本例使用httpclient 3.0.jar

package test;

import org.apache.commons.httpclient.Cookie;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.cookie.CookiePolicy;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;

/**
 * @author 作者 ：chenzenan E-mail:
 
[email protected]
 * @version 建立時間：2012-8-10 下午04:35:48 Copyright ? 2012-8-10 Shanghai XXX Co.
 *          Ltd. All right reserved.
 */
public class HttpClientLogin {

	public static void main(String[] args) {
		// 登陸 Url
		String loginUrl = "http://localhost/login.jsp";
		// 需登陸後訪問的 Url
		String dataUrl = "http://localhost/applyopen/printApprize.jsp?iid=1516";

		HttpClient httpClient = new HttpClient();

		// 模擬登陸，按實際伺服器端要求選用 Post 或 Get 請求方式
		PostMethod postMethod = new PostMethod(loginUrl);

		// 設定登陸時要求的資訊，使用者名稱和密碼
		NameValuePair[] data = { new NameValuePair("name", "admin"),
				new NameValuePair("password", "123456") };
		postMethod.setRequestBody(data);
		try {
			// 設定 HttpClient 接收 Cookie,用與瀏覽器一樣的策略
			httpClient.getParams().setCookiePolicy(
					CookiePolicy.BROWSER_COMPATIBILITY);
			httpClient.executeMethod(postMethod);
			// 獲得登陸後的 Cookie
			Cookie[] cookies = httpClient.getState().getCookies();
			StringBuffer tmpcookies = new StringBuffer();
			for (Cookie c : cookies) {
				tmpcookies.append(c.toString() + ";");
			}
			// 進行登陸後的操作1581,1602,1603,1610,1609,1608,1607,1606,1605,1620,1619,1617,1616,1622,1626,1642,1648,1647,1657
			GetMethod getMethod = new GetMethod(dataUrl);
			// 每次訪問需授權的網址時需帶上前面的 cookie 作為通行證
			getMethod.setRequestHeader("cookie", tmpcookies.toString());
			// 你還可以通過 PostMethod/GetMethod 設定更多的請求後資料
			// 例如，referer 從哪裡來的，UA 像搜尋引擎都會表名自己是誰，無良搜尋引擎除外
			postMethod.setRequestHeader("Referer", "http://www.cc");
			postMethod.setRequestHeader("User-Agent", "www Spot");
			httpClient.executeMethod(getMethod);
			// 打印出返回資料，檢驗一下是否成功
			String text = getMethod.getResponseBodyAsString();
			System.out.println(text);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}