com.sun.enterprise.web.connector.grizzly.HtmlHelper Maven / Gradle / Ivy
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package com.sun.enterprise.web.connector.grizzly;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.util.Date;
/**
* Utility class used to generate HTML pages.
*
* @author Jean-Francois Arcand
*/
public class HtmlHelper{
private final static String CSS =
"H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} " +
"H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} " +
"H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} " +
"BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} " +
"B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} " +
"P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}" +
"A {color : black;}" +
"HR {color : #525D76;}";
/**
* CharBuffer used to store the HTML response, containing
* the headers and the body of the response.
*/
private static CharBuffer reponseBuffer = CharBuffer.allocate(4096);
/**
* Encoder used to encode the HTML response
*/
private static CharsetEncoder encoder =
Charset.forName("UTF-8").newEncoder();
/**
* HTTP end line.
*/
private static String NEWLINE = "\r\n";
/**
* HTTP OK header
*/
public final static String OK = "HTTP/1.1 200 OK" + NEWLINE;
/**
* HTTP Bas Request
*/
public final static String BAD_REQUEST
= "HTTP/1.1 400 Bad Request" + NEWLINE;
/**
* When Grizzlu has reached its connection-queue pool limits, an HTML
* error pages will to be returned to the clients.
*
* @return A ByteBuffer containings the HTTP response.
*/
public synchronized static ByteBuffer
getErrorPage(String message, String code) throws IOException {
String body = prepareBody(message);
reponseBuffer.clear();
reponseBuffer.put(code);
appendHeaderValue("Content-Type", "text/html");
appendHeaderValue("Content-Length", body.getBytes().length + "");
appendHeaderValue("Date", new Date().toString());
appendHeaderValue("Connection", "Close");
appendHeaderValue("Server", SelectorThread.SERVER_NAME);
reponseBuffer.put(NEWLINE);
reponseBuffer.put(body);
reponseBuffer.flip();
return encoder.encode(reponseBuffer);
}
/**
* Utility to add headers to the HTTP response.
*/
private static void appendHeaderValue(String name, String value) {
reponseBuffer.put(name);
reponseBuffer.put(": ");
reponseBuffer.put(value);
reponseBuffer.put(NEWLINE);
}
/**
* Prepare the HTTP body containing the error messages.
*/
private static String prepareBody(String message){
StringBuffer sb = new StringBuffer();
sb.append("");
sb.append(SelectorThread.SERVER_NAME);
sb.append(" ");
sb.append(" ");
sb.append("");
sb.append("");
sb.append(message);
sb.append("
");
sb.append("
");
sb.append("").append(SelectorThread.SERVER_NAME)
.append("
");
sb.append("");
return sb.toString();
}
}