提示程序包不存在

[xujian595]

C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:3:45 java: 程序包org.apache.flink.api.common.functions不存在 C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:4:36 java: 程序包org.apache.flink.api.java.io不存在 C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:5:49 java: 程序包org.apache.flink.streaming.api.datastream不存在 C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:6:50 java: 程序包org.apache.flink.streaming.api.environment不存在 C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:7:53 java: 程序包org.apache.flink.streaming.api.functions.sink不存在 C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:8:55 java: 程序包org.apache.flink.streaming.api.functions.source不存在 C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:9:53 java: 程序包org.apache.flink.streaming.api.windowing.time不存在 C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:34:15 java: 找不到符号 符号: 类 StreamExecutionEnvironment 位置: 类 com.sparrowrecsys.nearline.flink.RealTimeFeature C:\Users\xu\Downloads\SparrowRecSys-master\SparrowRecSys-master\src\main\java\com\sparrowrecsys\nearline\flink\RealTimeFeature.java:34:48 java: 找不到符号 符号: 变量 StreamExecutionEnvironment 位置: 类 com.sparrowrecsys.nearline.flink.RealTimeFeature

[xujian595]

已解决

[xylovezxy]

请问是如何解决的