jsp留言板源代码二:给jsp初学者_MySQL

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内容图文

guestbook.jsp
===========================










<%@ page contentType="text/html; charset=GB2312" %>
<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="testInq" scope="page" "ymbean.opDb" />
<%
int pages=1;
int pagesize=10;
else if(inquire_item==4) inquire_itemt="lw_title";
lwhere=lwhere+" and "+inquire_itemt+" like '%"+inquire_value+"%
'";
lurlt=lurlt+"range="+inquire_item+"&findstr="+inquire_value+"&"
;

} catch (Exception e) {}

try{
//取得参数 留言内容
lw_ String(request.getParameter("gbname").getBytes("ISO885
9_1"));
lw_title=new String(request.getParameter("lw_title").getBytes("ISO88
59_1"));
lw_author=new String(request.getParameter("lw_author").getBytes("ISO
8859_1"));
pagetitle=new String(request.getParameter("pagetitle").getBytes("ISO
8859_1"));
author_http=new String(request.getParameter("author_http").getBytes(
"ISO8859_1"));
author_email=new String(request.getParameter("author_email").getByte
s("ISO8859_1"));
lw_ico=request.getParameter("gifface");
lw_content=new String(request.getParameter("lw_content").getBytes("I
SO8859_1"));
String requestMethod=request.getMethod();
requestMethod=requestMethod.toUpperCase();
if(requestMethod.indexOf("POST")<0)
{ out.print("非法操作!");
return;
}

//形成其他数据项
author_ip=request.getRemoteAddr() ;
lw_time=testInq.getCurrentDate("yyyyMMddHHmmss");
lw_"2";
lw_type=""+"z"; //主贴
zt_time=lw_time;
zt_author=lw_author;
answer_num=0;
click_num=0;
//================
st="','";
//保证留言所有数据项的长度在正常范围内
if(lw_title.length()>50) lw_title=lw_title.substring(0,50);
if(lw_author.length()>20) lw_author=lw_author.substring(0,20);
if(author_http.length()>40) author_http=author_http.substring(0,40);

if(author_email.length()>50) author_email=author_email.substring(0,4
0);
if(lw_content.length()>4000) lw_content=lw_content.substring(0,4000)
;

insertsql="insert into guestbook values('"+lw_title+st+lw_author+st+
author_http+st+
author_email+st+lw_ico+st+lw_time+"',"+answer_num+","+cli
ck_num+",'"+
author_ip+st+lw_class1+st+lw_class2+st+lw_type+st+zt_time
+st+zt_author+st+
lw_content+"')";
//out.print(insertsql);
//插入留言
try{
String lmsg=testInq.executeUpdate(insertsql);
if(lmsg.indexOf("executeUpdate ok")<0)
out.print("lmsg="+lmsg);

}catch (Exception e) { out.print("错误:"+e);}
} catch (Exception e) {}
%>

<%
//验证留言输入项合法性的javascript
String ljs=" ";
out.print(ljs);
%>

<%
//留言板界面首部
String ltop=" ";
out.print(ltop);
%>

<%
//显示最近时间发表的一页留言
countsql="select count(lw_title) from guestbook "+lwhere;
inqsql ="select lw_title,answer_num,click_num,lw_author,lw_time,expres
sion,"+
" author_email,lw_class1,lw_class2 from guestbook "+lwhere+" o
rder by lw_time desc" ;

if(pages>0)
{
try {
try{
ResultSet rcount=testInq.executeQuery(countsql);
if(rcount.next())
{
count = rcount.getInt(1);
}
rcount.close();
} catch (Exception el1) { out.println("count record error
: "+el1+"
" );
out.println(countsql);
}

totalpages=(int)(count/pagesize);
if(count>totalpages*pagesize) totalpages++;
st=""+
" 0 width=\"95%\"> "+
"

00%\">"+ " 共 "+totalpages+" 页，"+count+" 条. "+" 当前页: "+pages+ "

";

out.print(st);

//out.print(" 共 "+totalpages+" 页，"+
count+" 条. "+" 当前页: "+pages+"
");

st=" "+
" "+
" "+
" "+
" "+
" "+
" "+
" "+
" ";
out.print(st);

if(count > 0 )
{
ResultSet rs = testInq.executeQuery(inqsql);
ResultSetMetaData metaData = rs.getMetaData();

int i;
// 跳过pages -1 页,使cursor指向pages并准备显示
for(i=1;i<=(pages - 1)*pagesize;i++) rs.next();
//显示第pages页开始
String linestr="";
for(i=1;i<=pagesize;i++)
if(rs.next())
{
lw_title=rs.getString("lw_title");
answer_num=rs.getInt("answer_num");
click_num=rs.getInt("click_num");
lw_author=rs.getString("lw_author");
lw_time=rs.getString("lw_time");
st=lw_time.substring(0,4)+"-"+lw_time.substring(4,6)+"-"
+lw_time.substring(6,8)+":"+
lw_time.substring(8,10)+":"+lw_time.substring(10,12)+
":"+lw_time.substring(12,14);
lw_ico=rs.getString("expression");
author_email=rs.getString("author_email");
lw_.getString("lw_class1");
lw_.getString("lw_class2");
llink="reply.jsp?lw_"+lw_
"+lw_time+
"&zt_author="+author_email;
linestr=" \n" +
" "+
" "+
" "+
" "+
" ";

out.println(linestr);

}
rs.close();
//显示第pages页结束
st="

" color=#ffffff>留言主题	" color=#ffffff>回应数	" color=#ffffff>点击数	" color=#ffffff>作者名	" color=#ffffff>发表/回应时间
"> " href=\""+llink+" \">"+lw_title+"	["+answer_num+"]	"+click_num+"	il+"\">"+lw_author+"	"+st+"

";
out.print(st);

int iFirst=1,iLast=totalpages,iPre,iNext;
if(pages<=1) iPre=1;
else iPre=pages - 1;

if(pages>=totalpages) iNext=totalpages;
else iNext=pages + 1;

int n=(int)(count/pagesize);
if(n*pagesize if(n>1)
{
//for(i=1;i<=n;i++) out.print(" "+i+">"+i+" ");
//out.print("

---

">");
String lt1="返回主页",lt2="第一页",lt3="上一页",lt4="下一
页",lt5="最后一页",lt6="";
lt6=""+ lt1 + " a>"+
lurlt + "pages="+iFirst+">"+lt2+"&nbs
p; "+
lurlt + "pages="+iPre+">"+lt3+"
" +
lurlt + "pages="+iNext+">"+lt4+"
; " +
lurlt + "pages="+iLast+">"+lt5+"
; ";
st=""+
" 0 width=\"95%\"> "+
"

00%\">"+ lt6+ "

";

out.print(st);

}

}
} catch (Exception e) { out.println("error: "+e); }
}


%>


<%
//留言板界面尾部
String lbottom="";
lbottom=lbottom+
" \n"+
"