用Java MySQL PHP轻松构建跨平台的搜索引

CREATE TABLE link (

Id int(10) unsigned NOT NULL auto_increment,

Url varchar(120) NOT NULL,

Class tinyint(3) unsigned NOT NULL default 0 ,

IsSearchLink tinyint(3) unsigned default 0,

PRIMARY KEY (Url),

UNIQUE Id (Id),

KEY Url (Url),

KEY Class (Class)

);

CREATE TABLE webpagelocal (

Id int(10) unsigned NOT NULL auto_increment,

Url varchar(120) NOT NULL,

Content text NOT NULL,

PRIMARY KEY (Url),

UNIQUE Id (Id),

KEY Url (Url)

);

　　# 数据表 webpagefindfast

　　# 用MakeFast.php从表webpagelocal中提取512字节的检索信息存放其中

CREATE TABLE webpagefindfast (

Id int(10) unsigned NOT NULL,

Url varchar(120) NOT NULL,

Title varchar(64),

Content blob,

PRIMARY KEY (Url),

KEY Url (Url),

KEY Title (Title)

);

/***************************** LinkToDB.java ***********************************

*

* 对URL中的http链接进行分析,将相对路径转换为绝对路径，排序方式输出结果到数据库

*

* 如果分析得到的URL是Link表中唯一的，就将其内容下载到表 WebPageLocal 中。

*

********************************************************************************

/

import java.io.*;

import java.util.*;

import java.net.*;

import java.lang.String;

import java.sql.*;

import java.text.*;

class Counter {

private int i = 1;

int read() { return i; }

void increment() { i  ; }

}

public class LinkToDB {

String UrlHost = "";

String UrlFile = "";

String UrlPath = "";

static String StartWith = null;

boolean outsideTag = true; //判断是否在标记之中

static char[] buffer = new char[4096]; // 缓冲区:用于保存从 URL 读的数据

InputStreamReader read = null;

BufferedReader reader = null;

URLConnection uc = null;

private URL url = null;

private StreamTokenizer st;

private TreeMap counts = new TreeMap();//以排序方式保存找到的链接

LinkToDB(String myurl,String StartOnly){

try {

StartWith = StartOnly;

if(StartOnly!=null) { if(!myurl.startsWith(StartOnly)) return; }//只搜索此网站

url = new URL(myurl);

UrlHost = url.getHost();

UrlHost = UrlHost.toUpperCase();

UrlFile = url.getFile();

int v=UrlFile.lastIndexOf("/");

if(v!=-1) UrlPath = UrlFile.substring(0,v);

System.out.println("分析文件：" myurl);

int uclength=200000;

int ucError=0;

try{

uc = url.openConnection();

uc.setUseCaches(false);

uc.connect();

}

catch(IOException io) { ucError=1; System.out.println("打不开待分析网页:" myu

rl); }

if(ucError!=1){

uclength = uc.getContentLength();

if (uclength＜200000) {

try{ read = new InputStreamReader(url.openStream()); }

catch(IOException io) {System.out.println("流打开错误:" myurl);}

}

else System.out.println("文件太大，不分析");

}

if(read!=null){

reader=new BufferedReader(read);

if(reader!=null){

st = new StreamTokenizer(reader);

st.resetSyntax(); // 重置语法表

st.wordChars(0,255); // 令牌范围为全部字符

st.ordinaryChar('＜'); // HTML标记两边的分割符

st.ordinaryChar('＞');

}

}

}

catch(MalformedURLException e){ System.out.println("Malformed URL String!");}

}

void cleanup() {

try { read.close(); }

catch(IOException e) { System.out.println("流关闭错误"); }

}

void countWords() {

try {

while(st.nextToken()!=StreamTokenizer.TT_EOF) {

String s0="";

String s_NoCase="";

switch(st.ttype) {

case '＜': //入标记字段

outsideTag=false;

continue; //countWords();

case '＞': //出标记字段

outsideTag=true;

continue; //countWords();

case StreamTokenizer.TT_EOL: s0 = new String("EOL"); break;

case StreamTokenizer.TT_WORD: if(!outsideTag) s0 = st.sval; /*已经是字符

串*/ break;

default: s0 = "";// s0 = String.valueOf((char)st.ttype);/*单一字符*/

}

if(outsideTag) continue;//出了标记区域(＜a ＞)

