| | | WAP手机上的问卷调查系统的构建 | | 2001-04-12·
·wayne··yesky
| 上一页 1 2
配置文件实例：
#
# vote config file
#
log=c:\catalina\logs\votelog.txt
after=c:\catalina\webapps\examples\servlet\vote.html
options=搜狐,新浪,网易
column=0
title=您喜欢哪一个门户网站
cookies=1
bgcolor=#FFFFFF
fgcolor=#000000
size=2
face=Verdana,Arial
votecolor=#FF0000
现在让我们来看一看源程序吧：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class WapVoteServlet extends HttpServlet
{
public WapVoteServlet()
{
}
private static final String CONFIG = "config";
private static final String ACTION = "act";
private static final String VOTE = "vote";
private static final String LOG = "log";
private static final String AFTER = "after";
private static final String VIEW = "view";
private static final String COOKIES = "cookies";
private static final String BGCOLOR = "bgcolor";
private static final String FGCOLOR = "fgcolor";
private static final String SIZE = "size";
private static final String FACE = "face";
private static final String TITLE = "title";
private static final String COLUMN = "column";
private static final String VOTECOLOR = "votecolor";
private static final String DEFBGCOLOR = "#FFFFFF";
private static final String DEFFGCOLOR = "#000000";
private static final String DEFVOTECOLOR = "#FF0000";
private static final String DEFCOOKIES = "0";
private static final String DEFCOLUMN = "1";
private static final String DEFTITLE = "A Free & Simple Vote System";
private static final String OPTIONS = "options";
private static final String EDITED = "edited";
private static final String FICT = "fct";
private static final String WAPVOTE = "wpv";
private static final int MAX_WML = 900;
private static final int MAX_VOTES = 20;
private static String NEWLINE = "\n";
private static Hashtable cfgs;
private static Hashtable forLock;
public void init(ServletConfig config)
throws ServletException
{
super.init(config);
NEWLINE = System.getProperty("line.separator");
cfgs = new Hashtable();
forLock = new Hashtable();
}
file://由于使用POST发送表单，所以现用doPost来处理POST请求
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
doGet(request, response); file://调用doGet去处理POST请求
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
file://用于处理GET请求
throws ServletException, IOException
{
String s = "";
String s1 = "";
s = HttpUtils.getRequestURL(request).toString();//把收到的请求转化成字符串
int i;
if((i = s.indexOf("?")) > 0) file://想一想为什么要这么写？
s = s.substring(0, i);
s1 = request.getQueryString(); file://取的请求的字符串
if(s1 == null)//如果为空，既是没有写上配置文件名，故要发出错误信息
{
errorMessage("不能读到配置文件", null, request, response);
return;
}
String s2 = getFromQuery(s1, "config=");//读取请求中"&"后的字符串
if(s2.length() == 0)
s2 = s1;
String s3 = getFromQuery(s1, "act=");
Hashtable hashtable = getConfig(s2);//读取配置文件
if(hashtable.get("log") == null)//如果配置文件中没有log参数，则出现错误信息
{
errorMessage("不能从你的配置文件中发现日志文件名！", hashtable, request, response);
return;
}
if(s3.length() == 0) file://s3为act后的字符串
s3 = "vote";
if(((String)hashtable.get("cookies")).equals("1") && s3.equals("vote"))
