请教各位大神，遍历数据库 为什么只有一条数据,里面明明有两条数据，哪位大神帮忙看看

<%
Connection con;
Statement stmt;
ResultSet rs;
Class.forName("com.mysql.jdbc.Driver");
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
String DbConn = "jdbc:mysql://localhost/test";
String DbPass="343296580";
con = java.sql.DriverManager.getConnection(DbConn,"root",DbPass);
stmt = con.createStatement();
rs = stmt.executeQuery("select * from words");

 ResultSetMetaData data=rs.getMetaData();   

    ArrayList<HashMap<String,String>> al = new ArrayList<HashMap<String,String>>();  
    HashMap<String,String> map = new HashMap<String,String>();  
while(rs.next())

while (rs.next()) {

            for (int i = 1; i <= data.getColumnCount(); i++) { // 数据库里从 1 开始

                String c = data.getColumnName(i);

                String v = rs.getString(c);


                map.put(c, v);
            }

            al.add(map);

        }

out.println(al);

stmt.close();
con.close();

%>

结果是： [{id=2, chword=学校, enword=school}]

为什么循环是从一开始的呢 ？是从0开始的吧