flink统计每个人的总成绩样例打包执行代码

以下是一个使用 Flink 统计每个人的总成绩的样例代码：

import org.apache.flink.api.common.functions.AggregateFunction;
import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.util.Collector;

public class ScoreTotal {
    public static void main(String[] args) throws Exception {
        ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        // 读取成绩数据，每行数据格式为：姓名 成绩
        DataSet<String> scores = env.readTextFile("path/to/scores.txt");

        // 使用 flatMap 将每行数据转换成 Tuple2<姓名, 成绩>
        DataSet<Tuple2<String, Integer>> nameScores = scores.flatMap(new FlatMapFunction<String, Tuple2<String, Integer>>() {
            @Override
            public void flatMap(String value, Collector<Tuple2<String, Integer>> out) throws Exception {
                String[] fields = value.split(" ");
                out.collect(new Tuple2<>(fields[0], Integer.parseInt(fields[1])));
            }
        });

        // 使用 AggregateFunction 统计每个人的总成绩
        DataSet<Tuple2<String, Integer>> totalScores = nameScores
                .groupBy(0) // 按姓名分组
                .aggregate(new SumAggregateFunction()); // 使用自定义的 SumAggregateFunction 统计总成绩

        // 打印每个人的总成绩
        totalScores.print();
    }

    // 自定义的 AggregateFunction，用于计算总成绩
    public static class SumAggregateFunction implements AggregateFunction<Tuple2<String, Integer>, Tuple2<String, Integer>, Tuple2<String, Integer>> {
        @Override
        public Tuple2<String, Integer> createAccumulator() {
            return new Tuple2<>("", 0);
        }

        @Override
        public Tuple2<String, Integer> add(Tuple2<String, Integer> value1, Tuple2<String, Integer> value2) {
            return new Tuple2<>(value1.f0, value1.f1 + value2.f1);
        }

        @Override
        public Tuple2<String, Integer> getResult(Tuple2<String, Integer> accumulator) {
            return accumulator;
        }

        @Override
        public Tuple2<String, Integer> merge(Tuple2<String, Integer> a, Tuple2<String, Integer> b) {
            throw new UnsupportedOperationException();
        }
    }
}

你可以将你的成绩数据放在 `path/to/scores.txt` 文件中，每行一个人的成绩数据，格式为 `姓名 成绩`。运行以上代码后，会输出每个人的总成绩。