Parse redis database from url if present

Fix GH-43810

Signed-off-by: Yanming Zhou <zhouyanming@gmail.com>

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/PropertiesRedisConnectionDetails.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@
  * @author Andy Wilkinson
  * @author Phillip Webb
  * @author Scott Frederick
+ * @author Yanming Zhou
  */
 class PropertiesRedisConnectionDetails implements RedisConnectionDetails {
 
@@ -39,7 +40,7 @@ class PropertiesRedisConnectionDetails implements RedisConnectionDetails {
 	@Override
 	public String getUsername() {
 		if (this.properties.getUrl() != null) {
-			ConnectionInfo connectionInfo = connectionInfo(this.properties.getUrl());
+			ConnectionInfo connectionInfo = RedisConnectionConfiguration.parseUrl(this.properties.getUrl());
 			return connectionInfo.getUsername();
 		}
 		return this.properties.getUsername();
@@ -48,7 +49,7 @@ public String getUsername() {
 	@Override
 	public String getPassword() {
 		if (this.properties.getUrl() != null) {
-			ConnectionInfo connectionInfo = connectionInfo(this.properties.getUrl());
+			ConnectionInfo connectionInfo = RedisConnectionConfiguration.parseUrl(this.properties.getUrl());
 			return connectionInfo.getPassword();
 		}
 		return this.properties.getPassword();
@@ -57,17 +58,14 @@ public String getPassword() {
 	@Override
 	public Standalone getStandalone() {
 		if (this.properties.getUrl() != null) {
-			ConnectionInfo connectionInfo = connectionInfo(this.properties.getUrl());
+			ConnectionInfo connectionInfo = RedisConnectionConfiguration.parseUrl(this.properties.getUrl());
 			return Standalone.of(connectionInfo.getUri().getHost(), connectionInfo.getUri().getPort(),
-					this.properties.getDatabase());
+					connectionInfo.getDatabase() != null ? connectionInfo.getDatabase()
+							: this.properties.getDatabase());
 		}
 		return Standalone.of(this.properties.getHost(), this.properties.getPort(), this.properties.getDatabase());
 	}
 
-	private ConnectionInfo connectionInfo(String url) {
-		return (url != null) ? RedisConnectionConfiguration.parseUrl(url) : null;
-	}
-
 	@Override
 	public Sentinel getSentinel() {
 		org.springframework.boot.autoconfigure.data.redis.RedisProperties.Sentinel sentinel = this.properties

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/RedisConnectionConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,6 +45,7 @@
  * @author Moritz Halbritter
  * @author Andy Wilkinson
  * @author Phillip Webb
+ * @author Yanming Zhou
  */
 abstract class RedisConnectionConfiguration {
 
@@ -200,7 +201,12 @@ static ConnectionInfo parseUrl(String url) {
 					password = candidate;
 				}
 			}
-			return new ConnectionInfo(uri, useSsl, username, password);
+			Integer database = null;
+			String[] pathSplit = uri.getPath().split("/", 2);
+			if (pathSplit.length > 1 && !pathSplit[1].isEmpty()) {
+				database = Integer.parseInt(pathSplit[1]);
+			}
+			return new ConnectionInfo(uri, useSsl, username, password, database);
 		}
 		catch (URISyntaxException ex) {
 			throw new RedisUrlSyntaxException(url, ex);
@@ -217,11 +223,14 @@ static class ConnectionInfo {
 
 		private final String password;
 
-		ConnectionInfo(URI uri, boolean useSsl, String username, String password) {
+		private final Integer database;
+
+		ConnectionInfo(URI uri, boolean useSsl, String username, String password, Integer database) {
 			this.uri = uri;
 			this.useSsl = useSsl;
 			this.username = username;
 			this.password = password;
+			this.database = database;
 		}
 
 		URI getUri() {
@@ -240,6 +249,10 @@ String getPassword() {
 			return this.password;
 		}
 
+		Integer getDatabase() {
+			return this.database;
+		}
+
 	}
 
 }

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/RedisProperties.java

@@ -31,6 +31,7 @@
  * @author Mark Paluch
  * @author Stephane Nicoll
  * @author Scott Frederick
+ * @author Yanming Zhou
  * @since 1.0.0
  */
 @ConfigurationProperties(prefix = "spring.data.redis")
@@ -42,8 +43,8 @@ public class RedisProperties {
 	private int database = 0;
 
 	/**
-	 * Connection URL. Overrides host, port, username, and password. Example:
-	 * redis://user:password@example.com:6379
+	 * Connection URL. Overrides host, port, username, password, and database. Example:
+	 * redis://user:password@example.com:6379/8
 	 */
 	private String url;
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/redis/PropertiesRedisConnectionDetailsTests.java

@@ -103,7 +103,7 @@ void standaloneIsConfiguredFromUrl() {
 		RedisConnectionDetails.Standalone standalone = connectionDetails.getStandalone();
 		assertThat(standalone.getHost()).isEqualTo("example.com");
 		assertThat(standalone.getPort()).isEqualTo(1234);
-		assertThat(standalone.getDatabase()).isEqualTo(5);
+		assertThat(standalone.getDatabase()).isEqualTo(9999);
 	}
 
 	@Test