mysql注入 无回显

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class SafeQueryExample {
    public static void main(String[] args) {
        String userInput = "userInput"; // 假设这是用户输入
        String query = "SELECT * FROM users WHERE username = ?";

        try (Connection conn = getConnection();
             PreparedStatement pstmt = conn.prepareStatement(query)) {

            pstmt.setString(1, userInput);
            ResultSet rs = pstmt.executeQuery();

            while (rs.next()) {
                // 处理结果集
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    private static Connection getConnection() throws SQLException {
        // 获取数据库连接的代码
        return null;
    }
}