环境 Tomcat + J SE + PostgreSQL
我将分几个步骤完成对一个新闻发布系统的构建 来理解JSP的一些基本使用方法！
首先我将先介绍这个新闻发布系统的基本结构
index jsp 管理员登陆界面 check jsp 验证管理员身份 main jsp 管理员添加新闻的页面 pub jsp 发布信息的页面 display 显示所有的新闻
而后台的程序主要有
DB java 数据库连接 MD java MD 算法 PubBean java 发布 CheckBean java 核实登陆身份
即当你从index >main >display 走一趟你基本就可以完成一个新闻发布系统的基本功能了！
我并非把新闻的标题和内容都写入数据库 因为那样太耗费数据库系统的资源 而且在访问的时候总要读取数
据库 很费劲 我把新闻写入了一个单独的HTM文件 之后把标题及HTM文件的名字写入的数据库！
而这个HTM文件的名字怎么随机生成呢？我选择了MD 算法 因为每个新闻的标题都不会相同 所以保证了唯一
性！
下面我先把这个系统的基本框架勾勒出来 说的大一点 这似乎就是这个“系统”的“内核”啦！:)
================数据库部分==================
CREATE TABLE administrator ( admin char( ) "password" char( ) ) WITHOUT OIDSALTER TABLE administrator OWNER TO admin
CREATE TABLE news ( title char( ) page char( ) ) WITHOUT OIDSALTER TABLE news OWNER TO admin
================程序部分==================
package login
import java sql *
public class DB {
private Connection conn private Statement stmt private ResultSet rs public DB() { try { Class forName(" postgresql Driver") conn = DriverManager getConnection
("jdbc:postgresql://localhost: /news?user=admin&&password=") stmt = conn createStatement() } catch(Exception e) { System out println(e) } } public void update(String sql) { try { stmt executeUpdate(sql) } catch(Exception e) { System out println(e) } } public ResultSet quarry(String sql) { try { rs = stmt executeQuery(sql) } catch(Exception e) { System out println(e) } return rs } }
package login
import java sql *import java io *
public class PubBean { private String title context private DB db private MD md public PubBean() { db = new DB() md = new MD () } public void setTitle(String title){ this title = title } public void setContext(String context) { this context = context }
public void pubIt() { try { title = new String(title getBytes(" _ ") "gb ") context = new String(context getBytes(" _ ") "gb ") String titleMD = md getkeyBeanofStr(title) db update("insert into news values( "+title+" "+titleMD +" )") String file = "news\\ice"+titleMD +" " PrintWriter pw = new PrintWriter(new FileOutputStream(file)) pw println("<title>"+title+"</title>") pw println(context) pw close() } catch(Exception e){ System out println(e) } } }
package login
import java sql *
public class CheckBean { private String message="" admin password private DB db public CheckBean() { db = new DB() } public void setAdmin(String admin){ this admin = admin } public void setPassword(String password) { this password = password } public String checkIt() { try { ResultSet rs = db quarry("select * from administrator where
admin= "+this admin+" ") while(rs next()){ String pws = rs getString("password") trim() if(pws equals(this password)){ message = "密码正确！" } else message = "密码错误！" return message } message = "用户不存在！" } catch(Exception e) { System out println(e) } return message } }
================页面部分==================
index jsp:
<%@ page contentType="text/charset=gb "%><><head><title>登陆系统</title></head><body><form name=login action="check jsp" method="post"> 用户 <input type=text name=admin><br> 密码 <input type=password name=password><br> <input type=submit value="登陆"><br></form></body></><% String error=request getParameter("error") error=new String(error getBytes(" _ ") "gb ") if(error==null) {} else{ %> <%=error%> <% } %>
check jsp
