spring3-Getting Started

Building Java Projects with Maven

本篇介绍如何使用Maven，与spring暂时没有关系

首先需要编写POM

下面的例子中引入了一个joda-time.jar和一个可执行JAR的插件maven-shade-plugin

pom.xml

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.gc</groupId>
  <artifactId>spring3</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>spring3</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.10</version>
      <scope>test</scope>
    </dependency>
    
    <!-- 处理日期时间很方便的一个工具 -->
	<dependency>
		<groupId>joda-time</groupId>
		<artifactId>joda-time</artifactId>
		<version>2.3</version>
	</dependency>
    
  </dependencies>
  
   <build>
        <plugins>
        	<!-- 可执行jar插件：即，可以通过java -jar 命令可以执行的jar文件 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.1</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer
                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <!-- 指定入口函数所在的类路径，即主函数main()所在的类路径 -->
                                    <mainClass>hello.HelloWorld</mainClass>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

2个类文件

package hello;

public class Greeter {
	public String sayHello() {
		return "Hello world!";
	}
}

package hello;

import org.joda.time.LocalTime;

public class HelloWorld {
	public static void main(String[] args) {
		
		System.out.println(args[0]);
		
		LocalTime currentTime = new LocalTime();
		System.out.println("The current local time is: " + currentTime);
		
		Greeter greeter = new Greeter();
		System.out.println(greeter.sayHello());
	}
}

通过Maven进行编译和打包，生成jar文件

在target目录下，将生成1个可执行jar和1个普通jar

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spring3Demo-0.0.1-SNAPSHOT-shaded.jar

spring3Demo-0.0.1-SNAPSHOT.jar

打开CMD窗口，输入：

C:\Users\Administrator>java -jar E:\project\spring3\target\spring3-0.0.1-SNAPSHOT-shaded.jar hellowold

[命令最后的'helloworld'是传入main函数的参数，被args[]所接收]

 

由于是可执行jar，使用java -jar命令即可执行，得到结果：

hellowold
The current local time is: 23:45:35.198
Hello world!