SpringBoot动态更新yml文件(springboot动态更新配置)

  本篇文章为你整理了SpringBoot动态更新yml文件(springboot动态更新配置)的详细内容,包含有springboot 动态更新配置文件 springboot动态更新配置 springboot更新数据 springboot动态修改properties SpringBoot动态更新yml文件,希望能帮助你了解 SpringBoot动态更新yml文件。

  在系统运行过程中,可能由于一些配置项的简单变动需要重新打包启停项目,这对于在运行中的项目会造成数据丢失,客户操作无响应等情况发生,针对这类情况对开发框架进行升级提供yml文件实时修改更新功能

  项目基于的是2.0.0.RELEASE版本,所以snakeyaml需要单独引入,高版本已包含在内

  

 dependency 

 

   groupId org.yaml /groupId

   artifactId snakeyaml /artifactId

   version 1.23 /version

   /dependency

  

 

  网上大多数方法是引入spring-cloud-context配置组件调用ContextRefresher的refresh方法达到同样的效果,考虑以下两点未使用

  开发框架使用了logback日志,引入spring-cloud-context会造成日志配置读取错误

  引入spring-cloud-context会同时引入spring-boot-starter-actuator组件,会开放一些健康检查路由及端口,需要对框架安全方面进行额外控制

  YML文件内容获取

  读取resource文件下的文件需要使用ClassPathResource获取InputStream

  

 public String getTotalYamlFileContent() throws Exception {

 

   String fileName = "application.yml";

   return getYamlFileContent(fileName);

   public String getYamlFileContent(String fileName) throws Exception {

   ClassPathResource classPathResource = new ClassPathResource(fileName);

   return onvertStreamToString(classPathResource.getInputStream());

   public static String convertStreamToString(InputStream inputStream) throws Exception{

   return IOUtils.toString(inputStream, "utf-8");

  

 

  YML文件内容更新

  我们获取到yml文件内容后可视化显示到前台进行展示修改,将修改后的内容通过yaml.load方法转换成Map结构,再使用yaml.dumpAsMap转换为流写入到文件

  

 public void updateTotalYamlFileContent(String content) throws Exception {

 

   String fileName = "application.yml";

   updateYamlFileContent(fileName, content);

   public void updateYamlFileContent(String fileName, String content) throws Exception {

   Yaml template = new Yaml();

   Map String, Object yamlMap = template.load(content);

   ClassPathResource classPathResource = new ClassPathResource(fileName);

   Yaml yaml = new Yaml();

   //字符输出

   FileWriter fileWriter = new FileWriter(classPathResource.getFile());

   //用yaml方法把map结构格式化为yaml文件结构

   fileWriter.write(yaml.dumpAsMap(yamlMap));

   //刷新

   fileWriter.flush();

   //关闭流

   fileWriter.close();

  

 

  YML属性刷新

  yml属性在程序中读取使用一般有三种

  使用Value注解

  

 @Value("${system.systemName}")

 

   private String systemName;

  

 

  通过enviroment注入读取

  

 @Autowired

 

   private Environment environment;

   environment.getProperty("system.systemName")

  

 

  使用ConfigurationProperties注解读取

  

@Component

 

  @ConfigurationProperties(prefix = "system")

  public class SystemConfig {

   private String systemName;

  

 

  Property刷新

  我们通过environment.getProperty方法读取的配置集合实际是存储在PropertySources中的,我们只需要把键值对全部取出存储在propertyMap中,将更新后的yml文件内容转换成相同格式的ymlMap,两个Map进行合并,调用PropertySources的replace方法进行整体替换即可

  但是yaml.load后的ymlMap和PropertySources取出的propertyMap两者数据解构是不同的,需要进行手动转换

  propertyMap集合就是单纯的key,value键值对,key是properties形式的名称,例如system.systemName= xxxxx集团管理系统

  ymlMap集合是key,LinkedHashMap的嵌套层次结构,例如system= (systemName= xxxxx集团管理系统)

  转换方法如下

  

 public HashMap String, Object convertYmlMapToPropertyMap(Map String, Object yamlMap) {

 

   HashMap String, Object propertyMap = new HashMap String, Object

   for (String key : yamlMap.keySet()) {

   String keyName = key;

   Object value = yamlMap.get(key);

   if (value != null value.getClass() == LinkedHashMap.class) {

   convertYmlMapToPropertyMapSub(keyName, ((LinkedHashMap String, Object ) value), propertyMap);

   } else {

   propertyMap.put(keyName, value);

   return propertyMap;

   private void convertYmlMapToPropertyMapSub(String keyName, LinkedHashMap String, Object submMap, Map String, Object propertyMap) {

   for (String key : submMap.keySet()) {

   String newKey = keyName + "." + key;

   Object value = submMap.get(key);

   if (value != null value.getClass() == LinkedHashMap.class) {

   convertYmlMapToPropertyMapSub(newKey, ((LinkedHashMap String, Object ) value), propertyMap);

   } else {

   propertyMap.put(newKey, value);

  

 

  刷新方法如下

  

 String name = "applicationConfig: [classpath:/" + fileName + "]";

 

   MapPropertySource propertySource = (MapPropertySource) environment.getPropertySources().get(name);

   Map String, Object source = propertySource.getSource();

   Map String, Object map = new HashMap (source.size());

   map.putAll(source);

   Map String, Object propertyMap = convertYmlMapToPropertyMap(yamlMap);

   for (String key : propertyMap.keySet()) {

   Object value = propertyMap.get(key);

   map.put(key, value);

   environment.getPropertySources().replace(name, new MapPropertySource(name, map));