String s = "";

s_NoCase = s0.trim();

s0=s_NoCase.toUpperCase();

if(s0.startsWith("A ")||s0.startsWith("AREA ")||s0.startsWith("FRAME ")||s0.s

tartsWith("IFRAME ")){ //以这些开始的都是超级链接

int HREF_POS = -1;

if(s0.startsWith("FRAME ")||s0.startsWith("IFRAME ")) {

HREF_POS = s0.indexOf("SRC=");

s0 = s0.substring(HREF_POS 4).trim();

s_NoCase=s_NoCase.substring(HREF_POS 4).trim();

}

else {

HREF_POS=s0.indexOf("HREF=");

s0=s0.substring(HREF_POS 5).trim();

s_NoCase=s_NoCase.substring(HREF_POS 5).trim();

}

if(HREF_POS!=-1) {

if(s0.startsWith("/""))

{s0=s0.substring(1);s_NoCase=s_NoCase.substring(1);}

int QUOTE=s0.indexOf("/"");

if(QUOTE!=-1)

{s0=s0.substring(0,QUOTE).trim();s_NoCase=s_NoCase.substring(0,QUOTE).trim

();}

int SPACE=s0.indexOf(" ");

if(SPACE!=-1)

{s0=s0.substring(0,SPACE).trim();s_NoCase=s_NoCase.substring(0,SPACE).trim

();}

if(s0.endsWith("/""))

{s0=s0.substring(0,s0.length()-1);s_NoCase=s_NoCase.substring(0,s_NoCase.l

ength()-1);}

if(s0.indexOf("'")!=-1||s0.indexOf("JAVASCRIPT:")!=-1||s0.indexOf("..")!=-1

)

{s0="";s_NoCase="";} //有这些符号，认为非合法链接；两点表示上一目录，而我

只想向下级查找

if ( !s0.startsWith("FTP://") &&//以下后缀或前缀通常非网页格式

!s0.startsWith("FTP://") &&

!s0.startsWith("MAILTO:") &&

!s0.endsWith(".SWF") &&

!s0.startsWith("../")) //因../表示上一目录，通常只需考虑本级和下N级目录

s=s0;

if (!s.startsWith("HTTP://")&&!s.equals("")) {s=UrlHost UrlPath "/" s;s_No

Case=UrlHost UrlPath "/" s_NoCase;}

else if(s.startsWith("/")) {s=UrlHost s;s_NoCase=UrlHost s_NoCase;}

if(s.startsWith("HTTP://")) {s=s.substring(7);s_NoCase=s_NoCase.substring(

7);}

int JinHao=s.indexOf("#"); //如果含有"#"号，表示有效的链接是此前的部分

if(JinHao!=-1) {s=s.substring(0,JinHao).trim();s_NoCase=s_NoCase.substring(

0,JinHao).trim();}

int H=-1; //以下将/./转换为/

for(int m=0;m＜4;m  ){

H=s.indexOf("/./");

if(H!=-1) {s=s.substring(0,H) s.substring(H 2);s_NoCase=s_NoCase.substring

(0,H) s_NoCase.substring(H 2);}

}

int TwoXG=-1; //以下将//转换为/

for(int m=0;m＜5;m  ){

TwoXG=s.indexOf("//");

if(TwoXG!=-1) {s=s.substring(0,TwoXG) s.substring(TwoXG 1);s_NoCase=s_NoCa

se.substring(0,TwoXG) s_NoCase.substring(TwoXG 1);}

}

int OneXG=s.indexOf("/");

if(OneXG==-1) {s=s "/";s_NoCase ="/";} //将xx.xx.xx.xxx转换为xx.xx.xx.xxx/的

标准形式

if (!s.startsWith("HTTP://")) {s="HTTP://" s;s_NoCase="HTTP://" s_NoCase;}

}

}

if(counts.containsKey(s_NoCase)) ((Counter)counts.get(s_NoCase)).increment();

else counts.put(s_NoCase,new Counter());

}

} catch(IOException e) {

System.out.println("st.nextToken() unsuccessful");

}

}

Collection values() { return counts.values(); }

Set keySet() { return counts.keySet(); }

Counter getCounter(String s) { return (Counter)counts.get(s); }

public static void main(String[] argv) throws FileNotFoundException {

try{

Class.forName("org.gjt.mm.mysql.Driver").newInstance();

}

catch (Exception E) {

System.out.println("加载Jdbc驱动程序失败");

