客戶端client發送請求

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import com.sun.tools.example.debug.expr.ParseException;
public class HttpUtil {
/**

• 模擬請求
• @param url 資源地址
• @param map 參數列表
• @param encoding 編碼
• @return
• @throws ParseException

• @throws IOException
  */
  public static String send(String url, Map<String, String> map, String encoding) throws ParseException, IOException {
  String body = "";
  // 創建httpclient對象
  CloseableHttpClient client = HttpClients.createDefault();
  // 創建post方式請求對象
  HttpPost httpPost = new HttpPost(url);
  // 裝填參數
  List<NameValuePair> nvps = new ArrayList<NameValuePair>();
  if (map != null) {
  for (Entry<String, String> entry : map.entrySet()) {
  nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
  }
  }
  // 設置參數到請求對象中
  httpPost.setEntity(new UrlEncodedFormEntity(nvps, encoding));

  System.out.println("請求地址：" + url);
  System.out.println("請求參數：" + nvps.toString());
  
  // 設置header信息
  // 指定報文頭【Content-type】、【User-Agent】
  httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
  httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
  
  // 執行請求操作，并拿到結果（同步阻塞）
  CloseableHttpResponse response = client.execute(httpPost);
  // 獲取結果實體
  HttpEntity entity = response.getEntity();
  if (entity != null) {
      // 按指定編碼轉換結果實體為String類型
      body = EntityUtils.toString(entity, encoding);
  }
  EntityUtils.consume(entity);
  // 釋放鏈接
  response.close();
  return body;

  }
  public static void main(String[] args) {
  Map<String, String> params = new HashMap<String, String>();
  params.put("call", "Order.pushOrderInfo");
  params.put("sign", "5639a9327cb6841517021a1d8c646ee9");
  params.put("args","");
  try {
  System.out.println(send("http://192.168.1.1/user/add", params, "utf-8"));
  } catch (ParseException | IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  }
  }