使用httpclient发送get、post请求

1.get请求
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://targethost/homepage");
CloseableHttpResponse response1 = httpclient.execute(httpGet);

// 建立的http连接，仍旧被response1保持着，允许我们从网络socket中获取返回的数据
// 为了释放资源，我们必须手动消耗掉response1或者取消连接
//（使用CloseableHttpResponse类的close方法）

try {
//response1.getStatusLine();
//此处可以通过responses获取响应内容，getEntity方法获取响应体。
HttpEntity entity1 = response1.getEntity();
// do something useful with the response body
// and ensure it is fully consumed
EntityUtils.consume(entity1);
} finally {
response1.close();
}

2.post 请求
Post请求关键在于发送参数，参数分为两种：一种是键值对，另一种是纯文本。
HttpClient 均支持这两种方式：

HttpPost httpPost = new HttpPost("url");
// 拼接键值参数
// List  nvps = new ArrayList ();
// nvps.add(new BasicNameValuePair("username", "vip"));
// nvps.add(new BasicNameValuePair("password", "secret"));
// httpPost.setEntity(new UrlEncodedFormEntity(nvps));

//使用文本参赛
HttpEntity he = new StringEntity("{\"method\":\"\",\"params\":[]}");
httpPost.setEntity(he);
httpPost.addHeader("Cookie","AwAAY&dp0gkAIIugIgJOWqoYA");
httpPost.addHeader("User-Agent",
"Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0");
httpPost.addHeader("Host", "www.yahoo.com");

CloseableHttpResponse response2 = httpclient.execute(httpPost);
try {
System.out.println(response2.getStatusLine());
HttpEntity entity2 = response2.getEntity();
InputStream is = entity2.getContent();

BufferedReader br = new BufferedReader(new InputStreamReader(is));
String content = null;
while ((content = br.readLine()) != null) {
int count = StringUtils.countMatches(content, "conversation");
System.out.println(count);
}
br.close();
// 消耗掉response
EntityUtils.consume(entity2);
} finally {
response2.close();
}