本篇文章为大家展示了如何在SpringBoot 中使用AutoConfiguration，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
成都创新互联专注于企业网络营销推广、网站重做改版、黟县网站定制设计、自适应品牌网站建设、H5建站、成都商城网站开发、集团公司官网建设、成都外贸网站建设、高端网站制作、响应式网页设计等建站业务，价格优惠性价比高，为黟县等各大城市提供网站开发制作服务。
主要代码片段:
String[] selectImports(AnnotationMetadata annotationMetadata)方法中
AutoConfigurationImportSelector.AutoConfigurationEntry autoConfigurationEntry = this.getAutoConfigurationEntry(autoConfigurationMetadata, annotationMetadata);
getAutoConfigurationEntry方法中:
Listconfigurations = this.getCandidateConfigurations(annotationMetadata, attributes); protected List getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes) { List configurations = SpringFactoriesLoader.loadFactoryNames(this.getSpringFactoriesLoaderFactoryClass(), this.getBeanClassLoader()); Assert.notEmpty(configurations, "No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct."); return configurations; }
最后会通过SpringFactoriesLoader.loadSpringFactories去加载META-INF/spring.factories
Enumerationurls = classLoader != null ? classLoader.getResources("META-INF/spring.factories") : ClassLoader.getSystemResources("META-INF/spring.factories"); LinkedMultiValueMap result = new LinkedMultiValueMap();
while(urls.hasMoreElements()) {
URL url = (URL)urls.nextElement();
UrlResource resource = new UrlResource(url);
Properties properties = PropertiesLoaderUtils.loadProperties(resource);
Iterator var6 = properties.entrySet().iterator();
while(var6.hasNext()) {
Entry entry = (Entry)var6.next();
String factoryClassName = ((String)entry.getKey()).trim();
String[] var9 = StringUtils.commaDelimitedListToStringArray((String)entry.getValue());
int var10 = var9.length;
for(int var11 = 0; var11 < var10; ++var11) {
String factoryName = var9[var11];
result.add(factoryClassName, factoryName.trim());
}
}
}ZookeeperAutoConfiguration
我们来实现一个ZK的AutoConfiguration
首先定义一个ZookeeperAutoConfiguration类
然后在META-INF/spring.factories中加入
org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.fayayo.fim.zookeeper.ZookeeperAutoConfiguration
接下来我们看看具体的实现:
@ConfigurationProperties(prefix = "fim.register")
@Configuration
public class URLRegistry {
private String address;
private int timeout;
private int sessionTimeout;
public String getAddress() {
if (address == null) {
address = URLParam.ADDRESS;
}
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getTimeout() {
if (timeout == 0) {
timeout = URLParam.CONNECTTIMEOUT;
}
return timeout;
}
public void setTimeout(int timeout) {
this.timeout = timeout;
}
public int getSessionTimeout() {
if (sessionTimeout == 0) {
sessionTimeout = URLParam.REGISTRYSESSIONTIMEOUT;
}
return sessionTimeout;
}
public void setSessionTimeout(int sessionTimeout) {
this.sessionTimeout = sessionTimeout;
}
}
@Configuration
@EnableConfigurationProperties(URLRegistry.class)
@Slf4j
public class ZookeeperAutoConfiguration {
@Autowired
private URLRegistry url;
@Bean(value = "registry")
public Registry createRegistry() {
try {
String address = url.getAddress();
int timeout = url.getTimeout();
int sessionTimeout = url.getSessionTimeout();
log.info("init ZookeeperRegistry,address[{}],sessionTimeout[{}],timeout[{}]", address, timeout, sessionTimeout);
ZkClient zkClient = new ZkClient(address, sessionTimeout, timeout);
return new ZookeeperRegistry(zkClient);
} catch (ZkException e) {
log.error("[ZookeeperRegistry] fail to connect zookeeper, cause: " + e.getMessage());
throw e;
}
}
}ZookeeperRegistry部分实现:
public ZookeeperRegistry(ZkClient zkClient) {
this.zkClient = zkClient;
log.info("zk register success!");
String parentPath = URLParam.ZOOKEEPER_REGISTRY_NAMESPACE;
try {
if (!zkClient.exists(parentPath)) {
log.info("init zookeeper registry namespace");
zkClient.createPersistent(parentPath, true);
}
//监听
zkClient.subscribeChildChanges(parentPath, new IZkChildListener() {
//对父节点添加监听子节点变化。
@Override
public void handleChildChange(String parentPath, List currentChilds) {
log.info(String.format("[ZookeeperRegistry] service list change: path=%s, currentChilds=%s", parentPath, currentChilds.toString()));
if(watchNotify!=null){
watchNotify.notify(nodeChildsToUrls(currentChilds));
}
}
});
ShutDownHook.registerShutdownHook(this);
} catch (Exception e) {
e.printStackTrace();
log.error("Failed to subscribe zookeeper");
}
} 具体使用
那么我们怎么使用自己写的ZookeeperAutoConfiguration呢
首先要在需要使用的项目中引入依赖
com.fayayo fim-registry-zookeeper 0.0.1-SNAPSHOT
然后配置参数
fim: register: address: 192.168.88.129:2181 timeout: 2000
如果不配置会有默认的参数
具体使用的时候只需要在Bean中注入就可以了,比如
@Autowired private Registry registry; public ListgetAll(){ List list=cache.get(KEY); if(CollectionUtils.isEmpty(list)){ list=registry.discover(); cache.put(KEY,list); } return list; }
springboot一种全新的编程规范，其设计目的是用来简化新Spring应用的初始搭建以及开发过程，SpringBoot也是一个服务于框架的框架，服务范围是简化配置文件。
上述内容就是如何在SpringBoot 中使用AutoConfiguration，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注创新互联行业资讯频道。
