微信公众号获取access_token的方法实例分析

微信公众号获取access_token的方法实例分析

下面是一种获取access_token方式

1.项目添加httpclient相关依赖，示例使用httpclient请求微信服务器，获取微信返回结果。

org.apache.httpcomponents

httpclient

4.5.3

org.apache.httpcomponents

httpcore

4.4.6

2.httpClientUtil类，网上随手找的 试了一下本例的doget方法 没有问题，其他的 暂不考虑

public class HttpClientUtil {

public static String doGet(String url, Map param) {

// 创建Httpclient对象

CloseableHttpClient httpclient = HttpClients.createDefault();

String resultString = "";

CloseableHttpResponse response = null;

try {

// 创建uri

URIBuilder builder = new URIBuilder(url);

if (param != null) {

for (String key : param.keySet()) {

builder.addParameter(key, param.get(key));

}

}

URI uri = builder.build();

// 创建http GET请求

HttpGet httpGet = new HttpGet(uri);

// 执行请求

response = httpclient.execute(httpGet);

// 判断返回状态是否为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 param) {

// 创建Httpclient对象

CloseableHttpClient httpClient = HttpClients.createDefault();

CloseableHttpResponse response = null;

String resultString = "";

try {

// 创建Http Post请求

HttpPost httpPost = new HttpPost(url);

// 创建参数列表

if (param != null) {

List paramList = new ArrayList<>();

for (String key : param.keySet()) {

paramList.add(new BasicNameValuePair(key, param.get(key)));

}

// 模拟表单

UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,"utf-8");

httpPost.setEntity(entity);

}

// 执行http请求

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) {

// 创建Httpclient对象

CloseableHttpClient httpClient = HttpClients.createDefault();

CloseableHttpResponse response = null;

String resultString = "";

try {

// 创建Http Post请求

HttpPost httpPost = new HttpPost(url);

// 创建请求内容

StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);

httpPost.setEntity(entity);

// 执行http请求

response = httpClient.execute(httpPost);

vrKuqresultString = 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.第三步就是简单的测试代码了

public class WeChatAccessTokenTest {

public static void main(String[] args) {

Map params = new HashMap<>();

// TODO: 2018/11/16 *号改成真实appid

params.put("appid", "******");

// TODO: 2018/11/16 *号改成真实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);

}

}

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