Few days ago, I accidentally stumbled upon a Spring annotation from Spring Boot project while I was checking something else.
We all know how to bind property values with "@Value" to the classes and we all know that this can be quite cumbersome if there are multiple properties to bind. Spring Boot is here to help. You can use "@ConfigurationProperties" and bind multiple values quite concisely. We will give a prefix to differentiate other configs from ours. e.g. "@ConfigurationProperties(prefix = "jdbc")".
Any field this annotated class has is populated with property values from the property resource. For instance if it has a username parameter then property resource with "jdbc.username" key will populate this field. The most practical way of using this annotation is using it with "@Configuration".
You can check how we create the config class.
And below you can check the properties we map from application properties
You can also check here for a working toy project using "@ConfigurationProperties".
We all know how to bind property values with "@Value" to the classes and we all know that this can be quite cumbersome if there are multiple properties to bind. Spring Boot is here to help. You can use "@ConfigurationProperties" and bind multiple values quite concisely. We will give a prefix to differentiate other configs from ours. e.g. "@ConfigurationProperties(prefix = "jdbc")".
Any field this annotated class has is populated with property values from the property resource. For instance if it has a username parameter then property resource with "jdbc.username" key will populate this field. The most practical way of using this annotation is using it with "@Configuration".
You can check how we create the config class.
01 | package com.sezinkarli.tryconfigprops; |
02 |
03 | import org.springframework.boot.context.properties.ConfigurationProperties; |
04 | import org.springframework.context.annotation.Configuration; |
05 |
06 | import javax.annotation.PostConstruct; |
07 | import java.util.HashMap; |
08 | import java.util.Map; |
09 |
10 | @Configuration |
11 | @ConfigurationProperties(prefix = "jdbc") |
12 | public class JdbcConfig |
13 | { |
14 | private String user; |
15 | private String password; |
16 | private String url; |
17 | private String driver; |
18 |
19 | public String getUser() |
20 | { |
21 | return user; |
22 | } |
23 |
24 | public void setUser(String user) |
25 | { |
26 | this.user = user; |
27 | } |
28 |
29 | public String getPassword() |
30 | { |
31 | return password; |
32 | } |
33 |
34 | public void setPassword(String password) |
35 | { |
36 | this.password = password; |
37 | } |
38 |
39 | public String getUrl() |
40 | { |
41 | return url; |
42 | } |
43 |
44 | public void setUrl(String url) |
45 | { |
46 | this.url = url; |
47 | } |
48 |
49 | public String getDriver() |
50 | { |
51 | return driver; |
52 | } |
53 |
54 | public void setDriver(String driver) |
55 | { |
56 | this.driver = driver; |
57 | } |
58 |
59 | public String getProperty(String key) |
60 | { |
61 | return propertyMap.get(key); |
62 | } |
63 | } |
jdbc.user=myJdbcUser jdbc.password=myPwd jdbc.url=myUrl jdbc.driver=myJdbcDriverAfter that you can easily get these values by injecting the configuration class to somewhere.
1 | @Service |
2 | public class YourService |
3 | { |
4 |
5 | @Autowired |
6 | private JdbcConfig jdbcConfig; |
7 | } |
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