=8080

swagger.enable=true

jdbc.driverClassName = com.mysql.jdbc.Driver

jdbc.url = jdbc:mysql://localhost:3306/websystique

jdbc.username = myuser

jdbc.password = mypassword

hibernate.dialect = org.hibernate.dialect.MySQLDialect

hibernate.show_sql = false

hibernate.format_sql = false

sourceLocation =/dev/input

destination =c\:/temp/output
username=jay

password=123

env=${pom.env}

ver=${pom.ver}

2.      使用Environment

@Autowired

private Environment environment;

environment.getProperty("swagger.enable")

方法一：@Inject或者@Autowired一个Environment对象

package com.properties.environment;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

//方法一：@Inject或者@Autowired一个Environment对象

public class EnvironmentUsage1 {

	public static void main(String[] args) {

		AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(PropertiesWithJavaConfig.class);

        FileService service = (FileService) annotationConfigApplicationContext.getBean("fileService");

        service.readValues();

        annotationConfigApplicationContext.close();

	}

}


package com.properties.environment;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.PropertySource;

@Configuration

@PropertySource(value = { "classpath:cfg.properties", "classpath:application.properties" })

@ComponentScan(basePackages = "com.properties.environment")

public class PropertiesWithJavaConfig {

}


package com.properties.environment;

public interface FileService {

	public void readValues();

}


package com.properties.environment;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.core.env.Environment;

import org.springframework.stereotype.Service;

@Service("fileService")

public class FileServiceImpl implements FileService {

	@Autowired

	private Environment environment;

	public void readValues() {

		System.out.println("Getting property via Spring Environment :" + environment.getProperty("jdbc.driverClassName"));

		System.out.println("Source Location : " + environment.getProperty("sourceLocation"));

		System.out.println("Destination Location : " + environment.getProperty("destination"));

	}

}


#springfox.documentation.swagger.v2.path=/api-docs

#server.contextPath=/v2

server.port=8080

swagger.enable=true

jdbc.driverClassName = com.mysql.jdbc.Driver

jdbc.url = jdbc:mysql://localhost:3306/websystique

jdbc.username = myuser

jdbc.password = mypassword

hibernate.dialect = org.hibernate.dialect.MySQLDialect

hibernate.show_sql = false

hibernate.format_sql = false

sourceLocation =/dev/input

destination =c\:/temp/output
username=jay

password=123

env=${pom.env}

ver=${pom.ver}

方法二：实现EnvironmentAware接口

package com.properties.environment;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.core.env.Environment;

//方法二：实现EnvironmentAware接口

@ComponentScan(basePackages = "com.properties.environment")

@SpringBootApplication

public class EnvironmentUsage2 {

	public static void main(String[] args) {

		AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext();

		annotationConfigApplicationContext.register(EnvironmentBean.class);

		annotationConfigApplicationContext.refresh();

		Environment environment = annotationConfigApplicationContext.getBean("environment2",Environment.class);

		System.out.println("Getting property via Spring Environment :" + environment.getProperty("jdbc.driverClassName"));

		System.out.println("Source Location : " + environment.getProperty("sourceLocation"));

		System.out.println("Destination Location : " + environment.getProperty("destination"));

		annotationConfigApplicationContext.close();

	}

}


package com.properties.environment;

import org.springframework.context.EnvironmentAware;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.PropertySource;

import org.springframework.core.env.Environment;

@Configuration

@PropertySource(value = { "classpath:cfg.properties", "classpath:application.properties" })

public class EnvironmentBean implements EnvironmentAware {

	private Environment environment2;

	@Override

	public void setEnvironment(Environment environment) {

		this.environment2=environment;

	}

	@Bean(name="environment2")

	public Environment readEnvironment() {

		return environment2;

