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发信人: RichardQiu (Richard Qiu), 信区: Java
标 题: 用Java Servlet构建旗帜广告系统(2)
发信站: 荔园晨风BBS站 (Thu Oct 18 13:46:31 2001) , 转信
附录1、日志文件（log file)及格式
Banner 系统每天会自动产生两个日志文件。分别为ddmmyyyyv.txt和ddmmyyyyc.txt 。
第一个文件保存浏览banner的记录，第二个文件保存重定向的记录。两个文件都是文本文件
，每一行包括一条记录。纪录格式是：
IP地址 日期 图片文件 用户代理 重定向记录 (只用于 *c.txt文件) ,字段之间用空格
隔开。
附录2、Banner.java源程序：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Banner extends HttpServlet
{
public Banner(){ }
file://读取配置文件内容
private boolean readConfig(String sConfig, Hashtable hashtable)
{
try
{
BufferedReader bufferedreader = new BufferedReader(new InputStream
Reader(new FileInputStream(sConfig)));// 设置缓冲区读入一个配置文件
String sLineInformation1;//
while((sLineInformation1 = bufferedreader.readLine()) != null)
{
sLineInformation1 = sLineInformation1.trim();//去除字符串中的空
格
if(sLineInformation1.length() > 0)//如果字符串sLineInformation1
的
长度大于零 {
int i = sLineInformation1.indexOf("=");
if(i > 0 && i < sLineInformation1.length() - 1 && sLineInforma
tion1.charAt(0) != '#' && !sLineInformation1.startsWith("//"))//配置文件的每一行
参数必须以不为#或//开头的字符串
hashtable.put(sLineInformation1.substring(0, i).trim().toLow
erCase(), sLineInformation1.substring(i + 1).trim());
}
}
bufferedreader.close();
File file = new File(sConfig);//创建一个配置文件
hashtable.put("edited", String.valueOf(file.lastModified()));
}
catch(Exception _ex)
{
return false;
}
String sDirInfo2 = (String)hashtable.get("dir");//取得目录参数
if(sDirInfo2 != null)//如果目录参数是空值
{
if(!sDirInfo2.endsWith(separator))//如果sDirInfo2不是以分隔符结
尾
，那么
{
sDirInfo2 = sDirInfo2 + separator;//给sDirInfo2加上分隔符
hashtable.remove("dir");//移去哈希表变量中的dir
hashtable.put("dir", sDirInfo2);
}
File file1 = new File(sDirInfo2);
String as[] = file1.list();
if(as == null) {
hashtable.remove("dir");
}
sDirInfo2 = (String)hashtable.get("log");
if(sDirInfo2 != null)
{
if(!sDirInfo2.endsWith(separator))
{
sDirInfo2 = sDirInfo2 + separator;
hashtable.remove("log");
hashtable.put("log", sDirInfo2);
}
File file2 = new File(sDirInfo2);
String as1[] = file2.list();
if(as1 == null) {
hashtable.remove("log");
}
return true;
}
private Hashtable getConfig(String s)//取得配置
{
Hashtable hashtable = (Hashtable)cfgs.get(s);
if(hashtable != null)//如果配置不为空
try
{
String s1 = (String)hashtable.get("edited");
File file = new File(s);
if(!s1.equals(String.valueOf(file.lastModified()))){
file://如果s1的值不等于文件最后一次修改的值，则hashtable的内容为
空值
hashtable = null;
}
catch(Exception _ex)//捕获Exception _ex错误
{
hashtable = null;
}
if(hashtable != null)
return hashtable;
hashtable = new Hashtable();
if(!readConfig(s, hashtable))
{
return null;
}
else
{
cfgs.put(s, hashtable);
return hashtable;
}
}
public void init(ServletConfig servletconfig)//初始化配置参数
throws ServletException {
file://如果出错，抛出一个ServletException错误
super.init(servletconfig);
separator = System.getProperty("file.separator");//取得分隔符
cfgs = new Hashtable();//设置配置变量
logs = new Hashtable();//设置日志变量
System.out.println("© Wayne Zheng ");//屏幕输出我的邮箱地
址
}
public void destroy()
{
}
public void doPost(HttpServletRequest request, HttpServletResponse res
ponse)
file://发送POST请求
throws ServletException, IOException
{ doGet(request, response); }
public void doGet(HttpServletRequest httpservletrequest, HttpServlet
Response httpservletresponse) file://读取GET
throws ServletException, IOException
{
String strConfig = httpservletrequest.getQueryString();
file://读取请求字符串
if(strConfig == null)//如果字符串为空
strConfig = "";//那么设置strConfig为空
if(strConfig.length() == 0)
file://如果strConfig长度为零，那么显示错误信息
{
