首先你得有url吧

public final static String access_token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";

/**

* 获取access_token

*

* @param appid 凭证

* @param appsecret 密钥

* @return

*/

public static AccessToken getAccessToken(String appid, String appsecret) {

AccessToken accessToken = null;

String requestUrl = access_token_url.replace("APPID", appid).replace("APPSECRET", appsecret);

JSONObject jsonObject = httpRequest(requestUrl, "GET", null);

// 如果请求成功

if (null != jsonObject) {

try {

accessToken = new AccessToken();

accessToken.setToken(jsonObject.getString("access_token"));

accessToken.setExpiresIn(jsonObject.getInt("expires_in"));

} catch (JSONException e) {

accessToken = null;

// 获取token失败

log.error("获取token失败 errcode:{} errmsg:{}", jsonObject.getInt("errcode"), jsonObject.getString("errmsg"));

}

}

return accessToken;

}

public class AccessToken {

// 接口访问凭证

private String token;

// 凭证有效期，单位：秒

private int expiresIn;

public String getToken() {

return token;

}

public void setToken(String token) {

this.token = token;

}

public int getExpiresIn() {

return expiresIn;

}

public void setExpiresIn(int expiresIn) {

this.expiresIn = expiresIn;

}

}

这个http请求代码是借网上的

/**

* 发起https请求并获取结果

*

* @param requestUrl 请求地址

* @param requestMethod 请求方式(GET、POST)

* @param outputStr 提交的数据

* @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值)

*/

public static JSONObject httpRequest(String requestUrl, String requestMethod, String outputStr) {

JSONObject jsonObject = null;

StringBuffer buffer = new StringBuffer();

try {

// 创建SSLContext对象，并使用我们指定的信任管理器初始化

TrustManager[] tm = { new MyX509TrustManager() };

SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");

sslContext.init(null, tm, new java.security.SecureRandom());

// 从上述SSLContext对象中得到SSLSocketFactory对象

SSLSocketFactory ssf = sslContext.getSocketFactory();

URL url = new URL(requestUrl);

HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();

httpUrlConn.setSSLSocketFactory(ssf);

httpUrlConn.setDoOutput(true);

httpUrlConn.setDoInput(true);

httpUrlConn.setUseCaches(false);

// 设置请求方式(GET/POST)

httpUrlConn.setRequestMethod(requestMethod);

if ("GET".equalsIgnoreCase(requestMethod))

httpUrlConn.connect();

// 当有数据需要提交时

if (null != outputStr) {

OutputStream outputStream = httpUrlConn.getOutputStream();

// 注意编码格式，防止中文乱码

outputStream.write(outputStr.getBytes("UTF-8"));

outputStream.close();

}

// 将返回的输入流转换成字符串

InputStream inputStream = httpUrlConn.getInputStream();

InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");

BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

String str = null;

while ((str = bufferedReader.readLine()) != null) {

buffer.append(str);

}

bufferedReader.close();

inputStreamReader.close();

// 释放资源

inputStream.close();

inputStream = null;

httpUrlConn.disconnect();

jsonObject = JSONObject.fromObject(buffer.toString());

} catch (ConnectException ce) {

log.error("Weixin server connection timed out.");

} catch (Exception e) {

log.error("https request error:{}", e);

}

return jsonObject;

}

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

import javax.net.ssl.X509TrustManager;

/**

* 证书信任管理器(用于https请求)

*

* @author yangwl

* @date 2016年5月11日17:16:05

*/

public class MyX509TrustManager implements X509TrustManager {

public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {

}

public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {

}

public X509Certificate[] getAcceptedIssuers() {

return null;

}

}