	}

}


#springfox.documentation.swagger.v2.path=/api-docs

#server.contextPath=/v2

server.port=8080

swagger.enable=true

jdbc.driverClassName = com.mysql.jdbc.Driver

jdbc.url = jdbc:mysql://localhost:3306/websystique

jdbc.username = myuser

jdbc.password = mypassword

hibernate.dialect = org.hibernate.dialect.MySQLDialect

hibernate.show_sql = false

hibernate.format_sql = false

sourceLocation =/dev/input

destination =c\:/temp/output
username=jay

password=123

env=${pom.env}

ver=${pom.ver}

3.      pom中

<properties>

<springfox.version>2.8.0</springfox.version>

</properties>

<dependency>

<groupId>io.springfox</groupId>

<artifactId>springfox-swagger-ui</artifactId>

<version>${springfox.version}</version>

</dependency>

4.      使用system.load properties

java.util.Properties

package com.properties.util;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.util.Properties;

public class PropertiesUsage {

	public static void main(String[] args) throws Exception {

		Properties properties = new Properties();

		try (InputStream resourceAsStream = PropertiesUsage.class.getClassLoader().getResourceAsStream("application.properties");

				InputStreamReader inputStreamReader = new InputStreamReader(resourceAsStream,"UTF-8");){

			properties.load(inputStreamReader);

			System.out.println(properties.getProperty("hibernate.dialect"));

		}

	}

}

5. commons-configuration

package com.properties.util;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.configuration.ConfigurationException;

import org.apache.commons.configuration.PropertiesConfiguration;

import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;

import org.apache.commons.lang.StringUtils;

import lombok.extern.slf4j.Slf4j;

@Slf4j

public class PropertiesConfigUtil {

	public static final String PROPS_SUFFIX = ".properties";

	private static Map<String, PropertiesConfiguration> configMap = new ConcurrentHashMap<String, PropertiesConfiguration>();

	private static PropertiesConfiguration getConfig(String configName) {

		// 去除空格

		configName = configName.trim();

		// 有后缀使用后缀 没后缀 添加后缀

		String configSig = StringUtils.endsWith(configName, PROPS_SUFFIX) ? configName : configName + PROPS_SUFFIX;

		if (configMap.containsKey(configSig)) {

			return configMap.get(configSig);

		}

		PropertiesConfiguration config = null;

		try {

			config = new PropertiesConfiguration();

			config.setEncoding("UTF-8");

			config.load(configSig);

			// 默认五秒检查一次

			config.setReloadingStrategy(new FileChangedReloadingStrategy());

			config.setThrowExceptionOnMissing(true);

			configMap.put(configSig, config);

		} catch (ConfigurationException e) {

			e.printStackTrace();

		}

		return config;

	}

	public static Map<String, String> getKeyValuePairs(String configSig) {

		PropertiesConfiguration config = getConfig(configSig);

		if (config == null) {

			return null;

		}

		Iterator<String> iters = config.getKeys();

		Map<String, String> retMap = new HashMap<String, String>();

		while (iters.hasNext()) {

			String beforeKey = iters.next();

			if (retMap.containsKey(beforeKey)) {

				log.warn(configSig + " configKey:" + beforeKey + " repeated!!");

			}

			retMap.put(beforeKey, config.getString(beforeKey));

		}

		return retMap;

	}

	/**

	 * 通过PropertiesConfiguration取得参数的方法

	 * <p>

	 *

	 * @return 。

	 */

	static public String getString(String configSig, String key) {

		return getConfig(configSig).getString(key);

	}

	static public String getString(String configSig, String key, String defaultValue) {

		return getConfig(configSig).getString(key, defaultValue);

	}

	static public int getInt(String configSig, String key) {

		return getConfig(configSig).getInt(key);

	}

	static public int getInt(String configSig, String key, int defaultValue) {

		return getConfig(configSig).getInt(key, defaultValue);

	}

	static public boolean getBoolean(String configSig, String key) {

		return getConfig(configSig).getBoolean(key);

	}

	static public boolean getBoolean(String configSig, String key, boolean defaultValue) {

		return getConfig(configSig).getBoolean(key, defaultValue);

	}

	static public double getDouble(String configSig, String key) {

		return getConfig(configSig).getDouble(key);

