HttpClient 4.3与4.3版本以下版本比较-技术博客集

HttpClient 4.3与4.3版本以下版本比较
编程技术 / houtizong 发布于 3年前 420

网上利用java发送http请求的代码很多，一搜一大把，有的利用的是java.net.*下的HttpURLConnection，有的用httpclient，而且发送的代码也分门别类。今天我们主要来说的是利用httpclient发送请求。

httpclient又可分为

httpclient3.x
httpclient4.x到httpclient4.3以下
httpclient4.3以上

不同httpclient版本其请求发送的方式也不一样，下面来做个归纳

httpclient3.x

HttpClient client = new HttpClient();// 设置代理服务器地址和端口// client.getHostConfiguration().setProxy("proxy_host_addr",proxy_port);// 使用 GET 方法 ，如果服务器需要通过 HTTPS 连接，那只需要将下面 URL 中的 http 换成 httpsHttpMethodmethod = new GetMethod("http://java.sun.com");// 使用POST方法// HttpMethod method = new PostMethod("http://java.sun.com");client.executeMethod(method);// 打印服务器返回的状态System.out.println(method.getStatusLine());// 打印返回的信息System.out.println(method.getResponseBodyAsString());// 释放连接method.releaseConnection();

httpclient4.x到httpclient4.3以下

public void getUrl(String url, String encoding) throws ClientProtocolException, IOException {HttpClient client = new DefaultHttpClient();HttpGet get = new HttpGet(url);HttpResponse response = client.execute(get);HttpEntity entity = response.getEntity();if (entity != null) {InputStream instream = entity.getContent();try {BufferedReader reader = new BufferedReader(new InputStreamReader(instream, encoding));System.out.println(reader.readLine());} catch (Exception e) {e.printStackTrace();} finally {instream.close();}}// 关闭连接.client.getConnectionManager().shutdown();}

httpclient4.3以上

import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public static String getResult(String urlStr) {CloseableHttpClient httpClient = HttpClients.createDefault();// HTTP Get请求HttpGet httpGet = new HttpGet(urlStr);// 设置请求和传输超时时间// RequestConfig requestConfig =// RequestConfig.custom().setSocketTimeout(TIME_OUT).setConnectTimeout(TIME_OUT).build();// httpGet.setConfig(requestConfig);String res = "";try {// 执行请求HttpResponse getAddrResp = httpClient.execute(httpGet);HttpEntity entity = getAddrResp.getEntity();if (entity != null) {res = EntityUtils.toString(entity);}log.info("响应" + getAddrResp.getStatusLine());} catch (Exception e) {log.error(e.getMessage(), e);return res;} finally {try {httpClient.close();} catch (IOException e) {log.error(e.getMessage(), e);return res;}}return res;}

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<div  >  <p>网上利用java发送http请求的代码很多，一搜一大把，有的利用的是java.net.*下的HttpURLConnection，有的用httpclient，而且发送的代码也分门别类。今天我们主要来说的是利用httpclient发送请求。</p>  <p>httpclient又可分为</p>  <ul>   <li>httpclient3.x</li>   <li>httpclient4.x到httpclient4.3以下</li>   <li>httpclient4.3以上</li>  </ul>  <p>不同httpclient版本其请求发送的方式也不一样，下面来做个归纳</p>  <p>&nbsp;</p>  <h2>httpclient3.x</h2>  <pre class="java" name="code">HttpClient client = new HttpClient();// 设置代理服务器地址和端口// client.getHostConfiguration().setProxy(&quot;proxy_host_addr&quot;,proxy_port);// 使用 GET 方法 ，如果服务器需要通过 HTTPS 连接，那只需要将下面 URL 中的 http 换成 httpsHttpMethodmethod = new GetMethod(&quot;http://java.sun.com&quot;);// 使用POST方法// HttpMethod method = new PostMethod(&quot;http://java.sun.com&quot;);client.executeMethod(method);// 打印服务器返回的状态System.out.println(method.getStatusLine());// 打印返回的信息System.out.println(method.getResponseBodyAsString());// 释放连接method.releaseConnection();</pre>  <p>&nbsp;</p>  <h2>&nbsp;</h2>  <h2>httpclient4.x到httpclient4.3以下</h2>  <p>&nbsp;</p>  <pre class="java" name="code">public void getUrl(String url, String encoding) throws ClientProtocolException, IOException {HttpClient client = new DefaultHttpClient();HttpGet get = new HttpGet(url);HttpResponse response = client.execute(get);HttpEntity entity = response.getEntity();if (entity != null) {InputStream instream = entity.getContent();try {BufferedReader reader = new BufferedReader(new InputStreamReader(instream, encoding));System.out.println(reader.readLine());} catch (Exception e) {e.printStackTrace();} finally {instream.close();}}// 关闭连接.client.getConnectionManager().shutdown();}</pre>  <p>&nbsp;</p>  <p>&nbsp;</p>  <p>&nbsp;</p>  <h2>httpclient4.3以上</h2>  <p>&nbsp;</p>  <pre class="java" name="code">import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public static String getResult(String urlStr) {CloseableHttpClient httpClient = HttpClients.createDefault();// HTTP Get请求HttpGet httpGet = new HttpGet(urlStr);// 设置请求和传输超时时间// RequestConfig requestConfig =// RequestConfig.custom().setSocketTimeout(TIME_OUT).setConnectTimeout(TIME_OUT).build();// httpGet.setConfig(requestConfig);String res = &quot;&quot;;try {// 执行请求HttpResponse getAddrResp = httpClient.execute(httpGet);HttpEntity entity = getAddrResp.getEntity();if (entity != null) {res = EntityUtils.toString(entity);}log.info(&quot;响应&quot; + getAddrResp.getStatusLine());} catch (Exception e) {log.error(e.getMessage(), e);return res;} finally {try {httpClient.close();} catch (IOException e) {log.error(e.getMessage(), e);return res;}}return res;}</pre>  <p>&nbsp;</p>  <p>&nbsp;</p> </div>

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