使用 Maven 执行 java main class(java应用程序)

今天突然想练练自己脱离IDE的 hard code 水平，于是只是用 maven & UE 做了一些练习，突然发现了一个问题，如何使用maven指令执行 java main 呢？一开始想了一个比较直接的解决方式，直接使用 java 指令：

java -cp target/classes org.ts.App

但这样明显比较麻烦...，以前跑测试时，一条指令解决所有问题，像这样：

mvn clean compile test

但现在应为要用到 java ... ，所以要下两次指令...

 

那么 maven 就不能执行 java main 吗？显然 maven 不可能这么弱，google一下.. 果然发现了已经有现成的博文了：http://www.vineetmanohar.com/2009/11/02/3-ways-to-run-java-main-from-maven/

 

博文是E文的，但很简单，说明的也蛮详细，这里不再赘述。

不过列出以下maven指令集，无需编写任何代码，初学者可依次执行指令，就能看到结果：

mvn archetype:create -DgroupId=org.ts.main -DartifactId=ts-main
cd ts-main
mvn compile
mvn exec:java -Dexec.mainClass="org.ts.main.App"

依次执行后，能看到如下的结果：

C:\Users\Timothy\ts-main>mvn exec:java -Dexec.mainClass="org.ts.main.App"
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'exec'.
[INFO] ------------------------------------------------------------------------
[INFO] Building ts-main
[INFO]    task-segment: [exec:java]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing exec:java
[INFO] No goals needed for project - skipping
[INFO] [exec:java {execution: default-cli}]
Hello World!
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1 second
[INFO] Finished at: Mon May 10 02:53:50 CST 2010
[INFO] Final Memory: 5M/15M
[INFO] ------------------------------------------------------------------------

 

如果需要编辑App.java，完成后，直接使用以下指令即可看到结果：

mvn clean compile exec:java -Dexec.mainClass="org.ts.main.App"

 

比如我将"Hello world!" 修改为"Hello Timothy!"后，则只要按一次 [上档]+[Enter]，即可看到执行结果：

C:\Users\Timothy\ts-main>mvn clean compile exec:java -Dexec.mainClass="org.ts.main.App"
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'exec'.
[INFO] ------------------------------------------------------------------------
[INFO] Building ts-main
[INFO]    task-segment: [clean, compile, exec:java]
[INFO] ------------------------------------------------------------------------
[INFO] [clean:clean {execution: default-clean}]
[INFO] Deleting directory C:\Users\Timothy\ts-main\target
[INFO] [resources:resources {execution: default-resources}]
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory C:\Users\Timothy\ts-main\src\main\resources
[INFO] [compiler:compile {execution: default-compile}]
[INFO] Compiling 1 source file to C:\Users\Timothy\ts-main\target\classes
[INFO] Preparing exec:java
[INFO] No goals needed for project - skipping
[INFO] [exec:java {execution: default-cli}]
Hello Timothy!
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Mon May 10 02:58:33 CST 2010
[INFO] Final Memory: 10M/26M
[INFO] ------------------------------------------------------------------------

 

好，先到这里... 希望对初学者有所帮助..