com.squareup.okhttp3
  okhttp
  4.2.2

package com.puple.atto.datastructure;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Set;
import java.util.regex.*;
 
import okhttp3.Cookie;
import okhttp3.CookieJar;
import okhttp3.FormBody;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class Session {
 
  private final OkHttpClient mOkHttpClient = new OkHttpClient.Builder().cookieJar(new CookieJarManager()).build();
//　　 //如果直接写个类，里面写saveFromResponse和loadForRequest，而不实现CookieJar接口，运行可以正常通过，但ide会显红，因为Bulider类的cookieJsr方法需要接受CookieJar类型的实例。鸭子类除了能节约代码行数，在可理解性 可读性 多人合作性上面都不如接口规范，谁知道鸭子类里面要写什么方法，除了写代码得人自己。
  private class CookieJarManager implements CookieJar{
    private final HashMap> cookieStore = new HashMap<>();
 
    @Override
    public void saveFromResponse(HttpUrl url, List cookies) {
      cookieStore.put(url.host(), cookies);
    }
 
    @Override
    public List loadForRequest(HttpUrl url) {
      List cookies = cookieStore.get(url.host());
      return cookies != null ? cookies : new ArrayList(){};
    }
  }
 
  /**
   * @param url 要请求的url
   * @param paramsMap post的请求参数
   * @return post的返回结果
   */
  public String post(String url, HashMap paramsMap){
 
    FormBody.Builder formBodyBuilder = new FormBody.Builder();
    Set keySet = paramsMap.keySet();
    for(String key:keySet) {
      String value = paramsMap.get(key);
      formBodyBuilder.add(key,value);
    }
    FormBody formBody = formBodyBuilder.build();
    Request request = new Request
        .Builder()
        .post(formBody)
        .url(url)
        .build();
    try (Response response = mOkHttpClient.newCall(request).execute()) {
      String respStr = response.body().string();
 
      return respStr;
    }catch (Exception e){
 
      e.printStackTrace();
      return "";
    }
  }
 
  public String get(String url) {
    final Request.Builder builder = new Request.Builder();
    builder.url(url);
    final Request request = builder.build();
    try (Response response = mOkHttpClient.newCall(request).execute()) {
      return response.body().string();
    }catch (Exception e){
      e.printStackTrace();
      return "";
    }
  }
 
  public static void test(){
    Session ss=new Session();
    String loginUrl="http://192.168.9.244:8080/RDCJWeb/login";
    HashMap paramsMap = new HashMap<>() ;
    paramsMap.put("username","soft1");
    paramsMap.put("password","soft1");
    String respStr = ss.post(loginUrl,paramsMap);
 
    String res=ss.get("http://192.168.9.244:8080/RDCJWeb/static/dist/html/deviceWarn.html");
    System.out.println(res); 
  } 
  public static void main(String[] args) {
    test();
  } 
}