jsp留言板源代码二: 给jsp初学者.


答案：作 者: precom (皮蛋) 2000.12.10

guestbook.jsp 
=========================== 
<html><head> 
<META content="text/html; charset=gb2312 " http-equiv=Content-Type> 

<title>张家界电话黄页(网上114)</title></head> 
<style type="text/css"> 
<!-- 
BODY { FONT-FAMILY: "宋体","Arial Narrow", "Times New Roman"; FONT-SI 
ZE: 9pt } 
.p1 { FONT-FAMILY: "宋体", "Arial Narrow", "Times New Roman"; FONT-SIZ 
E: 12pt } 
A:link { COLOR: #00793d; TEXT-DECORATION: none } 
A:visited { TEXT-DECORATION: none } 
A:hover { TEXT-DECORATION: underline} 
TD { FONT-FAMILY: "宋体", "Arial Narrow", "Times New Roman"; FONT-SIZE 
: 9pt } 
.p2 { FONT-FAMILY: "宋体", "Arial Narrow", "Times New Roman"; FONT-SIZ 
E: 9pt; LINE-HEIGHT: 150% } 
.p3 { FONT-FAMILY: "宋体", "Arial Narrow", "Times New Roman"; FONT-SIZ 
E: 9pt; LINE-HEIGHT: 120% } 

--> 
</style> 


<body> 


<%@ page contentType="text/html; charset=GB2312" %> 
<%@ page language="java" import="java.sql.*" %> 
<jsp:useBean id="testInq" scope="page" class="ymbean.opDb" /> 
<% 
int pages=1; 
int pagesize=10; 
int count=0; 
int totalpages=0; 

String countsql="",inqsql="",lwhere="",insertsql="",st=""; 

String lw_title="",lw_author="",pagetitle="",author_http="",author_e 
mail="",lw_ico="", 
lw_content="",lw_class1=""; 
String author_ip="",lw_time="",lw_class2="",lw_type="",zt_time="",zt 
_author=""; 
int answer_num=0,click_num=0; 
int inquire_item=1; 
String inquire_itemt="",inquire_value=""; 
String lurlt="<a href=>
lwhere=" where lw_type='z' "; //只显示主贴 

/* 
Enumeration e = request.getParameterNames(); 
while (e.hasMoreElements()) { 
String name = (String) e.nextElement(); 
*/ 
try{ 
//取显示的页页序数 
pages = new Integer(request.getParameter("pages")).intValue(); 
} catch (Exception e) {} 
try{ 
//取查询参数 
inquire_item=new Integer(request.getParameter("range")).intValu 
e(); 
inquire_value=new String(request.getParameter("findstr").getByt 
es("ISO8859_1")); 
if(inquire_item==0) inquire_itemt="lw_title"; 
else if(inquire_item==1) inquire_itemt="lw_content"; 
else if(inquire_item==2) inquire_itemt="lw_author"; 
else if(inquire_item==3) inquire_itemt="lw_time"; 
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_class1=new 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_class2="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=" <SCRIPT language=JavaScript> \n"+ 
" <!-- \n"+ 
" function ValidInput() \n"+ 
" {if(document.sign.lw_author.value==\"\") \n"+ 
" {alert(\"请填写您的大名。\"); \n"+ 
" document.sign.lw_author.focus(); \n"+ 
" return false;} \n"+ 
" if(document.sign.lw_title.value==\"\") \n"+ 
" {alert(\"请填写留言主题。\"); \n"+ 
" document.sign.lw_title.focus(); \n"+ 
" return false;} \n"+ 
" if (document.sign.author_email.value!=\"\") \n"+ 
" { if ((document.sign.author_email.value.indexOf(\"@\")<0)//(document 
.sign.author_email.value.indexOf(\":\")!=-1)) \n"+ 
" {alert(\"您填写的EMail无效，请填写一个有效的Email!\"); \n"+ 
" document.sign.author_emaill.focus(); \n"+ 
" return false; \n"+ 
" } \n"+ 
" } \n"+ 
" return true; \n"+ 
" } \n"+ 
" function ValidSearch() \n"+ 
" { if(document.frmsearch.findstr.value==\"\") \n"+ 
" {alert(\"不能搜索空串！\"); \n"+ 
" document.frmsearch.findstr.focus(); \n"+ 
" return false;} \n"+ 
" } \n"+ 
" //--> \n"+ 
" </SCRIPT> "; 
out.print(ljs); 
%> 

<% 
//留言板界面首部 
String ltop=" <DIV align=center> \n"+ 
" <CENTER> \n"+ 
" <FORM action=guestbook.jsp method=post name=frmsearch> \n"+ 
" <INPUT name=gbname type=hidden value=cnzjj_gt> \n"+ 
" <TABLE align=center border=0 cellSpacing=1 width=\"95%\"> \n"+ 
" <TBODY> \n"+ 
" <TR> \n"+ 
" <TD bgColor=#336699 colSpan=2 width=\"100%\"> \n"+ 
" <P align=center><FONT color=#ffffff face=楷体_GB2312 \n"+ 
" size=5>欢迎远方的朋友来张家界旅游观光</FONT></P></TD></
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