一.https忽略證書

/**
 * 用於進行Https請求的HttpClient
 * 
 * @author joey
 *
 */
public class SSLClient {
    public static CloseableHttpClient createSSLClientDefault(){
        try {
            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {
                //信任所有
                public
 
 boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {
                    return true;
                }
            }).build();
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext);
            return HttpClients.custom().setSSLSocketFactory(sslsf).build();
        } 
 
catch (KeyManagementException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        }
        return  HttpClients.createDefault();
    }

}

二.post與get請求

/**
 

 * 利用HttpClient的工具類
 * 
 * @author Joey
 *
 */
public class HttpClientUtil {
    
    private static String charSet = "UTF-8";
    private static CloseableHttpClient httpClient = null;
    private static CloseableHttpResponse response = null;
    
    /**
     * https的post請求
     * @param url
     * @param jsonstr
     * @param charset
     * @return
     */
    public static String doHttpsPost(String url, String jsonStr) {
        try {
            httpClient = SSLClient.createSSLClientDefault();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader("Content-Type", "application/json");
            
            StringEntity se = new StringEntity(jsonStr);
            se.setContentType("text/json");
            se.setContentEncoding(new BasicHeader("Content-Type", "application/json"));
            httpPost.setEntity(se);
            
            response = httpClient.execute(httpPost);
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    return EntityUtils.toString(resEntity, charSet);
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }finally {
             if(httpClient != null){
                    try {
                        httpClient.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if(response != null){
                    try {
                        response.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
        }
        return null;
    }
    
    /**
     * http的post請求(用於key-value格式的參數) 
     * @param url
     * @param param
     * @return
     */
    public static String doHttpPost(String url,Map<String,String> param){
        try {
            //請求發起客戶端
            httpClient = HttpClients.createDefault();
            //參數集合
            List<NameValuePair> postParams = new ArrayList<NameValuePair>();
            //遍歷參數並添加到集合
            for(Map.Entry<String, String> entry:param.entrySet()){
                postParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
            
            //通過post方式訪問
            HttpPost post = new HttpPost(url);
            HttpEntity paramEntity = new UrlEncodedFormEntity(postParams,charSet);
            post.setEntity(paramEntity);
            response = httpClient.execute(post);
            StatusLine status = response.getStatusLine();  
            int state = status.getStatusCode();  
            if (state == HttpStatus.SC_OK) {  
                HttpEntity valueEntity = response.getEntity();
                String content = EntityUtils.toString(valueEntity);
                //jsonObject = JSONObject.fromObject(content);
                return content;
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            if(httpClient != null){
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(response != null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
    
     /** 
     * http的post請求（用於請求json格式的參數） 
     * @param url 
     * @param params 
     * @return 
     */  
    public static String doHttpPost(String url, String jsonStr) {  
        try {
            httpClient = HttpClients.createDefault();
          
            // 創建httpPost
            HttpPost httpPost = new HttpPost(url);     
            httpPost.setHeader("Accept", "application/json");   
              
            StringEntity entity = new StringEntity(jsonStr, charSet);  
            entity.setContentType("text/json");
            entity.setContentEncoding(new BasicHeader("Content-Type", "application/json"));
            httpPost.setEntity(entity);          
            //發送post請求
            response = httpClient.execute(httpPost);  
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {  
                HttpEntity responseEntity = response.getEntity();  
                String jsonString = EntityUtils.toString(responseEntity);  
                return jsonString;  
            }
        }catch(Exception e) {
              e.printStackTrace();
        }finally {
            if(httpClient != null){
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(response != null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }  
        return null;  
    }  
    
    /**
     * http的Get請求
     * @param url
     * @param param
     * @return
     */
    public static String doHttpGet(String url,Map<String,String> param) {
        CloseableHttpClient httpclient = null;
        CloseableHttpResponse response = null;
        
        try {
            httpclient = HttpClients.createDefault();
            if(param != null && !param.isEmpty()) {
                //參數集合
                List<NameValuePair> getParams = new ArrayList<NameValuePair>();
                for(Map.Entry<String, String> entry:param.entrySet()){
                    getParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
                }
                url +="?"+EntityUtils.toString(new UrlEncodedFormEntity(getParams), "UTF-8");
            }
            //發送gey請求
            HttpGet httpGet = new HttpGet(url);  
            response = httpclient.execute(httpGet);  
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {  
                return EntityUtils.toString(response.getEntity());  
            } 
        }catch(Exception e) {
            e.printStackTrace();
        }finally{
            if(httpclient != null){
                try {
                    httpclient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(response != null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
    
}

封裝HttpClient進行http請求與https請求