{
Cookie acookie[] = request.getCookies(); file://设立cookie是为了防止用户多次投票
file://下面的循环是为了能找出你是否已经投过票
if(acookie != null)
{
for(int j = 0; j < acookie.length; j++)
{
Cookie cookie = acookie[j];
if(s2.equals(cookie.getName()))
{
errorMessage("你的投票被取消了", hashtable, request, response);
return;
}
}
}
Cookie cookie1 = new Cookie(s2, "yes");
cookie1.setMaxAge(0x15180);
response.addCookie(cookie1);
}
if(s3.equals("vote"))
{
takeVote(s, s2, hashtable, request, response);
return;
}
if(s3.equals("log"))
{
showLog(s, hashtable, request, response);
return;
}
if(hashtable.get("options") == null)
{
errorMessage("不能读入你的配置值", hashtable, request, response);
return;
}
else
{
showVote(s, s2, hashtable, request, response);
return;
}
}
private void readConfig(String s, Hashtable hashtable) file://读取配置文件
{
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(s)));
String s1;
while((s1 = reader.readLine()) != null) file://从配置文件中读入一行参数字符串
{
s1 = s1.trim(); file://移去s1中的空格
if(s1.length() > 0)
{
int i = s1.indexOf("=");//在s1中寻找“=”，i为被=分成的段数
if(i > 0 && i < s1.length() - 1 && s1.charAt(0) != '#' && !s1.startsWith("//"))
file://参数的第一个字符不能为#和//
hashtable.put(s1.substring(0, i).trim(), s1.substring(i + 1).trim());
file://把等号前后的字符串分别存入哈西表中
}
}
reader.close();
File file = new File(s);
hashtable.put("edited", String.valueOf(file.lastModified()));
}
catch(Exception _ex) { }
if(hashtable.get("bgcolor") == null)
hashtable.put("bgcolor", "#FFFFFF"); file://向哈西表中写入默认的背景色
if(hashtable.get("fgcolor") == null)
hashtable.put("fgcolor", "#000000"); file://向哈西表中写入默认的前景色
if(hashtable.get("column") == null)
hashtable.put("column", "1"); file://向哈西表中写入默认的column值
if(hashtable.get("cookies") == null)
hashtable.put("cookies", "0"); file://向哈西表中写入默认的cookies值为0
if(hashtable.get("title") == null)
hashtable.put("title", "A Free & Simple Vote System");
file://向哈西表中写入默认的标题
if(hashtable.get("votecolor") == null)
hashtable.put("votecolor", "#FF0000"); file://向哈西表中写入默认投票色
hashtable.put("fct", new Integer(0));
}
private Hashtable getConfig(String s) file://打开配置文件
{
Hashtable hashtable;
if((hashtable = (Hashtable)cfgs.get(s)) != null)
{
File file = new File(s);
String s1 = (String)hashtable.get("edited");
if(s1.equals(String.valueOf(file.lastModified())))
return hashtable; file://如果文件被编辑过，则返回哈西表
cfgs.remove(s);
hashtable = null;
}
hashtable = new Hashtable();
readConfig(s, hashtable);
cfgs.put(s, hashtable);
String s2 = (String)hashtable.get("log");
if(s2 != null && forLock.get(s2) == null)
forLock.put(s2, new Object());
return hashtable;
}
private void showVote(String s, String s1, Hashtable hashtable, HttpServletRequest request, HttpServletResponse response)
throws IOException
{
String s2 = (String)hashtable.get("options");
String s3 = (String)hashtable.get("column");
String s4 = (String)hashtable.get("title");
String s6 = getFont(hashtable);
String s7 = "";
String s8 = "";
if(request.getHeader("Accept").indexOf("wap.wml") >= 0)
PrintWriter ＯＵＴ;
