发送HTTP请求 -- HttpUtil

1.

 package com.step.utils;

 import java.io.IOException;
 import java.net.URLDecoder;
 import java.util.ArrayList;
 import java.util.List;

 import org.apache.http.HttpResponse;
 import org.apache.http.HttpStatus;
 import org.apache.http.NameValuePair;
 import org.apache.http.client.ClientProtocolException;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.entity.UrlEncodedFormEntity;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.message.BasicNameValuePair;
 import org.apache.http.util.EntityUtils;

 import com.alibaba.fastjson.JSONObject;

 /**
  * 发送HTTP请求
  * @author mlu
  *
  */
 public class HttpUtils {

     /**
      * 发送post请求--用于接口接收的参数为JSON字符串
      * @param url 请求地址
      * @param params json格式的字符串
      * @return
      */
     public static String httpPost(String url, String params){
         String result = null;
         try {
             HttpClient httpClient = new DefaultHttpClient();
             HttpPost httpPost = new HttpPost(url);
             /*
              * 发送json字符串，这两句需要设置
              */
             httpPost.addHeader("Content-type","application/json; charset=utf-8");
             httpPost.setHeader("Accept", "application/json");  

             httpPost.setEntity(new StringEntity(params, "UTF-8"));

             HttpResponse response = httpClient.execute(httpPost);  

             int statusCode = response.getStatusLine().getStatusCode();  

             if (statusCode == HttpStatus.SC_OK) {
                 // Read the response body
                 result = EntityUtils.toString(response.getEntity(),"UTF-8");
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         return result;
     }

     /**
      * 发送post请求--用于接口接收的参数为键值对
      * @param url 请求地址
      * @param nameValuePairs 键值对
      * @return
      */
     public static String httpPost(String url, List<NameValuePair> nameValuePairs) {
         HttpClient httpClient = new DefaultHttpClient();
         HttpPost httpPost = new HttpPost(url);
         String strResult = "";

         try {
             httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
             HttpResponse response = httpClient.execute(httpPost);

             if (response.getStatusLine().getStatusCode() == 200) {
                 /* 读返回数据 */
                 strResult = EntityUtils.toString(response.getEntity());
                 // System.out.println("conResult:"+conResult);
             } else {
                 strResult += "发送失败:" + response.getStatusLine().getStatusCode();
             }
         } catch (ClientProtocolException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

         return strResult;
     }

     public static String httpGet(String url, List<NameValuePair> nameValuePairs){
         HttpClient httpClient = new DefaultHttpClient();
         String sb = "";
         String result = "";
         try {
             for(NameValuePair nvp:nameValuePairs){
                 sb += nvp.getName()+"="+nvp.getValue()+"&";
             }
             sb = sb.substring(0,sb.length()-1);
             sb = URLDecoder.decode(sb, "UTF-8");
             HttpGet httpGet = new HttpGet(url+"?"+sb);

             HttpResponse response = httpClient.execute(httpGet);
             if (response.getStatusLine().getStatusCode() == 200) {
                 /* 读返回数据 */
                 result = EntityUtils.toString(response.getEntity());
             } else {
                 result += "发送失败:" + response.getStatusLine().getStatusCode();
             }

         } catch (ClientProtocolException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
         return result;
     }

     public static void main(String[] args) {
         String url = "http://10.140.8.56/gd_fssc/rest/fsscService/getStaffInfo";
         String url2 = "http://localhost:8080/eshore-app-backframe-web/interface/getJson";

         // 发送 POST 请求
         JSONObject json = new JSONObject();
         json.put("number", "44053211@GD");
         httpPost(url,json.toString());

         List<NameValuePair> nameValuePairs = new ArrayList<>();
         nameValuePairs.add(new BasicNameValuePair("method", "login"));
         httpGet(url2,nameValuePairs);
     }
 }

引用的jar包：