编译spring源码步骤详解（一）

编译spring源码步骤详解

spring项目根目录有gradlew.bat 文件，可以直接点击gradlew.bat文件进行编译，但推荐你cmd命令行输入gradlew.bat 查看编译状态

第一步：拉取spring源码

spring官网支持gradle 编译，首先从github上拉取自己需要的spring分支https://github.com/spring-projects/spring-framework（我的spring-framework 分支版本是：v5.1.12.RELEASE ） ，建议使用git clone 拉取。

没有使用git clone拉取源码编译报的错

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 8m 55s
Build scan background action failed.
org.gradle.process.internal.ExecException: Process 'command 'git'' finished with non-zero exit value 128
        at org.gradle.process.internal.DefaultExecHandle$ExecResultImpl.assertNormalExitValue(DefaultExecHandle.java:417)
        at org.gradle.process.internal.DefaultExecAction.execute(DefaultExecAction.java:38)
        at org.gradle.process.internal.DefaultExecActionFactory.exec(DefaultExecActionFactory.java:168)
        at io.spring.ge.conventions.gradle.WorkingDirectoryProcessOperations.exec(WorkingDirectoryProcessOperations.java:45)
        at io.spring.ge.conventions.gradle.ProcessOperationsProcessRunner.run(ProcessOperationsProcessRunner.java:41)
        at io.spring.ge.conventions.core.BuildScanConventions.run(BuildScanConventions.java:166)
        at io.spring.ge.conventions.core.BuildScanConventions.addGitMetadata(BuildScanConventions.java:113)
        at io.spring.ge.conventions.gradle.GradleConfigurableBuildScan.lambda$background$0(GradleConfigurableBuildScan.java:104)
        at com.gradle.enterprise.gradleplugin.internal.extension.b$3.run(SourceFile:101)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

git clone 后不再报该错误。

第二步：下载gradle（配置相关…）

2.1选择对的gradle版本

选择编译需要的gradle版本，判断依据项目目录内的gradle-wrapper.properties配置。（图片为已编译完成的项目结构）

注： 这里是为了说明如何确认spring 分支gradle版本 ，可忽略分支版本差异

主要看distributionUrl 值，distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
因此需要下载6.5.1的版本。

• 下载gradle 地址：https://gradle.org/releases
• gradle帮助文档地址（使用介绍等，错误解决）：https://help.gradle.org

gradle版本错误出现的报错

gradle和spring 版本一定要对的上，否则gradlew.bat 执行失败：Caused by: org.gradle.internal.resource.transport.http.HttpErrorStatusCodeException: Could not HEAD 'https://repo.spring.io/plugins-release/io/spring/gradle-enterprise-conventions/io.spring.gradle-enterprise-conventions.gradle.plugin/0.0.2/io.spring.gradle-enterprise-conventions.gradle.plugin-0.0.2.jar'. Received status code 401 from server: Unauthorized

命令行 执行gradlew.bat 看详细报错命令：gradlew.bat --stacktrace

Downloading https://services.gradle.org/distributions/gradle-6.8.3-bin.zip
..........10%..........20%..........30%...........40%..........50%..........60%..........70%...........80%..........90%..........100%

Welcome to Gradle 6.8.3!

Here are the highlights of this release:
 - Faster Kotlin DSL script compilation
 - Vendor selection for Java toolchains
 - Convenient execution of tasks in composite builds
 - Consistent dependency resolution

For more details see https://docs.gradle.org/6.8.3/release-notes.html

Starting a Gradle Daemon (subsequent builds will be faster)

FAILURE: Build failed with an exception.

* Where:
Build file 'C:\Study\spring\spring-framework\build.gradle' line: 305

* What went wrong:
Could not compile build file 'C:\Study\spring\spring-framework\build.gradle'.
> startup failed:
  build file 'C:\Study\spring\spring-framework\build.gradle': 305: unexpected token: } @ line 305, column 1.
     }
     ^

  1 error


* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 52s

A build scan was not published as you have not authenticated with server 'ge.spring.io'.

2.2 修改gradle-wrapper.properties配置文件

修改前：

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
// 下载gradle-6.5.1-bin 版本
distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

修改配置文件

distributionBase=GRADLE_USER_HOME
// 执行gradlew.bat编译命令后 生成的文件存放路径
distributionPath=wrapper/dists
// 改成自己下载到本地的gradle压缩包地址
distributionUrl=file\:///C\:/SofeFile/gradle-6.5.1-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

distributionUrl 修改为自己已下载的gradle压包地址，后面执行编译命令 会从C:/SofeFile/gradle-6.5.1-bin.zip 下载gradle

gradle-wrapper.properties 配置属性解释

1. 去 C\:/SofeFile/gradle-6.5.1-bin.zip 下载gradle-6.5.1版本，只包含binary的版本。
2. 下载的gradle-6.5.1-bin.zip存放到C:\Users\\.gradle\wrapper\dists目录中。
   （注：具体还有2级目录，即全路径为C:\Users\\.gradle\wrapper\dists\gradle-3.1-bin\\，gradle-6.5.1-bin目录是根据下载的gradle的文件名来定的，目录名是根据distribution url路径字符串计算md5值得来的，具体参考PathAssembler.java中的rootDirName()和getHash()，PathAssembler.java的位置见本文最后的参考路径）
3. 解压gradle-6.5.1-bin.zip，将解压后的文件存放到C:\Users.gradle\wrapper\dists中。（注：具体还有2级目录，同上）

例如me：用户名为哈哈

• 默认存放地址为：C:\Users\哈哈\.gradle\wrapper\dists,
• 目录名为98dayp9c8wecb8izhag7k5iak
• 全目录名：C:\Users\哈哈\.gradle\wrapper\dists\gradle-6.5.1-bin\98dayp9c8wecb8izhag7k5iak

执行gradlew.bat 后，会从file\:///C\:/SofeFile/gradle-6.5.1-bin.zip下载gradle 到C:\Users\哈哈\.gradle\wrapper\dists\gradle-6.5.1-bin\98dayp9c8wecb8izhag7k5iak目录，并解压

选择正确的版本后

2.3配置gradle远程仓库地址（修改build.gradle文件）

执行gradlew.bat 后，扫描 自动下载完gradle之后会通过gradle去编译spring源码；这里就涉及到一个gradle的中央仓库的问题了，编译过程中会下载大量的依赖；如果你采用默认的依赖那么这个编译过程一定特别漫长；而且会失败；于是我们需要修改中央仓库为国内的阿里云；这样就会快很多；
修改build.gradle 文件

		repositories {
			mavenCentral()
			maven { url "https://repo.spring.io/libs-spring-framework-build" }
			maven { url "https://repo.spring.io/milestone" } // Reactor
			// 添加下面两个
			maven {url 'https://maven.aliyun.com/nexus/content/groups/public/'} //阿里云
			maven {url 'https://maven.aliyun.com/nexus/content/repositories/jcenter'}
		}

2.4 修改settings.gradle文件（不做身份验证）

plugins {
	id "com.gradle.enterprise" version "3.2"
	// 注解后，就不会再进行身份验证了
	// id "io.spring.gradle-enterprise-conventions" version "0.0.2"
}

未使用ge.spring.io服务进行身份验证

执行多次博报错

A build scan was not published as you have not authenticated with server ‘ge.spring.io’. 报错

第三步：第开始编译

所有的操作都执行后，就可以直接编译spring源码啦，同上 cmd命令行输入 gradlew.bat 。

执行结果：

篇幅太长 后面的内容在下一篇编译spring源码（二）

参考网址：
https://blog.csdn.net/qq_46119030/article/details/114229263