response.setContentType("text/vnd.wap.wml");
ＯＵＴ = response.getWriter();
ＯＵＴ.println("＜?xml version=\"1.0\"?＞");
ＯＵＴ.println("＜!DOCTYPE wml PUBLIC \"-//WAPFORUM//DTD WML 1.1//EN\" \"http://www.wapforum.org/DTD/wml_1.1.xml\"＞");
ＯＵＴ.println("＜wml＞");
ＯＵＴ.println("＜CARD id='\"showvote\"' title='\""' ?\? + (String)hashtable.get(?title?)＞");
ＯＵＴ.println("＜DO label='\"Vote\"' type='\"accept\"'＞");
ＯＵＴ.println("＜GO ?\? + method='\"post\"' vote? ?=" + s1 + " ?act? &? ?config? ??? s href='\""'＞");
ＯＵＴ.println("＜POSTFIELD value='\"$(sVote)\"/' name='\"wpv\"'＞");
ＯＵＴ.println("＜/GO＞");
ＯＵＴ.println("＜/DO＞");
ＯＵＴ.println("＜P mode='\"nowrap\"'＞＜B＞" + s4 + "＜/B＞＜/P＞");
ＯＵＴ.println(" ＜P mode='\"nowrap\"'＞");
ＯＵＴ.println("＜SELECT name='\"sVote\"'＞");
StringTokenizer str = new StringTokenizer(s2, ",");
while(str.hasMoreTokens())
{
String s5 = str.nextToken();
ＯＵＴ.println("＜OPTION selected value='\""' ?\? + s5>" + s5 + "＜/OPTION＞"); }
ＯＵＴ.println("＜/SELECT＞");
ＯＵＴ.println("＜/P＞");
ＯＵＴ.println("＜/CARD＞");
ＯＵＴ.println("＜/WML＞");
ＯＵＴ.flush();
ＯＵＴ.close();
}
private void takeVote(String s, String s1, Hashtable hashtable, HttpServletRequest request, HttpServletResponse response)
throws IOException
{
String s2 = (String)hashtable.get("log");
String s3 = (String)hashtable.get("after");
String s6 = "";
Enumeration enumeration = request.getParameterNames();
if(request.getHeader("Accept").indexOf("wap.wml") >= 0)
file://判断是否为WAP设备接收
{
s6 = request.getParameter("wpv");
if(s6 == null)
s6 = "";
}
if(s6.length() > 0)
writeLog(hashtable, request, s6, s2);
if(s3 == null) file://如果s3为空，则显示日志文件
{
showLog(s, hashtable, request, response);
return;
}
else file://否则发送重定向
{
String s4 = s + "?" + "config" + "=" + s1 + "&" + "act" + "=" + "log";
response.sendRedirect(s4);
return;
}
}
private void writeLog(Hashtable hashtable, HttpServletRequest request, String s, String s1)//写日志文件
{
String s2 = request.getRemoteAddr(); file://取得客户机的IP地址
try {
synchronized(forLock.get(s1))
file://注意：使用synchronized关键字，说明同一时间只能有一个写动作，其余的要在队列中等待
{
int i = ((Integer)hashtable.get("fct")).intValue();
file://取得日志文件的fct值
if(i >= 20)
{
return;
}
hashtable.put("fct", new Integer(i + 1));//把fct值加1放回哈希表
FileWriter filewriter = new FileWriter(s1, true);
PrintWriter ＯＵＴ = new PrintWriter(filewriter);
ＯＵＴ.println((s2 != null ? s2 : "未知地址") + "," + new Date() + "," + s);
ＯＵＴ.flush();
ＯＵＴ.close();
}
return;
}
catch(IOException _ex)
{
return;
}
}
private void errorMessage(String s, Hashtable hashtable, HttpServletRequest request, HttpServletResponse response)//输出错误信息
throws IOException
{
PrintWriter ＯＵＴ = null;
response.setContentType("text/vnd.wap.wml");//设置为WML文件格式
ＯＵＴ = response.getWriter();
ＯＵＴ.println("");
ＯＵＴ.println("");
ＯＵＴ.println("＜WML＞");
ＯＵＴ.println("");
ＯＵＴ.println(" " + s + "");
ＯＵＴ.println("");
ＯＵＴ.println("");
ＯＵＴ.flush();
ＯＵＴ.close();
}
private void showLog(String s, Hashtable hashtable, HttpServletRequest request, HttpServletResponse response)
throws IOException
{
