1.依赖
httpclient
4.5.2
2.请求步骤
使用帮助类HttpClients创建CloseableHttpClient对象.
基于要发送的HTTP请求类型创建HttpGet或者HttpPost实例.
使用addHeader方法添加请求头部,诸如User-Agent, Accept-Encoding等参数.
可调用HttpGet、HttpPost共同的setParams(HetpParams params)方法来添加请求参数；对于HttpPost对象而言，也可调用setEntity(HttpEntity entity)方法来设置请求参数。
通过执行此HttpGet或者HttpPost请求获取CloseableHttpResponse实例
从此CloseableHttpResponse实例中获取状态码,错误信息,以及响应页面等等.
释放连接。无论执行方法是否成功，都必须释放连接
3、GET方法
public void httpGet() {
CloseableHttpClient httpclient = ();
try {
// 创建httpget.
HttpGet httpget = new HttpGet("/");
("executing request " + ());
// 执行get请求.
CloseableHttpResponse response = (httpget);
try {
// 获取响应实体
HttpEntity entity = ();
// 打印响应状态
(());
if (entity != null) {
// 打印响应内容长度
("Response content length: " + ());
// 打印响应内容
("Response content: " + (entity));
}
} finally {
();
}
} catch (ClientProtocolException e) {
();
} catch (ParseException e) {
();
} catch (IOException e) {
();
} finally {
// 关闭连接,释放资源
try {
();
} catch (IOException e) {
();
}
}
}
4、POST方法
public static String httpPost(String host, int port, byte[] buf)
{
CloseableHttpClient httpClient = ();
CloseableHttpResponse httpResponse = null;
BufferedReader reader = null;
StringBuffer response = new StringBuffer();
try {
String url = "http://" + host + ":" + port;
HttpPost httpPost = new HttpPost(url);
RequestConfig requestConfig = ().setSocketTimeout(6000).setConnectTimeout(6000).build();//设置请求和传输超时时间
(requestConfig);
("User-Agent", "Mozilla/5.0");
ByteArrayEntity entity = new ByteArrayEntity(buf);
(entity);
httpResponse = (httpPost);
reader = new BufferedReader(new InputStreamReader(
().getContent()));
String inputLine;
while ((inputLine = ()) != null) {
(inputLine);
}
}catch (Exception var){
();
}finally {
if(reader != null){
();
}
if(httpResponse != null){
();
}
();
}
return ();
}