JAVA HTTP请求和HTTPS请求

HTTP与HTTPS区别：http://blog.csdn.net/lyhjava/article/details/51860215

URL发送 HTTP、HTTPS:http://blog.csdn.net/guozili1/article/details/53995121

HttpClient 发送 HTTP、HTTPS 请求的简单封装

http://blog.csdn.net/happylee6688/article/details/47148227

 <span style="font-family:Comic Sans MS;">import org.apache.commons.io.IOUtils;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.HttpStatus;
 import org.apache.http.NameValuePair;
 import org.apache.http.client.HttpClient;
 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.conn.ssl.SSLConnectionSocketFactory;
 import org.apache.http.conn.ssl.SSLContextBuilder;
 import org.apache.http.conn.ssl.TrustStrategy;
 import org.apache.http.conn.ssl.X509HostnameVerifier;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.impl.client.HttpClients;
 import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 import org.apache.http.message.BasicNameValuePair;
 import org.apache.http.util.EntityUtils;

 import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLException;
 import javax.net.ssl.SSLSession;
 import javax.net.ssl.SSLSocket;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.Charset;
 import java.security.GeneralSecurityException;
 import java.security.cert.CertificateException;
 import java.security.cert.X509Certificate;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 /**
  * HTTP 请求工具类
  *
  * @author : liii
  * @version : 1.0.
  * @date : //
  * @see : TODO
  */
 public class HttpUtil {
     private static PoolingHttpClientConnectionManager connMgr;
     private static RequestConfig requestConfig;
     private static final int MAX_TIMEOUT = ;

     static {
         // 设置连接池
         connMgr = new PoolingHttpClientConnectionManager();
         // 设置连接池大小
         connMgr.setMaxTotal();
         connMgr.setDefaultMaxPerRoute(connMgr.getMaxTotal());

         RequestConfig.Builder configBuilder = RequestConfig.custom();
         // 设置连接超时
         configBuilder.setConnectTimeout(MAX_TIMEOUT);
         // 设置读取超时
         configBuilder.setSocketTimeout(MAX_TIMEOUT);
         // 设置从连接池获取连接实例的超时
         configBuilder.setConnectionRequestTimeout(MAX_TIMEOUT);
         // 在提交请求之前 测试连接是否可用
         configBuilder.setStaleConnectionCheckEnabled(true);
         requestConfig = configBuilder.build();
     }

     /**
      * 发送 GET 请求（HTTP），不带输入数据
      * @param url
      * @return
      */
     public static String doGet(String url) {
         return doGet(url, new HashMap<String, Object>());
     }

     /**
      * 发送 GET 请求（HTTP），K-V形式
      * @param url
      * @param params
      * @return
      */
     public static String doGet(String url, Map<String, Object> params) {
         String apiUrl = url;
         StringBuffer param = new StringBuffer();
         int i = ;
         for (String key : params.keySet()) {
             if (i == )
                 param.append("?");
             else
                 param.append("&");
             param.append(key).append("=").append(params.get(key));
             i++;
         }
         apiUrl += param;
         String result = null;
         HttpClient httpclient = new DefaultHttpClient();
         try {
             HttpGet httpPost = new HttpGet(apiUrl);
             HttpResponse response = httpclient.execute(httpPost);
             int statusCode = response.getStatusLine().getStatusCode();

             System.out.println("执行状态码 : " + statusCode);

             HttpEntity entity = response.getEntity();
             if (entity != null) {
                 InputStream instream = entity.getContent();
                 result = IOUtils.toString(instream, "UTF-8");
             }
         } catch (IOException e) {
             e.printStackTrace();
         }
         return result;
     }

     /**
      * 发送 POST 请求（HTTP），不带输入数据
      * @param apiUrl
      * @return
      */
     public static String doPost(String apiUrl) {
         return doPost(apiUrl, new HashMap<String, Object>());
     }

     /**
      * 发送 POST 请求（HTTP），K-V形式
      * @param apiUrl API接口URL
      * @param params 参数map
      * @return
      */
     public static String doPost(String apiUrl, Map<String, Object> params) {
         CloseableHttpClient httpClient = HttpClients.createDefault();
         String httpStr = null;
         HttpPost httpPost = new HttpPost(apiUrl);
         CloseableHttpResponse response = null;

         try {
             httpPost.setConfig(requestConfig);
             List<NameValuePair> pairList = new ArrayList<>(params.size());
             for (Map.Entry<String, Object> entry : params.entrySet()) {
                 NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry
                         .getValue().toString());
                 pairList.add(pair);
             }
             httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("UTF-8")));
             response = httpClient.execute(httpPost);
             System.out.println(response.toString());
             HttpEntity entity = response.getEntity();
             httpStr = EntityUtils.toString(entity, "UTF-8");
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             if (response != null) {
                 try {
                     EntityUtils.consume(response.getEntity());
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
         return httpStr;
     }

