模拟登陆CSDN——就是这么简单「建议收藏」

/**
 * Http工具类
 * 
 * @author Zhu
 * 
 */
public class HttpUtils {

	private static CloseableHttpClient httpClient = HttpClients.createDefault();
	private static HttpClientContext context = new HttpClientContext();

	private HttpUtils() {

	}

	public static String sendGet(String url) {
		CloseableHttpResponse response = null;
		String content = null;
		try {
			HttpGet get = new HttpGet(url);
			response = httpClient.execute(get, context);
			HttpEntity entity = response.getEntity();
			content = EntityUtils.toString(entity);
			EntityUtils.consume(entity);
			return content;
		} catch (Exception e) {
			e.printStackTrace();
			if (response != null) {
				try {
					response.close();
				} catch (IOException e1) {
					e1.printStackTrace();
				}
			}
		}
		return content;
	}

	public static String sendPost(String url, List<NameValuePair> nvps) {
		CloseableHttpResponse response = null;
		String content = null;
		try {
			//　HttpClient中的post请求包装类
			HttpPost post = new HttpPost(url);
			// nvps是包装请求參数的list
			if (nvps != null) {
				post.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"));
			}
			// 运行请求用execute方法，content用来帮我们附带上额外信息
			response = httpClient.execute(post, context);
			// 得到对应实体、包含响应头以及对应内容
			HttpEntity entity = response.getEntity();
			// 得到response的内容
			content = EntityUtils.toString(entity);
			//　关闭输入流
			EntityUtils.consume(entity);
			return content;
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (response != null) {
				try {
					response.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return content;
	}
}

	/**
	 * 获取必要的登陆參数信息
	 * 
	 * @throws IOException
	 */
	private void fetchNecessaryParam() throws IOException {
		// 查看CSDN登陆页面源代码发现登陆时须要post5个參数
		// name、password，另外三个在页面的隐藏域中，a good start
		logger.info("获取必要的登陆信息。。。。。");
		// 这样登陆不行，由于第一次须要訪问须要拿到上下文context
		// Document doc = Jsoup.connect(LOGIN_URL).get();
		String html = HttpUtils.sendGet(LOGIN_URL);
		Document doc = Jsoup.parse(html);
		Element form = doc.select(".user-pass").get(0);
		lt = form.select("input[name=lt]").get(0).val();
		execution = form.select("input[name=execution]").get(0).val();
		_eventId = form.select("input[name=_eventId]").get(0).val();
		logger.info("获取成功。。。。。");	}

	private boolean mockLogin() {		logger.info("開始登陆。。。。。");		boolean result = false;		List<NameValuePair> nvps = new ArrayList<NameValuePair>();		nvps.add(new BasicNameValuePair("username", username));		nvps.add(new BasicNameValuePair("password", password));		nvps.add(new BasicNameValuePair("lt", lt));		nvps.add(new BasicNameValuePair("execution", execution));		nvps.add(new BasicNameValuePair("_eventId", _eventId));		String ret = HttpUtils.sendPost(LOGIN_URL, nvps);		if (ret.indexOf("redirect_back") > -1) {			logger.info("登陆成功。。。。。");			result = true;		} else if (ret.indexOf("登录太频繁") > -1) {			logger.info("登录太频繁。请稍后再试。。。。。");		} else {			logger.info("登陆失败。。。。。");		}		return result;	}