1 Spring 5源码下载

首先你的JDK需要升级到1.8以上版本。从Spring 3.0开始，Spring源码采用GitHub托管，不再提供官网下载链接。这里不做过多赘述，大家可自行去GitHub网站下载，我使用的版本下载链接为 https://github.com/spring-projects/spring-framework/archive/v5.0.2.RELEASE.zip ，下载完成后，解压源码包会看到如下图所示的文件目录。

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2 基于Gradle的源码构建技巧

由于从Spirng 5开始都采用Gradle编译，所以构建源码前需要先安装Gradle。Gradle下载地址为 https://gradle.org/releases ，我使用的是Spring 5官方推荐的版本Gradle 4.0，下载链接为https://gradle.org/next-steps/?version=4.0&format=bin ，下载完成后按以下步骤操作，这里以Windows操作系统为例。
第一步，配置环境变量，如下图所示。

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第二步，添加环境变量“%GRADLE_HOME%\bin”，如下图所示。

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第三步，检测环境，输入gradle -v命令，得到如下图所示结果。

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Gradle 4.0 
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Build time:2017-06-14 15:11:08 UTC
Revision: 316546a5fcb4e2dfe1d6aaÜb73a4e09e8cecb5a5 

Groovy:2. 4. 11
Ant:Apache Ant THD version 1. 9.6 compiled on June 29 2015
JVM:1.8.0_ 131 (Oracle Corporation 25.131-b11)
OS:Windows 10 10. 0 amd64

第四步，编译源码，将cmd切到spring-framework-5.0.2.RELEASE目录，运行gradlew.bat，如下图所示。

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StarTing a Gradle Daemon (subeequent builds wi11 be faster)

> Task :he1p

We1come to Gradle 4.3.1.

To run a build, run gradlew <task> ...

To see a list of available tasks, run gradlew tasks

To see a list of command-line options, run gradlew –Help

To see more detail about a task, run gradlew Help --task <task>

DUILD succesSPUL in 8s
1 actionable task: 1 executed

第五步，转换为Eclipse项目，执行import-into-eclipse.bat命令，构建前请确保网络状态良好，按任意键继续：

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Spring Framework - Eclipse/STS project impart guide

This script will guide you through the process of imporTing the Spring
Framerork projects into Ec1ipse or the Spring Tool Suite STS) it is
recommended that you have a recent version of Eclipse or STs. As a bare
minimum you wi11 need Eclipse with full Java 8 support, the AspectJ
Development Tools (AJDT), and the Groovy Compiler.

If you need to download and install Eclipse or STS, please do that now
by visiTing one of the following sites:

- Eclipse dommloads: http://dowload.eclipse.org/eclipse/dowloads
- STS dowmloads: http://spring.io/too1s/sts/a11
- STS nightly builds:http://dist.springsource.com/snapshot/STS/night1y-diStributions.html
- ADJT: http://www.eclipse.org/ajdt/downloads/
- Groovy Eclipse: https://github.com/groovy/groovy-eclipse/wiki

Otheryise. prgss enter and we’11 begin.
请按任意键继续. . .

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STEP 1: Generate subproject Eclipse metadata

The first step wil1 be to generate Eclipse project metadata for each
of the spring-* subprojects. This happens via the built-in
"Gradle wrapper" script (./gradlew in this directory). If this is your
first time using the Gradle wrapper, this step may take a fewr minutes
while a Gradle diStribution is downloaded for you.

第六步，等待构建成功（若中途出现错误，大部分情况是由于网络中断造成的，一般重试一下都能解决问题），构建成功后会出现如下信息：

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BUILD SUOCESSFUL in 6s
6 actionable tasks: 6 executed

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STEP 4: Import root project into Ec1ipse/STS

Follow the project inport steps listed in step 2 above to inport the 
root project.

Press. enter, when complete, and move on to the final step.
请按任意键继续. . .

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STEP 5: Enable Git support for all projects

- In the Ec1ipse/STS Package Exp1orer, se1ect al1 spring* projects.
- Right-click to cpen the context menu and SELEct Team > Share Project...
- In the Share Project dialog that appears, SELEct Git and press Next
- check "Use or create repository in parent folder of project"
- C1ick Finish

When complete, you' 11 have Git support enabled for all projects.

You' re ready to code! Goodbye!

到此为止，已经可以将项目导入Eclipse了。我们推荐使用的IDEA也比较智能，可以直接兼容Eclipse项目。接下来继续看下面的步骤。
第七步，导入IDEA。打开IntelliJ IDEA，单击“Import Project”，在弹出的界面中选择spring-framework-5.0.2.RELEASE文件夹，单击“OK”按钮，再单击“Finish”按钮，如下三图所示。

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