     /**
      * 发送 POST 请求（HTTP），JSON形式
      * @param apiUrl
      * @param json json对象
      * @return
      */
     public static String doPost(String apiUrl, Object json) {
         CloseableHttpClient httpClient = HttpClients.createDefault();
         String httpStr = null;
         HttpPost httpPost = new HttpPost(apiUrl);
         CloseableHttpResponse response = null;

         try {
             httpPost.setConfig(requestConfig);
             StringEntity stringEntity = new StringEntity(json.toString(),"UTF-8");//解决中文乱码问题
             stringEntity.setContentEncoding("UTF-8");
             stringEntity.setContentType("application/json");
             httpPost.setEntity(stringEntity);
             response = httpClient.execute(httpPost);
             HttpEntity entity = response.getEntity();
             System.out.println(response.getStatusLine().getStatusCode());
             httpStr = EntityUtils.toString(entity, "UTF-8");
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             if (response != null) {
                 try {
                     EntityUtils.consume(response.getEntity());
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
         return httpStr;
     }

     /**
      * 发送 SSL POST 请求（HTTPS），K-V形式
      * @param apiUrl API接口URL
      * @param params 参数map
      * @return
      */
     public static String doPostSSL(String apiUrl, Map<String, Object> params) {
         CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory()).setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build();
         HttpPost httpPost = new HttpPost(apiUrl);
         CloseableHttpResponse response = null;
         String httpStr = null;

         try {
             httpPost.setConfig(requestConfig);
             List<NameValuePair> pairList = new ArrayList<NameValuePair>(params.size());
             for (Map.Entry<String, Object> entry : params.entrySet()) {
                 NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry
                         .getValue().toString());
                 pairList.add(pair);
             }
             httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("utf-8")));
             response = httpClient.execute(httpPost);
             int statusCode = response.getStatusLine().getStatusCode();
             if (statusCode != HttpStatus.SC_OK) {
                 return null;
             }
             HttpEntity entity = response.getEntity();
             if (entity == null) {
                 return null;
             }
             httpStr = EntityUtils.toString(entity, "utf-8");
         } catch (Exception e) {
             e.printStackTrace();
         } finally {
             if (response != null) {
                 try {
                     EntityUtils.consume(response.getEntity());
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
         return httpStr;
     }

     /**
      * 发送 SSL POST 请求（HTTPS），JSON形式
      * @param apiUrl API接口URL
      * @param json JSON对象
      * @return
      */
     public static String doPostSSL(String apiUrl, Object json) {
         CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory()).setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build();
         HttpPost httpPost = new HttpPost(apiUrl);
         CloseableHttpResponse response = null;
         String httpStr = null;

         try {
             httpPost.setConfig(requestConfig);
             StringEntity stringEntity = new StringEntity(json.toString(),"UTF-8");//解决中文乱码问题
             stringEntity.setContentEncoding("UTF-8");
             stringEntity.setContentType("application/json");
             httpPost.setEntity(stringEntity);
             response = httpClient.execute(httpPost);
             int statusCode = response.getStatusLine().getStatusCode();
             if (statusCode != HttpStatus.SC_OK) {
                 return null;
             }
             HttpEntity entity = response.getEntity();
             if (entity == null) {
                 return null;
             }
             httpStr = EntityUtils.toString(entity, "utf-8");
         } catch (Exception e) {
             e.printStackTrace();
         } finally {
             if (response != null) {
                 try {
                     EntityUtils.consume(response.getEntity());
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
         return httpStr;
     }

     /**
      * 创建SSL安全连接
      *
      * @return
      */
     private static SSLConnectionSocketFactory createSSLConnSocketFactory() {
         SSLConnectionSocketFactory sslsf = null;
         try {
             SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {

                 public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {
                     return true;
                 }
             }).build();
             sslsf = new SSLConnectionSocketFactory(sslContext, new X509HostnameVerifier() {

                 @Override
                 public boolean verify(String arg0, SSLSession arg1) {
                     return true;
                 }

                 @Override
                 public void verify(String host, SSLSocket ssl) throws IOException {
                 }

                 @Override
                 public void verify(String host, X509Certificate cert) throws SSLException {
                 }

                 @Override
                 public void verify(String host, String[] cns, String[] subjectAlts) throws SSLException {
                 }
             });
         } catch (GeneralSecurityException e) {
             e.printStackTrace();
         }
         return sslsf;
     }

     /**
      * 测试方法
      * @param args
      */
     public static void main(String[] args) throws Exception {

     }
 }</span>

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