Spring Boot可以通過 @PropertySource, @Value, @Environment, @ConfigurationProperties 來繫結變數

1.讀取application檔案

key.value=123456
key.password=123456

　　@Value註解讀取

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class ToolsConfilg{

　　@Value(
 
"${key.value}")
   private String value;
   
   @Value("${key.password}") 
   private String password; 
   
   //...GET\SET
 }

　　@ConfigurationProperties註解讀取

@Component
@ConfigurationProperties(prefix = "info")
public class ToolsConfilg{

   private String key;
   
   private String password; 
   
   //...GET\SET
 }
 

　　讀取指定檔案

　　在resources（資源目錄）下建立 config/datasource-config.properties

datasource.username=root

datasource.password=root

　　@PropertySource+@Value註解讀取 (@PropertySource不支援yml檔案讀取)

@Component
@PropertySource(value = { "config/datasource-config.properties" })
public class DatasourceConfig{
 @Value("${datasource.username}")
 
 
private String username;
 @Value("${datasource.password}")
 private String password;
 public String getUsername() {
 
　　....get/set

}

　　@PropertySource+@ConfigurationProperties註解讀取

@Component
@ConfigurationProperties(prefix = "datasource")
@PropertySource(value = { "config/datasource-config.properties" })
public class DatasourceConfig{
 private String username;
 private String password;
 
　　...get/set

}

　　Environment讀取

@Autowired
private Environment env;
// 獲取引數
String getProperty(String key);