在Linux下服务器获取用户openid报错 - WXOPEN Club

在自己的windows电脑上可以向微信提供的地址发送请求获取到openid，但是项目部署到Linux上以后会出现java.net.UnknownHostException: api.weixin.qq.com这个错误。我在Linux上ping api.weixin.qq.com是可以ping通的，而且昨天下午还没这个问题，晚上忽然就开始报这个错误。

下面是Java发送请求的代码(requestUrl为官方提供的，requestMethod为GET，报错的地方为下面httpUrlConn.connect()那里)：

public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {

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();

System.out.println("inputStream is null? "+(inputStream==null));

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();

} catch (ConnectException ce) {

System.out.println(“connection Exeception”);

System.out.println(ce.getMessage());

ce.printStackTrace();

} catch (NoSuchAlgorithmException e) {