在上一节中,我们介绍了如何使用 archetype 创建 Maven 项目,接下来我们介绍如何构建和测试这个项目。
构建项目
查看 helloMaven 项目的 pom.xml 文件,配置如下。
- <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
- <modelVersion>4.0.0</modelVersion>
- <groupId>net.jhelp.www</groupId>
- <artifactId>helloMaven</artifactId>
- <packaging>jar</packaging>
- <version>1.0-SNAPSHOT</version>
- <name>helloMaven</name>
- <url>http://maven.apache.org</url>
- <dependencies>
- <dependency>
- <groupId>junit</groupId>
- <artifactId>junit</artifactId>
- <version>3.8.1</version>
- <scope>test</scope>
- </dependency>
- </dependencies>
- </project>
从以上配置可知,Maven 已经添加了 Junit 作为该项目的测试框架,且 Maven 也在项目中自动生成了一个源码文件 App.java 和一个测试文件 AppTest.java 。
打开命令行窗口,跳转到 D:\maven\helloMaven 目录,执行以下 mvn 命令,对该项目进行构建。
命令执行结果如下:
- [INFO] Scanning for projects...
- [INFO]
- [INFO] --------------------< net.jhelp.www:helloMaven >--------------------
- [INFO] Building helloMaven 1.0-SNAPSHOT
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ helloMaven ---
- [INFO] Deleting D:\maven\helloMaven\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ helloMaven ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\maven\helloMaven\src\main\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ helloMaven ---
- [INFO] Changes detected - recompiling the module!
- [WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
- [INFO] Compiling 1 source file to D:\maven\helloMaven\target\classes
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ helloMaven ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\maven\helloMaven\src\test\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ helloMaven ---
- [INFO] Changes detected - recompiling the module!
- [WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
- [INFO] Compiling 1 source file to D:\maven\helloMaven\target\test-classes
- [INFO]
- [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ helloMaven ---
- [INFO] Surefire report directory: D:\maven\helloMaven\target\surefire-reports
- Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.pom
- Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.pom (1.7 kB at 1.3 kB/s)
- Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.jar
- Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.jar (26 kB at 51 kB/s)
- -------------------------------------------------------
- T E S T S
- -------------------------------------------------------
- Running net.jhelp.www.AppTest
- Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.007 sec
- Results :
- Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
- [INFO]
- [INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ helloMaven ---
- [INFO] Building jar: D:\maven\helloMaven\target\helloMaven-1.0-SNAPSHOT.jar
- [INFO] ------------------------------------------------------------------------
- [INFO] BUILD SUCCESS
- [INFO] ------------------------------------------------------------------------
- [INFO] Total time: 4.775 s
- [INFO] Finished at: 2021-03-02T17:20:15+08:00
- [INFO] ------------------------------------------------------------------------
项目构建完成后,在该项目根目录中生成了一个名为 target 的目录,该目录包含以下内容。
图1:target 目录
说明:
- Maven 命令中包含了两个命令:clean 和 package,其中 clean 负责清理 target 目录,package 负责将项目构建并打包输出为 jar 文件。
- classes:源代码编译后存放在该目录中。
- test-classes:测试源代码编译后并存放在该目录中。
- surefire-reports:Maven 运行测试用例生成的测试报告存放在该目录中。
- helloMaven-1.0-SNAPSHOT.jar:Maven 对项目进行打包生成的 jar 文件。
打开命令控制台,跳转到 D:\maven\helloMaven\target\classes 目录,执行 Java 命令
执行结果如下。
测试项目
下面我们介绍如何在 Maven 项目中添加其他的 Java 文件,并进行测试。
打开 D:\maven\helloMaven\src\main\java\net\biancheng\www 文件夹,在其中创建一个名为 Util.java 的文件。
- package net.jhelp.www;
- @author
- public class Util {
- public static void printMessage(String message) {
- System.out.println(message);
- }
- }
更新 App 类,调用 Util 类中的 printMessage() 方法,代码如下。
- package net.jhelp.www;
- @author
- public class App {
- public static void main(String[] args) {
- Util.printMessage("编程帮欢迎您,网址:www.jhelp.net");
- }
- }
打开命令行窗口,跳转到 D:\maven\helloMaven 目录,并执行如下 Maven 命令,对项目进行编译。
命令执行结果如下。
- [INFO] Scanning for projects...
- [INFO]
- [INFO] --------------------< net.jhelp.www:helloMaven >--------------------
- [INFO] Building helloMaven 1.0-SNAPSHOT
- [INFO] --------------------------------[ jar ]---------------------------------
- [INFO]
- [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ helloMaven ---
- [INFO] Deleting D:\maven\helloMaven\target
- [INFO]
- [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ helloMaven ---
- [WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
- [INFO] skip non existing resourceDirectory D:\maven\helloMaven\src\main\resources
- [INFO]
- [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ helloMaven ---
- [INFO] Changes detected - recompiling the module!
- [WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
- [INFO] Compiling 2 source files to D:\maven\helloMaven\target\classes
- [INFO] ------------------------------------------------------------------------
- [INFO] BUILD SUCCESS
- [INFO] ------------------------------------------------------------------------
- [INFO] Total time: 0.853 s
- [INFO] Finished at: 2021-03-03T09:26:29+08:00
- [INFO] ------------------------------------------------------------------------
编译成功后,跳转到 D:\maven\helloMaven\target\classes 目录下,执行以下 Java 命令。
执行结果如下。