HttpClient 4.3学习笔记

package demo.httpclient;    import java.io.BufferedReader;  import java.io.IOException;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.util.ArrayList;  import java.util.List;    import org.apache.http.HeaderIterator;  import org.apache.http.HttpEntity;  import org.apache.http.HttpStatus;  import org.apache.http.NameValuePair;  import org.apache.http.client.ClientProtocolException;  import org.apache.http.client.config.CookieSpecs;  import org.apache.http.client.config.RequestConfig;  import org.apache.http.client.entity.UrlEncodedFormEntity;  import org.apache.http.client.methods.CloseableHttpResponse;  import org.apache.http.client.methods.HttpGet;  import org.apache.http.client.methods.HttpPost;  import org.apache.http.impl.client.CloseableHttpClient;  import org.apache.http.impl.client.HttpClients;  import org.apache.http.message.BasicNameValuePair;  import org.apache.http.util.EntityUtils;    public class HttpClientDemo {      public static void main(String[] args) {    CloseableHttpClient httpclient = HttpClients.createDefault();   HttpGet httpget = new HttpGet("http://www.soso.com");   CloseableHttpResponse response = null;       // 设置请求和传输超时时间5s,设置cookie策略   RequestConfig requestconfig = RequestConfig.custom().setSocketTimeout(5000)       .setConnectTimeout(5000).setCookieSpec(CookieSpecs.BEST_MATCH).build();   httpget.setConfig(requestconfig);       System.out.println(httpget.getURI());   // 打印请求信息   System.out.println("Executing request " + httpget.getRequestLine());   System.out.println("------------------------------");       try {       response = httpclient.execute(httpget);                   System.out.println(response.getStatusLine().toString());              System.out.println("------------------------------");            // 头信息       HeaderIterator it = response.headerIterator();       while(it.hasNext()) {           System.out.println(it.next());       }       System.out.println("------------------------------");            // 判断访问的状态码       int statusCode = response.getStatusLine().getStatusCode();       if(statusCode != HttpStatus.SC_OK) {           System.err.println("Method failed: " + response.getStatusLine());       }  //     if(statusCode == HttpStatus.SC_OK) {  //    //     } else if((statusCode == HttpStatus.SC_MOVED_TEMPORARILY)   //                  || (statusCode == HttpStatus.SC_MOVED_PERMANENTLY)   //                  || (statusCode == HttpStatus.SC_SEE_OTHER)  //                  || (statusCode == HttpStatus.SC_TEMPORARY_REDIRECT)) {  //         //页面重定向代码  //     }            HttpEntity entity = response.getEntity();       StringBuilder pageBuffer = new StringBuilder();       if(entity != null) {    InputStream in = entity.getContent();    BufferedReader br = new BufferedReader(new InputStreamReader(in, "utf-8"));    String line;    while((line = br.readLine()) != null) {        pageBuffer.append(line);        pageBuffer.append("\n");    }    System.out.println(pageBuffer.toString());    in.close();    br.close();       }            System.out.println("------------------------------");            HttpPost httpPost = new HttpPost("http://www.weibo.com");            // 将要POST的数据封包       List<NameValuePair> nvps = new ArrayList<NameValuePair>();       nvps.add(new BasicNameValuePair("username", "vip"));       nvps.add(new BasicNameValuePair("password", "123456"));       httpPost.setEntity(new UrlEncodedFormEntity(nvps, "utf-8"));              CloseableHttpResponse response1 = httpclient.execute(httpPost);       try {           HttpEntity entity1 = response1.getEntity();           if(entity != null) {               System.out.println(EntityUtils.toString(entity1,"UTF-8"));    }           EntityUtils.consume(entity1);       } finally {           response.close();       }        } catch(ClientProtocolException e) {       e.printStackTrace();   } catch(IOException e) {       e.printStackTrace();   } finally {       try {           response.close();           httpclient.close();       } catch(IOException e) {           e.printStackTrace();       }          }      }  }