每日博客——使用Maven对Java独立应用程序进行编译打包

使用Maven对Java独立应用程序进行编译打包

1. 安装Maven

网盘下载 apache-maven-3.9.2-bin.zip

链接为：https://pan.baidu.com/s/181shkgg-i0WEytQMqeeqxA（提取码：9ekc ）

sudo unzip /export/server/apache-maven-3.9.2-bin.zip -d /export/server/
cd /export/server/
sudo mv apache-maven-3.9.2/ ./maven
sudo chown -R hadoop ./maven

2. Java应用程序代码

cd /export/server
mkdir -p  sparkapp2/src/main/java

在 ./sparkapp2/src/main/java 下建立一个名为 SimpleApp.java 的文件（vim ./sparkapp2/src/main/java/SimpleApp.java），添加代码如下：

import org.apache.spark.api.java.*;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.SparkConf;
 
public class SimpleApp {
    public static void main(String[] args) {
        String logFile = "file:///export/server/spark/README.md"; // Should be some file on your system
        SparkConf conf=new SparkConf().setMaster("local").setAppName("SimpleApp");
        JavaSparkContext sc=new JavaSparkContext(conf);
        JavaRDD<String> logData = sc.textFile(logFile).cache(); 
        long numAs = logData.filter(new Function<String, Boolean>() {
            public Boolean call(String s) { return s.contains("a"); }
        }).count(); 
        long numBs = logData.filter(new Function<String, Boolean>() {
            public Boolean call(String s) { return s.contains("b"); }
        }).count(); 
        System.out.println("Lines with a: " + numAs + ", lines with b: " + numBs);
    }
}

该程序依赖Spark Java API,因此我们需要通过Maven进行编译打包。在./sparkapp2目录中新建文件pom.xml，命令如下：

cd /export/server/sparkapp2
vim pom.xml

在pom.xml中添加相关依赖

<project>
    <groupId>cn.edu.xmu</groupId>
    <artifactId>simple-project</artifactId>
    <modelVersion>4.0.0</modelVersion>
    <name>Simple Project</name>
    <packaging>jar</packaging>
    <version>1.0</version>
    <repositories>
        <repository>
            <id>jboss</id>
            <name>JBoss Repository</name>
            <url>http://repository.jboss.com/maven2/</url>
        </repository>
    </repositories>
    <dependencies>
        <dependency> <!-- Spark dependency -->
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.12</artifactId>
            <version>3.4.0</version>
        </dependency>
    </dependencies>
</project>

3.使用Maven打Java程序

cd ~/sparkapp2
/export/server/maven/bin/mvn package

如出现下信息，说明生成Jar包成功：

参考博客：https://dblab.xmu.edu.cn/blog/4322/