如何使用BufferedReader的line.split方法讀取Java String？

Question

我想讀取一個文本文件，並將一些必需的值存儲為java字符串。

我正在使用Bufferedreader讀取和存儲值。 我插入了一行，其中包含：可能的值是

NAME: lastname, firstname *CONTRACTOR*
NAME:
NAME: Sapi, Raj J.
NAME: Alle Peter, Shortley Swara

從上面我只需要姓和名。 有時，此值根本不存在。 在那種情況下，如何驗證“名稱”行是否具有值？ 為此，我使用下面的代碼引發Nullpointer異常。

BufferedReader br = new BufferedReader(new InputStreamReader(
            (conn.getInputStream())));
    String line;
    while ((line = br.readLine()) != null) {
        if (line.contains("CNUM")) {
            cnum = line.split(" ")[1];
            // break;
        }
        if (line.contains("NAME")) {
            name = line.split(" ")[2];
        }
    }

Answer 1

您可能想要這樣的東西...

    BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
    String line;
    while ((line = br.readLine()) != null) {
        if (line.contains("CNUM")) {
            cnum = line.split(" ")[1];
            // break;
        }
        if (line.trim().startsWith("NAME:")) {

            line = line.replace("NAME:", "");
            line = line.trim();
            if (line.contains(",")){
                String[] contractorName = line.split(",");
                String lastName = contractorName[0].trim();
                String firstName = contractorName[1].trim();
                // use the last name and first name as you wish here.
            } else {
                // line doesn't contain a first and last name for contractor.  invalid data.
                continue;
            }
        }
    }