httpstatus.java

RFC 1945 Http1.0协议实现。对协议进行了完整面向对象设计

/**
 * 
 */
package edu.sysu.http.impl;

import java.util.HashMap;

import edu.sysu.http.util.HttpGrammarException;
import edu.sysu.http.util.HttpRegex;

/**
 * @author Administrator
 * 
 *         Status = status-code SP reason-phrase
 */
public class HttpStatus {

	public static HttpStatus.Status SC_OK;
	public static HttpStatus.Status SC_ACCEPTED;
	public static HttpStatus.Status SC_BAD_REQUEST;
	public static HttpStatus.Status SC_FORBIDDEN;
	public static HttpStatus.Status SC_NOT_FOUND;

	public static HashMap<String, String> MapStatus = new HashMap<String, String>();

	static {
		try {
			HttpStatus.SC_OK = new HttpStatus.Status("200", "OK");

			MapStatus.put(HttpStatus.SC_OK.getStatusCode(), HttpStatus.SC_OK
					.getReasonPhrase());

			HttpStatus.SC_ACCEPTED = new HttpStatus.Status("202", "Accepted");

			MapStatus.put(HttpStatus.SC_ACCEPTED.getStatusCode(),
					HttpStatus.SC_ACCEPTED.getReasonPhrase());

			HttpStatus.SC_BAD_REQUEST = new HttpStatus.Status("400",
					"Bad Request");

			MapStatus.put(HttpStatus.SC_BAD_REQUEST.getStatusCode(),
					HttpStatus.SC_BAD_REQUEST.getReasonPhrase());

			HttpStatus.SC_FORBIDDEN = new HttpStatus.Status("403", "Forbidden");

			MapStatus.put(HttpStatus.SC_FORBIDDEN.getStatusCode(),
					HttpStatus.SC_FORBIDDEN.getReasonPhrase());

			HttpStatus.SC_NOT_FOUND = new HttpStatus.Status("404", "Not Found");

			MapStatus.put(HttpStatus.SC_NOT_FOUND.getStatusCode(),
					HttpStatus.SC_NOT_FOUND.getReasonPhrase());
		} catch (Exception e) {
		}
	}

	/**
	 * 
	 */
	public HttpStatus() {
		// TODO Auto-generated constructor stub
	}

	/**
	 * static class for Singleton design pattern, instance of HttpStatus will be
	 * created when the first time you make a call to HttpStatus.getInstance
	 * 
	 * @author Cyberpet
	 * @see HttpStatus#getInstance()
	 */
	// static class HttpStatusSingletonHolder {
	// static HttpStatus instance = new HttpStatus();
	// }
	/**
	 * get the only instance of HttpStatus
	 * 
	 * @return HttpStatus
	 * @see HttpStatus
	 */
	// public static HttpStatus getInstance() {
	// return HttpStatusSingletonHolder.instance;
	// }
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println(HttpStatus.SC_NOT_FOUND.getStatusCode() + " "
				+ HttpStatus.SC_NOT_FOUND.getReasonPhrase());
		System.out.println(HttpStatus.SC_OK.getStatusCode() + " "
				+ HttpStatus.SC_OK.getReasonPhrase());
		System.out.println(HttpStatus.SC_NOT_FOUND.toString());
	}

	public static class Status {

		private String statusCode;

		private String reasonPhrase;

		private final HttpRegex regexCode = new HttpRegex(HttpRules.DIGIT
				+ "{3}");

		public final HttpRegex getRegexCode() {
			return regexCode;
		}

		private HttpRegex regexPhrase = new HttpRegex("[" + HttpRules.TEXT
				+ "\\" + HttpRules.SP + "&&[^\\" + HttpRules.CR + "\\"
				+ HttpRules.LF + "]]+");

		public HttpRegex getRegexPhrase() {
			return regexPhrase;
		}

		public Status() {
		}

		public Status(String code, String phrase) throws HttpGrammarException {
			this.setStatusCode(code);
			this.setReasonPhrase(phrase);
		}

		/**
		 * @param statusCode
		 *            the statusCode to set
		 */
		public void setStatusCode(String statusCode)
				throws HttpGrammarException {
			if (regexCode.Match(statusCode))
				this.statusCode = statusCode;
			else
				throw new HttpGrammarException("Status-Code invalid.");
		}

		/**
		 * @return the statusCode
		 */
		public String getStatusCode() {
			return statusCode;
		}

		/**
		 * @param reasonPhrase
		 *            the reasonPhrase to set
		 */
		public void setReasonPhrase(String reasonPhrase)
				throws HttpGrammarException {
			if (regexPhrase.Match(reasonPhrase))
				this.reasonPhrase = reasonPhrase;
			else
				throw new HttpGrammarException("Reason-Phrase invalid.");
		}

		/**
		 * @return the reasonPhrase
		 */
		public String getReasonPhrase() {
			return reasonPhrase;
		}

		public String toString() {
			return this.getStatusCode() + HttpRules.SP + this.getReasonPhrase();
		}
	}

}