  

 

  不论是Value注解还是ConfigurationProperties注解,实际都是通过注入Bean对象的属性方法使用的,我们先自定注解RefreshValue来修饰属性所在Bean的class

  通过实现InstantiationAwareBeanPostProcessorAdapter接口在系统启动时过滤筛选对应的Bean存储下来,在更新yml文件时通过spring的event通知更新对应

  bean的属性即可

  注册事件使用EventListener注解

  

 @EventListener

 

   public void updateConfig(ConfigUpdateEvent configUpdateEvent) {

   if(mapper.containsKey(configUpdateEvent.key)){

   List FieldPair fieldPairList = mapper.get(configUpdateEvent.key);

   if(fieldPairList.size() 0){

   for (FieldPair fieldPair:fieldPairList) {

   fieldPair.updateValue(environment);

  

 

  通知触发事件使用ApplicationContext的publishEvent方法

  

 @Autowired

 

   private ApplicationContext applicationContext;

   for (String key : propertyMap.keySet()) {

   applicationContext.publishEvent(new YamlConfigRefreshPostProcessor.ConfigUpdateEvent(this, key));

  

 

  YamlConfigRefreshPostProcessor的完整代码如下

  

@Component

 

  public class YamlConfigRefreshPostProcessor extends InstantiationAwareBeanPostProcessorAdapter implements EnvironmentAware {

   private Map String, List FieldPair mapper = new HashMap ();

   private Environment environment;

   @Override

   public boolean postProcessAfterInstantiation(Object bean, String beanName) throws BeansException {

   processMetaValue(bean);

   return super.postProcessAfterInstantiation(bean, beanName);

   @Override

   public void setEnvironment(Environment environment) {

   this.environment = environment;

   private void processMetaValue(Object bean) {

   Class clz = bean.getClass();

   if (!clz.isAnnotationPresent(RefreshValue.class)) {

   return;

   if (clz.isAnnotationPresent(ConfigurationProperties.class)) {

   //@ConfigurationProperties注解

   ConfigurationProperties config = (ConfigurationProperties) clz.getAnnotation(ConfigurationProperties.class);

   for (Field field : clz.getDeclaredFields()) {

   String key = config.prefix() + "." + field.getName();

   if(mapper.containsKey(key)){

   mapper.get(key).add(new FieldPair(bean, field, key));

   }else{

   List FieldPair fieldPairList = new ArrayList ();

   fieldPairList.add(new FieldPair(bean, field, key));

   mapper.put(key, fieldPairList);

   } else {

   //@Valuez注解

   try {

   for (Field field : clz.getDeclaredFields()) {

   if (field.isAnnotationPresent(Value.class)) {

   Value val = field.getAnnotation(Value.class);

   String key = val.value().replace("${", "").replace("}", "");

   if(mapper.containsKey(key)){

   mapper.get(key).add(new FieldPair(bean, field, key));

   }else{

   List FieldPair fieldPairList = new ArrayList ();

   fieldPairList.add(new FieldPair(bean, field, key));

   mapper.put(key, fieldPairList);

   } catch (Exception e) {

   e.printStackTrace();

   System.exit(-1);

   public static class FieldPair {

   private static PropertyPlaceholderHelper propertyPlaceholderHelper = new PropertyPlaceholderHelper("${", "}",

   ":", true);

   private Object bean;

   private Field field;

   private String value;

   public FieldPair(Object bean, Field field, String value) {

   this.bean = bean;

   this.field = field;

   this.value = value;

   public void updateValue(Environment environment) {

   boolean access = field.isAccessible();

   if (!access) {

   field.setAccessible(true);

   try {

   if (field.getType() == String.class) {

   String updateVal = environment.getProperty(value);

   field.set(bean, updateVal);

   else if (field.getType() == Integer.class) {

   Integer updateVal = environment.getProperty(value,Integer.class);

   field.set(bean, updateVal);

   else if (field.getType() == int.class) {

   int updateVal = environment.getProperty(value,int.class);

   field.set(bean, updateVal);

   else if (field.getType() == Boolean.class) {

   Boolean updateVal = environment.getProperty(value,Boolean.class);

   field.set(bean, updateVal);

   else if (field.getType() == boolean.class) {

   boolean updateVal = environment.getProperty(value,boolean.class);

   field.set(bean, updateVal);

   else {

   String updateVal = environment.getProperty(value);

   field.set(bean, JSONObject.parseObject(updateVal, field.getType()));

   } catch (IllegalAccessException e) {

   e.printStackTrace();

   field.setAccessible(access);

   public Object getBean() {

   return bean;

   public void setBean(Object bean) {

   this.bean = bean;

   public Field getField() {

   return field;

   public void setField(Field field) {

   this.field = field;

   public String getValue() {

   return value;

   public void setValue(String value) {

   this.value = value;

   public static class ConfigUpdateEvent extends ApplicationEvent {

   String key;

   public ConfigUpdateEvent(Object source, String key) {

   super(source);

   this.key = key;

   @EventListener

   public void updateConfig(ConfigUpdateEvent configUpdateEvent) {

   if(mapper.containsKey(configUpdateEvent.key)){

   List FieldPair fieldPairList = mapper.get(configUpdateEvent.key);

   if(fieldPairList.size() 0){

   for (FieldPair fieldPair:fieldPairList) {

   fieldPair.updateValue(environment);

  

 

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