怎么把clob字段转换为字符串

import java.sql.Clob;
import java.sql.ResultSet;
import java.sql.SQLException;

public class ClobToString {
    public static String clobToString(Clob clob) throws SQLException {
        StringBuilder sb = new StringBuilder();
        // 获取CLOB字段的内容长度
        int length = (int) clob.length();
        // 以流的形式读取CLOB字段的内容
        try (java.io.Reader reader = clob.getCharacterStream()) {
            char[] buffer = new char[length];
            int bytesRead;
            // 逐个字符读取并添加到字符串构建器中
            while ((bytesRead = reader.read(buffer)) != -1) {
                sb.append(buffer, 0, bytesRead);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        // 假设存在一个ResultSet对象，包含了一列名为"clob_column"的CLOB字段
        ResultSet rs = null;
        try {
            // 从ResultSet中获取CLOB字段
            Clob clob = rs.getClob("clob_column");
            // 将CLOB字段转换为字符串
            String content = clobToString(clob);
            System.out.println(content);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}