String s1 = (String)hashtable.get("log");
String s2 = getFont(hashtable);
Vector vector = new Vector();
Hashtable hashtable1 = new Hashtable();
StringBuffer stringbuffer = new StringBuffer("");
long l = 0L;
String s7 = (String)hashtable.get("title");
try {
synchronized(forLock.get(s1))
{
BufferedReader bufferedreader = new BufferedReader(new putStreamReader(new FileInputStream(s1)));
String s3;
while((s3 = bufferedreader.readLine()) != null) file://读入一条参数
vector.addElement(s3); file://作为一个元素加入向量中
bufferedreader.close();
}
}
catch(Exception _ex) { }
if(request.getHeader("Accept").indexOf("wap.wml") >= 0)
for(int j = 0; j < vector.size(); j++)
{
String s4 = (String)vector.elementAt(j); file://取得向量中第j+1个元素
int i = s4.indexOf(","); file://i表示s4被逗号“，”分隔开的段数
if(i > 0 && i != s4.length() - 1)
s4 = s4.substring(i + 1);
i = s4.indexOf(",");
if(i > 0 && i != s4.length() - 1)
s4 = s4.substring(i + 1);
Long long1;
if((long1 = (Long)hashtable1.get(s4)) == null)
{
hashtable1.put(s4, new Long(1L));
}
else
{
hashtable1.remove(s4);
hashtable1.put(s4, new Long(long1.longValue() + 1L));
}
l++;
}
vector = null;
PrintWriter ＯＵＴ;
response.setContentType("text/vnd.wap.wml");
ＯＵＴ = response.getWriter();
ＯＵＴ.println("");
ＯＵＴ.println("");
ＯＵＴ.println("");
ＯＵＴ.println("＜CARD id='\"voteres\"' title='\""' ?\? + (String)hashtable.get(?title?)＞ ＜P＞");
if(hashtable1.size() == 0)
ＯＵＴ.println(" 我们现在还未收到任何投票");
else
{
ＯＵＴ.println(" " + s7 + "");
while(hashtable1.size() > 0)
{
Enumeration enumeration = hashtable1.keys();
long l1 = 0L;
String s6 = null;
while(enumeration.hasMoreElements())
{
String s5 = (String)enumeration.nextElement();
long l2 = ((Long)hashtable1.get(s5)).longValue();
if(l2 > l1)
{
s6 = s5;
l1 = l2;
}
}
hashtable1.remove(s6);
stringbuffer.append(" " + s6 + "" + NEWLINE);
stringbuffer.append(" " + l1 + " (" + formatValue((float)((100D * (double)(float)l1) / (double)(float)l)) + "%)" + NEWLINE);
if(stringbuffer.length() > 900){
break;
}
ＯＵＴ.println(stringbuffer.toString());
}
ＯＵＴ.println("");
ＯＵＴ.println("");
hashtable1 = null;
ＯＵＴ.flush();
ＯＵＴ.close();
}
private String getFont(Hashtable hashtable)
{
String s1 = "
String s;
if((s = (String)hashtable.get("face")) != null){
s1 = s1 + " face=\"" + s + "\"";
if((s = (String)hashtable.get("size")) != null){
s1 = s1 + " size=\"" + s + "\"";
return s1 + ">";
}
private String getFromQuery(String s, String s1) file://从s中找出s1
{
if(s == null)
return "";//如果s为空，当然返回“”
int i;
if((i = s.indexOf(s1)) < 0)//如果s中找不到s1，也返回空值
return "";
String s2 = s.substring(i + s1.length());
file://把s1所表示字符串后的值赋予s2，Config=conf_file&act=vote
if((i = s2.indexOf("&")) < 0) file://如果s2中没有&，则返回s2的值
return s2;
else
return s2.substring(0, i); file://否则返回&后的字符串
}
private String formatValue(float f)
{
String s = String.valueOf(f);
int i = s.indexOf(".");
if(i > 0 && i + 4 < s.length() && s.indexOf("e") < 0 && s.indexOf("E") < 0){
s = s.substring(0, i + 4);
return s;
}}＜/SELECT＞
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