JAVA程序通过后台登陆网站,获取Session,然后再POST Http Request添加数据到

 * 1,在HTTP的WEB应用中, 应用客户端和服务器之间的状态是通过Session来维持的, 而Session的本质就是Cookie,
 * 简单的讲,当浏览器向服务器发送Http请求的时候, HTTP服务器会产生一个SessionID,这个SessionID就唯一的标识了一个客户端到服务器的请求会话过程.
 * 就如同一次会议开始时,主办方给每位到场的嘉宾一个临时的编号胸牌一样, 可以通过这个编号记录每个嘉宾(客户端)的活动(请求状态).
 * 为了保持这个状态, 当服务端向客户端回应的时候,会附带Cookie信息,当然,Cookie里面就包含了SessionID
 * 客户端在执行一系列操作时向服务端发送请求时,也会带上这个SessionID, 一般来说,Session也是一个URL QueryParameter ,就是说,session可以以Key-Value的形式通过URL传递
 * 比如,http://www.51etest.com/dede/login.php?PHPSESSIONID=7dg3dsf19SDf73wqc32fdsf
 * 一般而言,浏览器会自动把此Session信息放入Header报文体中进行传递.
 * 如果浏览器不支持Cookie,那么,浏览器会自动把SessionID附加到URL中去.
 *
 * 2,在这个例子中,以登陆这个功能点进行讲解.
 * 首先,我们登陆的页面是http://www.51etest.com/dede, 我们第一次访问这个页面后,可以从服务器过来的Http Response报文中的Header中找出服务器与浏览器向关联的数据 -- Cookie,
 * 而且Session的值也在Cookie中. 于是,我们可以通过分析Set-Cookie这个Header中的参数的值,找到Seesion的Key-Value段.
 * 然后,我们再向服务器发送请求,请求URL为:post@@http://www.51etest.com/dede/login.php@@userid=admin&pwd=tidus2005&gotopage=/dede/&dopost=login
 * 服务器验证登陆成功了, 并且在此次会话变量中增加了我们登陆成功的标识.
 *
 * 3,增加一个广告定义
 * 增加一个广告定义其实就是一个添加数据的过程,无非是我们把我们要添加的数据通过参数的形式告诉指定url页面,页面获取后添加到数据库去而已.
 * 此url地址为:
 * post@@http://www.51etest.com/dede/ad_add.php@@dopost=save&tagname=test&typeid=0&adname=test&starttime=2008-05-29
 * 因为这个页面会先判断我是否登陆
 * 而判断的依据，前面讲了，就是根据我请求时的SessionID找到指定的Session数据区中是否存在我的登陆信息，
 * 所以我当然要把访问登陆页面时获取的SessionID原封不动的再发回去
 * 相当于对服务器说，这是我刚刚来时，你发我的临时身份证，我现在可以形势我的权利。
 *
 * 这就是整个Java后台登陆网站，然后添加数据的过程。

 

package cn.javadr.product;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

/**
 * HttpClient
 * 
 * @author Tang Ren email: <a
 *         href="mailto:[e-mail]">[e-mail]</a>
 * 
 * post@@http://www.51etest.com/dede/login.php@@userid=xxxx&pwd=xxxxxx&gotopage=/dede/&dopost=login
 * 
 * post@@http://www.51etest.com/dede/ad_add.php@@dopost=save&tagname=test&typeid=0&adname=test&starttime=2008-05-29
 * 20:58:25&endtime=2008-06-28 20:58:25×et=0&normbody=test&expbody=test
 * 
 */

/**
 * 
 */
public class HttpClient {

	private static final String USER_AGENT_VALUE = "Mozilla/4.0 (compatible; MSIE 6.0; Windows XP)";

	/**
	 * Cmd splitor default is symbol '$$'.
	 */
	private static final String HTTP_CLIENT_CMD_SPLITOR = "@@";

	/**
	 * Post parameter splitor default is symbol '&'.
	 */
	private static final String POST_PARAMETER_SPLITOR = "&";

	private static final String POST_PARAMETER_KV_SPLITOR = "=";

	private String cookie = null;

	private Map cookieMap = new HashMap();

	public static void main(String[] args) {
		HttpClient client = new HttpClient();
	}

	public HttpClient() {
		// Input http request url

		BufferedReader consleReader = new BufferedReader(new InputStreamReader(
				System.in));
		String httpResponse = null;
		String url = null;
		String cmd = null;
		String method = null;
		try {
			while (true) {
				cmd = consleReader.readLine();
				if (cmd.indexOf(HTTP_CLIENT_CMD_SPLITOR) == -1)
					continue;

				method = cmd.split(HTTP_CLIENT_CMD_SPLITOR)[0];
				url = cmd.split(HTTP_CLIENT_CMD_SPLITOR)[1];
				if (method.toUpperCase().equals("GET")) {
					httpResponse = this.getMethod(url, true);
				} else if (method.toUpperCase().equals("POST")) {
					Map parameters = this.parsePostParameters(cmd
							.split(HTTP_CLIENT_CMD_SPLITOR)[2]);
					httpResponse = this.postMethod(url, parameters, true);
				}
				System.out.println(httpResponse);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				consleReader.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

	/**
	 * Request specifid url with 'GET' method. And return HTTP response content.
	 * 
	 * @param url
	 * @return
	 */
	private String getMethod(String url, boolean keepCookie) {
		if (url == null || url.length() == 0) {
			return "Requst url could not be null or empty.";
		}

