just a demo

<！-- demodemo.xml -->
<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-mapreduce-client-core</artifactId>
    <version>2.7.0</version>
</dependency>
<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-hdfs</artifactId>
    <version>2.7.0</version>
    </dependency>
<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-common</artifactId>
    <version>2.7.0</version>
</dependency>

<profiles>
        <profile>
            <id>id11111</id>
            <properties>
                <jar.name>xxxxx</jar.name>
                <main.class>mainxxxxx</main.class>
                <java.version>1.8</java.version>
            </properties>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-jar-plugin</artifactId>
                        <configuration>
                            <archive>
                                <manifest>
                                    <addClasspath>true</addClasspath>
                                    <classpathPrefix>lib</classpathPrefix>
                                    <!-- main函数 -->
                                    <mainClass>${main.class}</mainClass>
                                </manifest>
                            </archive>
                            <includes>
                                <include>com/rs/java/core/*.class</include>
                                <include>**/*.properties</include>
                            </includes>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>
        </profiles>

java  demo

Configuration conf = new Configuration();
String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();

Job job = Job.getInstance(conf, "jboname");
job.setJarByClass(AAA.class);
job.setOutputValueClass(Text.class);
job.setOutputKeyClass(Text.class);
job.setMapperClass(FirstMapper.class); //模式1,数据一天跑一次
job.setCombinerClass(FirstComb.class);
job.setReducerClass(FirstReducer.class);
job.setInputFormatClass(CombineSmallfileInputFormat.class);
FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
if(!job.waitForCompletion(true)) return ;