【问题】

I have a csv file that is ‘|’ delimited and has multiple lines in it. Some entries in the file have duplicates and I need to merge these entries into a single line. These entries will then be used to create a map object. I am new to java and need help on how to do this.. I created a map object but don’t know how to handle the duplicates. Can anyone suggest how to do this in java?

My list:

HR |325|50051710|CN=ADGroup1

HR |325|50051710|CN=ADGroup2

BA |375|50110084|CN=ADGroup1

SYS ADMIN |877|50145471|CN=ADGroup2

Output has to be like this to be read as map object:

HR |325|50051710|CN=ADGroup1,CN=ADGroup2

BA |375|50110084|CN=ADGroup1

...

My code:

 Map attrList = new HashMap();

 String[] record = line.split("\\|");

 try{

 br1 = new BufferedReader(new FileReader(inputFile));

 String line = "";

 while ((line = br1.readLine()) != null) {

 if (record[1] != null ) {

 Map map = new HashMap();

 String costcentre = record[1].trim();

 map.put("Costcentre", costcentre);

 String jobcode = record[2].trim();

 map.put("Jobcode", jobcode);

 String adgroup = record[3].trim();

 map.put("ADGroup", adgroup);

 attrList.put(costcentre + jobcode, map);

【回答】

这里需要进行简单的结构化计算：按照第 1、2、3 列分组，再将组内的第 4 列用逗号拼在一起。但 JAVA 缺乏相关的类库，实现过程复杂，代码可读性差。这种情况可以用集算器辅助实现，代码更直观易懂：

A1: 用分隔符 "|" 读取文件。

A2: 按前 3 列分组，再将每组 (即 ~) 的第 4 列用逗号拼在一起。

集算器提供 JDBC 接口，可以像数据库一样使用，Java 如何调用 SPL 脚本。