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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