Springboot yml Map List读取
Springboot 读取yml中的值作为参数，有2种写法：
例子：
已知有如下yml配置：
myapps:
1131f78c313e11e79da3000c298bdf0e: AMS系统
1ae211c543a14cf6981274fec3281f0c: BMS系统
app1: 测试 现在需要将myapps读到配置文件作为配置类。有2种做法：
1、配置类集中放置
也就是说应用中设一个配置类，所有涉及yml配置的类都放置在该类中。
@Configuration
@Order(Ordered.HIGHEST_PRECEDENCE)
public class MyConfiguration {
static Logger log = LoggerFactory.getLogger(MyConfiguration.class);
@Bean
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
return new PropertySourcesPlaceholderConfigurer();
}
@Value("${px.a.trackerServer}")
String trackerServer = "";
@Value("${px.a.disabled:true}")
boolean disableA = true;
@Bean
@ConfigurationProperties(prefix = "px.client")
ClientConfigInfo clientConfigInfo(){
ClientConfigInfo clientConfigInfo = new ClientConfigInfo();
return clientConfigInfo;
}
@Bean
@ConfigurationProperties(prefix = "px")
MyAppConfiguration myAppConfiguration(){
MyAppConfiguration myAppConfiguration = new MyAppConfiguration ();
return myAppConfiguration;
}
}这里配置为：
@Bean
@ConfigurationProperties(prefix = "px")
UdsAppConfiguration udsAppConfiguration(){undefined
UdsAppConfiguration udsAppConfiguration = new UdsAppConfiguration();
return udsAppConfiguration;
}2、配置类单独放置
也就是说把MyAppConfiguration单独作为一个配置类进行单独的组装。
@Component
@ConfigurationProperties(prefix="px", ignoreInvalidFields=true, ignoreUnknownFields=true)
public class MyAppConfiguration {
static Logger log = LoggerFactory.getLogger(MyAppConfiguration.class);
private Map<String, String> mysapps = new HashMap<String, String>();
public Map<String, String> getMyapps() {
return myapps;
}
public void setMyapps(Map<String, String> myapps) {
this.myapps = myapps;
}
}3、List读取
（1）yml
myapps:
- 1131f78c313e11e79da3000c298bdf0e: AMS系统
- 1ae211c543a14cf6981274fec3281f0c: BMS系统
- app1: 测试 （2）配置类写法
@Component
@ConfigurationProperties(prefix="px", ignoreInvalidFields=true, ignoreUnknownFields=true)
public class MyAppConfiguration {
static Logger log = LoggerFactory.getLogger(MyAppConfiguration.class);
private List<Map<String, String>> mysapps = new ArrayList<Map<String, String>>();
public List<Map<String, String>> getMyapps() {
return myapps;
}
public void setMyapps(List<Map<String, String>> myapps) {
this.myapps = myapps;
}
}4、问题：配置类没有获取到值
该问题的原因很可能是yml中定义的key与配置类中定义的属性名称不一致，导致Springboot自动装配时失败。出现该问题后，一定首先要仔细检查配置类对应属性的名称以及配置类映射的路径。
Springboot yml内list、map组合写法
yml:
myProps:
varmaplist:
key11:
- t1
- t2
- t3
key22:
- t11
- t22
- t33
list:
- topic1
- topic2
- topic3
maps: {key1: 'value1', key2: 'value2'}MyProps:
@Component
@Data
@Configuration
@PropertySource(value = {"classpath:/bootstrap.yml"}, encoding = "utf-8")
@ConfigurationProperties(prefix = "myProps")
public class MyProps {
private List<String> list;
private Map<String,String> maps;
private Map<String,List<String>> varmaplist;
}以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