<%@ page contentType="text/charset=gb "%><%@ page import="login CheckBean"%><% String admin = request getParameter("admin") String password = request getParameter("password")%><jsp:useBean id="checkBean" class="login CheckBean"/><jsp:setProperty name=checkBean property="admin" value="<%= admin trim() %>"/><jsp:setProperty name=checkBean property="password" value="<%= password trim() %>"/><% String result = checkBean checkIt() if(result equals("密码正确！")){ session setAttribute("admin" admin) response sendRedirect("main jsp") } else { %> <jsp:forward page="index jsp"> <jsp:param name=error value="<%=result%>"/> </jsp:forward> <% } %>
main jsp
<%@ page contentType="text/charset=gb "%><% String admin =(String)(session getAttribute("admin")) if(admin==null){ response sendRedirect("index jsp") } else{ %><><head><title>新闻发布</title></head><body><form name=pub action="pub jsp" method="post"> 题目 <input type=text name=title><br> 内容 <textarea cols=" " rows=" " name=context></textarea><br> <input type=submit value="提交"><br></form></body></><%}%>
pub jsp
<%@ page contentType="text/charset=gb "%><% String admin = (String)(session getAttribute("admin")) String title = request getParameter("title") String context = request getParameter("context") if(admin == null){ response sendRedirect("index jsp") } else{ %> <jsp:useBean id="pubBean" class="login PubBean"/> <jsp:setProperty name=pubBean property="title" value="<%= title trim() %>"/> <jsp:setProperty name=pubBean property="context" value="<%= context %>"/> <% pubBean pubIt() response sendRedirect("display jsp") } %>
display jsp
<%@ page contentType="text/charset=gb "%><%@ page import="java sql *"%><% Class forName("sun jdbc odbc JdbcOdbcDriver") Connection conn=DriverManager getConnection("jdbc:odbc:PostgreSQL" "" "") Statement stmt=conn createStatement() %><><head><title>新闻</title></head><body><% ResultSet rs=stmt executeQuery("SELECT * FROM news") //显示记录 while(rs next()){ out print("<a href=news/ice"+rs getString( )+" target=_blank>"+rs getString
( )+"</a>") out println("<br>") } %></body></>
好了 基本的东西都实现了 希望现在已经可以给你一个完整的面貌了 在后面的文章中 我再把程序一步步
的完善 增加一些新的功能！
import java lang reflect *
public class MD { /* 下面这些S S 实际上是一个 * 的矩阵 在原始的C实现中是用#define 实现的 这里把它们实现成为static final是表示了只读 切能在同一个进程空间内的多个 Instance间共享*/ static final int S = static final int S = static final int S = static final int S =
static final int S = static final int S = static final int S = static final int S =
static final int S = static final int S = static final int S = static final int S =
static final int S = static final int S = static final int S = static final int S =
static final byte[] PADDING = { } /* 下面的三个成员是keyBean计算过程中用到的 个核心数据 在原始的C实现中 被定义到keyBean_CTX结构中
*/ private long[] state = new long[ ] // state (ABCD) private long[] count = new long[ ] // number of bits modulo ^ (l *** first) private byte[] buffer = new byte[ ]// input buffer
/* digestHexStr是keyBean的唯一一个公共成员 是最新一次计算结果的 进制ASCII表示 */ public String digestHexStr
/* digest 是最新一次计算结果的 进制内部表示 表示 bit的keyBean值 */ private byte[] digest = new byte[ ]
/* getkeyBeanofStr是类keyBean最主要的公共方法 入口参数是你想要进行keyBean变换的字符串 返回的是变换完的结果 这个结果是从公共成员digestHexStr取得的． */ public String getkeyBeanofStr(String inbuf) { keyBeanInit() keyBeanUpdate(inbuf getBytes() inbuf length()) keyBeanFinal() digestHexStr = "" for (int i = i <i++) { digestHexStr += byteHEX(digest[i]) } return digestHexStr
} // 这是keyBean这个类的标准构造函数 JavaBean要求有一个public的并且没有参数的构造函数 public MD () { keyBeanInit()
return }
/* keyBeanInit是一个初始化函数 初始化核心变量 装入标准的幻数 */ private void keyBeanInit() { count[ ] = L count[ ] = L ///* Load magic initialization constants
state[ ] = x L state[ ] = xefcdab L state[ ] = x badcfeL state[ ] = x L
