From ab396966eac78c435fa6dfb1a0ea697768d6b05a Mon Sep 17 00:00:00 2001
From: Scott <chengzhifan_czf@163.com>
Date: Tue, 11 May 2021 18:18:17 +0800
Subject: [PATCH] =?UTF-8?q?feat(config):=20=E6=B7=BB=E5=8A=A0=E8=A7=A3?=
 =?UTF-8?q?=E6=9E=90=E9=85=8D=E7=BD=AE=E5=90=8D=E6=B3=A8=E9=87=8A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../context/support/AbstractApplicationContext.java            | 3 +++
 .../support/AbstractRefreshableConfigApplicationContext.java   | 1 +
 .../context/support/ClassPathXmlApplicationContext.java        | 1 +
 .../org/springframework/core/env/AbstractPropertyResolver.java | 1 +
 4 files changed, 6 insertions(+)

diff --git a/spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java b/spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java
index df733ef..5326377 100644
--- a/spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java
+++ b/spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java
@@ -226,6 +226,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 	 * Create a new AbstractApplicationContext with no parent.
 	 */
 	public AbstractApplicationContext() {
+		// 调用父类构造方法，设置类加载器
 		// 设置资源解析器，默认实现为 PathMatchingResourcePatternResolver
 		this.resourcePatternResolver = getResourcePatternResolver();
 	}
@@ -318,6 +319,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 	@Override
 	public ConfigurableEnvironment getEnvironment() {
 		if (this.environment == null) {
+			// 创建并返回一个新的StandardEnvironment
 			this.environment = createEnvironment();
 		}
 		return this.environment;
@@ -329,6 +331,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 	 * a custom {@link ConfigurableEnvironment} implementation.
 	 */
 	protected ConfigurableEnvironment createEnvironment() {
+		// 实例化StandardEnvironment对象，并设置java所使用属性资源 customizePropertySources
 		return new StandardEnvironment();
 	}
 
diff --git a/spring-context/src/main/java/org/springframework/context/support/AbstractRefreshableConfigApplicationContext.java b/spring-context/src/main/java/org/springframework/context/support/AbstractRefreshableConfigApplicationContext.java
index 35d2cfc..d909c80 100644
--- a/spring-context/src/main/java/org/springframework/context/support/AbstractRefreshableConfigApplicationContext.java
+++ b/spring-context/src/main/java/org/springframework/context/support/AbstractRefreshableConfigApplicationContext.java
@@ -123,6 +123,7 @@ public abstract class AbstractRefreshableConfigApplicationContext extends Abstra
 	 * @see org.springframework.core.env.Environment#resolveRequiredPlaceholders(String)
 	 */
 	protected String resolvePath(String path) {
+		// 创建上下文的Environment，并解析配置文件名
 		return getEnvironment().resolveRequiredPlaceholders(path);
 	}
 
diff --git a/spring-context/src/main/java/org/springframework/context/support/ClassPathXmlApplicationContext.java b/spring-context/src/main/java/org/springframework/context/support/ClassPathXmlApplicationContext.java
index ca98496..e10b101 100644
--- a/spring-context/src/main/java/org/springframework/context/support/ClassPathXmlApplicationContext.java
+++ b/spring-context/src/main/java/org/springframework/context/support/ClassPathXmlApplicationContext.java
@@ -139,6 +139,7 @@ public class ClassPathXmlApplicationContext extends AbstractXmlApplicationContex
 			throws BeansException {
 		// 初始化父类属性值以及设置资源解析器
 		super(parent);
+		// 设置上下文环境，并解析配置文件
 		setConfigLocations(configLocations);
 		if (refresh) {
 			refresh();
diff --git a/spring-core/src/main/java/org/springframework/core/env/AbstractPropertyResolver.java b/spring-core/src/main/java/org/springframework/core/env/AbstractPropertyResolver.java
index c3f29e1..4375c55 100644
--- a/spring-core/src/main/java/org/springframework/core/env/AbstractPropertyResolver.java
+++ b/spring-core/src/main/java/org/springframework/core/env/AbstractPropertyResolver.java
@@ -205,6 +205,7 @@ public abstract class AbstractPropertyResolver implements ConfigurablePropertyRe
 	@Override
 	public String resolveRequiredPlaceholders(String text) throws IllegalArgumentException {
 		if (this.strictHelper == null) {
+			// 创建PlaceholderHelper组件，用于解析配置文件名，如设置${前缀等等...
 			this.strictHelper = createPlaceholderHelper(false);
 		}
 		return doResolvePlaceholders(text, this.strictHelper);
-- 
Gitee