最近在使用Apache的httpclient的时候,maven引用了最新版本4.3,发现Idea提示DefaultHttpClient等常用的类已经不推荐使用了,之前在使用4.2.3版本的时候,还没有被deprecated。去看了下官方文档,确实不推荐使用了,点击此处详情。
- DefaultHttpClient —> CloseableHttpClient
- HttpResponse —> CloseableHttpResponse
官方给出了新api的样例,如下。
Get方法:
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://targethost/homepage");
CloseableHttpResponse response1 = httpclient.execute(httpGet);
// The underlying HTTP connection is still held by the response object
// to allow the response content to be streamed directly from the network socket.
// In order to ensure correct deallocation of system resources
// the user MUST either fully consume the response content or abort request
// execution by calling CloseableHttpResponse#close().
//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 {
System.out.println(response1.getStatusLine());
HttpEntity entity1 = response1.getEntity();
// do something useful with the response body
// and ensure it is fully consumed
EntityUtils.consume(entity1);
} finally {
response1.close();
}
Post方法:
HttpPost httpPost = new HttpPost("http://targethost/login");
//拼接参数
List <NameValuePair> nvps = new ArrayList <NameValuePair>();
nvps.add(new BasicNameValuePair("username", "vip"));
nvps.add(new BasicNameValuePair("password", "secret"));
httpPost.setEntity(new UrlEncodedFormEntity(nvps));
CloseableHttpResponse response2 = httpclient.execute(httpPost);
try {
System.out.println(response2.getStatusLine());
HttpEntity entity2 = response2.getEntity();
// do something useful with the response body
// and ensure it is fully consumed
//消耗掉response
EntityUtils.consume(entity2);
} finally {
response2.close();
}
再往下看HttpClients的源码,具体的实现都在HttpClientBuilder
的build
方法中,有兴趣的可以去apache看源码。
/**
* Creates {@link CloseableHttpClient} instance with default
* configuration.
*/
public static CloseableHttpClient createDefault() {
return HttpClientBuilder.create().build();
}