package org.jshand.utils.http;  
  
import java.io.FileOutputStream;  
  
import org.apache.http.HttpEntity;  
import org.apache.http.HttpResponse;  
import org.apache.http.client.CookieStore;  
import org.apache.http.client.methods.HttpGet;  
import org.apache.http.client.methods.HttpPost;  
import org.apache.http.impl.client.DefaultHttpClient;  
import org.apache.http.impl.conn.PoolingClientConnectionManager;  
import org.apache.http.util.EntityUtils;  
  
/** 
 * TODO(用一句話描述該文件的作用) 
 *  
 * @title: HttpClientDemo.java 
 * @author zhangjinshan-ghq 
 * @date 2014-6-11 14:59:04 
 */  

public class HttpClientDemo  
{  

/** 
 * The main method. 
 *  
 * @param args the arguments 
 * @throws Exception the exception 
 */  
public static void main(String[] args) throws Exception  
{  
    getResoucesByLoginCookies();  
}  

/** 
 * 根據(jù)登錄Cookie獲取資源 
 * 一切異常均未處理，需要酌情檢查異常 
 *  
 * @throws Exception 
 */  
private static void getResoucesByLoginCookies() throws Exception  
{  
    HttpClientDemo demo = new HttpClientDemo();  
    String username = "XXXXXXXXX";// 登錄用戶  
    String password = "XXXXXXXX";// 登錄密碼  

    // 需要提交登錄的信息  
    String urlLogin = "http://www.iteye.com/login?name=" + username + "&password=" + password;  

    // 登錄成功后想要訪問的頁面 可以是下載資源 需要替換成自己的iteye Blog地址  
    String urlAfter = "http://314649444.iteye.com/";  

    DefaultHttpClient client = new DefaultHttpClient(new PoolingClientConnectionManager());  

    /** 
     * 第一次請求登錄頁面 獲得cookie 
     * 相當(dāng)于在登錄頁面點(diǎn)擊登錄，此處在URL中 構(gòu)造參數(shù)， 
     * 如果參數(shù)列表相當(dāng)多的話可以使用HttpClient的方式構(gòu)造參數(shù) 
     * 此處不贅述 
     */  
    HttpPost post = new HttpPost(urlLogin);  
    HttpResponse response = client.execute(post);  
    HttpEntity entity = response.getEntity();  
    CookieStore cookieStore = client.getCookieStore();  
    client.setCookieStore(cookieStore);  

    /** 
     * 帶著登錄過的cookie請求下一個(gè)頁面，可以是需要登錄才能下載的url 
     * 此處使用的是iteye的博客首頁，如果登錄成功，那么首頁會顯示【歡迎XXXX】 
     *  
     */  
    HttpGet get = new HttpGet(urlAfter);  
    response = client.execute(get);  
    entity = response.getEntity();  

    /** 
     * 將請求結(jié)果放到文件系統(tǒng)中保存為 myindex.html,便于使用瀏覽器在本地打開 查看結(jié)果 
     */  

    String pathName = "d:\\myindex.html";  
    writeHTMLtoFile(entity, pathName);  
}  

/** 
 * Write htmL to file. 
 * 將請求結(jié)果以二進(jìn)制形式放到文件系統(tǒng)中保存為.html文件,便于使用瀏覽器在本地打開 查看結(jié)果 
 *  
 * @param entity the entity 
 * @param pathName the path name 
 * @throws Exception the exception 
 */  
public static void writeHTMLtoFile(HttpEntity entity, String pathName) throws Exception  
{  

    byte[] bytes = new byte[(int) entity.getContentLength()];  

    FileOutputStream fos = new FileOutputStream(pathName);  

    bytes = EntityUtils.toByteArray(entity);  

    fos.write(bytes);  

    fos.flush();  

    fos.close();  
}  

}

第二種方式：在httpclient里配置cookie的管理方式，自動管理cookie

//創(chuàng)建自動管理cookie的httpClient
// RequestConfig requestConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT).build();
// CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(requestConfig).build();