輸出格式

print

import org.apache.flink.api.common.functions.MapFunction; import org.apache.flink.streaming.api.datastream.DataStreamSource; import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;public class PrintTest {public static void main(String[] args) throws Exception {StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();DataStreamSource<String> dataStreamSource = env.readTextFile("D:\\ifeng\\flinkTest\\src\\main\\java\\com\\ifeng\\zgx\\exercise\\data\\hello.txt");SingleOutputStreamOperator<String> map = dataStreamSource.map(new MapFunction<String, String>() {@Overridepublic String map(String value) throws Exception {return value.split("\t")[0];}});map.print();env.execute("PrintTest");} }

file

import org.apache.flink.api.common.functions.MapFunction; import org.apache.flink.streaming.api.datastream.DataStreamSource; import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;public class TextTest {public static void main(String[] args) throws Exception {StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();DataStreamSource<String> dataStreamSource = env.readTextFile("xxx\hello.txt");SingleOutputStreamOperator<String> map = dataStreamSource.map(new MapFunction<String, String>() {@Overridepublic String map(String value) throws Exception {String[] splits = value.split("\t");return splits[0] + "nihao" + splits[1];}});map.writeAsText("xxx\hello_w.txt").setParallelism(1);env.execute("Text test");} }

addSink

PrintSink

import org.apache.flink.api.common.functions.MapFunction; import org.apache.flink.streaming.api.datastream.DataStreamSource; import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;public class PrintSinkTest {public static void main(String[] args) throws Exception {StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();DataStreamSource<String> dataStreamSource = env.readTextFile("xxx\hello.txt");SingleOutputStreamOperator<String> map = dataStreamSource.map(new MapFunction<String, String>() {@Overridepublic String map(String value) throws Exception {return value.split("\t")[0];}});map.addSink(new PrintSinkFunction<>());env.execute("PrintTest");} }

總結

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