示例代码

try (CloseableHttpClient httpclient = HttpClients.createDefault();
   CloseableHttpResponse response = null;) {

  URIBuilder builder = new URIBuilder(url); // 创建uri
  if (param != null) {
    for (String key : param.keySet()) {
      builder.addParameter(key, param.get(key));
    }
  }

  URI uri = builder.build();

  HttpGet httpGet = new HttpGet(uri); // 创建http GET请求

  response = httpclient.execute(httpGet); // 执行请求
} catch (Exception e) {
  log.info("exception: " + e);
}

出现错误提示：Cannot assign a value to final variable 'response'

Java - try-with-resources_get请求

说明 try() 里的是final变量，不能改变，仅此标记。