Flink 流处理API 1. Environment 1.1 getExecutionEnvironment 创建一个执行环境，表示当前执行程序的上下文。如果程序是独立调用的，则此方法返回本地执行环境；如果从命令行客户端调用程序以提交到集群，则此方法返回此集群的执行环境，也就是说，getExecutionEnvironment会根据查询运行的方式决定返回什么样的运行环境，是最常用的一种创建执行环境的方式。 1ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); 2StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); 1.2 createLocalEnvironment 1LocalStreamEnvironment env = StreamExecutionEnvironment.createLocalEnvironment(1); 1.3 createRemoteEnvironment 1StreamExecutionEnvironment env = StreamExecutionEnvironment.createRemoteEnvironment("jobmanage-hostname", 6123,"YOURPATH//WordCount.jar"); 2. Source 2.1 集合 1StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); 2env.setParallelism(1); 3 4// 从集合里读取数……

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