工具类utils：

package co.yixiang.utils;import com.alibaba.fastjson.JSONObject;import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;/*** @author xyp* @data 2020/7/3*/
public class HttpUtil {/*** 向指定URL发送GET方法的请求** @param url*            发送请求的URL* @param param*            请求参数* @param authorization*            请求参数(允许为空)* @param cookie*            请求参数(允许为空)* @return URL 所代表远程资源的响应结果*/public static String sendGet(String url, Map<String, String> param, String authorization, String cookie) {String result = "";BufferedReader in = null;try {StringBuffer query = new StringBuffer();for (Map.Entry<String, String> kv : param.entrySet()) {query.append(URLEncoder.encode(kv.getKey(), "UTF-8") + "=");query.append(URLEncoder.encode(kv.getValue(), "UTF-8") + "&");}if (query.lastIndexOf("&") > 0) {query.deleteCharAt(query.length() - 1);}String urlNameString = url + "?" + query.toString();URL realUrl = new URL(urlNameString);// 打开和URL之间的连接URLConnection connection = realUrl.openConnection();// 设置通用的请求属性connection.setRequestProperty("accept", "*/*");connection.setRequestProperty("connection", "Keep-Alive");connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");connection.setRequestProperty("Content-Type", "application/json;charset=UTF-8");if (authorization != null){connection.setRequestProperty("Authorization", authorization);}if (cookie != null){connection.setRequestProperty("Cookie", cookie);}// 建立实际的连接connection.connect();// 定义 BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(connection.getInputStream()));String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {e.printStackTrace();}// 使用finally块来关闭输入流finally {try {if (in != null) {in.close();}} catch (Exception e2) {e2.printStackTrace();}}return result;}/*** 向指定 URL 发送POST方法的请求** @param url*            发送请求的 URL* @param param*            请求参数* @param authorization*            请求参数(允许为空)* @param cookie*            请求参数(允许为空)* @return 所代表远程资源的响应结果*/public static String sendPost(String url, Map<String, String> param, String authorization, String cookie) {PrintWriter out = null;BufferedReader in = null;String result = "";try {String para = "";for (String key : param.keySet()) {para += (key + "=" + param.get(key) + "&");}if (para.lastIndexOf("&") > 0) {para = new String(para.substring(0, para.length() - 1));}String urlNameString = url + "?" + para;URL realUrl = new URL(urlNameString);// 打开和URL之间的连接HttpURLConnection  conn = (HttpURLConnection)realUrl.openConnection();// 设置通用的请求属性conn.setRequestProperty("accept", "*/*");conn.setRequestProperty("connection", "Keep-Alive");conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");conn.setRequestProperty("Content-Type", "application/json;charset=UTF-8");if (authorization != null){conn.setRequestProperty("Authorization", authorization);}if (cookie != null){conn.setRequestProperty("Cookie", cookie);}// 发送POST请求必须设置如下两行conn.setDoOutput(true);conn.setDoInput(true);// 获取URLConnection对象对应的输出流out = new PrintWriter(conn.getOutputStream());// 发送请求参数out.print(param);// flush输出流的缓冲out.flush();// 定义BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(conn.getInputStream()));String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {e.printStackTrace();}// 使用finally块来关闭输出流、输入流finally {try {if (out != null) {out.close();}if (in != null) {in.close();}} catch (IOException ex) {ex.printStackTrace();}}return result;}/*** 发送post请求* @param url*            发送请求的 URL* @param param*            请求参数* @param authorization*            请求参数(允许为空)* @param cookie*            请求参数(允许为空)* @return 所代表远程资源的响应结果*/public static String sendPost(String url, String param, String authorization, String cookie) {PrintWriter out = null;BufferedReader in = null;String result = "";try {URL realUrl = new URL(url + "?" + param);// 打开和URL之间的连接URLConnection conn = realUrl.openConnection();// 设置通用的请求属性conn.setRequestProperty("accept", "*/*");conn.setRequestProperty("connection", "Keep-Alive");conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");conn.setRequestProperty("Content-Type", "application/json;charset=UTF-8");if (authorization != null){conn.setRequestProperty("Authorization", authorization);}if (cookie != null){conn.setRequestProperty("Cookie", cookie);}// 发送POST请求必须设置如下两行conn.setDoOutput(true);conn.setDoInput(true);// 获取URLConnection对象对应的输出流out = new PrintWriter(conn.getOutputStream());// 发送请求参数out.print(param);// flush输出流的缓冲out.flush();// 定义BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(conn.getInputStream()));String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {e.printStackTrace();}//使用finally块来关闭输出流、输入流finally {try {if (out != null) {out.close();}if (in != null) {in.close();}} catch (IOException ex) {ex.printStackTrace();}}return result;}public static void main(String[] args) {//请求参数String body = "{\"status\":[1],\"customerid\":[\"20000047\"],\"sdorderno\":[1580459238218],\"total_fee\":[\"100.00\"],\"paytime\":[1580459238218],\"sign\":[\"a0397aef701f13e79133566582afa903\"]}";//请求头，可变，根据实际来String authorization = "Bearer eyJhbGciOiJIUzUxMiJ9.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.p_AEZfwErkRQCJ9ctZBNgf9fniLPGogV9rxSGyZEqStOOv7YEdAcefsAJNnUxzOOhLCdwhGBBAEDDVn3x43A3A";//cookie值，可变，根据实际来String cookie = "YSHOP-TOEKN=Bearer%20eyJhbGciOiJIUzUxMiJ9.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.p_AEZfwErkRQCJ9ctZBNgf9fniLPGogV9rxSGyZEqStOOv7YEdAcefsAJNnUxzOOhLCdwhGBBAEDDVn3x43A3A";String jsionResult=HttpUtil.sendPost("http://192.168.18.1:8013/api/callback",body,authorization,cookie);System.out.println(jsionResult);}
}

后台接受请求的Controller类里请求对应的方法：

	/*** 测试方法* /@PostMapping(value = "/callback")@Log("订单回调到下游")@ApiOperation("订单回调到下游")public ResponseEntity<Object> callback(@RequestBody Map<String,Object> callbackPama){return new ResponseEntity<>(ibBankOrderApiService.callback(callbackPama), HttpStatus.OK);}

这种方式类似于用Java的方式模拟postman软件里的post请求：