Experience and experience about using httpclient

1. Download the corresponding Jar package:

<!-- httpClient component-->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.3</version>
        </dependency>

        <!-- Jsoup component-->
        <dependency>
            <!-- jsoup HTML parser library @ http://jsoup.org/ -->
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.10.2</version>
        </dependency>

2. Create an instance of httpclient:

	   // Create an instance of httpclient
		   HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
CloseableHttpClient httpclient = httpClientBuilder.build();

3. Call the get, post method:

HttpGet httpGet = new HttpGet(String url);
HttpPost httpPost=new HttpPost(String url);

4. Create a return object:

CloseableHttpResponse response = null;

5. Use this returned object to receive the request for execution:

response = httpclient.execute(httpGet);

need try-catch;

6. Content of the consuming entity:

HttpEntity entity = response.getEntity();

String html = EntityUtils.toString(entity, "utf-8");

7. The output can get the web content we want

8. Use a proxy:

HttpHost proxy = new HttpHost(String host, int port);

Builder globalConfig = RequestConfig.custom();
globalConfig.setConnectTimeout(10000);// Set the longest connection time
		globalConfig.setSocketTimeout(30000);// Set the read time
httpGet.setConfig(globalConfig.setProxy(proxy).build());

9. Proxy ip using account and password:

CredentialsProvider credsProvider = null;
 credsProvider = new BasicCredentialsProvider();
    credsProvider.setCredentials(AuthScope.ANY,
        new UsernamePasswordCredentials("username", "password"));