From 0e779f3cb88b9d0d1646352636f98a034c025b78 Mon Sep 17 00:00:00 2001
From: qibaoguang <qibaoguang@gmail.com>
Date: Fri, 20 Mar 2015 00:40:34 +0800
Subject: [PATCH] Update 17. Spring Beans and dependency injection.md

---
 .... Spring Beans and dependency injection.md | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/III. Using Spring Boot/17. Spring Beans and dependency injection.md b/III. Using Spring Boot/17. Spring Beans and dependency injection.md
index e69de29..59ba903 100644
--- a/III. Using Spring Boot/17. Spring Beans and dependency injection.md	
+++ b/III. Using Spring Boot/17. Spring Beans and dependency injection.md	
@@ -0,0 +1,27 @@
+### 17. Spring Beans和依赖注入
+
+你可以自由地使用任何标准的Spring框架技术去定义beans和它们注入的依赖。简单起见，我们经常使用`@ComponentScan`注解搜索beans，并结合`@Autowired`构造器注入。
+
+如果使用上面建议的结构组织代码（将应用类放到根包下），你可以添加`@ComponentScan`注解而不需要任何参数。你的所有应用程序组件（`@Component`, `@Service`, `@Repository`, `@Controller`等）将被自动注册为Spring Beans。
+
+下面是一个`@Service` Bean的示例，它使用构建器注入获取一个需要的`RiskAssessor` bean。
+```java
+package com.example.service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class DatabaseAccountService implements AccountService {
+
+    private final RiskAssessor riskAssessor;
+
+    @Autowired
+    public DatabaseAccountService(RiskAssessor riskAssessor) {
+        this.riskAssessor = riskAssessor;
+    }
+
+    // ...
+}
+```
+**注**：注意如何使用构建器注入来允许`riskAssessor`字段被标记为`final`，这意味着`riskAssessor`后续是不能改变的。