java - HttpsUrlConnection 在 GET 请求时遇到 EOF 异常

Question

我正在通过 https 从服务器获取一些数据。问题是当我尝试运行此代码时，它只写入空字符串(response.toString() 返回空)。但是当我在 BufferedReader 行之前添加 Thread.sleep 方法时，它工作得非常完美(从服务器返回完整数据)。这里的主要问题是什么？

   private static void httpGet(String urlStr, String[] paramName, String[] paramVal) throws Exception {
    URL url = new URL(urlStr);
    HttpsURLConnection conn
            = (HttpsURLConnection) url.openConnection();
    conn.setReadTimeout(10000);
    conn.setConnectTimeout(15000);
    conn.setRequestMethod("GET");
    conn.setDoOutput(true);
    conn.setDoInput(true);
    conn.setUseCaches(false);
    conn.setAllowUserInteraction(false);
    conn.setRequestProperty(COOKIE_HEADER, param);

    if (conn != null) {
    //Thread.sleep(1000);
    BufferedReader in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
     System.out.println(response.toString());
    }
   }

Answer 1

嗯，你的代码对我有用；-) 即使没有 Thread.sleep - 见下文 - 我正在从“Oracle”中提取数据。另外请不要忘记关闭输入流。

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

public class URLConnectionReader {
public static void main(String[] args) throws Exception {
    URL url = new URL("https://www.oracle.com");
    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
    conn.setReadTimeout(10000);
    conn.setConnectTimeout(15000);
    conn.setRequestMethod("GET");
    conn.setDoOutput(true);
    conn.setDoInput(true);
    conn.setUseCaches(false);
    conn.setAllowUserInteraction(false);
    //conn.setRequestProperty("COOKIE_HEADER", param);

    if (conn != null) {
        // Thread.sleep(1000);
        BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        System.out.println(response.toString());
    }
}

}