flink wordcount 代码

好的，我可以为您提供 Flink WordCount 代码，以下是一个简单的示例：

import org.apache.flink.api.java.utils.ParameterTool;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

public class WordCount {
    public static void main(String[] args) throws Exception {
        // set up the execution environment
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        // get input data
        DataStream<String> text = env.readTextFile("input.txt");

        // transform the data
        DataStream<WordCount> counts =
                text.flatMap(new Tokenizer())
                        .keyBy("word")
                        .sum("count");

        // output the results
        counts.print();

        // execute program
        env.execute("Streaming WordCount");
    }

    // user-defined class that extracts words from a line of text
    public static final class Tokenizer implements FlatMapFunction<String, WordCount> {

        @Override
        public void flatMap(String value, Collector<WordCount> out) {
            // normalize and split the line of text
            String[] tokens = value.toLowerCase().split("\\W+");

            // emit the pairs
            for (String token : tokens) {
                if (token.length() > 0) {
                    out.collect(new WordCount(token, 1));
                }
            }
        }
    }

    // user-defined class to represent a word and its count
    public static final class WordCount {
        public String word;
        public int count;

        public WordCount() {}

        public WordCount(String word, int count) {
            this.word = word;
            this.count = count;
        }

        @Override
        public String toString() {
            return word + " : " + count;
        }
    }
}

这个程序会读取一个名为 "input.txt" 的文本文件，然后进行单词计数，并将结果输出到标准输出。请注意，您需要替换 input.txt 为您自己的文件路径。