使用 Maven 执行 java main class(java应用程序)

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：

代码

    
    
    
    

     
     
     
     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：

代码

   
   
   
   

    
    
    
    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] 
    
    
    
    ------------------------------------------------------------------------