HTTP連接如何保持登錄狀態？OkHttp或者HttpClient

上節我們講過HTTP客戶端，基於它們的優劣勢，一般使用OkHttp或者HttpClient。所以這節我們主要針對這兩個HTTP客戶端實現登錄一直保持功能。

OkHttp

設置cookie請求消息頭的方式還可以實現身份認證功能。

// 創建HTTP客戶端
OkHttpClient client = new OkHttpClient.Builder()
        .cookieJar(new CookieJar() {
            // 使用ConcurrentMap存儲cookie信息，因為數據在內存中，所以只在程序運行階段有效，程序結束后即清空
            private ConcurrentMap<String, List<Cookie>> storage = new ConcurrentHashMap<>();

            @Override
            public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
                String host = url.host();
                if (cookies != null && !cookies.isEmpty()) {
                    storage.put(host, cookies);
                }
            }

            @Override
            public List<Cookie> loadForRequest(HttpUrl url) {
                String host = url.host();
                List<Cookie> list = storage.get(host);
                return list == null ? new ArrayList<>() : list;
            }
        })
        .build();

final String userAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36";

// 模擬表單登錄
Request request = new Request.Builder()
        .url("https://www.oschina.net/action/user/hash_login?from=")
        .post(new FormBody.Builder()
                .add("email", "修改為你自己的帳號")
                .add("pwd", "修改為你自己的密碼，使用SHA-1加密")
                .add("verifyCode", "")
                .add("save_login", "1")
                .build())
        .addHeader("User-Agent", userAgent)
        .build();

// 執行模擬登錄請求
Response response = client.newCall(request).execute();

// response status
if (!response.isSuccessful()) {
    log.info("code = {}, message = {}", response.code(), response.message());
    return;
} else {
    log.info("登錄成功 !");
}


// 請求包含用戶狀態信息的網頁，觀察能否正確請求並取得狀態信息
request = new Request.Builder()
        .url("https://www.oschina.net/")
        .addHeader("User-Agent", userAgent)
        .get()
        .build();

// 執行GET請求，並在異步回調中處理請求
response = client.newCall(request).execute();

// 打印登錄用戶名，驗證是否獲取到了用戶的登錄信息(狀態信息)
if (response.isSuccessful()) {
    String content = response.body().string();

    Matcher matcher = Pattern.compile("<span class=\"name\">(.*)</span>，您好&nbsp;").matcher(content);
    if (matcher.find()) {
        log.info("登錄用戶：{}", matcher.group(1));
    } else {
        log.info("用戶未登錄");
    }

}

HttpClient

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.HttpGet;
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 java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
 
public class Test  {
 
    public static void main(String[] args) throws IOException {
        InputStreamReader inputStreamReader = null;
        BufferedReader reader = null;
        String line = null;
        //兩個頁面參數
        //據我觀察這個url不變
        String backUrl = "http%3A%2F%2Fredmine.tvbanywhere.net%2Fredmine%2F";
        String authenticityToken = null;
 
        //創建httpclient對象
        CloseableHttpClient httpClient = HttpClients.createDefault();
 
        //get請求訪問這個url是頁面
        //獲取auth_token
        HttpGet getParam = new HttpGet("http://redmine.tvbanywhere.net/redmine/login");
        CloseableHttpResponse response1 = httpClient.execute(getParam);
        InputStream inputStream1 = response1.getEntity().getContent();
        inputStreamReader = new InputStreamReader(inputStream1);
        reader = new BufferedReader(inputStreamReader);
        while ((line = reader.readLine())!= null){
            if (line.contains("name=\"authenticity_token\"")){
                System.out.println(line);
                String sub1 = line.substring(line.indexOf("value=\"") + 7);
                authenticityToken = sub1.substring(0, sub1.indexOf("\""));
            }
        }
        reader.close();
        inputStreamReader.close();
        inputStream1.close();
        //post 請求是登錄操作
        HttpPost dologin = new HttpPost("http://redmine.tvbanywhere.net/redmine/login");
        List<NameValuePair> list = new ArrayList<NameValuePair>();
        list.add(new BasicNameValuePair("authenticity_token",authenticityToken));
        list.add(new BasicNameValuePair("back_url",backUrl));
        list.add(new BasicNameValuePair("username","[e-mail]"));
        list.add(new BasicNameValuePair("password","[e-mail]"));
        UrlEncodedFormEntity urlEncodedFormEntity = null;
        urlEncodedFormEntity = new UrlEncodedFormEntity(list);
        dologin.setEntity(urlEncodedFormEntity);
        CloseableHttpResponse response2 = httpClient.execute(dologin);
 
        HttpGet get1 = new HttpGet("http://redmine.tvbanywhere.net/redmine/search?issues=1&q=[e-mail]");
        CloseableHttpResponse response3 = httpClient.execute(get1);
        System.err.println("get" + get1.getURI());
        InputStream inputStream3 = response3.getEntity().getContent();
        inputStreamReader = new InputStreamReader(inputStream3);
        reader = new BufferedReader(inputStreamReader);
        while ((line = reader.readLine()) != null){
            System.out.println(line);
        }
    }
}