java http請求cookie傳遞

package cs;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ConnectException;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

public class HttpUtil {

	public static String http(String url) {
		URL u = null;
		HttpURLConnection con = null;
		try {
			u = new URL(url);
			con = (HttpURLConnection) u.openConnection();
			con.setRequestMethod("GET");
			con.setDoOutput(true);
			con.setDoInput(true);
			con.setUseCaches(false);
			
			con.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded; text/html; charset=UTF-8");
			con.setConnectTimeout(30000);  
			con.setReadTimeout(30000);
			OutputStreamWriter osw = new OutputStreamWriter(con.getOutputStream(), "UTF-8");
			osw.write(sb.toString());
			osw.flush();
			osw.close();
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}  finally {
			if (con != null) {
				con.disconnect();
			}
		}
		//從請求中獲取cookie列表
		String cookieskey = "Set-Cookie";  
	    Map<String, List<String>> maps = con.getHeaderFields();  
	    List<String> coolist = maps.get(cookieskey);  
	    Iterator<String> it = coolist.iterator();  
	    StringBuffer sbu = new StringBuffer();  
	    //拼接cookie再請求
	    sbu.append("eos_style_cookie=default; ");  
	    while(it.hasNext()){  
	        sbu.append(it.next()+";");  
	    }  
	    String ss = sbu.toString();
	    ss = ss.substring(0, ss.length()-1);
	    URL u1 = null;
		HttpURLConnection con1 = null;
		try {
			u1 = new URL("http://localhost:8080/shop");
			con1 = (HttpURLConnection) u1.openConnection();
			con1.setRequestMethod("GET");
			con1.setDoInput(true);
			con1.setUseCaches(false);
			con1.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded; text/html; charset=UTF-8");
			con1.setRequestProperty("Cookie",ss);
			con1.setConnectTimeout(30000);  
			con1.setReadTimeout(30000);   
			
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}  finally {
			if (con1 != null) {
				con1.disconnect();
			}
		}
		StringBuffer buffer1 = new StringBuffer();
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(con1
					.getInputStream(), "UTF-8"));
			String temp;
			while ((temp = br.readLine()) != null) {
				buffer1.append(temp);
				buffer1.append("\n");
			}
		} catch (Exception e) {
			if (e instanceof SocketTimeoutException) {
			} else if (e instanceof ConnectException) {
			}
			e.printStackTrace();
			return null;
		}
		StringBuffer buffer = new StringBuffer();
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(con
					.getInputStream(), "UTF-8"));
			String temp;
			while ((temp = br.readLine()) != null) {
				buffer.append(temp);
				buffer.append("\n");
			}
		} catch (Exception e) {
			if (e instanceof SocketTimeoutException) {
			} else if (e instanceof ConnectException) {
			}
			e.printStackTrace();
			return null;
		}

		return buffer.toString();
	}

我的見解：有時候能夠獲取cookie中的sessionid 【或其餘緩衝中】，再把cookie注入到http中模擬http請求登出url，能夠實現用戶的登出。這樣在帳號直接互相關聯登錄有必定使用