如何对文本文件中的记录进行排序以及如何使用 Java 打印其他 txt 文件？

Question

Some amendments to the data in the text file. I have tried the suggested code but I'm not successfully writing it again in the txt file with this format. I've tried the collection. sort but it writes the data in long lines.

My txt file contains these data:

PID1,POND^AMY,F,19890224 PID2,WILLIAMS^RORY,M,19881102 PID3,POND^AMY,F,19890224 PID4,POND^AMY,F,20010911

How can I sort those data in ascending order and store them again in a txt file after sorting?

0: PID1,POND^AMY,F,19890224 PID3,POND^AMY,F,19890224 PID4,POND^AMY,F,20010911 1: PID2,WILLIAMS^RORY,M,19881102

Answer 1

You can easily sort records in a text file and export the result to another txt file with esProc SPL (a java based open-source scripting language for data processing):

IIUC,the data.txt like this:

PID1,POND^AMY,F,19890224 PID2,WILLIAMS^RORY,M,19881102 PID3,POND^AMY,F,19890224 PID4,POND^AMY,F,20010911

and you wanna sort records by the 2nd field(POND^AMY,WILLIAMS^RORY) and the result.txt like this:

0: PID1,POND^AMY,F,19890224 PID3,POND^AMY,F,19890224 PID4,POND^AMY,F,20010911 1: PID2,WILLIAMS^RORY,M,19881102

SPL code:

=file("result.txt").write(file("data.txt").read().split(" ").group(~.split@c()(2)).((#-1)/": "/~.concat(" ")).concat(" "))

SPL offers JDBC driver to be invoked by Java. Just store the above SPL script as sort.splx and invoke it in a Java application as you call a stored procedure:

...
Class.forName("com.esproc.jdbc.InternalDriver");
con = DriverManager.getConnection("jdbc:esproc:local://");
st = con.prepareCall("call sort.splx()");
st.execute();
...

with

<!-- https://mvnrepository.com/artifact/com.scudata.esproc/esproc -->
<dependency>
    <groupId>com.scudata.esproc</groupId>
    <artifactId>esproc</artifactId>
    <version>20220402</version>
</dependency>

You can also execute the SPL code within a Java program as we execute a SQL statement:

...
st = con.prepareStatement("==file(\"result.txt\").export@c(file(\"data.txt\").import@c().sort(_2))");
st.execute();
...

Or if your txt actually is a csv format like this:

PID1,POND^AMY,F,19890224
PID2,WILLIAMS^RORY,M,19881102
PID3,POND^AMY,F,19890224
PID4,POND^AMY,F,20010911

and you wanna get the result.txt like this:

PID1,POND^AMY,F,19890224
PID3,POND^AMY,F,19890224
PID4,POND^AMY,F,20010911
PID2,WILLIAMS^RORY,M,19881102

use this SPL code:

=file("result.txt").export@c(file("data.txt").import@c().sort(_2))