微信开发之获取accessToken

public static String getToken(String apiurl, String appid, String secret)
{
String turl = String.format(
"%s?grant_type=client_credential&appid=%s&secret=%s", apiurl,
appid, secret);
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(turl);
JsonParser jsonparer = new JsonParser();// 初始化解析json格式的对象
String result = null;
try
{
HttpResponse res = client.execute(get);
String responseContent = null; // 响应内容
HttpEntity entity = res.getEntity();
responseContent = EntityUtils.toString(entity, "UTF-8");
JsonObject json = jsonparer.parse(responseContent)
.getAsJsonObject();
// 将json字符串转换为json对象
if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK)
{
if (json.get("errcode") != null)
{// 错误时微信会返回错误码等信息，{"errcode":40013,"errmsg":"invalid appid"}
}
else
{// 正常情况下{"access_token":"ACCESS_TOKEN","expires_in":7200}
result = json.get("access_token").getAsString();
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
// 关闭连接 ,释放资源
client.getConnectionManager().shutdown();
return result;
}
}