微信公眾號獲取access_token的方法實例分析
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?,F(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!
更多關于java算法相關內容感興趣的讀者可查看本站專題:《Java字符與字符串操作技巧總結》、《Java數(shù)組操作技巧總結》、《Java數(shù)學運算技巧總結》、《Java編碼操作技巧總結》和《Java數(shù)據(jù)結構與算法教程》
希望本文所述對大家java程序設計有所幫助。
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