如果終於得到這個工作。 （主要感謝stephane-deraco對github）
該解決方案的關鍵是實現ApplicationContextInitializer<ConfigurableApplicationContext>的類。我叫它PropertyPasswordDecodingContextInitializer。
主要問題是讓春天使用這個ApplicationContextInitializer。重要信息請參見reference。我選擇使用具有以下內容的META-INF/spring.factories所述的方法：實現類
org.springframework.context.ApplicationContextInitializer=ch.mycompany.myproject.PropertyPasswordDecodingContextInitializer
的PropertyPasswordDecodingContextInitializer使用PropertyPasswordDecoder和，目前爲了簡單起見，Base64PropertyPasswordDecoder。
PropertyPasswordDecodingContextInitializer.java
package ch.mycompany.myproject;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.CompositePropertySource;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.stereotype.Component;
@Component
public class PropertyPasswordDecodingContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
private static final Pattern decodePasswordPattern = Pattern.compile("password\\((.*?)\\)");
private PropertyPasswordDecoder passwordDecoder = new Base64PropertyPasswordDecoder();
@Override
public void initialize(ConfigurableApplicationContext applicationContext) {
ConfigurableEnvironment environment = applicationContext.getEnvironment();
for (PropertySource<?> propertySource : environment.getPropertySources()) {
Map<String, Object> propertyOverrides = new LinkedHashMap<>();
decodePasswords(propertySource, propertyOverrides);
if (!propertyOverrides.isEmpty()) {
PropertySource<?> decodedProperties = new MapPropertySource("decoded "+ propertySource.getName(), propertyOverrides);
environment.getPropertySources().addBefore(propertySource.getName(), decodedProperties);
}
}
}
private void decodePasswords(PropertySource<?> source, Map<String, Object> propertyOverrides) {
if (source instanceof EnumerablePropertySource) {
EnumerablePropertySource<?> enumerablePropertySource = (EnumerablePropertySource<?>) source;
for (String key : enumerablePropertySource.getPropertyNames()) {
Object rawValue = source.getProperty(key);
if (rawValue instanceof String) {
String decodedValue = decodePasswordsInString((String) rawValue);
propertyOverrides.put(key, decodedValue);
}
}
}
}
private String decodePasswordsInString(String input) {
if (input == null) return null;
StringBuffer output = new StringBuffer();
Matcher matcher = decodePasswordPattern.matcher(input);
while (matcher.find()) {
String replacement = passwordDecoder.decodePassword(matcher.group(1));
matcher.appendReplacement(output, replacement);
}
matcher.appendTail(output);
return output.toString();
}
}
PropertyPasswordDecoder.java
package ch.mycompany.myproject;
public interface PropertyPasswordDecoder {
public String decodePassword(String encodedPassword);
}
Base64PropertyPasswordDecoder.java
package ch.mycompany.myproject;
import java.io.UnsupportedEncodingException;
import org.apache.commons.codec.binary.Base64;
public class Base64PropertyPasswordDecoder implements PropertyPasswordDecoder {
@Override
public String decodePassword(String encodedPassword) {
try {
byte[] decodedData = Base64.decodeBase64(encodedPassword);
String decodedString = new String(decodedData, "UTF-8");
return decodedString;
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
}
請注意，ApplicationContext在此階段尚未完成初始化，因此自動裝配或任何其他與bean相關的機制都不起作用。
更新：包括@jny的建議。
我不認爲你可以，如果你只是使用內置到Spring中的東西。但是，如果您手動加載此YAML，然後將其送入Spring，請在此處執行此操作。 –
我想我可以寫我自己的PropertySource。我希望找到適用於所有財產來源的機制。 –
您可能對[Spring Boot問題]感興趣（https://github.com/spring-projects/spring-boot/issues/1312） –