java 用http远程请求另外一个服务器，并接收返回回来的json数据

https://cngolon.iteye.com/blog/1571188

https://blog.csdn.net/buyaopingbixiazai/article/details/80680009

   SimpleHttpClient httclient = new SimpleHttpClient();
   Map<String, String> headers = new HashMap<String, String>();

=============================================================================================================================
String pwdTempSerCode = Base64Utils.encode(serviceSecret);
String pwdTempRandCode = Base64Utils.encode(phoneCode);
headers.put("Accept","text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01");
headers.put("Accept-Encoding", "gzip, deflate, br");			
headers.put("Accept-Language", "zh-CN,zh;q=0.9");
headers.put("Connection", "Keep-Alive");
headers.put("Content-Type", "*");
headers.put("Cookie", buffer.toString());
headers.put("Host", "shop.10086.cn");
headers.put("Referer", "https://shop.10086.cn/i/?f=billdetailqry&welcome=" + System.currentTimeMillis());
headers.put("User-Agent","Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.75 Safari/537.36");
headers.put("x-requested-with", "XMLHttpRequest");
// 开始发包
String rest = httclient.get("https://shop.10086.cn/i/v1/fee/detailbilltempidentjsonp/" + userNumber
		+ "?callback=jQuery031587062895804485_" + System.currentTimeMillis() + "&pwdTempSerCode="
		+ pwdTempSerCode + "&pwdTempRandCode=" + pwdTempRandCode + "&captchaVal=" + catpy + "&_="
		+ System.currentTimeMillis(), headers);

这里我们写了一个通用工具类，喜欢的可以自己研究

package com.fjdata.util;


import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.CookieStore;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.cookie.Cookie;
import org.apache.http.impl.client.BasicCookieStore;
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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * 
 * @author 朱洪郑
 * 通用请求类
 * 
 *
 */
public class SimpleHttpClient {
	private static Logger logger = LoggerFactory.getLogger(SimpleHttpClient.class);
    private static CloseableHttpClient httpClient;
    private static CookieStore cookieStore;

    static {
        cookieStore  = new BasicCookieStore();

        // 将CookieStore设置到httpClient中
        httpClient = HttpClients.custom().setDefaultCookieStore(cookieStore).build();
    }
    
    public static String getCookie(String name){
        List<Cookie> cookies =  cookieStore.getCookies();
        System.out.println(cookies);
        for(Cookie cookie : cookies){
            if(cookie.getName().equalsIgnoreCase(name)){
                return cookie.getValue();
            }
        }
        return null;
        
    }

    /**
     * GET 请求
     * @param url
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static String get(String url) throws ClientProtocolException, IOException {
        HttpGet httpGet = new HttpGet(url);
        HttpResponse httpResponse = httpClient.execute(httpGet);
        return EntityUtils.toString(httpResponse.getEntity());
    }
    
    public static String get(String url,Map<String,String> headers) throws ClientProtocolException, IOException {
    	HttpGet httpGet = new HttpGet(url);
    	for(Map.Entry<String, String> entry : headers.entrySet()){
    		httpGet.addHeader(entry.getKey(), entry.getValue());
        }
    	HttpResponse httpResponse = httpClient.execute(httpGet);
    	return EntityUtils.toString(httpResponse.getEntity());
    }

    /**
     * POST 请求
     * @param url
     * @param params
     * @param headers
     * @return
     * @throws ParseException
     * @throws IOException
     */
    public static String post(String url, Map<String, Object> params, Map<String, String> headers){
    	String str = "";
        try {
			HttpPost httpPost = new HttpPost(url);
			UrlEncodedFormEntity postEntity = new UrlEncodedFormEntity(getParam(params), "UTF-8");
			httpPost.setEntity(postEntity);
			if(headers != null){
			    addHeaders(httpPost, headers);
			}
			HttpResponse httpResponse = httpClient.execute(httpPost);


			str =   EntityUtils.toString(httpResponse.getEntity(),"UtF-8");
		} catch (Exception e) {
			logger.error("推送失败,url:"+url,e);
		}
        return str;
    }
    
    public static String post(String url, Map<String, String> headers){
    	String str = "";
        try {
			HttpPost httpPost = new HttpPost(url);
			if(headers != null){
			    addHeaders(httpPost, headers);
			}
			HttpResponse httpResponse = httpClient.execute(httpPost);


			str =   EntityUtils.toString(httpResponse.getEntity(),"UtF-8");
		} catch (Exception e) {
			logger.error("推送失败,url:"+url,e);
		}
        return str;
    }

    /**
     * POST 请求
     * @param url
     * @param
     * @param
     * @return
     * @throws ParseException
     * @throws IOException
     */
    public static String post1(String url, String str, String cookie) throws ParseException, IOException{

        HttpClient httpClient = new HttpClient();

        PostMethod post = new PostMethod(url);
        post.setRequestHeader("Cookie", cookie);
        post.setRequestHeader("bfw-ctrl", "json");
        post.setRequestHeader("Connection", "keep-alive");
        post.setRequestHeader("Content-Type", "text/json");
        post.setRequestHeader("Host", "ebsnew.boc.cn");
        post.setRequestHeader("Origin", "https://ebsnew.boc.cn");
        post.setRequestHeader("Referer", "https://ebsnew.boc.cn/boc15/welcome_ele.html?v=20171227064943706&locale=zh&login=card&segment=1");
        post.setRequestHeader("X-Requested-With", "XMLHttpRequest");
        RequestEntity entity = new StringRequestEntity(str, "text/html", "utf-8");
        // List list=new ArrayList<>();
        //list.add(new org.apache.commons.httpclient.NameValuePair("",""),new org.apache.commons.httpclient.NameValuePair("",""));
        post.addParameter("_locale", "zh_CN" );
        post.setRequestEntity(entity);
        httpClient.executeMethod(post);
        String result = post.getResponseBodyAsString();
        return result;
    }

    /**
     * 参数
     * @param parameterMap
     * @return
     */
    private static List<NameValuePair> getParam(Map<String, Object> parameterMap) {
        List<NameValuePair> param = new ArrayList<NameValuePair>();
        for(Map.Entry<String, Object> entry : parameterMap.entrySet()){
            param.add(new BasicNameValuePair(entry.getKey(), String.valueOf(entry.getValue())));
        }
        return param;
    }
    
    /**
     * 添加头
     * @param httpRequest
     * @param headerMap
     */
    private static void addHeaders(HttpEntityEnclosingRequestBase httpRequest, Map<String, String> headerMap){
        for(Map.Entry<String, String> entry : headerMap.entrySet()){
            httpRequest.addHeader(entry.getKey(), entry.getValue());
        }
    }
}