Java实现post请求（带有参数）

package Sort.pay;import net.sf.JSON.jsONObject;import org.apache.commons.codec.digest.DigestUtils;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.URL;import java.net.URLConnection;import java.util.*;public class Pay {    public static void main(String[] args) {        String url = "Http://xxxxxx";//访问路径        Random random = new Random();        Map map = new HashMap<>();        map.put("authCode", "1423009170000001");        map.put("resource", "api.hl.order.pay.unified");        map.put("requestTime", "20230129105758");        map.put("versionNo", "1");        Map params = new HashMap<>();        params.put("businessOrderNo", random.nextInt(1000000000));//202105623000002        params.put("payAmount", "90.00");        params.put("remark", "购买山核桃20斤");        params.put("merchantNo", "771389");        params.put("operatorAccount", "19884151060");        params.put("deviceNo", "402102317000001");        params.put("notifyUrl", "http://testapi.liankok.com/notify/pay");        params.put("payExpireTime", "600");        params.put("limitPay", "1");        params.put("payUrlExpireTime", "60");        params.put("subject", "山核桃");        params.put("GoodsTag", "guolicheng");        params.put("goodsInfo", "{\"receiptid\":\"323323\",\"costprice\":200.00,\"goodsdetail\":[{\"goodsid\":\"123123123\",\"goodsname\":\"小石头\",\"thirdgoodsid\":\"23323453\",\"quantity\":1,\"price\":5.00}]}");        map.putAll(params);//            map.put("params",params);        //排序集合        map = PaySortUtil.sortByKey(map);        //遍历输出拼接字符串        Set keys = map.keySet();        String str = "";        for (String key : keys) {            str += key + "=" + map.get(key) + "&";        }        str = str.toLowerCase() + "U7iIPg2x1k";        //md5加密字符串        String md5sr = DigestUtils.md5Hex(str);        map.put("sign", md5sr);        Map map3 = new HashMap<>();//存放结果        //将需要比较删除的两个集合添加        map3.putAll(map);        map3.putAll(params);        //for - each遍历比较且删除        for (String a : map.keySet()) {            if (params.containsKey(a) || params.containsValue(map.get(a))) {                map3.remove(a);            }        }        map3.put("versionNo", "1");        map3.put("params", params);        System.out.println(map3);        JSONObject jsonObject=JSONObject.fromObject(map3);        System.out.println(jsonObject.toString());       String ss= Pay.sendPost(url,jsonObject.toString());        System.out.println(ss);    }    public static String sendPost(String url,String param) {        PrintWriter out = null;        BufferedReader in = null;        String result = "";        try {            URL realUrl = new URL(url);            // 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("Content-Type", "application/json");            conn.setRequestProperty("connection", "Keep-Alive");            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; windows NT 5.1;SV1)");            // 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) {            System.err.println("发送POST请求出现异常！" + 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;    }}class PaySortUtil {    public static Map sortByKey(Map map){        //创建一个带有比较器的TreeMap        Map treeMap = new TreeMap<>(String::compareTo);        //将你的map传入treeMap        treeMap.putAll(map);        return treeMap;    }}

pom文件所需依赖，有些依赖不是必需的，这里没有删除

                     org.apache.httpcomponents            httpcore            4.0.1                            org.apache.httpcomponents            httpclient            4.5.2                            org.apache.httpcomponents            httpmime            4.5.2                            com.google.guava            guava            16.0.1                            org.slf4j            slf4j-api            1.7.25                            com.alibaba            fastjson            1.2.78                                    org.apache.commons            commons-lang3            3.12.0                            commons-codec            commons-codec            1.3                            org.apache.Maven.surefire            maven-surefire-common            2.12.4                            org.kie.modules            org-apache-commons-httpclient            6.2.0.CR2            pom                                    commons-beanutils            commons-beanutils            1.9.3                            commons-collections            commons-collections            3.2.1                            commons-lang            commons-lang            2.6                            commons-logging            commons-logging            1.1.1                            net.sf.ezmorph            ezmorph            1.0.6                            net.sf.json-lib            json-lib            2.2.3            jdk15                                7        7    

来源地址：https://blog.csdn.net/wnagqie/article/details/128790791