rsKey.next();
int key = rsKey.getInt(1); // 拿到第一个字段，那个自动递增的null
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<%@ page import="java.sql.*" %>
<%
request.setCharacterEncoding("gbk");
String action = request.getParameter("action");
if(action != null && action.equals("post")) {
String title = request.getParameter("title");
String cont = request.getParameter("cont");
cont = cont.replaceAll("
" , "<br>");
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
conn.setAutoCommit(false);
String sql = "insert into article values (null, 0, ?, ?, ?, now(), 0)";
PreparedStatement pstmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
Statement stmt = conn.createStatement();
pstmt.setInt(1, -1);
pstmt.setString(2, title);
pstmt.setString(3, cont);
pstmt.executeUpdate();
ResultSet rsKey = pstmt.getGeneratedKeys();
rsKey.next();
int key = rsKey.getInt(1); // 拿到第一个字段，那个自动递增的null
rsKey.close();
stmt.executeUpdate("update article set rootid = " + key + " where id = " + key);
conn.commit();
conn.setAutoCommit(true);
stmt.close();
pstmt.close();
conn.close();
response.sendRedirect("ShowArticleFlat.jsp");
}
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<title>Insert title here</title>
</head>
<body>
<form action="Post.jsp" method="post">
<input type="hidden" name="action" value="post">
<table border="1">
<tr>
<td>
<input type="text" name="title" size="80">
</td>
</tr>
<tr>
<td>
<textarea cols="80" rows="12" name="cont"></textarea>
</td>
</tr>
<tr>
<td>
<input type="submit" value="提交">
</td>
</tr>
</table>
</form>
</body>
</html>