E.printStackTrace();

}

try{

Connection conn = DriverManager.getConnection(

"jdbc:mysql://localhost/Spider?user=root&password=mypassword");

Statement stmt = conn.createStatement();

String myurl;

for(int i=1;i＜=6;i  ){

String query = "SELECT Url FROM link WHERE IsSearchLink=0 and Class=" (i-1) "

ORDER BY Url";

ResultSet rs = stmt.executeQuery(query);

while (rs.next()) {

myurl = rs.getString("Url");

String StartOnly = null;

if(argv.length＞0) StartOnly=argv[0];

LinkToDB wc = new LinkToDB(myurl,StartOnly);

if(wc.reader!=null){

stmt.executeUpdate("UPDATE Link SET IsSearchLink=1 WHERE Class=" (i-1) " a

nd Url='" myurl "'");

wc.countWords();

Iterator keys = wc.keySet().iterator();

while(keys.hasNext()) {

String key = (String)keys.next();

System.out.println("分析找到链接：" key   ": "  wc.getCounter(key).read());

int ErrorDB=0;

if(StartWith==null||(StartWith!=null&&key.startsWith(StartWith))){

try{//-------------------------- 找到的链接插入数据库link -----------------

--

stmt.executeUpdate("INSERT INTO Link(Id,Url,Class) VALUES(0,'" key "',"

i ")");

}

catch(SQLException ex){

ErrorDB=1;

System.out.println("插入数据错 SQLException: "   ex.getMessage())

;

}

if(ErrorDB!=1){ //链接不重复就下载网页到WebPageLocal

System.out.println("下载网页:" key);

int length; // 读的字符数

int filelength=200000;

InputStreamReader read=null;

URL rurl=null;

URLConnection urlc=null;

String Content="";

try{ rurl = new URL(key); }

catch(MalformedURLException mu) {

System.out.println("打开下载网页出错:" mu.getMessage());

}

if(rurl!=null){

int ucError=0;

try{ urlc = rurl.openConnection(); urlc.connect();}

catch(IOException io) { ucError=1; System.out.println("下载网页打不开:" ke

y); }

if(ucError==0){

try{

filelength=urlc.getContentLength();

if (filelength＞=200000) System.out.println("网页太大，我不下载了。" key);

else read = new InputStreamReader(rurl.openStream());

}

catch(IOException io) {System.out.println("下载网页打不开:" key);}

}

// 读入 URL 并写入数据库

if(read!=null&&filelength＜200000){

try{

while((length = read.read(buffer)) != -1) {

String s = new String(buffer, 0, length);

Content=Content s;

}

}

catch(IOException io) {

Content="";

System.out.println("不能读入URL文件");

}

try{

Statement stmt2 = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, Res

ultSet.CONCUR_UPDATABLE);

ResultSet uprs = stmt2.executeQuery("SELECT Id,Url,Content FROM WebPageLoca

l WHERE 0");//WHERE 0很重要，否则会耗尽内存

uprs.moveToInsertRow();

uprs.updateInt("Id",0);

uprs.updateString("Url",key);

uprs.updateString("Content",Content);

uprs.insertRow();

uprs.beforeFirst();

uprs.close();

stmt2.close();

}

catch(SQLException ex){

System.out.println("插入数据错："   ex.getMessage());

}

}//if(read!=null&&filelength＜200000)

}//

}

}

//------------------------------- 下载网页 ----------------------------------

}//while(keys.hasNext())

wc.cleanup();

}//if(wc.reader!=null)

}//while rs.next

rs.close(); //关闭记录结果

}//end for

stmt.close(); //关闭语句

conn.close(); //关闭连接

}//try

catch(SQLException ex){ System.out.println("SQL异常:"   ex.getMessage()); }

}//main()函数结束

}//类 LinkToDB 结束

d:/Spider/＞ set CLASSPATH=d:/j/mm.mysql.jdbc2;

d:/Spider/＞ d:/j/bin/javac LinkToDB.java

d:/Spider/＞ d:/j/bin/java LinkToDB

＜?php

mysql_connect("localhost","root","mypassword");

$result = mysql_db_query("Spider","select Id,Url,Content from WebPageLocal whe

re Id＞$n1 and Id＜$n2");

while($mt = mysql_fetch_array($result)){

$Title = "";

$Body = "";

$mt2 = strtoupper($mt[2]);

$PosTitleL = strpos($mt2,"＜TITLE＞");

$PosTitleR = strpos($mt2,"＜/TITLE＞");

$PosBody = strpos($mt2,"＜BODY");

$PosHeadR = strpos($mt2,"＜/HEAD＞");

if($PosTitleL&&$PosTitleR) $Title = substr($mt[2],$PosTitleL 7,$PosTitl

eR-$PosTitleL-7);

$Title = eregi_replace("'","’",$Title);

if($PosBody) $Body = substr($mt[2],$PosBody);

else if($PosHeadR) $Body = substr($mt[2],$PosHeadR 7);

else if($PosTitleR) $Body = substr($mt[2],$PosTitleR 8);

else if($PosTitleL) $Body = substr($mt[2],$PosTitleL);

else $Body = $mt[2];

$BodyText = strip_tags($Body);

$BodyNoSpace = eregi_replace(" ","",$BodyText);

$BodyNoQuote = eregi_replace("'","",$BodyNoSpace);

$Body512 = substr($BodyNoQuote,0,511)." ";

$Id = $mt[0];

$Url = $mt[1];

$sql="Insert Into WebPageFindFast(Id,Url,Title,Content)

VALUES($Id,'$Url','$Title','$Body512')";

mysql_db_query("Spider",$sql) or die($sql);

echo $Id." ";

}

?＞

五、以上是建立搜索引擎所用到的数据，下面编制用于用户搜索的网页和PHP脚本文件。首先是用于搜索的表单页面SearchForm.htm，其内容如下。


＜html＞

＜head＞

＜title＞红蜘蛛搜索引擎-V0.1＜/title＞

＜meta http-equiv="Content-Type" content="text/html; charset=gb2312"＞

＜link rel="stylesheet" href="../All.css" type="text/css"＞

＜/head＞

＜body bgcolor="#eeffee" text="#000000"＞

＜table width="600" border="0" cellspacing="2" cellpadding="2" align="center" bgc

olor="#99CC00"＞

＜tr＞

＜td＞

＜div align="center"＞＜font color="#FF0000"＞＜b＞＜span class="pt16"＞红蜘蛛搜索

引擎＜/span＞

＜span class="pt12"＞V0.1＜/span＞＜/b＞＜/font＞＜/div＞

＜/td＞

＜/tr＞

＜/table＞

＜form name="form1" method="post" action="Search.php"＞

＜table width="600" border="1" cellspacing="1" cellpadding="1" align="center" b

ordercolor="#99CC00"＞

＜tr＞

＜td＞

＜div align="left"＞＜span class="pt15"＞＜font color="#FF0000"＞＜b＞关 键 字＜/

b＞：＜/font＞＜/span＞

＜input type="text" name="KeyWords" size="40" maxlength="40"＞

＜/div＞

＜/td＞

＜td＞

＜div align="left"＞＜span class="pt15"＞＜font color="#FF0000"＞＜b＞查找范围＜/

b＞：＜/font＞＜/span＞

＜select name="SearchIn"＞

＜option value="Content" selected＞网页正文＜/option＞

＜option value="Title"＞网页标题＜/option＞

＜/select＞

＜/div＞

＜/td＞

＜/tr＞

＜tr＞

＜td colspan="2"＞＜span class="pt15"＞＜font color="#FF0000"＞＜b＞查找方式＜/b＞：

＜/font＞＜/span＞

＜select name="Speed"＞

＜option value="Fast" selected＞快速查找＜/option＞

＜option value="Slow"＞更深查找＜/option＞

＜/select＞

＜/td＞

＜/tr＞

＜tr＞

＜td colspan="2"＞

＜div align="left"＞

＜input type="submit" name="Submit" value="搜索"＞

＜/div＞

＜/td＞

＜/tr＞

＜/table＞

＜/form＞

＜table width="600" border="0" cellspacing="2" cellpadding="2" align="center"＞

＜tr＞

＜td height="18"＞

＜p class="pt12"＞＜font color="#FF0000"＞＜b＞使用方法＜/b＞＜/font＞：仅需在关键字

一栏输入查询内容并按回车键（Enter)即可。

＜/p＞

＜blockquote＞

＜p align="left" class="pt12"＞如果希望输入多个条件，只需要用空格分隔即可：

＜/p＞

＜p class="pt12"＞例如：要查询同时包含“西昌”和“卫星”的网页，只需输入[西

昌 卫星]。＜/p＞

＜p class="pt12"＞又如：要查询只包含关键字“西昌”而不包含“卫星”的网页，

只需要输入[西昌 -卫星]。注意中间的空格不能少。＜/p＞

＜/blockquote＞

＜p class="pt12"＞＜font color="#FF0000"＞＜b＞查找范围＜/b＞＜/font＞：你可以选择从

“网页标题”中查找或者从“网页正文”中查找。＜/p＞

＜p class="pt12"＞＜font color="#FF0000"＞＜b＞查找方式＜/b＞＜/font＞：“快速查找”

