菜单
4.2.14 JAVA PLUGIN节点
插件扩展任务任务节点（具体开发方式可参考插件开发文档）
Source类插件任务：作为数据流的起点，可以“输出”数据到下游
插件任务样例"Json_RawData"：可以将Json解析转化为数据输出
Processor类插件任务：作为数据流的中间加工环节，可以将“输入”的数据处理后产生“输出”数据
插件任务样例"数据加密"：可以将输入数据中指定的列按照指定算法进行加密并产生“输出”数据
Target类插件任务：作为数据流的终点，在接收到“输入”的数据后可以输出到外部系统
插件任务样例"CSV数据打印"：可以将输入数据以CSV的格式打印到任务实例的日志中去（最多10000行）
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