Question

我从数据库中提取数据并试图操纵结果字符串：

public class Main {
    public static void main(String[] args) {
        Connection sqlConn = connectSQL();
        ResultSet rs;
        Statement select;
        try {
            select = sqlConn.createStatement();
            rs = select
                    .executeQuery("SELECT DISTINCT TSK.PointPerson FROM Task AS TSK LEFT JOIN [User] AS USR ON USR.DisplayName = TSK.PointPerson WHERE USR.DisplayName IS NULL AND TSK.PointPerson IS NOT NULL");
            while (rs.next()) {
                String displayName = rs.getString(1);
                System.out.println(displayName);
                if (displayName.contains("(")) {
                    String[] splittedString = displayName.split("(");
                }

            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

我在这一行收到错误：String[] splittedString = displayName.split("(");

Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed group near index 1
(
 ^
    at java.util.regex.Pattern.error(Unknown Source)
    at java.util.regex.Pattern.accept(Unknown Source)
    at java.util.regex.Pattern.group0(Unknown Source)
    at java.util.regex.Pattern.sequence(Unknown Source)
    at java.util.regex.Pattern.expr(Unknown Source)
    at java.util.regex.Pattern.compile(Unknown Source)
    at java.util.regex.Pattern.<init>(Unknown Source)
    at java.util.regex.Pattern.compile(Unknown Source)
    at java.lang.String.split(Unknown Source)
    at java.lang.String.split(Unknown Source)
    at Main.main(Main.java:21)

我不明白为什么会这样。如果我删除该行它工作正常。我得到的结果如下：

Dipankar XYZ(pradhand)
Rocky XYZ

正如你所看到的，有些人有'（'而有些人没有。我试图用我的if语句来容纳这个。

我做错了什么？

Answer 1

split使用正则表达式作为参数，(是正则表达式元字符，在本例中为groups。要使其成为文字，您需要使用split("\\(")或split("[(]")来转义它。

无法使用Java正确拆分字符串

1 个答案: