HttpsURLConnection 和 POST

Question

不久前，我用Python写了一个程序，这个程序可以通过HTTPS登录一个网站，获取一些信息，然后再退出。这个程序其实挺简单的：

class Richiesta(object):

def __init__(self,url,data):
    self.url = url
    self.data = ""
    self.content = ""
    for k, v in data.iteritems():
        self.data += str(k)+"="+str(v)+"&"
    if(self.data == ""):
        self.req = urllib2.Request(self.url)
    else:
        self.req = urllib2.Request(self.url,self.data)
    self.req.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 5.1; rv:2.0b6) Gecko/20100101 Firefox/4.0b6')
    self.req.add_header('Referer', baseurl+'/www/')
    self.req.add_header('Cookie', cookie )

def leggi(self):
    while(self.content == ""):
        try:
            r = urllib2.urlopen(self.req)
        except urllib2.HTTPError, e:
            print("Errore del server, nuovo tentativo tra 15 secondi")
            time.sleep(15)                
        except urllib2.URLError, e:
            print("Problema di rete, proverò a riconnettermi tra 20 secondi")
            time.sleep(20)
        else:
                self.content = r.read().decode('utf-8')
def login(username,password):
    global cookie
    print("Inizio la procedura di login")
    url = "https://example.com/auth/Authenticate"
    data = {"login":"1","username":username,"password":password}
    f = Richiesta(url,data)
    f.leggi()

现在，由于某种原因，我需要把它转换成Java。到目前为止，我写了这个：

import java.net.*;
import java.security.Security.*;
import java.io.*;
import javax.net.ssl.*;

public class SafeReq {
    String baseurl = "http://www.example.com";
    String useragent = "Mozilla/5.0 (Windows NT 5.1; rv:2.0b6) Gecko/20100101 Firefox/4.0b6";
    String content = "";

    public SafeReq(String s, String sid, String data) throws MalformedURLException {
        try{
            URL url = new URL(s);
            HttpsURLConnection request = ( HttpsURLConnection ) url.openConnection();

            request.setUseCaches(false);
            request.setDoOutput(true);
            request.setDoInput(true);

            request.setFollowRedirects(true);
            request.setInstanceFollowRedirects(true);

            request.setRequestProperty("User-Agent",useragent);
            request.setRequestProperty("Referer","http://www.example.com/www/");
            request.setRequestProperty("Cookie","sid="+sid);
            request.setRequestProperty("Origin","http://www.example.com");
            request.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
            request.setRequestProperty("Content-length",String.valueOf(data.length()));

            request.setRequestMethod("POST");
            OutputStreamWriter post = new OutputStreamWriter(request.getOutputStream());
            post.write(data);
            post.flush();

            BufferedReader in = new BufferedReader(new InputStreamReader(request.getInputStream()));
            String inputLine;
            while ((inputLine = in.readLine()) != null) {
                content += inputLine;
            }
            post.close();
            in.close();
        } catch (IOException e){
            e.printStackTrace();
        }
    }

    public String leggi(){
        return content;
    }
}

问题是，登录不成功，当我尝试访问需要登录的页面时，系统提示我“请重新登录”。这两个类看起来差不多，我就是搞不懂为什么第二个不能正常工作……有什么想法吗？

java 网络编程 https 登录 %post httpsurlconnection

HttpsURLConnection 和 POST

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