		StringBuffer result = new StringBuffer();
		try {
			HttpURLConnection httpURLConnection = this.getHttpURLConnection(
					url, keepCookie);

			// Set request properties.
			this.settingHttpRequestHeader(httpURLConnection);

			httpURLConnection.setRequestMethod("GET");

			// Getting or setting cookie
			this.gettingOrSettingCookie(httpURLConnection, keepCookie);

			InputStream httpInputStream = httpURLConnection.getInputStream();
			BufferedReader httpBufferedReader = new BufferedReader(
					new InputStreamReader(httpInputStream, "GBK"));
			result.append(this.readBufferedContent(httpBufferedReader));

			// Connect to host.
			httpURLConnection.connect();
		} catch (IOException e) {
			e.printStackTrace();
			return "getHttpURLConnection failed.";
		}
		return result.toString();
	}

	public String postMethod(String url, Map parameters, boolean keepCookie) {
		StringBuffer httpResponse = new StringBuffer();

		HttpURLConnection httpURLConnection = null;
		OutputStream httpOutputStream = null;
		try {
			httpURLConnection = this.getHttpURLConnection(url, keepCookie);
			// Set request properties.
			this.settingHttpRequestHeader(httpURLConnection);

			// Set request method with 'POST'
			httpURLConnection.setRequestMethod("POST");

			// Set connection output is true.
			httpURLConnection.setDoOutput(true);
			// Getting or setting cookie
			this.gettingOrSettingCookie(httpURLConnection, keepCookie);
			// Get Http output stream
			httpOutputStream = httpURLConnection.getOutputStream();

			// Build post parameters string
			StringBuffer postParams = new StringBuffer();
			int index = 0;
			for (Iterator<Entry> iter = parameters.entrySet().iterator(); iter
					.hasNext(); index++) {
				Entry<String, String> entry = iter.next();
				postParams.append(index != 0 ? "&" : "");
				postParams.append(entry.getKey());
				postParams.append("=");
				postParams.append(entry.getValue());
			}
			httpOutputStream.write(postParams.toString().getBytes());

			BufferedReader httpBufferedReader = new BufferedReader(
					new InputStreamReader(httpURLConnection.getInputStream()));
			httpResponse.append(this.readBufferedContent(httpBufferedReader));
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		} finally {
			try {
				httpOutputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return httpResponse.toString();
	}

	/**
	 * Setting HTTP request header properties
	 * 
	 * @param httpURLConnection
	 */
	private void settingHttpRequestHeader(HttpURLConnection httpURLConnection) {
		if (httpURLConnection == null)
			return;
		httpURLConnection.setRequestProperty("User-Agent", USER_AGENT_VALUE);
		// TODO setting some other properties here . . .
	}

	/**
	 * Get HttpURLConnection by specified url string.
	 * 
	 * @param url
	 * @return
	 * @throws IOException
	 */
	private HttpURLConnection getHttpURLConnection(String url,
			boolean keepCookie) throws IOException {
		URL urlObj = new URL(url);
		URLConnection urlConnection = urlObj.openConnection();
		if (urlConnection instanceof HttpURLConnection)
			return (HttpURLConnection) urlConnection;
		throw new MalformedURLException();
	}

	/**
	 * Read bufferedReader buffered content.
	 * 
	 * @param bufferedReader
	 * @return
	 */
	private String readBufferedContent(BufferedReader bufferedReader) {
		if (bufferedReader == null)
			return null;
		StringBuffer result = new StringBuffer();
		String line = null;
		try {
			while ((line = bufferedReader.readLine()) != null) {
				result.append(line);
			}
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
		return result.toString();
	}

	/**
	 * Parse and create parameter map with parameter string
	 * 
	 * @param parameterString
	 * @return
	 */
	private Map parsePostParameters(String parameterString) {
		if (parameterString == null || parameterString.length() == 0)
			return null;
		Map result = new HashMap<String, String>();

		// only one parameter key-value pair
		if (parameterString.indexOf(POST_PARAMETER_SPLITOR) == -1) {
			if (parameterString.indexOf(POST_PARAMETER_KV_SPLITOR) != -1)
				result.put(parameterString.split(POST_PARAMETER_KV_SPLITOR)[0],
						parameterString.split(POST_PARAMETER_KV_SPLITOR)[1]);
		} else {
			String[] keyValues = parameterString.split(POST_PARAMETER_SPLITOR);
			for (int i = 0; i < keyValues.length; i++) {
				String keyValue = keyValues[i];
				result.put(keyValue.split(POST_PARAMETER_KV_SPLITOR)[0],
						keyValue.split(POST_PARAMETER_KV_SPLITOR)[1]);
			}
		}
		return result;
	}

	/**
	 * Get or set cookie.
	 * 
	 * @param httpURLConnection
	 * @param keepCookie
	 */
	private void gettingOrSettingCookie(HttpURLConnection httpURLConnection,
			boolean keepCookie) {
		// Getting or setting cookie.
		if (cookie == null || cookie.length() == 0) {
			String setCookie = httpURLConnection.getHeaderField("Set-Cookie");
			cookie = setCookie.substring(0, setCookie.indexOf(";"));
		} else if (keepCookie) {
			httpURLConnection.setRequestProperty("Cookie", cookie);
		}
	}
}

 

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