zoukankan html css js c++ java

获取properties配置

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

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

</properties>

<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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原文地址：https://www.cnblogs.com/xiang--liu/p/9710263.html