httpclient 中post请求重定向

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背景：使用httpclient 的post请求进行登录，需要重定向登录，请求重定向后的地址

在httpclient中post请求不像get请求自己可以重定向，实现方式是判断post请求返回码是否是302，如果是那么就获取传递过来的Location的地址，进行拼接，在进行一个get的请求

实现代码

public Map<String, String> doPost(String url, Map<String, String> map, String charset) {

		HttpClient httpClient = null;

		HttpPost httpPost = null;

		String result = null;

		String domain = "http://user.hqygou.com";

		Map<String, String> returnmap = new HashMap<String, String>();

		try {

			httpClient = new SSLClient();

			httpPost = new HttpPost(url);

			// 设置参数

			List<NameValuePair> list = new ArrayList<NameValuePair>();

			Iterator iterator = map.entrySet().iterator();

			while (iterator.hasNext()) {

				Entry<String, String> elem = (Entry<String, String>) iterator.next();

				list.add(new BasicNameValuePair(elem.getKey(), elem.getValue()));

				System.out.println("请求的参数为:" + elem.getKey() + ":" + elem.getValue());

			}

			if (list.size() > 0) {

				UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);

				httpPost.setEntity(entity);

			}

			// 设置头部信息

			httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");

			HttpResponse response = httpClient.execute(httpPost);

			if (response != null) {

				int code = response.getStatusLine().getStatusCode();

				System.out.println("返回的code为:" + code);

				if (code == 302) {  #判断post的请求返回码

					Header[] hr = response.getAllHeaders();

					for (int i = 0; i < hr.length; i++) {

						Header header1 = hr[i];

						System.out.println("头部的所有内容：" + header1);

					}

					String hearder = response.getHeaders("Location")[0].toString().split(":")[1].trim(); #获取返回码中头部中location 就是重定向的地址

					String redirecturl = domain + hearder;  //需要和域名进行拼接

					System.out.println("开始重定向,地址为:" + redirecturl);

					cookies = response.getHeaders("Set-Cookie")[0].toString().split(":")[1].trim();

					System.out.println("获取的cookie:" + cookies);

					cookies = cookies.split(";")[0].trim();

					httpGet(redirecturl, cookies);  #get请求，把获取的cookie进行一个拼接

				} else {

					HttpEntity resEntity = response.getEntity();

					if (resEntity != null) {

						result = EntityUtils.toString(resEntity, charset);

					}

				}

				returnmap.put("content", result);

				returnmap.put("cookies", cookies);

			}

		} catch (Exception ex) {

			ex.printStackTrace();

		}

		return returnmap;

	}

运行入口

	public static void main(String[] args) {

		test post = new test();

		String url = "http://xxx/login/index/checklogin";

		Map<String, String> map = new HashMap<String, String>();

		map.put("from", "xx");

		map.put("username", "xx");

		map.put("password", "xx");

		post.doPost(url, map, "UTF-8");

	}