1、Post请求传json数据

        // 省略前面声明请求、设置Header等操作，直接从传递参数开始
        JSONObject json = new JSONObject();
　　　　　json.put("filePath","js");
　　　　　json.put("projectId","61020ccdfd33d86b6abe8745");
　　　　　json.put("type","fileFolder");
　　　　　// 将参数放到Post中
　　　　　// 通过new StringEntity()，可将Content-Type设置为text/plain类型或则json类型
        httpPost.setEntity(new StringEntity(json.toString(),"UTF-8"));

import com.alibaba.fastjson.JSONObject;

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 java.io.IOException;
import java.util.ArrayList;
import java.util.List;
 * @Author: yc
 * @Description: HttpClient发送Post请求
 * @Date: 2021/07/27/18:32
public class HttpClientUtil {
	//发送请求的url
    public static String url = "http://192.168.9.247:3080/co/cmd/deleteProject";
    public static void deletePost() throws IOException {
        // 获取HttpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 声明Post请求
        HttpPost httpPost = new HttpPost(url);
        // 设置请求头，在Post请求中限制了浏览器后才能访问
        httpPost.addHeader("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36");
        httpPost.addHeader("Accept", "*/*");
        httpPost.addHeader("Accept-Encoding", "gzip, deflate, br");
        httpPost.addHeader("Content-Type", "application/json");
//        httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded");
        httpPost.addHeader("Accept-Language", "zh-CN,zh;q=0.9,en;q=0.8");
        httpPost.addHeader("Connection", "keep-alive");
        // 设置token
        //httpPost.addHeader("Authorization","eyJ0eXAiOiJKV1QiLCJhbGciOiJIDASDUzI1NiJ9.eyJleHAiOjE2Mjc0NTQzODYsInVzZXJuYW1lIjoiYWJjZCJ9.MYvNg03txeNm_KiI27fdS0KViVxWhLntDjBjiP44UYQDASCSACCSA");
　　　　　JSONObject json = new JSONObject();
　　　　　json.put("filePath","js");
　　　　　json.put("projectId","61020ccdfd33d86b6abe8745");
　　　　　json.put("type","fileFolder");
　　　　　// 发送 json 类型数据，通过new StringEntity()，可将Content-Type设置为text/plain类型
        httpPost.setEntity(new StringEntity(json.toString(),"UTF-8"));
　　　　　// 设置参数（发送 普通参数 数据类型）
        List<NameValuePair> parameters = new ArrayList<NameValuePair>();
        for(String key:json.keySet()) {
            parameters.add(new BasicNameValuePair(key, json.getString(key)));
        // 将Content-Type设置为application/x-www-form-urlencoded类型
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");
        httpPost.setEntity(formEntity);
        // 发送请求
        CloseableHttpResponse response = httpClient.execute(httpPost);
        if (response.getStatusLine().getStatusCode() == 200) {
            HttpEntity entity = response.getEntity();
            // 获取返回的信息
            String string = EntityUtils.toString(entity, "UTF-8");
            System.out.println(string);
            System.out.println("删除失败，请重试！！！");
        // 关闭response、HttpClient资源
        response.close();
        httpClient.close();
2、Post请求传普通参数表单传参数
        JSONObject json = new JSONObject();
　　　　　json.put("filePath","js");
　　　　　json.put("projectId","61020ccdfd33d86b6abe8745");
　　　　　json.put("type","fileFolder");
　　　　　// 设置参数
        List<NameValuePair> parameters = new ArrayList<NameValuePair>();
        for(String key:json.keySet()) {
            parameters.add(new BasicNameValuePair(key, json.getString(key)));
        // 将Content-Type设置为application/x-www-form-urlencoded类型
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");
        httpPost.setEntity(formEntity);
原文来自：https://blog.csdn.net/qq_43758789/article/details/119222073