springBoot如何动态加载资源文件 springBoot如何动态加载资源文件

springBoot动态加载资源文件

构造DynamicLoadPropertySource
添加到Enviroment

springBoot静态资源动态加载

举例说明

springBoot动态加载资源文件在实际项目中资源信息如果能够动态获取在修改线上产品配置时极其方便，下面来展示一个加载动态获取资源的案例，而不是加载写死的properties文件信息。
首先构造PropertySource，然后将其添加到Enviroment中。

构造DynamicLoadPropertySource

package com.wangh.test; import java.io.InputStream; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Enumeration; import java.util.HashMap; import java.util.Map; import java.util.Properties; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.core.env.MapPropertySource; /** * 动态加载配置文件 * @ClassName:DynamicLoadPropertySource * @author:Wh * @date: 2017年9月14日下午3:22:54 */public class DynamicLoadPropertySource extends MapPropertySource{private static Logger log = LoggerFactory.getLogger(DynamicLoadPropertySource.class); private static Map map = new ConcurrentHashMap(64); private static ScheduledExecutorService scheduled = Executors.newScheduledThreadPool(1); static {scheduled.scheduleAtFixedRate(new Runnable() {@Overridepublic void run() {map = dynamicLoadMapInfo(); }}, 1, 10, TimeUnit.SECONDS); }/*** @param name* @param source*/public DynamicLoadPropertySource(String name, Map source) {super(name, map); }@Overridepublic Object getProperty(String name) {return map.get(name); }/*** //动态获取资源信息* @return*/protected static Map dynamicLoadMapInfo() {return mockMapInfo(); }/*** @return*/private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); private static Map mockMapInfo() {Map map = new HashMap(); map = getProperties(); log.info("data{}; currentTime:{}", map.get("spring.datasource.url"), sdf.format(new Date())); return map; }/*** 获取配置文件信息* @return*/public static Map getProperties() {Properties props = new Properties(); Map map = new HashMap(); try {InputStream in = ClassLoader.getSystemResourceAsStream("pro.properties"); props.load(in); Enumeration en = props.propertyNames(); while (en.hasMoreElements()) {String key = (String) en.nextElement(); String property = props.getProperty(key); map.put(key, property); }} catch (Exception e) {e.printStackTrace(); }return map; }}

添加到Enviroment

package com.wangh.test; import javax.annotation.PostConstruct; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.core.env.AbstractEnvironment; /** * 加载动态配置信息 * @ClassName:DynamicConfig * @author:Wh * @date: 2017年9月14日下午3:38:17 */@Configurationpublic class DynamicConfig {//资源信息元数据:PropertySource包含name和泛型，一份资源信息存在唯一的name以及对应泛型数据，在这里设计为泛型表明可拓展自定.PropertySource在集合中的唯一性只能去看namepublic static final String DYNAMIC_CONFIG_NAME = "dynamic_config"; @AutowiredAbstractEnvironment environment; @PostConstructpublic void init() {environment.getPropertySources().addFirst(new DynamicLoadPropertySource(DYNAMIC_CONFIG_NAME, null)); }}

springBoot静态资源动态加载