微信公眾號獲取access_token的方法實例分析

更新時間：2019年10月25日 09:14:33 作者：游語

這篇文章主要介紹了微信公眾號獲取access_token的方法,結(jié)合實例形式分析了java實現(xiàn)微信公眾號獲取access_token的相關原理、實現(xiàn)方法及操作注意事項,需要的朋友可以參考下

本文實例講述了微信公眾號獲取access_token的方法。分享給大家供大家參考，具體如下：

上一版需求做了微信公眾號開發(fā)，秀了一波操作，也遇到了很多坑。現(xiàn)在把微信公眾號一些基本的操作記錄一下。

微信公眾號獲取access_token 官方文檔地址

access_token是公眾號的全局唯一接口調(diào)用憑據(jù)，我們和微信服務器進行交互，服務器通過access_token判斷我們是誰(哪個公眾號服務的請求)。所以我們在開發(fā)過程中服務端拿到的access_token是一定不能顯式暴露給外部，否則將導致數(shù)據(jù)安全問題。別人拿到你的accessToken操作你的公眾號。access_token的有效期目前為2個小時，過期需要再次獲取。

下面是一種獲取access_token方式

1.項目添加httpclient相關依賴，示例使用httpclient請求微信服務器，獲取微信返回結(jié)果。

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
  <dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>httpclient</artifactId>
   <version>4.5.3</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
  <dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>httpcore</artifactId>
   <version>4.4.6</version>
  </dependency>

2.httpClientUtil類，網(wǎng)上隨手找的試了一下本例的doget方法沒有問題，其他的暫不考慮

public class HttpClientUtil {
  public static String doGet(String url, Map<String, String> param) {
    // 創(chuàng)建Httpclient對象
    CloseableHttpClient httpclient = HttpClients.createDefault();
    String resultString = "";
    CloseableHttpResponse response = null;
    try {
      // 創(chuàng)建uri
      URIBuilder builder = new URIBuilder(url);
      if (param != null) {
        for (String key : param.keySet()) {
          builder.addParameter(key, param.get(key));
        }
      }
      URI uri = builder.build();
      // 創(chuàng)建http GET請求
      HttpGet httpGet = new HttpGet(uri);
      // 執(zhí)行請求
      response = httpclient.execute(httpGet);
      // 判斷返回狀態(tài)是否為200
      if (response.getStatusLine().getStatusCode() == 200) {
        resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        if (response != null) {
          response.close();
        }
        httpclient.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return resultString;
  }
  public static String doGet(String url) {
    return doGet(url, null);
  }
  public static String doPost(String url, Map<String, String> param) {
    // 創(chuàng)建Httpclient對象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";
    try {
      // 創(chuàng)建Http Post請求
      HttpPost httpPost = new HttpPost(url);
      // 創(chuàng)建參數(shù)列表
      if (param != null) {
        List<NameValuePair> paramList = new ArrayList<>();
        for (String key : param.keySet()) {
          paramList.add(new BasicNameValuePair(key, param.get(key)));
        }
        // 模擬表單
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,"utf-8");
        httpPost.setEntity(entity);
      }
      // 執(zhí)行http請求
      response = httpClient.execute(httpPost);
      resultString = EntityUtils.toString(response.getEntity(), "utf-8");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        response.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    return resultString;
  }
  public static String doPost(String url) {
    return doPost(url, null);
  }
  public static String doPostJson(String url, String json) {
    // 創(chuàng)建Httpclient對象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";
    try {
      // 創(chuàng)建Http Post請求
      HttpPost httpPost = new HttpPost(url);
      // 創(chuàng)建請求內(nèi)容
      StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
      httpPost.setEntity(entity);
      // 執(zhí)行http請求
      response = httpClient.execute(httpPost);
      resultString = EntityUtils.toString(response.getEntity(), "utf-8");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        response.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    return resultString;
  }
}

3.第三步就是簡單的測試代碼了

public class WeChatAccessTokenTest {
  public static void main(String[] args) {
    Map<String, String> params = new HashMap<>();
    // TODO: 2018/11/16 *號改成真實appid
    params.put("appid", "******");
    // TODO: 2018/11/16 *號改成真實secret
    params.put("secret", "******");
    params.put("grant_type", "client_credential");
    String response = HttpClientUtil.doGet("https://api.weixin.qq.com/cgi-bin/token", params);
    JSONObject accessTokenObject = JSONObject.parseObject(response);
    String accessToken = accessTokenObject.getString("access_token");
    Long expire = accessTokenObject.getLong("expires_in");
    System.out.println(accessToken);
  }
}

以上就是微信公眾號基礎卻比較重要的獲取access_token操作了！

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