Java傳送HTTP的get，post請求(JSON)

  import net.sf.json.JSONObject;
  import org.apache.commons.httpclient.*;
  import org.apache.commons.httpclient.methods.GetMethod;
  import org.apache.commons.httpclient.params.HttpMethodParams;
  import org.apache.http.HttpEntity;
   import org.apache.http.HttpResponse;
   import org.apache.http.client.methods.HttpPost;
   import org.apache.http.entity.StringEntity;
   import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.util.EntityUtils;
  import java.io.IOException;
  
  /**
   * Created by liqun.chen on 2017/5/15.
   */
  public class HttpUtil {
      /**
       * json 字串
       * @param url
       * @param param
       * @return
       */
      public static String getSerchPersion(String url,String param){
        /* 1 生成 HttpClinet 物件並設定引數 */
          HttpClient httpClient = new HttpClient();
          // 設定 Http 連線超時為5秒
          httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
        /* 2 生成 GetMethod 物件並設定引數 */
          GetMethod getMethod = new GetMethod(url);
          // 設定 get 請求超時為 5 秒
          getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);
          // 設定請求重試處理，用的是預設的重試處理：請求三次
         getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
          String response = "";
        /* 3 執行 HTTP GET 請求 */
          try {
              int statusCode = httpClient.executeMethod(getMethod);
           /* 4 判斷訪問的狀態碼 */
              if (statusCode != HttpStatus.SC_OK) {
                  System.err.println("請求出錯: "+ getMethod.getStatusLine());
              }
           /* 5 處理 HTTP 響應內容 */
              // HTTP響應頭部資訊，這裡簡單列印
             Header[] headers = getMethod.getResponseHeaders();
              for (Header h : headers)
                  System.out.println(h.getName() + "------------ " + h.getValue());
              // 讀取 HTTP 響應內容，這裡簡單列印網頁內容
              byte[] responseBody = getMethod.getResponseBody();// 讀取為位元組陣列
              response = new String(responseBody, param);
              System.out.println("----------response:" + response);
              // 讀取為 InputStream，在網頁內容資料量大時候推薦使用
              // InputStream response = getMethod.getResponseBodyAsStream();
         } catch (HttpException e) {
              // 發生致命的異常，可能是協議不對或者返回的內容有問題
              System.out.println("請檢查輸入的URL!");
              e.printStackTrace();
          } catch (IOException e) {
              // 發生網路異常
              System.out.println("發生網路異常!");
              e.printStackTrace();
          } finally {
           /* 6 .釋放連線 */
              getMethod.releaseConnection();
          }
          return response;
      }
      /**
       * post請求
       * @param url
       * @param json
       * @return
       */
      public static JSONObject doPost(String url,JSONObject json){
          DefaultHttpClient client = new DefaultHttpClient();
          HttpPost post = new HttpPost(url);
          JSONObject response = null;
          try {
              StringEntity s = new StringEntity(json.toString());
              s.setContentEncoding("UTF-8");
              s.setContentType("application/json");//傳送json資料需要設定contentType
              post.setEntity(s);
              HttpResponse res = client.execute(post);
              if(res.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
                  HttpEntity entity = res.getEntity();
                  String result = EntityUtils.toString(res.getEntity());// 返回json格式：
                  response = JSONObject.fromObject(result);
              }
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
          return response;
      }
 

  //呼叫
  public static void main(String arg[]) throws Exception {
          String url = "http://localhost:8080/";
          JSONObject params = new JSONObject();
          params.put("personName", "name");
          params.put("personCode", "230882xxxxxx2116");
          JSONObject param2 = new JSONObject();
          param2.put("pageNo", 1);
          param2.put("pageSize", 20);
        params.put("page", param2);
         String param = "q="+params.toString();
         //get 請求
         String ret = getSerchPersion(url, param.toString());
         System.out.println(ret);
 //        JSONObject jsonResponse=JSONObject.fromObject(param);
 //        JSONObject json = (JSONObject)jsonResponse.get("page");
 //        System.out.println(json.get("pageSize"));
 
         //post 請求
         JSONObject jsonObject = doPost(url,params);
         System.out.println(jsonObject.toString());
     }