errorMessage("无配置信息！", httpservletresponse);
return;
}
String strConfig1 = getFromQuery(s, "config=");//同上
if(strConfig1.length() == 0){
strConfig1 = strConfig;
Hashtable hashtable = getConfig(strConfig1);
if(hashtable == null)
{
errorMessage("配置信息错误！", httpservletresponse);
return;
}
if(hashtable.get("dir") == null)
file://如果哈希表中dir为空值，则输出错误信息
{
errorMessage("不能打开数据目录", httpservletresponse);
return;
}
String strConfigMode2 = getFromQuery(strConfig, "mode=");//读取配
置
中的mode值
if(strConfigMode2.length() == 0){//如果没有mode值
strConfigMode2 = "1";//则设mode值为1
String strConfigId3 = getFromQuery(strConfig, "id=");//读取配置
中
的id值
if(strConfigId3.length() == 0){ file://如果没有id值
strConfigId3 = "1";//则设id值为1
HttpSession httpsession = httpservletrequest.getSession(true
);
if(strConfigMode2.equals("1"))
file://如果strConfigMode2的值为1，则显示banner广告
{
showBanner(hashtable, strConfigId3, httpsession, httpservl
etrequest, httpservletresponse);
return;
}
else file://否则转向banner所指的站点
{
goToSite(hashtable, strConfigId3, httpsession, httpservl
etrequest, httpservletresponse);
return;
}
}
private void goToSite(Hashtable hashtable, String s, HttpSession h
ttpsession, HttpServletRequest httpservletrequest, HttpServletResponse httpservl
etresponse)//转向站点
throws IOException file://如果有任何错误，抛出IOException错误
{
String sitename1;//定义站点名
if(httpsession == null)//如果httpsession为空
{
sitename1 = getFirstSite(hashtable);//站点名为哈希表中的第
一个站点名
}
else file://否则
{
Hashtable hashtable1 = (Hashtable)httpsession.getValue("旗
帜广告系统 ,Wayne Zheng");
if(hashtable1 == null){ file://如果哈希表hashtable1为空值，则
sitename1 = getFirstSite(hashtable);// 站点名为哈希表（hash
table）中的第一个站点名
else
sitename1 = (String)hashtable1.get(s);
}
if(sitename1 == null)
file://如果站点名为空值则站点名为默认值http://www.yesky.com
sitename1 = "http://www.yesky.com";
String s2;
if(hashtable.get("log") != null && (s2 = getFileByUrl(hashtable,
s1)) != null){
writeLog(hashtable, s2, sitename1, "c", httpservletrequest);
httpservletresponse.sendRedirect(sitename1);
}
private void showBanner(Hashtable hashtable, String s, HttpSession https
ession, HttpServletRequest httpservletrequest, HttpServletResponse httpservletre
sponse)
throws IOException
{
String s1 = (String)hashtable.get("dir");
File file = new File(s1);
Vector vector;
if(file == null)
{
vector = new Vector();
}
else
{
String as[] = file.list();
vector = getGraphFiles(as);
}
if(vector.size() == 0)
{
httpservletresponse.setContentType("text/html");
PrintWriter out = httpservletresponse.getWriter();
out.println("目录是空的！");
out.flush();
out.close();
return;
}
int i;
if(httpsession != null)
synchronized(hashtable.get("dir"))
{
Integer integer;
int j;
if((integer = (Integer)httpsession.getValue("bi")) == null){
j = 0;
else
j = integer.intValue();
if(j >= vector.size()) {
j = 0;
i = j;
if(++j >= 3){
j = 0;
httpsession.putValue("bi", new Integer(j));
}
else
i = 0;
String s2 = (String)vector.elementAt(i);
String s3;
if(httpsession != null && (s3 = getUrl(hashtable, s2)) !=
null)
{
Hashtable hashtable1;
if((hashtable1 = (Hashtable)httpsession.getValue("旗帜
广告系统 ,Wayne Zheng")) == null){
hashtable1 = new Hashtable();
hashtable1.put(s, s3);
httpsession.putValue("旗帜广告系统 ,Wayne Zheng", ha
shtable1);
}
if(hashtable.get("log") != null) {
writeLog(hashtable, s2, "v", httpservletrequest);
outputBanner(s2, hashtable, httpservletresponse);
vector = null;
}
private void writeLog(Hashtable logHashtable, String logString, String l
ogString1, String logString2, HttpServletRequest httpservletrequest)//写日志的函
数
{
String logString3 = (String)hashtable.get("log");
String logString4 = getLogString(logString, httpservletrequest) + " \"
" + logString1 + "\"";
GregorianCalendar gregoriancalendar = new GregorianCalendar();
file://获取当前的时间
gregoriancalendar.setTime(new Date());
String logString5 = logString3 + stringDate(gregoriancalendar) + logSt
ring2 + ".txt";//以时间戳和“c”或“v”为文件名来写日志文件
saveLog(hashtable, logString5, logString4);
}
private void writeLog(Hashtable logHashtable, String logString, String
logString1, HttpServletRequest httpservletrequest) file://写日志文件
{
String logString2 = (String)logHashtable.get("log");
String logString3 = getLogString(logString, httpservletrequest);
GregorianCalendar gregoriancalendar = new GregorianCalendar();
gregoriancalendar.setTime(new Date());
String logString4 = logString2 + stringDate(gregoriancalendar) + log
String1 + ".txt";
saveLog(logHashtable, logString4, logString3);
}
private void saveLog(Hashtable hashtable, String s, String s1)//把日志文
件保存在硬盘上
{
synchronized(hashtable.get("log"))
{
try
{
FileWriter filewriter = new FileWriter(s, true);
PrintWriter printwriter = new PrintWriter(filewriter);
printwriter.println(s1);
printwriter.flush();
printwriter.close();
filewriter.close();
}
catch(Exception _ex) { }
}
}
private String getLogString(String s, HttpServletRequest httpservletreques
t)
file://取得日志字符串
{
String s1 = httpservletrequest.getRemoteAddr();
file://取得远程的访问者的IP地址
String s2 = httpservletrequest.getHeader("User-Agent");
String s3 = httpservletrequest.getHeader("Referer");
String s4 = "\"" + s + "\"";
if(s1 == null)
s1 = "-";
if(s2 == null)
s2 = "-";
else
s2 = "\"" + s2 + "\"";
if(s3 == null)
s3 = "-";
else
s3 = "\"" + s3 + "\"";
return s1 + " [" + new Date() + "] " + s4 + " " + s3 + " " + s2;
}
private String stringDate(Calendar calendar) file://取得时间戳
{
String s = String.valueOf(calendar.get(1));
String s1 = String.valueOf(calendar.get(2));
if(s1.length() == 1)
s1 = "0" + s1;
s = s + s1;
s1 = String.valueOf(calendar.get(5));
if(s1.length() == 1)
s1 = "0" + s1;
return s + s1;
}
private String getFileByUrl(Hashtable hashtable, String s)
{
for(Enumeration enumeration = hashtable.keys(); enumeration.hasMoreE
lements();)
file://hashtable的keys()方法返回了哈希表关键字的枚举，enumeration
的
hasMoreElements()方法测试枚举重是否还有其他元素
{
String s1 = (String)enumeration.nextElement();
file://让s1的值为enumeration的下一个元素值
if(s.equals(hashtable.get(s1)))//如果s的值为s1的值，则
return s1;//返回s1的值
}
return null;
}
private String getFirstSite(Hashtable hashtable)//取得第一个站点的名字
{
String s = (String)hashtable.get("dir");
File file = new File(s);
if(file == null)
return null;
String as[] = file.list();
Vector vector = getGraphFiles(as);
file://设置Vector向量变量来获取图形文件
if(vector.size() == 0)//如果没有图形文件，则返回空值
return null;
else
return getUrl(hashtable, (String)vector.elementAt(0));
}
private String getUrl(Hashtable hashtable, String s)//取得URL
{
String s1 = s.toLowerCase();//设置s1为s的小写形式
for(Enumeration enumeration = hashtable.keys(); enumeration.hasMor
eElements();)
{
String s2 = (String)enumeration.nextElement();
if(s1.equals(s2.toLowerCase()))
return (String)hashtable.get(s2);
}
return null;
}
private void outputBanner(String s, Hashtable hashtable, HttpServletRespon
se httpservletresponse)//输出banner广告
throws IOException//如果有错则抛出IOException错误
{
String s1 = (String)hashtable.get("dir") + s;
httpservletresponse.setHeader("Cache-control", "no-store");
httpservletresponse.setHeader("Pragma", "no-cache");
httpservletresponse.setDateHeader("Expires", 1L);
httpservletresponse.setContentType("image/" + s.substring(s.indexOf(".
") + 1));
javax.servlet.ServletOutputStream servletoutputstream = httpservletres
ponse.getOutputStream();
dumpFile(s1, servletoutputstream);
servletoutputstream.flush();
servletoutputstream.close();
}
private boolean dumpFile(String s, OutputStream outputstream)
{
byte abyte0[] = new byte[4096];
boolean flag = true;
try
{
FileInputStream fileinputstream = new FileInputStream(s);
int i;
while((i = fileinputstream.read(abyte0)) != -1)
outputstream.write(abyte0, 0, i);
fileinputstream.close();
}
catch(Exception _ex)
{
flag = false;
}
return flag;
}
private Vector getGraphFiles(String as[])//获得图片文件
{
Vector vector = new Vector();
if(as == null)//如果as为空值，则返回vector中的值
return vector;
for(int i = 0; i < as.length; i++)//as.length为as[]数组长度
{
String s = as[i].toUpperCase();//设置图片文件文件名的每个字符
为
大写
if(isGraphFile(s))//如果为图片格式
vector.addElement(as[i]);//加入向量中
}
return vector;
}
private boolean isGraphFile(String stringFileName)
file://判断文件是否为图形格式
{
int i = stringFileName.indexOf(".");//
if(i <= 0 || i == stringFileName.length() - 1)
return false;
file://判断文件是否以GIF、JPG、JPEG或 PNG结尾
String stringExtendFileName1 = stringFileName.substring(i + 1);
return stringExtendFileName1.equals("GIF") || stringExtendFileName1.
equals("JPG") || stringExtendFileName1.equals("JPEG") || stringExtendFileName1.e
quals("PNG");
}
private void errorMessage(String s, HttpServletResponse httpservletrespo
nse)
throws IOException
{
httpservletresponse.setContentType("text/html");
PrintWriter out = httpservletresponse.getWriter();
out.println("");
out.println("");
out.println("");
out.println("");
out.println("");
out.println("
" + s + "
");
out.println("");
out.println("");
out.flush();
out.close();
}
private String getFromQuery(String strQuery, String strQuery1)
{
if(strQuery == null)
return "";
int i;
if((i = strQuery.indexOf(strQuery1)) < 0)
return "";
String strQuery2 = strQuery.substring(i + strQuery1.length());
if((i = strQuery2.indexOf("&")) < 0)
return strQuery2;
else
return strQuery2.substring(0, i);
}
public String getServletInfo()
{
return "旗帜广告系统 ,Wayne Zheng";
}
private static final String CPR = "© Wayne Zheng ";
private static final String DEFAULT_SITE = "www.yesky.com";
private static final String BANNER_SESSION = "旗帜广告系统 ,Wayne Zheng";
private static final String DIR = "dir";
private static final String LOG = "log";
private static final String BANNERINDEX = "bi";
private static final String EDITED = "edited";
private static final String VIEW_POSTFIX = "v";
private static final String CLICK_POSTFIX = "c";
private static final String CONFIG = "config";
private static final String MODE = "mode";
private static final String ID = "id";
private static final int BUFFER_SIZE = 4096;
static String separator = "/";
private static Hashtable cfgs;
private static Hashtable logs;
}
--
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