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import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CheckURLContentsServlet extends HttpServlet
{
public void init (ServletConfig config) throws ServletException
{
} // end init
private String escapeHtml (String str)
{
StringBuffer sb = new StringBuffer();
int j = str.length();
for (int i=0;i<j; i++)
{
char c = str.charAt(i);
switch (c)
{
case '<':
sb.append("<");
break;
case '>':
sb.append(">");
break;
case '&':
sb.append("&");
break;
default:
sb.append(c);
break;
}
}
return sb.toString();
} // end escapeHtml
private String insertLinks (String str, String url)
{
int i = 0;
StringBuffer sb = new StringBuffer();
while ((i=str.indexOf ("<",i))>=0)
{
int j = str.indexOf (">",i);
if (j<=i) { i++; continue; }
String str3 = str.substring (i+4, j);
String str2 = str3.toLowerCase();
if (!str2.startsWith("a")) { i++; continue; }
int k = j + 4;
j = str2.indexOf ("href");
if (j<0) { i++; continue; }
j = str2.indexOf ("=",j);
if (j<0) { i++; continue; }
str2 = str3.substring(j+1).trim();
j = str2.indexOf (" ");
if (j>=0)
str2 = str2.substring (0, j);
j = str2.indexOf ("<");
if (j>=0)
str2 = str2.substring (0, j);
if (!str2.startsWith("http://"))
{
int m = str2.length();
if (str2.startsWith("\'"))
str2 = str2.substring(1,m-1);
else if (str2.startsWith("\""))
str2 = str2.substring(1,m-1);
if (str2.startsWith("/"))
str2 = "\"" + url + str2 + "\"";
else
str2 = "\"" + url + "/" + str2 + "\"";
}
sb.append (str.substring(0,i));
sb.append ("</pre><a href=javascript:f("+str2+")>"+str.substring(i,k)+"</a><pre>");
str = str.substring (k);
i = 0;
}
sb.append (str);
return sb.toString();
} // end insertLinks
private String getURLContents (String urlAddress) throws Exception
{
URL url = new URL (urlAddress);
URLConnection uc = url.openConnection();
uc.setUseCaches (false);
uc.setDoInput(true);
InputStream is = uc.getInputStream();
InputStreamReader isr = new InputStreamReader (is);
BufferedReader br = new BufferedReader (isr);
StringBuffer sb = new StringBuffer();
String str;
for (int i=1;;i++)
{
str = uc.getHeaderFieldKey (i);
if (str==null)
break;
sb.append (escapeHtml(str+":"+uc.getHeaderField(str))+"<br>\r\n");
}
while ((str=br.readLine())!=null)
sb.append (escapeHtml(str)+"<br>\r\n");
return (sb.toString());
} // end getURLContents
public void service (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
{
String requestURI = req.getRequestURI();
String action = req.getParameter ("action");
String url = req.getParameter ("url");
if (action==null)
action = "noAction";
res.setContentType("text/html");
PrintWriter pw = res.getWriter();
pw.println ("<html>");
pw.println (" <head><title>CheckURLContentsServlet</title></head>");
pw.println (" <body>");
pw.println (" <center>");
pw.println (" <form name='f1' method='post' action='"+requestURI+"'><br>");
pw.println (" <table border='3'>");
pw.println (" <tr>");
pw.println (" <td>URL:</td>");
pw.println (" <td><input type='text' name='url' value='http://' cols='250' size='64'></td>");
pw.println (" </tr>");
pw.println (" </table>");
pw.println (" <input type='hidden' name='action' value='checkURLContents'>");
pw.println (" <input type='submit' value='Show URL Contents'>");
pw.println (" </form>");
pw.println (" </center>");
if (action.equals("checkURLContents"))
{
pw.println (" <center>");
pw.println (" <b>"+url+"</b><br>");
pw.println (" <a href='"+url+"' target='_blank'>Show Formatted</a><br>");
pw.println (" </center>");
pw.println (" <pre>");
try { pw.println (insertLinks(getURLContents(url),url)); }
catch (Exception e) { pw.println (e.toString()); }
pw.println (" </pre>");
}
pw.println (" </body>");
pw.println (" <script language='javascript'>");
pw.println (" function f (str)");
pw.println (" {");
pw.println (" document.f1.url.value = str;");
pw.println (" document.f1.submit();");
pw.println (" }");
pw.println (" </script>");
pw.println ("</html>");
pw.flush();
pw.close();
} // end service
} // end class CheckURLContentsServlet
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