HttpClient 模拟登录后如何保持session

[languo]

HttpClient client = new HttpClient();

		client.getHostConfiguration().setHost( "localhost" , 7001, "http" );

		/**
		 * 模拟登陆门户系统
		 */
		PostMethod post = new PostMethod( "/wwt/login" );
		NameValuePair name = new NameValuePair( "username" , "pengxl");
		NameValuePair pass = new NameValuePair( "password" , "qqqq");
		post.setRequestBody( new NameValuePair[]{name,pass});
		client.executeMethod(post);
		
		/**
		 * 登录后的相关跳转
		 */
		System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
		int status = post.getStatusCode();
		boolean flag = true;
		if ((status == HttpStatus.SC_MOVED_TEMPORARILY) ||
	            (status == HttpStatus.SC_MOVED_PERMANENTLY) ||
	            (status == HttpStatus.SC_SEE_OTHER) ||
	            (status == HttpStatus.SC_TEMPORARY_REDIRECT)){
			flag = true;
		}else{
			flag = false;
		}
		GetMethod get = new GetMethod();
		int i = 0;
		while(flag){
			i++;
				System.out.println("第"+i+"步");
			 Header header = post.getResponseHeader("location");
			 if (header != null) {
				 String newuri = header.getValue();
				 if ((newuri == null) || (newuri.equals("")))
                                           newuri = "/";
				 get=new GetMethod(newuri);	
//				 get.setRequestHeader("Cookie",cookies.toString()); 
				 client.executeMethod(get);
//				 cookies=client.getState().getCookies();
				 status = get.getStatusCode();
				 if ((status == HttpStatus.SC_MOVED_TEMPORARILY) ||
				            (status == HttpStatus.SC_MOVED_PERMANENTLY) ||
				            (status == HttpStatus.SC_SEE_OTHER) ||
				            (status == HttpStatus.SC_TEMPORARY_REDIRECT)){
						flag = true;
					}else{
						flag = false;
					}
	         } 
		}
		HttpParams httpParams = client.getParams();
		
		String htmlvalue = new String(get.getResponseBodyAsString());
		PrintWriter out = response.getWriter();
        out.write(htmlvalue);

上面方法实现了A系统对B系统的登录，并且把登录后最终的页面输出到了A系统中，
现在存在一个问题，输出后的页面 session中不存在B系统需要的session，因此无法对该页面进一步操作，请教如何把HttpClient中的session内容取出并放到A系统中？

[rumlee]

下次请求时把前面请求获得的cookie再发回去就行了。

[languo]

下次请求是在A系统的页面中了，而不是在后续代码中再次请求

[rascalboy520]

登录成功后，HttpClient会保存cookie,
CookieSpec cookiespec = CookiePolicy.getDefaultSpec();
Cookie[] cookies = cookiespec.match(cookie_key, port, "/" , false , client.getState().getCookies());
具体的实现，你可以上网上查一下，
cookie_key 是你要用的cookie, port 是端口号，

[rascalboy520]

public static void main(String[] args) {
		HttpClient client = new HttpClient();
		NameValuePair[] nameValuePairs = {
				new NameValuePair("username", "aaa"),
				new NameValuePair("passwd", "123456")
		};
		PostMethod postMethod = new PostMethod("登录url");
		postMethod.setRequestBody(nameValuePairs);
		int stats = 0;
		try {
			stats = client.executeMethod(postMethod);
		} catch (HttpException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		postMethod.releaseConnection();//这里最好把之前的资源放掉
		CookieSpec cookiespec = CookiePolicy.getDefaultSpec();
		Cookie[] cookies = cookiespec.match("域名", 80/*端口*/, "/" , false , client.getState().getCookies());
		for (Cookie cookie : cookies) {
			System.out.println(cookie.getName() + "##" + cookie.getValue());
		}
		
		HttpMethod method = null;
		String encode = "utf-8";//页面编码,按访问页面改动
		String referer = "http://域名";//http://www.163.com
		method = new GetMethod("url2");//后续操作
		method.getParams().setParameter("http.useragent","Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)");
		method.setRequestHeader("Referer", referer);

		client.getParams().setContentCharset(encode);
		client.getParams().setSoTimeout(300000);
		client.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(10, true));
  
		try {
			stats = client.executeMethod(method);
		} catch (HttpException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		if (stats == HttpStatus.SC_OK) {
			System.out.println("提交成功!");
			
		}
	}

[meander]

[Quote=引用 4 楼 rascalboy520 的回复:]
Java code
public static void main(String[] args) {
HttpClient client = new HttpClient();
NameValuePair[] nameValuePairs = {
new NameValuePair("username", "aaa"),
new NameValuePair("passwd", "123456")
};
PostMethod postMethod = new PostMethod("登录url");
postMethod.setRequestBody(nameValuePairs);
int stats = …
[/Quote]

up

[languo]

String htmlvalue = new String(get.getResponseBodyAsString());
PrintWriter out = response.getWriter();
out.write(htmlvalue);
这里在页面中输出了之后，例如是一个系统链接，我在输出页面点这个链接，打开的页面会是回到登录页面。因为session根本就不存在

[languo]

你可能理解错我意思了，httpClient本身就可以保持cookie，我需要的模拟结果出来后获取页面流信息，把页面流信息输出到页面上，并且把模拟过程中的session等这些东西都要赋值到servlet的输出中。

[rascalboy520]

那你把数据用流打出来不就得了,
BufferedReader in = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(),encode));

[languo]

求助啊

[rascalboy520]

你应该在服务页面添加输出流,在请求页面添加输入流

[平淡面对]

其实lz的做法是应该实现系统B的proxy。在返回的页面，用户的浏览器应该是显示A系统的网址。所以没有可能直接去设置B系统的cookie。

[languo]

up

[worm-wei]

用登陆时用的那个 HttpClient 对象，对你要访问的页面
做 get 方式 访问 ( getMethod ) 就 哦 了

[taotaoyong]

我也遇到同样的问题。。。。。

[Daniel-C]

请问一下,你这个问题解决了吗,我现在用httpclient的post登陆一个网站(UVA oj)之后也不能正确连接到redirect的页面,而是返回到用户登录页面.