网页爬虫小记：两种方式的爬取网站内容

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

public class HttpLogin {
 
    public static void main(String[] args) {
        // 登陆前 Url
        String loginUrl = "http://passport.mop.com/?targetUrl=http://hi.mop.com/?&g=1447141423230&loginCheck=UNLOGINED";
　　　　　// http客户端
        HttpClient httpClient = new HttpClient();
 
        // 模拟登陆，按实际服务器端要求选用 Post 或 Get 请求方式
        PostMethod postMethod = new PostMethod(loginUrl);
 
        // 设置登陆时要求的信息，用户名和密码
        NameValuePair[] data = { new NameValuePair("username", "**"), new NameValuePair("password", "**") };
        postMethod.setRequestBody(data);

　　　　　try {
            // 设置 HttpClient 接收 Cookie,用与浏览器一样的策略
            httpClient.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);
            int statusCode = httpClient.executeMethod(postMethod);
                             
            // 获得登陆后的 Cookie
            Cookie[] cookies = httpClient.getState().getCookies();
            StringBuffer tmpcookies = new StringBuffer();
            for (Cookie c : cookies) {
                tmpcookies.append(c.toString() + ";");
                System.out.println("cookies = "+c.toString());
            }

            //登录后需要登录的网页

if(statusCode==302){//重定向到新的URL
                System.out.println("模拟登录成功");
                // 进行登陆后的操作
                GetMethod getMethod = new GetMethod(dataUrl);
                // 每次访问需授权的网址时需带上前面的 cookie 作为通行证
                getMethod.setRequestHeader("cookie", tmpcookies.toString());
                // 你还可以通过 PostMethod/GetMethod 设置更多的请求后数据
                // 例如，referer 从哪里来的，UA 像搜索引擎都会表名自己是谁，无良搜索引擎除外
                postMethod.setRequestHeader("Referer", "http://passport.mop.com/");
                postMethod.setRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36");
                httpClient.executeMethod(getMethod);
                // 打印出返回数据，检验一下是否成功
                String text = getMethod.getResponseBodyAsString();
                System.out.println(text);
            }
            else {
                System.out.println("登录失败");
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}

private static Integer TIMEOUT = 10000;
private static String USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36";
private static String URL="登陆请求发送的url";
public static Map getLoginCookeis(){
try {
     //此处数据需要在页面上登陆页面，测试一下，获取登录时发送的登陆请求数据
     Map map = new HashMap();
     map.put("username", "用户名");
     map.put("password", "密码");


     Map map1 = new HashMap();
     map1.put("ASPSESSIONIDASBTBDDT", "ACABMBFDKBGHOLHBHMKKMHLA");
     map1.put("Sailing", "Skin=");
     map1.put("wwwkechengbiaonetjecas", "UserName=%D5%C5%C8%CB%C0%FB&AdminLoginCode=&AdminName=%D5%C5%C8%CB%C0%FB&LastPassword=v0rdu3g775Uqy735&UnreadMsg=&UserPassword=877b0591474be1fb&RndPassword=v0rdu3g775Uqy735&AdminPassword=877b0591474be1fb");

     //发送登录请求
     Connection.Response rs = Jsoup.connect(URL)
                    .postDataCharset("GB2312")//编码格式
                    .data(map)//请求参数
                    .userAgent(USER_AGENT)
                    .cookies(map1)//cookies
                    .timeout(TIMEOUT)//超时
                    .method(Connection.Method.POST)
                    .execute();
            map1 = rs.cookies();//获取登录的cookies
            

　　　　　　　//*** 获取到cookie后，后边就可以使用cookie进行二次登录，然后获取网页目的信息，进行爬取操作；

            return map1;
        } catch (IOException ex) {
            Logger.getLogger(KechengbiaoLogin.class.getName()).log(Level.SEVERE, null, ex);
            return null;
        }
    }