HttpClient
- HttpClient 4.1 以后不再在Apache Commons下，而是位于Apache HttpComponents
org.apache.commons.httpclient.HttpClient与org.apache.http.client.HttpClient的区别：
Commons的HttpClient项目现在是生命的尽头，不再被开发,已被Apache HttpComponents项目HttpClient和的HttpCore
模组取代，提供更好的性能和更大的灵活性。
- 目前版本为
HttpClient 4.5.5 (GA) - HttpClient的官网示例页面
- 一般用法
public final static void main(String[] args) throws Exception {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
HttpGet httpget = new HttpGet("http://httpbin.org/get");
System.out.println("Executing request " + httpget.getRequestLine());
CloseableHttpResponse response = httpclient.execute(httpget);
try {
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
// Get hold of the response entity
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
// to bother about connection release
if (entity != null) {
InputStream instream = entity.getContent();
try {
instream.read();
// do something useful with the response
byte[] bytes = new byte[0];
bytes = new byte[instream.available()];
instream.read(bytes);
String str = new String(bytes);
System.out.println("str: " + str);
String string = EntityUtils.toString(entity, "UTF-8");
System.out.println("string: " + string);
} catch (IOException ex) {
// In case of an IOException the connection will be released
// back to the connection manager automatically
throw ex;
} finally {
// Closing the input stream will trigger connection release
instream.close();
}
}
} finally {
response.close();
}
} finally {
httpclient.close();
}
}
- 最简单post请求
public static void main(String[] args) throws Exception {
List<NameValuePair> formparams = new ArrayList<NameValuePair>();
formparams.add(new BasicNameValuePair("account", ""));
formparams.add(new BasicNameValuePair("password", ""));
HttpEntity reqEntity = new UrlEncodedFormEntity(formparams, "UTF-8");
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(5000)// 一、连接超时：connectionTimeout-->指的是连接一个url的连接等待时间
.setSocketTimeout(5000)// 二、读取数据超时：SocketTimeout-->指的是连接上一个url，获取response的返回等待时间
.setConnectionRequestTimeout(5000).build();
HttpClient client = HttpClients.createDefault();
HttpPost post = new HttpPost("http://cnivi.com.cn/login");
post.setEntity(reqEntity);
post.setConfig(requestConfig);
HttpResponse response = client.execute(post);
if (response.getStatusLine().getStatusCode() == 200) {
HttpEntity resEntity = response.getEntity();
String message = EntityUtils.toString(resEntity, "UTF-8");
System.out.println(message);
} else {
System.out.println("请求失败");
}
}
- 解决参数乱码问题
HttpEntity entity = new StringEntity(xml, ContentType.create("text/xml", Consts.UTF_8));
