Flink输出算子
一，Flink程序通用结构
二，使用输出算子输出结果到文件
需要在项目的根目录下创建目录output
package com.xxx.demo;
import org.apache.flink.api.common.serialization.SimpleStringEncoder;
import org.apache.flink.configuration.MemorySize;
import org.apache.flink.connector.file.sink.FileSink;
import org.apache.flink.core.fs.Path;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.funct