使用Gradle for Java插件生成一个Java类 [英] Generate a Java class using Gradle for Java plugin
问题描述
我想为 Java 项目使用Gradle任务生成一个Java类,类似于Android插件创建 BuildConfig.java
使用 buildConfig< String>
表示法,例如:
android {
...
buildTypes {
final String PROVIDER_AUTHORITY_RELEASE =public static final String PROVIDER_AUTHORITY = \com.example.project.ContentProvider \; \\\
;
final String PROVIDER_AUTHORITY_DEBUG =public static final String PROVIDER_AUTHORITY = \com.example.project.debug.ContentProvider \; \\\
;
debug {
...
buildConfig PROVIDER_AUTHORITY_DEBUG
}
版本{
...
buildConfig PROVIDER_AUTHORITY_RELEASE
}
}
}
用例是我正在开发一个需要使用API密钥和秘密的开源应用程序;我在 gradle.properties
中有个关键和秘密,它没有被提交给我的VCS。
到目前为止,我有这个:
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $' java / uk / co / ataulm / mijur / core / api)
outputs.dir outputDir
doFirst {
outputDir.exists()|| outputDir.mkdirs()
String API_CLIENT_ID =public static final String API_CLIENT_ID = \<您的imgur uk.co.ataulm.mijur.core.api客户端ID> \; \ n
字符串API_CLIENT_SECRET =公共静态最终字符串API_CLIENT_SECRET = \<您的imgur uk.co.ataulm.mijur.core.api客户端密钥> \; \\\
try {
API_CLIENT_ID =public static final String API_CLIENT_ID = \+ apiClientId +\; \\\
API_CLIENT_SECRET =public static final String API_CLIENT_SECRET = \ + apiClientSecret +\; \\\
} catch(Exception e){
printlngradle.properties没有用apiClientId和/或apiClientSecret设置,API调用不起作用。
}
新文件(outputDir,ApiConstants.java)。write(package uk.co.ataulm.mijur.core.api; \\\
\\\
public class ApiConstants { \\\
++ API_CLIENT_ID ++ API_CLIENT_SECRET +})
}
}
compileJava.source generateSources.outputs.files,sourceSets.main。 java
它的工作原理 - 它会在指定位置生成该文件。但它非常脆弱;明确命名该包很容易出错。如果文件是在其他包(例如 src / main / java
)的根目录下生成的,只要我可以在Java中访问它,使用 MyGeneratedFile.MyConstant
。
欣赏任何创意(即使它们在不同的轨道上)。
更优雅的方法是编写一个Gradle插件。
任务javaSourceGen(类型:com.somecompany.gensrc.GenerateSouce){
//传递适当的参数
}
compileJava.dependsOn(javaSourceGen)
然后在Gradle插件中,可以使用任何Java Source生成器项目。
例如: https://github.com/square / javapoet 或
http://codemodel.java.net/
I'd like to generate a Java class using a Gradle task for a Java project, similar to how the Android plugin creates BuildConfig.java
using the buildConfig <String>
notation, e.g.:
android {
...
buildTypes {
final String PROVIDER_AUTHORITY_RELEASE = "public static final String PROVIDER_AUTHORITY = \"com.example.project.ContentProvider\";\n";
final String PROVIDER_AUTHORITY_DEBUG = "public static final String PROVIDER_AUTHORITY = \"com.example.project.debug.ContentProvider\";\n";
debug {
...
buildConfig PROVIDER_AUTHORITY_DEBUG
}
release {
...
buildConfig PROVIDER_AUTHORITY_RELEASE
}
}
}
The use case is that I'm developing an open source app which requires the use of an API key and secret; I have the key and secret in gradle.properties
which isn't committed to my VCS.
So far, I have this:
task generateSources {
outputDir = file("$buildDir/../src/main/java/uk/co/ataulm/mijur/core/api")
outputs.dir outputDir
doFirst {
outputDir.exists() || outputDir.mkdirs()
String API_CLIENT_ID = "public static final String API_CLIENT_ID = \"<your imgur uk.co.ataulm.mijur.core.api client id>\";\n"
String API_CLIENT_SECRET = "public static final String API_CLIENT_SECRET = \"<your imgur uk.co.ataulm.mijur.core.api client secret>\";\n"
try {
API_CLIENT_ID = "public static final String API_CLIENT_ID = \"" + apiClientId + "\";\n"
API_CLIENT_SECRET = "public static final String API_CLIENT_SECRET = \"" + apiClientSecret + "\";\n"
} catch (Exception e) {
println "gradle.properties not set with apiClientId and/or apiClientSecret. API calls will not work.";
}
new File(outputDir, "ApiConstants.java").write("package uk.co.ataulm.mijur.core.api;\n\npublic class ApiConstants {\n" + " " + API_CLIENT_ID + " " + API_CLIENT_SECRET + "}")
}
}
compileJava.source generateSources.outputs.files, sourceSets.main.java
and it works - it generates that file at the specified location. But it's very fragile; explicitly naming the package is prone to error. I'd be happy if the file is generated in some other package (e.g. at the root of the src/main/java
) as long as I can access it in Java, using MyGeneratedFile.MyConstant
.
Appreciate any ideas (even if they are down a different track).
More elegant approach is to write a Gradle Plugin.
task javaSourceGen(type: com.somecompany.gensrc.GenerateSouce) {
//pass appropriate parameters
}
compileJava.dependsOn(javaSourceGen)
Then in the Gradle Plugin, Any Java Source generator project can be used.
For ex: https://github.com/square/javapoet or http://codemodel.java.net/
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