速度快但找到的网页数可能较少，因为：＜/p＞

＜blockquote＞

＜p class="pt12"＞“快速查找”只搜索网页正文的前512个字符。＜/p＞

＜p class="pt12"＞“更深查找”搜索网页正文的前2048个字符。＜/p＞

＜div align="right"＞＜a href="mailto:zdyhlp@263.net"＞＜font color="#FF0000" class="pt13"＞＜b＞欢迎

提出宝贵意见＜/b＞＜/font＞＜/a＞＜/div＞

＜/blockquote＞

＜/td＞

＜/tr＞

＜/table＞

＜/body＞

＜/html＞

＜TITLE＞红蜘蛛正在搜索关键词为[＜?php echo $KeyWords?＞]的网页＜/TITLE＞

＜link rel="stylesheet" href="../All.css" type="text/css"＞

＜body bgcolor="#eeffee"＞

＜table width="96%" border="0" cellspacing="2" cellpadding="2" align="center" bgc

olor="#99CC00"＞

＜tr＞

＜td＞

＜div align="center"＞＜font color="#FF0000"＞＜b＞＜span class="pt16"＞红蜘蛛搜索

引擎＜/span＞

＜span class="pt12"＞V0.1＜/span＞＜/b＞＜/font＞＜/div＞

＜/td＞

＜/tr＞

＜/table＞

＜form name="form1" method="post" action="Search.php"＞

＜table width="96%" border="1" cellspacing="1" cellpadding="1" align="center" b

ordercolor="#99CC00"＞

＜tr＞

＜td valign="top"＞ ＜font color="#FF0000"＞＜b＞＜span class="pt13"＞关键字＜/span

＞＜/b＞＜span class="pt13"＞：＜/span＞＜/font＞

＜input type="text" name="KeyWords" value="＜?php echo $KeyWords?＞" size="

30" maxlength="30"＞

＜input type="submit" name="Submit" value="重新搜索"＞

＜/td＞

＜td valign="top"＞＜font color="#FF0000"＞＜b＞＜span class="pt13"＞查找范围＜/spa

n＞＜/b＞＜span class="pt13"＞：＜/span＞＜/font＞

＜select name="SearchIn"＞

＜option value="Content" ＜?php if ($SearchIn=="Content") echo "selected

";?＞＞网页正文＜/option＞

＜option value="Title" ＜?php if ($SearchIn=="Title") echo "selected

";?＞＞网页标题＜/option＞

＜/select＞

＜/td＞

＜td valign="top"＞

＜div align="left"＞＜font color="#FF0000"＞＜b＞＜span class="pt13"＞查找方式＜/

span＞＜/b＞＜span class="pt13"＞：＜/span＞＜/font＞

＜select name="Speed"＞

＜option value="Fast" ＜?php if ($Speed=="Fast") echo "selected";?＞＞快

速查找＜/option＞

＜option value="Slow" ＜?php if ($Speed=="Slow") echo "selected";?＞＞更

深查找＜/option＞

＜/select＞

＜/div＞

＜/td＞

＜/tr＞

＜/table＞

＜/form＞

＜?php

if($SearchIn=="Title") $SQL="SELECT Id,Url,Title,Content FROM WebPageFindFast

WHERE ";

else $SQL="SELECT Id,Url,Title,Content FROM WebPageFind$Speed WHERE ";

$KeyWords=str_replace("　", " ", $KeyWords);

if($KeyWords=="") {echo "关键字不能为空"; exit();}

$tok = strtok($KeyWords," ");

$i=0;

$j=0;

while($tok) {

$i  ;

$tok = strtok(" ");

}

$key = strtok($KeyWords," ");

while($key) {

$j  ;

if(substr($key,0,1)!="-") {

$SQL=$SQL.$SearchIn." LIKE '%".$key."%' ";

