例题描述和简单分析

有 txt 文件 txt.txt，如下：

a brown frog leaps over a lazy dog

the dog then chases it's own tail

the tail is long and brown

the brown frog goes for a swim

3

某文本文件共 N+1 行，其中第 N+1 行是个数字 M，比如 3。现在要据此生成新文件，将 N 行重复 M 遍，即共 N*M 行，结果如下：

a brown frog leaps over a lazy dog

the dog then chases it's own tail

the tail is long and brown

the brown frog goes for a swim

a brown frog leaps over a lazy dog

the dog then chases it's own tail

the tail is long and brown

the brown frog goes for a swim

a brown frog leaps over a lazy dog

the dog then chases it's own tail

the tail is long and brown

the brown frog goes for a swim

解法及简要说明

在集算器中编写脚本 p1.dfx，如下所示：

简要说明：

A1  读取 txt 数据，@i 表示结果集只有 1 列时返回成序列

A2  把除去最后一个成员的序列复制最后一个成员的整数份

A3  复制后的结果导出至 result.txt

JAVA 集成这段代码的方法可参考：《Java 如何调用 SPL 脚本》。

问答搜集

https://stackoverflow.com/questions/54896519/reading-int-value-from-text-file-and-using-value-to-alter-file-contents-to-sepa