[A] HttpClient4.3.1 simple entry examples

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1, look at the sample code

public class HttpClientTest {
    public static void main(String args[]) {
        //创建HttpClientBuilder
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        //HttpClient
        CloseableHttpClient closeableHttpClient = httpClientBuilder.build();

        HttpGet httpGet = new HttpGet("http://www.gxnu.edu.cn/default.html");
        System.out.println(httpGet.getRequestLine());
        try {
            //执行get请求
            HttpResponse httpResponse = closeableHttpClient.execute(httpGet);
            //获取响应消息实体
            HttpEntity entity = httpResponse.getEntity();
            //响应状态
            System.out.println("status:" + httpResponse.getStatusLine());
            //判断响应实体是否为空
            if (entity != null) {
                System.out.println("contentEncoding:" + entity.getContentEncoding());
                System.out.println("response content:" + EntityUtils.toString(entity));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {

//关闭流并释放资源
                closeableHttpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

The following comes from HttpClient4.3.1 API documentation: http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/overview-summary.html

2、HttpClientBuilder

HttpClientBuilder used to create CloseableHttpClient instance. I looked at the API documentation, AbstractHttpClient , AutoRetryHttpClient , DefaultHttpClient so is deprecated, use HttpClientBuilder instead.  

3、CloseableHttpClient

Implement an interface: of Closeable ,  AutoCloseable ,  HttpClient ; subclasses: AbstractHttpClient

4、HttpGet

Non-thread-safe; HttpGet has three constructors: HttpGet (), HttpGet (String uri), HttpGet (URI uri)

5、HttpResponse

HTTP server returns a response message after receiving and interpreting a request

Response      = Status-Line
                     *(( general-header
                      | response-header
                      | entity-header ) CRLF)
                     CRLF
                     [ message-body ]

Reproduced in: https: //my.oschina.net/tanweijie/blog/195287