	}

	static public double getDouble(String configSig, String key, double defaultValue) {

		return getConfig(configSig).getDouble(key, defaultValue);

	}

	static public float getFloat(String configSig, String key) {

		return getConfig(configSig).getFloat(key);

	}

	static public float getFloat(String configSig, String key, float defaultValue) {

		return getConfig(configSig).getFloat(key, defaultValue);

	}

	static public long getLong(String configSig, String key) {

		return getConfig(configSig).getLong(key);

	}

	static public long getLong(String configSig, String key, long defaultValue) {

		return getConfig(configSig).getLong(key, defaultValue);

	}

	static public short getShort(String configSig, String key) {

		return getConfig(configSig).getShort(key);

	}

	static public short getShort(String configSig, String key, short defaultValue) {

		return getConfig(configSig).getShort(key, defaultValue);

	}

	static public List<Object> getList(String configSig, String key) {

		return getConfig(configSig).getList(key);

	}

	static public List<Object> getList(String configSig, String key, List<Object> defaultValue) {

		return getConfig(configSig).getList(key, defaultValue);

	}

	static public byte getByte(String configSig, String key) {

		return getConfig(configSig).getByte(key);

	}

	static public byte getByte(String configSig, String key, byte defaultValue) {

		return getConfig(configSig).getByte(key, defaultValue);

	}

	static public String[] getStringArray(String configSig, String key) {

		return getConfig(configSig).getStringArray(key);

	}

}


package com.properties.util;

public class PropertiesConfigurationTest {

	public static void main(String[] args) {

		System.out.println(PropertiesConfigUtil.getString("application.properties", "hibernate.dialect"));

	}

}


#springfox.documentation.swagger.v2.path=/api-docs

#server.contextPath=/v2

server.port=8080

swagger.enable=true

jdbc.driverClassName = com.mysql.jdbc.Driver

jdbc.url = jdbc:mysql://localhost:3306/websystique

jdbc.username = myuser

jdbc.password = mypassword

hibernate.dialect = org.hibernate.dialect.MySQLDialect

hibernate.show_sql = false

hibernate.format_sql = false

sourceLocation =/dev/input

destination =c\:/temp/output

6. @ConfigurationProperties将properties导入到类中

package com.properties.configurationProperties;

import org.apache.commons.lang.builder.ReflectionToStringBuilder;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

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

import org.springframework.context.ConfigurableApplicationContext;

/*@EnableConfigurationProperties注解是用来开启对@ConfigurationProperties注解配置Bean的支持。

也就是@EnableConfigurationProperties注解告诉Spring Boot 使能支持@ConfigurationProperties*/

/*@ConfigurationProperties注解和@EnableConfigurationProperties配合使用*/

@SpringBootApplication

@EnableConfigurationProperties

public class DemoApplication {

	public static void main(String[] args) {

		try(ConfigurableApplicationContext configurableApplicationContext = SpringApplication.run(DemoApplication.class, args);){

			RedisProps redisProps = configurableApplicationContext.getBean(RedisProps.class);

			System.out.println(ReflectionToStringBuilder.toString(redisProps));

		}

	}

}


package com.properties.configurationProperties;

import java.util.List;

import java.util.Map;

import javax.validation.constraints.NotNull;

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

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.PropertySource;

import org.springframework.stereotype.Component;

import lombok.Data;

@Component

@PropertySource("classpath:application.yml")

@Configuration

@ConfigurationProperties(prefix = "spring.redis")

@Data

public class RedisProps {

	private int dbIndex;

	@NotNull

	private String hostname;

	private String password;

	@NotNull

	private int port;

	private long timeout;

	private List<Map<String, String>> poolConfig;

}
spring:

  redis:

    dbIndex: 0

    hostName: 192.168.58.133

    password: nmamtf

    port: 6379

    timeout: 0

    poolConfig:

      - maxIdle: 8

      - minIdle: 0

      - maxActive: 8

      - maxWait: -1

7. 使用第三方jar，比如Archaius

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