Question

我有一个csv文件是＆＃39; |＆＃39;分隔，并有多行。文件中的某些条目有重复项，我需要将这些条目合并为一行。然后，这些条目将用于创建地图对象。我是java的新手，需要有关如何执行此操作的帮助。我创建了一个地图对象，但不知道如何处理重复项。谁能建议如何在java中做到这一点？

我的清单：

HR |325|50051710|CN=ADGroup1

HR |325|50051710|CN=ADGroup2

BA |375|50110084|CN=ADGroup1

SYS ADMIN |877|50145471|CN=ADGroup2

输出必须像这样被读作地图对象：

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

BA |375|50110084|CN=ADGroup1
...

我的代码：

     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);

Answer 1

我制作了这段代码，我相信它可以解决你的问题（让我知道它是否确实如此）：

{

    String tempString, group;
    Map<String, String> myMap = new HashMap<String, String>();
    List<String> myList; 

    myList = createListFromFile("myFile.txt");      

    for(String string : myList){
        tempString = string.substring(0, string.lastIndexOf('|'));
        group = string.substring(string.lastIndexOf('|'), string.length());
        if(myMap.containsKey(tempString)){
            //substring is used here to remove '|' character
            myMap.put(tempString, myMap.get(tempString) +","+group.substring(1, group.length()));
        }else{
            myMap.put(tempString, tempString + group);
        }
    }

    //For testing
    for (Map.Entry<String,String> entry : myMap.entrySet()) {
        System.out.println("key = "+entry.getKey()); 
        System.out.println("value = "+entry.getValue());
    }
}

public static List<String> createListFromFile(String path){

    //you might need to change the Charset
    Charset charsetUTF8 = Charset.forName("UTF-8");
    List<String> lines = null;
    try {
        lines = Files.readAllLines(Paths.get(path), charsetUTF8);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return lines;

}

如何将多个行项目与重复项合并为java中的单行？

1 个答案: