编译之前

Gradle安装

这里我用的是Mac，比较简单：
```
brew install gradle
```
测试是否安装完成：
```
gradle -v
```
拉取Spring源码

访问GitHub的Spring框架页面，获取git链接（这里使用Gitee的镜像）
```
git clone https://gitee.com/mirrors/Spring-Framework.git
```
拉取完成后，进入目录，首先康康里面的导入文档

我决定使用IDEA，所以打开import-into-idea.md

编译

已知的问题

spring-core and spring-oxm should be pre-compiled due to repackaged dependencies.
See *RepackJar tasks in the build and https://youtrack.jetbrains.com/issue/IDEA-160605).
spring-aspects does not compile due to references to aspect types unknown to
IntelliJ IDEA. See https://youtrack.jetbrains.com/issue/IDEA-64446 for details. In the meantime, the 'spring-aspects' can be excluded from the project to avoid compilation errors.
While JUnit tests pass from the command line with Gradle, some may fail when run from
IntelliJ IDEA. Resolving this is a work in progress. If attempting to run all JUnit tests from within IntelliJ IDEA, you will likely need to set the following VM options to avoid out of memory errors:
-XX:MaxPermSize=2048m -Xmx2048m -XX:MaxHeapSize=2048m
If you invoke "Rebuild Project" in the IDE, you'll have to generate some test
resources of the spring-oxm module again (./gradlew :spring-oxm:compileTestJava)

步骤：

修改部分配置

早就知道Spring借助Gradle编译因为网络的原因需要非常长的时间。于是打开Spring项目根目录的gradle.build，在默认的Maven仓库URL前加入阿里的仓库

repositories {
   maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }
   maven { url 'https://maven.aliyun.com/repository/google' }
   maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
   maven { url 'https://maven.aliyun.com/repository/jcenter'}
   maven { url "http://repo.springsource.org/plugins-release" }
   mavenCentral()
   maven { url "https://repo.spring.io/libs-spring-framework-build" }
   maven { url "https://repo.spring.io/snapshot" } // Reactor
   maven { url "https://oss.jfrog.org/artifactory/oss-snapshot-local" } // RSocket
}

并且，看到有博客说过高的JDK版本可能不利于Spring的编译，于是我特别准备了JDK8：

导入IDEA

导入即开始构建，于是报错：

注释部分代码：

再次尝试编译：

行吧，换种思路，不用IDEA进行编译。

在命令行预编译spring-oxm

q@qs-MacBook-Pro Spring-Framework % ./gradlew :spring-oxm:compileTestJava

再次尝试IDEA编译

从报错的语句可以看出应该是从阿里的Gradle插件仓库下载的文件有问题，所以尝试将阿里Gradle插件仓库移除：

（注释掉即可）

再次尝试：

十几分钟之后完成了构建。

玄学，玄学

测试

在Spring源码根目录下新建一个spring-mycode模块：右击项目 New->Module->Gradle

首先，为mycode模块导入Spring的context模块。编辑mycode模块的build.gradle：

在mycode下新建一个MyConfig作为配置类，User作为一个普通的实体类，MyApplication作为应用启动入口。

MyConfig：

@Configuration
public class MyConfig {
 @Bean
 public User user(){
     return new User("靓仔");
 }
}

User:

public class User {
 private String name;
 public User(String name) {
     this.name = name;
 }
 @Override
 public String toString() {
     return "User{" +
             "name='" + name + '\'' +
             '}';
 }
}

MyApplication：

public class MyApplication {
 public static void main(String[] args) {
     AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(MyConfig.class);
     User bean = annotationConfigApplicationContext.getBean(User.class);
     System.out.println(bean);
 }
}

运行结果：