CMake编译java代码
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CMake to compile java code
提问by STiGMa
Is it possible to use CMake to compile and run java code?
是否可以使用 CMake 来编译和运行 Java 代码？
From command line the commands that I write on terminal is:
从命令行我在终端上写的命令是：
javac -classpath theClasspath mainClass.java
javac -classpath theClasspath mainClass.java
java -classpath theClasspath mainClass
java -classpath theClasspath mainClass
If so, could you please give me an idea of how this can be achieved?
如果是这样，您能否告诉我如何实现这一目标？
PS: I do not want to generate a jar file; just to compile the java class and if possible to run it.
PS：不想生成jar文件；只是为了编译java类，如果可能的话运行它。
Thanks.
谢谢。
Update: I have changed the command. I do not know why the additional text was not displayed. It might be because I used "<" and ">".
更新：我已经更改了命令。我不知道为什么没有显示附加文本。可能是因为我使用了“<”和“>”。
采纳答案by sakra
CMake has somewhat limited support for compiling Java code and executing Java class files.
CMake 对编译 Java 代码和执行 Java 类文件的支持有限。
The standard module FindJavacan be used to find a JDK installed on the local machine. The standard module UseJavaprovides a few functions for Java. Among those is a function add_jarto compile Java source files to a jar file.
标准模块FindJava可用于查找安装在本地机器上的 JDK。标准模块UseJava为 Java 提供了一些功能。其中包括 add_jar将 Java 源文件编译为 jar 文件的功能。
Here is a small example that demonstrates how to use add_jar. Given the Java sample source file HelloWorld.java:
这是一个演示如何使用add_jar. 鉴于 Java 示例源文件HelloWorld.java：
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
The following CMake list file will compile HelloWorld.javato a jar file HelloWorld.jarand also add a CMake test that runs the jar with the JVM:
以下 CMake 列表文件将编译HelloWorld.java为 jar 文件HelloWorld.jar，并添加一个 CMake 测试，该测试使用 JVM 运行 jar：
cmake_minimum_required (VERSION 2.8)
find_package(Java REQUIRED)
include(UseJava)
enable_testing()
project (HelloWorld NONE)
set(CMAKE_JAVA_COMPILE_FLAGS "-source" "1.6" "-target" "1.6")
add_jar(HelloWorld HelloWorld.java)
get_target_property(_jarFile HelloWorld JAR_FILE)
get_target_property(_classDir HelloWorld CLASSDIR)
message(STATUS "Jar file ${_jarFile}")
message(STATUS "Class compiled to ${_classDir}")
add_test(NAME TestHelloWorld COMMAND ${Java_JAVA_EXECUTABLE} -cp ${_jarFile} HelloWorld)
The CMake variable CMAKE_JAVA_COMPILE_FLAGScan be used to specify compile flags. As a side effect the add_jarcommand will set target properties JAR_FILEand CLASSDIRthat can be used to obtain the path to the generated jar file and the compiled class files directory, respectively.
CMake 变量CMAKE_JAVA_COMPILE_FLAGS可用于指定编译标志。作为副作用的add_jar命令将设置目标属性JAR_FILE和CLASSDIR可被用于获得的路径所产生的JAR文件和编译的类文件的目录，分别。
