在pom.xml中加入相关依赖

 com.squareup.okhttp3  okhttp  4.2.2

后面是相关的java代码：

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();  } }