JAVA利用HttpClient進行POST和GET請求（HTTPS）__javaSE

目前，要為另一個項目提供介面，介面是用HTTP URL實現的，最初的想法是另一個項目用JQuery post進行請求。

但是，很可能另一個項目是部署在別的機器上，那麼就存在跨域問題，而JQuery的post請求是不允許跨域的。

這時，就只能夠用HttpClient包進行請求了，同時由於請求的URL是HTTPS的，為了避免需要認證，所以用一個類繼承DefaultHttpClient類，忽略校正過程。

1.寫一個SSLClient類，繼承至HttpClient

import java.security.cert.CertificateException;  import java.security.cert.X509Certificate;  import javax.net.ssl.SSLContext;  import javax.net.ssl.TrustManager;  import javax.net.ssl.X509TrustManager;  import org.apache.http.conn.ClientConnectionManager;  import org.apache.http.conn.scheme.Scheme;  import org.apache.http.conn.scheme.SchemeRegistry;  import org.apache.http.conn.ssl.SSLSocketFactory;  import org.apache.http.impl.client.DefaultHttpClient;  //用於進行Https請求的HttpClient  public class SSLClient extends DefaultHttpClient{      public SSLClient() throws Exception{          super();          SSLContext ctx = SSLContext.getInstance("TLS");          X509TrustManager tm = new X509TrustManager() {                  @Override                  public void checkClientTrusted(X509Certificate[] chain,                          String authType) throws CertificateException {                  }                  @Override                  public void checkServerTrusted(X509Certificate[] chain,                          String authType) throws CertificateException {                  }                  @Override                  public X509Certificate[] getAcceptedIssuers() {                      return null;                  }          };          ctx.init(null, new TrustManager[]{tm}, null);          SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);          ClientConnectionManager ccm = this.getConnectionManager();          SchemeRegistry sr = ccm.getSchemeRegistry();          sr.register(new Scheme("https", 443, ssf));      }  }  

2.寫一個利用HttpClient發送post請求的類

import java.util.ArrayList;  import java.util.Iterator;  import java.util.List;  import java.util.Map;  import java.util.Map.Entry;  import org.apache.http.HttpEntity;  import org.apache.http.HttpResponse;  import org.apache.http.NameValuePair;  import org.apache.http.client.HttpClient;  import org.apache.http.client.entity.UrlEncodedFormEntity;  import org.apache.http.client.methods.HttpPost;  import org.apache.http.message.BasicNameValuePair;  import org.apache.http.util.EntityUtils;  /*  * 利用HttpClient進行post請求的工具類  */  public class HttpClientUtil {      public String doPost(String url,Map<String,String> map,String charset){          HttpClient httpClient = null;          HttpPost httpPost = null;          String result = null;          try{              httpClient = new SSLClient();              httpPost = new HttpPost(url);              //設定參數              List<NameValuePair> list = new ArrayList<NameValuePair>();              Iterator iterator = map.entrySet().iterator();              while(iterator.hasNext()){                  Entry<String,String> elem = (Entry<String, String>) iterator.next();                  list.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));              }              if(list.size() > 0){                  UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);                  httpPost.setEntity(entity);              }              HttpResponse response = httpClient.execute(httpPost);              if(response != null){                  HttpEntity resEntity = response.getEntity();                  if(resEntity != null){                      result = EntityUtils.toString(resEntity,charset);                  }              }          }catch(Exception ex){              ex.printStackTrace();          }          return result;      }  }  

3.調用post請求的測試代碼

import java.util.HashMap;  import java.util.Map;  //對介面進行測試  public class TestMain {      private String url = "https://192.168.1.101/";      private String charset = "utf-8";      private HttpClientUtil httpClientUtil = null;            public TestMain(){          httpClientUtil = new HttpClientUtil();      }            public void test(){          String httpOrgCreateTest = url + "httpOrg/create";          Map<String,String> createMap = new HashMap<String,String>();          createMap.put("authuser","*****");          createMap.put("authpass","*****");          createMap.put("orgkey","****");          createMap.put("orgname","****");          String httpOrgCreateTestRtn = httpClientUtil.doPost(httpOrgCreateTest,createMap,charset);          System.out.println("result:"+httpOrgCreateTestRtn);      }            public static void main(String[] args){          TestMain main = new TestMain();          main.test();      }  }  

4.GET的請求方式

/** * 發送get請求 * @param url       連結地址 * @param charset   字元編碼，若為null則預設utf-8 * @return */public String doGet(String url,String charset){if(null == charset){charset = "utf-8";}HttpClient httpClient = null;HttpGet httpGet= null;String result = null;try {httpClient = new SSLClient();httpGet = new HttpGet(url);HttpResponse response = httpClient.execute(httpGet);if(response != null){HttpEntity resEntity = response.getEntity();if(resEntity != null){result = EntityUtils.toString(resEntity,charset);}}} catch (Exception e) {e.printStackTrace();}return result;}

httpClient4.2的jar包下載路徑：http://download.csdn.net/detail/hqmryang/4582440#comment