http.java

一个经典的java的web服务器的建立源代码

// $Id: HTTP.java,v 1.10 2001/01/25 02:17:09 nconway Exp $
package tornado;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

public final class HTTP {
    private static SimpleDateFormat dateMaker =
                new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z");
    private static TimeZone gmt = TimeZone.getTimeZone("GMT");

    public static int CONTINUE = 100;
    public static int OK = 200;
    public static int CREATED = 201;
    public static int ACCEPTED = 202;
    public static int NO_CONTENT = 204;
    public static int RESET_CONTENT = 205;
    public static int PARTIAL_CONTENT = 206;
    public static int MULTIPLE_CHOICES = 300;
    public static int MOVED = 301;
    public static int FOUND = 302;
    public static int SEE_OTHER = 303;
    public static int NOT_MODIFIED = 304;
    public static int USE_PROXY = 305;
    public static int TEMP_REDIRECT = 306;
    public static int BAD_REQUEST = 400;
    public static int UNAUTH = 401;
    public static int FORBIDDEN = 403;
    public static int NOT_FOUND = 404;
    public static int METHOD_NOT_ALLOWED = 405;
    public static int NOT_ACCEPTABLE = 406;
    public static int TIMEOUT = 408;
    public static int CONFLICT = 409;
    public static int GONE = 410;
    public static int LENGTH_REQUIRED = 411;
    public static int PRECONDITION_FAILED = 412;
    public static int REQUEST_TOO_LARGE = 413;
    public static int URI_TOO_LONG = 414;
    public static int BAD_MEDIA_TYPE = 415;
    public static int EXPECTATION_FAILED = 417;
    public static int SERVER_ERROR = 500;
    public static int NOT_IMPLEMENTED = 501;
    public static int UNAVAILABLE = 503;
    public static int BAD_HTTP_VERSION = 505;

    public static String STATUS_100 = "Continue";
    public static String STATUS_200 = "OK";
    public static String STATUS_201 = "Created";
    public static String STATUS_202 = "Accepted";
    public static String STATUS_203 = "No Content";
    public static String STATUS_204 = "Reset Content";
    public static String STATUS_206 = "Partial Content";
    public static String STATUS_300 = "Multiple Choices";
    public static String STATUS_301 = "Moved";
    public static String STATUS_302 = "Found";
    public static String STATUS_303 = "See Other";
    public static String STATUS_304 = "Not Modified";
    public static String STATUS_305 = "Use Proxy";
    public static String STATUS_306 = "Temporary Redirect";
    public static String STATUS_400 = "Bad Request";
    public static String STATUS_401 = "Unauthorized";
    public static String STATUS_403 = "Forbidden";
    public static String STATUS_404 = "Not Found";
    public static String STATUS_405 = "Method Not Allowed";
    public static String STATUS_406 = "Not Acceptable";
    public static String STATUS_408 = "Request Timeout";
    public static String STATUS_409 = "Conflict";
    public static String STATUS_410 = "Gone";
    public static String STATUS_411 = "Length Required";
    public static String STATUS_412 = "Precondition Failed";
    public static String STATUS_413 = "Request Entity Too Large";
    public static String STATUS_414 = "Request-URI Too Long";
    public static String STATUS_415 = "Unsupported Media Type";
    public static String STATUS_417 = "Expectation Failed";
    public static String STATUS_500 = "Internal Server Error";
    public static String STATUS_501 = "Not Implemented";
    public static String STATUS_503 = "Unavailable";
    public static String STATUS_505 = "HTTP Version Not Supported";

    /** Returns the <code>String</code> form of the specified statusCode.
      * In order to do this, it uses reflection to return the value
      * of one the appropriate STATUS_xxx constants.
      */
    public static String getStatusStr(int statusCode) {
        String fieldName = "STATUS_" + statusCode;
        try {
            String statusStr = (String)Class.forName("tornado.HTTP")
                                     .getField(fieldName)
                                     .get(null);
            return statusStr;
        } catch (NoSuchFieldException e) {
            throw new IllegalArgumentException("Invalid status code: " +
                                                statusCode);
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
    }

    public static String formatDate(Date date) {
        // bad, don't call this every time
        dateMaker.setTimeZone(gmt);
        return dateMaker.format(date);
    }
}