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java使用HttpClient

HttpClient常用的包有两个

org.apache.http.client以及org.apache.commons.httpclient

我常用的是org.apache.http.client。

HttpClient在4.3版本以后声明HttpClient的方法和以前略有区别，不再是直接声明new DefaultHttpClient() .

参考下文：

new DefaultHttpClient过时处理建议和HTTP调用后关闭流处理

HttpClient 4.5.2版本设置连接超时时间-CloseableHttpClient设置Timeout

JAVA发送HttpClient请求及接收请求结果过程

HttpClient使用详解

代码如下：

    public static void sendHttpAudit(OAApplicationModule am, String type, 
                                   String entityMappingId, String param) {
        System.out.println(System.currentTimeMillis());

        String oaRestfulServiceUrl = null;
//        am.getOADBTransaction().getProfile("");
          oaRestfulServiceUrl =  "http://xxx.xxx.xxx.xxx:8090/api/Service/submitXXX";
          
//        RequestConfig requestConfig = 
//            RequestConfig.custom().setConnectTimeout(5000).setConnectionRequestTimeout(1000).setSocketTimeout(5000).build();
        RequestConfig requestConfig = 
            RequestConfig.custom().setConnectTimeout(5000).setConnectionRequestTimeout(1000).build();   
        CloseableHttpClient httpclient = null;
         
        CloseableHttpResponse h_response = null;
        
        try {
            httpclient =   HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).build();
//            httpclient = HttpClientBuilder.create().build();
            
            HttpPost postMethod = new HttpPost(oaRestfulServiceUrl);
//            postMethod.setConfig(requestConfig);
            postMethod.setHeader("User-Agent", 
                                 "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36");
            postMethod.setHeader("Referer", oaRestfulServiceUrl);
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            //200_ifaceCode 200表示为EBS系统调用RESTFUL服务。
            params.add(new BasicNameValuePair("type",  type));            
            params.add(new BasicNameValuePair("param", param));
            //添加参数
            postMethod.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
            h_response = httpclient.execute(postMethod);
            HttpEntity repEntity = h_response.getEntity();

            int statusCode = h_response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                postMethod.abort();
                procProcessError(am, entityMappingId, String.valueOf(statusCode), EntityUtils.toString(repEntity, "UTF-8") );
                throw new OAException("HttpClient,error status code :" + 
                                      statusCode);
            }
            String content = EntityUtils.toString(repEntity, "UTF-8");
            System.out.println(content);
            JSONObject json = JSON.parseObject(content);
            String retCode = json.getString("returnCode");
            String retMsg   = json.getString("returnMsg");
            procProcessError(am, entityMappingId, retCode, retMsg );
            if (!"000000".equals(retCode)) {
                System.out.println("  error  " +retMsg );
                throw new OAException("接口服务处理异常" + 
                                      json.getString("returnMsg"));
            } else {
                changeStatusInprocess(am, entityMappingId);
            }
        } catch (ConnectTimeoutException e) {
            procProcessError(am, entityMappingId, "ConnectTimeoutException", e.getMessage() );
        
            System.out.println(" ConnectTimeoutException " + 
                               System.currentTimeMillis());
            e.printStackTrace();
            throw new OAException("接口服务处理异常 ConnectTimeoutException " + 
                                  e.getMessage());
        } catch (SocketTimeoutException e) {
            procProcessError(am, entityMappingId, "SocketTimeoutException", e.getMessage() );
            System.out.println(" SocketTimeoutException " + 
                               System.currentTimeMillis());
            e.printStackTrace();
            throw new OAException("接口服务处理异常 SocketTimeoutException " + 
                                  e.getMessage());
        } catch (Exception e) {
            procProcessError(am, entityMappingId, "Exception", e.getMessage() );
            System.out.println("Exception " + System.currentTimeMillis());
            e.printStackTrace();
            throw new OAException("接口服务处理异常 Exception " + e.getMessage());
        } finally {
            if (h_response != null) {
                try {
                    h_response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (httpclient != null) {
                try {
                    httpclient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }