<%!private void tree(Set<Article> articles, Connection con, int id, int grade) {
String sql = "select * from article where pid = " + id;
Statement stmt = DB.createStmt(conn);
ResultSet rs = DB.executeQuery(stmt, sql);
try {
while (rs.next()) {
Article a = new Article();
a.setId(rs.getInt("id"));
a.setPid(rs.getInt("pid"));
a.setRootId(rs.getInt("rootid"));
a.setTitle(rs.getString("title"));
a.setLeaf(rs.getInt("isleaf") == 0 ? true : false);
a.setPdate(rs.getTimestamp("pdate"));
a.setGrade(grade + 1);
articles.add(a);
if (!a.isLeaf()) {
tree(articles, conn,a.getId(), grade + 1);
}
}
} catch (SQLException e) {
e.printStackTrace();
}
}%>
<%
Set<Article> articles = new HashSet<Article>();
Connection conn = DB.getConn();
tree(articles, conn, 0, 0);
DB.close(conn);
%>
不太会提问，我是跟着尚学堂BBS2007做下来的，其中在树状结构展现1的视频中，遇到上述问题，出现红色字体，有错误，报错如下：
严重: Error compiling file: /C:/Program Files/Apache Software Foundation/Tomcat 5.0/work/Catalina/localhost/ShoolWeb//org/apache/jsp\bbs_jsp.java [javac] Compiling 1 source file
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\ShoolWeb\org\apache\jsp\bbs_jsp.java:16: 找不到符号
符号： 变量 conn
位置： 类 org.apache.jsp.bbs_jsp
Statement stmt = DB.createStmt(conn);
^
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\ShoolWeb\org\apache\jsp\bbs_jsp.java:30: 找不到符号
符号： 变量 conn
位置： 类 org.apache.jsp.bbs_jsp
tree(articles, conn,a.getId(), grade + 1);
^
2 错误
我按照视频做的 ，其他的也封装好了，找不出问题，求助高手了~~~~~
------解决方案--------------------------------------------------------
Connection con,
Statement stmt = DB.createStmt(conn);
对比一下，con == conn ？
------解决方案--------------------------------------------------------