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");}
注，后面这个200,是get请求时返回的内容，get请求可以查看另外一篇文章，http://www.cnblogs.com/chongyou/p/7808035.html
httpclient 中post请求重定向
原文地址：http://www.cnblogs.com/chongyou/p/7807986.html