$Words[]=$key;

}

else {

$SQL=$SQL.$SearchIn." NOT LIKE '%".substr($key,1)."%' ";

}

if($j＜$i) $SQL.=" AND ";

$key = strtok(" ");

}

if($CurPos!="") $SQL.=" AND Id＞=$CurPos ";

$SQL.=" LIMIT 100";

//echo "/$SQL=".$SQL."＜br＞";

mysql_connect("localhost","root","mypassword");

$result=mysql_db_query("Spider",$SQL);

$RowCount=mysql_num_rows($result);

$FindCount=0;

?＞

＜table border=0 align=center width="96%"＞

＜tr＞

＜th nowrap width="41%"＞

＜div align="left" class="pt12"＞共找到关键字为 ＜font color=red＞

＜?php echo $KeyWords?＞

＜/font＞ 的网页共 ＜font color=red＞

＜?php echo $RowCount;?＞

＜/font＞ 个＜/div＞

＜/th＞

＜td nowrap＞

＜/td＞

＜/tr＞

＜tr bgcolor="#FF0000"＞

＜th nowrap colspan="2" height="3"＞＜/th＞

＜/tr＞

＜?php while($row= mysql_fetch_array($result)){

$Pos=$row[0];

$FindCount  ;

if($FindCount＞20) break;?＞

＜tr＞

＜td nowrap colspan="2"＞

＜?php echo $FindCount;?＞

＜a href="＜?php echo $row[1]?＞" target=_black＞

＜?php if($row[2]!="") echo $row[2];

else echo substr($row[3],0,64);

?＞

＜/a＞＜/td＞

＜/tr＞

＜tr＞

＜td colspan="2" ＞＜span class="pt13"＞摘要：＜/span＞

＜?php

if($SearchIn=="Title") {

$ZhaiYao=substr($row[3],0,1024);

}

else{

if($Speed=="Fast") $ZhaiYao=$row[3];

else{

$RowLen=strlen($row[3]);

if ($RowLen＜1024) {

$ZhaiYao=$row[3];

}

else {

$CutPos=0;

$PosWord1=strpos($row[3],$Words[0]);

if($PosWord1-512＜0) $ZhaiYao=substr($row[3],0,1024);

else {

for($i=24;$i＜500;$i  ){ //避免将中文字符从半个字处截断，选择从英文处截断

if(ord(substr($row[3],$PosWord1-$i,1))＜128) {$CutPos=$i;break;}

}

$ZhaiYao=substr($row[3],$PosWord1-$CutPos,1024);

}

}

}

for($i=0;$i＜count($Words);$i  ){

$ZhaiYao=str_replace($Words[$i],"＜font color=red＞".$Words[$i]."＜/font＞", $ZhaiY

ao);

}

}

echo $ZhaiYao;

?＞

＜/td＞

＜/tr＞

＜tr＞

＜td colspan="2" align="right"＞＜a href="One.php?num=＜?php echo $row[0]?＞" tar

get=_black＞

＜font color="#0033FF" class="pt12"＞本地镜像＜/font＞＜/a＞＜/td＞

＜/tr＞

＜tr bgcolor="#999933"＞

＜td nowrap colspan="2" height="1"＞＜/td＞

＜/tr＞

＜?php } ?＞

＜?php if($RowCount＞20){ ?＞

＜tr＞

＜td align="right" colspan="2" height="10"＞

＜form name="form2" method="post" action="Search.php"＞

＜input type="hidden" name="KeyWords" value="＜?php echo $KeyWords;?＞"＞

＜input type="hidden" name="SearchIn" value="＜?php echo $SearchIn;?＞"＞

＜input type="hidden" name="Speed" value="＜?php echo $Speed;?＞"＞

＜input type="hidden" name="CurPos" value="＜?php echo $Pos;?＞"＞

＜input type="submit" name="Submit" value="下20个网页"＞

＜/form＞

＜/td＞

＜/tr＞

＜?php } ?＞

＜/table＞

＜?php

　mysql_connect("localhost","root","mypassword");

　$sql="select Url,Content from WebPageLocal where ";

　if($num!="") $sql=$sql."Id=$num";

　else exit();

　$result=mysql_db_query("Spider",$sql);

　$mt=mysql_fetch_row($result);

　echo $mt[1];

?＞