return } /* F G H I 是 个基本的keyBean函数 在原始的keyBean的C实现中 由于它们是 简单的位运算 可能出于效率的考虑把它们实现成了宏 在java中 我们把它们 实现成了private方法 名字保持了原来C中的 */
private long F(long x long y long z) { return (x &y) | ((~x) &z)
} private long G(long x long y long z) { return (x &z) | (y &(~z))
} private long H(long x long y long z) { return x ^ y ^ z }
private long I(long x long y long z) { return y ^ (x | (~z)) }
/* FF GG HH和II将调用F G H I进行近一步变换 FF GG HH and II transformations for rounds and Rotation is separate from addition to prevent reputation */
private long FF(long a long b long c long d long x long s long ac) { a += F (b c d) + x + ac a = ((int) a <<s) | ((int) a >>>( s)) a += b return a }
private long GG(long a long b long c long d long x long s long ac) { a += G (b c d) + x + ac a = ((int) a <<s) | ((int) a >>>( s)) a += b return a } private long HH(long a long b long c long d long x long s long ac) { a += H (b c d) + x + ac a = ((int) a <<s) | ((int) a >>>( s)) a += b return a } private long II(long a long b long c long d long x long s long ac) { a += I (b c d) + x + ac a = ((int) a <<s) | ((int) a >>>( s)) a += b return a } /* keyBeanUpdate是keyBean的主计算过程 inbuf是要变换的字节串 inputlen是长度 这个 函数由getkeyBeanofStr调用 调用之前需要调用keyBeaninit 因此把它设计成private的 */ private void keyBeanUpdate(byte[] inbuf int inputLen) {
int i index partLen byte[] block = new byte[ ] index = (int)(count[ ] >>>) &x F // /* Update number of bits */ if ((count[ ] += (inputLen <<)) <(inputLen <<)) count[ ]++ count[ ] += (inputLen >>>)
partLen = index
// Transform as many times as possible if (inputLen >= partLen) { keyBeanMemcpy(buffer inbuf index partLen) keyBeanTransform(buffer)
for (i = partLeni + <inputLeni += ) {
keyBeanMemcpy(block inbuf i ) keyBeanTransform (block) } index =
} else
i =
///* Buffer remaining input */ keyBeanMemcpy(buffer inbuf index i inputLen i)
}
/* keyBeanFinal整理和填写输出结果 */ private void keyBeanFinal () { byte[] bits = new byte[ ] int index padLen
///* Save number of bits */ Encode (bits count )
///* Pad out to mod index = (int)(count[ ] >>>) &x f padLen = (index <) ? ( index) : ( index) keyBeanUpdate (PADDING padLen)
///* Append length (before padding) */ keyBeanUpdate(bits )
///* Store state in digest */ Encode (digest state )
}
/* keyBeanMemcpy是一个内部使用的byte数组的块拷贝函数 从input的inpos开始把len长度的 字节拷贝到output的outpos位置开始 */
private void keyBeanMemcpy (byte[] output byte[] input int outpos int inpos int len) { int i
for (i = i <leni++) output[outpos + i] = input[inpos + i] }
/* keyBeanTransform是keyBean核心变换程序 有keyBeanUpdate调用 block是分块的原始字节 */ private void keyBeanTransform (byte block[]) { long a = state[ ] b = state[ ] c = state[ ] d = state[ ] long[] x = new long[ ]
Decode (x block )
/* Round */ a = FF (a b c d x[ ] S xd aa L)/* */ d = FF (d a b c x[ ] S xe c b L)/* */ c = FF (c d a b x[ ] S x dbL)/* */ b = FF (b c d a x[ ] S xc bdceeeL)/* */ a = FF (a b c d x[ ] S xf c fafL)/* */ d = FF (d a b c x[ ] S x c aL)/* */ c = FF (c d a b x[ ] S xa L)/* */ b = FF (b c d a x[ ] S xfd L)/* */ a = FF (a b c d x[ ] S x d L)/* */ d = FF (d a b c x[ ] S x b f afL)/* */ c = FF (c d a b x[ ] S xffff bb L)/* */ b = FF (b c d a x[ ] S x cd beL)/* */ a = FF (a b c d x[ ] S x b L)/* */ d = FF (d a b c x[ ] S xfd L)/* */ c = FF (c d a b x[ ] S xa eL)/* */ b = FF (b c d a x[ ] S x b L)/* */
