怎么在java中实现类似于python的requests模块的session功能呢。java也是可以实现的，用java的okhttp包可以实现。

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();

}

}

原文：https://www.cnblogs.com/linwenbin/p/11800132.html