HttpURLConnection CookieManager Post提交

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class Test ...{

    public static void main(String[] args) ...{

        try ...{
            String encoding = "UTF-8";
            // Construct data
            String data = URLEncoder.encode("Email", encoding) + "="
                    + URLEncoder.encode("username", encoding);
            data += "&" + URLEncoder.encode("Passwd", encoding) + "="
                    + URLEncoder.encode("password", encoding);

            // Cookie handler
            CookieManager manager = new CookieManager();
            manager.setCookiePolicy(java.net.CookiePolicy.ACCEPT_ALL);
            CookieHandler.setDefault(manager);

            // Send data
            URL url = new URL(
                    "https://www.google.com/accounts/ServiceLoginAuth?service=mail");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestProperty("user-agent",
                    "mozilla/4.0 (compatible; msie 6.0; windows 2000)");
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.setAllowUserInteraction(true);
            conn.setUseCaches(true);
            conn.getOutputStream().write(data.getBytes(encoding));
            conn.getOutputStream().flush();
            conn.getOutputStream().close();

            // Get the response
            BufferedReader rd = new BufferedReader(new InputStreamReader(conn
                    .getInputStream(), encoding));
            BufferedWriter wt = new BufferedWriter(new OutputStreamWriter(
                    new FileOutputStream("out.html")));
            String line;
            while ((line = rd.readLine()) != null) ...{
                wt.write(line);
                wt.write(" ");
            }
            wt.close();
            rd.close();
            conn.disconnect();
        } catch (Exception e) ...{
            e.printStackTrace();
        }
    }
}

 
如果没有加入cookie handler的话，gmail就会说需要浏览器支持cookie。
需要注意的是：CookieManager和CookiePolicy类在jdk1.6中新加入的。