/* Round */ a = GG (a b c d x[ ] S xf e L)/* */ d = GG (d a b c x[ ] S xc b L)/* */ c = GG (c d a b x[ ] S x e a L)/* */ b = GG (b c d a x[ ] S xe b c aaL)/* */ a = GG (a b c d x[ ] S xd f dL)/* */ d = GG (d a b c x[ ] S x L)/* */ c = GG (c d a b x[ ] S xd a e L)/* */ b = GG (b c d a x[ ] S xe d fbc L)/* */ a = GG (a b c d x[ ] S x e cde L)/* */ d = GG (d a b c x[ ] S xc d L)/* */ c = GG (c d a b x[ ] S xf d d L)/* */ b = GG (b c d a x[ ] S x a edL)/* */ a = GG (a b c d x[ ] S xa e e L)/* */ d = GG (d a b c x[ ] S xfcefa f L)/* */ c = GG (c d a b x[ ] S x f d L)/* */ b = GG (b c d a x[ ] S x d a c aL)/* */
/* Round */ a = HH (a b c d x[ ] S xfffa L)/* */ d = HH (d a b c x[ ] S x f L)/* */ c = HH (c d a b x[ ] S x d d L)/* */ b = HH (b c d a x[ ] S xfde cL)/* */ a = HH (a b c d x[ ] S xa beea L)/* */ d = HH (d a b c x[ ] S x bdecfa L)/* */ c = HH (c d a b x[ ] S xf bb b L)/* */ b = HH (b c d a x[ ] S xbebfbc L)/* */ a = HH (a b c d x[ ] S x b ec L)/* */ d = HH (d a b c x[ ] S xeaa faL)/* */ c = HH (c d a b x[ ] S xd ef L)/* */ b = HH (b c d a x[ ] S x d L)/* */ a = HH (a b c d x[ ] S xd d d L)/* */ d = HH (d a b c x[ ] S xe db e L)/* */ c = HH (c d a b x[ ] S x fa cf L)/* */ b = HH (b c d a x[ ] S xc ac L)/* */
/* Round */ a = II (a b c d x[ ] S xf L)/* */ d = II (d a b c x[ ] S x aff L)/* */ c = II (c d a b x[ ] S xab a L)/* */ b = II (b c d a x[ ] S xfc a L)/* */ a = II (a b c d x[ ] S x b c L)/* */ d = II (d a b c x[ ] S x f ccc L)/* */ c = II (c d a b x[ ] S xffeff dL)/* */ b = II (b c d a x[ ] S x dd L)/* */ a = II (a b c d x[ ] S x fa e fL)/* */ d = II (d a b c x[ ] S xfe ce e L)/* */ c = II (c d a b x[ ] S xa L)/* */ b = II (b c d a x[ ] S x e a L)/* */ a = II (a b c d x[ ] S xf e L)/* */ d = II (d a b c x[ ] S xbd af L)/* */ c = II (c d a b x[ ] S x ad d bbL)/* */ b = II (b c d a x[ ] S xeb d L)/* */
state[ ] += a state[ ] += b state[ ] += c state[ ] += d
}
/*Encode把long数组按顺序拆成byte数组 因为java的long类型是 bit的 只拆低 bit 以适应原始C实现的用途 */ private void Encode (byte[] output long[] input int len) { int i j
for (i = j = j <leni++ j += ) { output[j] = (byte)(input[i] &xffL) output[j + ] = (byte)((input[i] >>>) &xffL) output[j + ] = (byte)((input[i] >>>) &xffL) output[j + ] = (byte)((input[i] >>>) &xffL) } }
/*Decode把byte数组按顺序合成成long数组 因为java的long类型是 bit的 只合成低 bit 高 bit清零 以适应原始C实现的用途 */ private void Decode (long[] output byte[] input int len) { int i j
for (i = j = j <leni++ j += ) output[i] = b iu(input[j]) | (b iu(input[j + ]) <<) | (b iu(input[j + ]) <<) | (b iu(input[j + ]) <<)
return }
/* b iu是我写的一个把byte按照不考虑正负号的原则的＂升位＂程序 因为java没有unsigned运算 */ public static long b iu(byte b) { return b <? b &x F + : b }
/*byteHEX() 用来把一个byte类型的数转换成十六进制的ASCII表示 因为java中的byte的toString无法实现这一点 我们又没有C语言中的 sprintf(outbuf "% X" ib) */ public static String byteHEX(byte ib) { char[] Digit = { A B C D E F } char [] ob = new char[ ] ob[ ] = Digit[(ib >>>) &X F] ob[ ] = Digit[ib &X F] String s = new String(ob) return s } /* public static void main(String args[]) {
MD m = new MD () System out println("我爱你 "+m getkeyBeanofStr("我爱你")) } */
lishixinzhi/Article/program/Java/JSP/201311/20523从代码看，你打开了两个记录集，但都为 rs.再真正写入news表时之前，却有set rs=nothing
.所以后面是不可能完成记录添加的。建议把过滤替换那段的代码中recordset，改为“rs1”:
'处理发表内容是脏话
set rs1=server.CreateObject("adodb.recordset")
sql="select * from site_info"
rs1.open sql,conn,3,3
if rs1.eof then
response.Write("OK，没有色情/反动信息!")
else
on error resume next
do while not rs1.bof and not rs1.eof
title=replace(title,rs1.fields("word").value,"**")
keywords=replace(keywords,rs1.fields("word").value,"**")
body=replace(body,rs1.fields("word").value,"**")
rs1.movenext
loop
end if
rs1.close
set rs1=nothing
''''''''''''''''''''''''''''''
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