获取原始HTTP响应标头

该

getHeaderField()

方法对我不起作用

您是在的情况下问这个的

java.net.URLConnection

URLconnection

package com.stackoverflow.q2307291;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.Socket;public class Test {    public static void main(String[] args) throws IOException {        String hostname = "stackoverflow.com";        int port = 80;        Socket socket = null;        PrintWriter writer = null;        BufferedReader reader = null;        try { socket = new Socket(hostname, port); writer = new PrintWriter(new OutputStreamWriter(socket.getOutputStream())); writer.println("GET / HTTP/1.1"); writer.println("Host: " + hostname); writer.println("Accept: */*"); writer.println("User-Agent: Java"); // Be honest. writer.println(""); // important, else the server will expect that there's more into the request. writer.flush(); reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); for (String line; (line = reader.readLine()) != null;) {     if (line.isEmpty()) break; // Stop when headers are completed. We're not interested in all the HTML.     System.out.println(line); }        } finally { if (reader != null) try { reader.close(); } catch (IOException logOrIgnore) {}  if (writer != null) { writer.close(); } if (socket != null) try { socket.close(); } catch (IOException logOrIgnore) {}         }    }}

为了避免每个尝试此代码片段的人都使SO过载，输出如下所示：

HTTP / 1.1 200 OK缓存控制：私有内容类型：text / html; 字符集= utf-8过期：2010年2月21日，星期日，格林尼治标准时间伺服器：Microsoft-IIS / 7.5日期：2010年2月21日，星期日，格林尼治标准时间连接方式：关闭内容长度：208969

要了解有关以低级方式发送HTTP请求的更多信息，请阅读HTTP规范。

但是，您可能想使用

getHeaderFields()

getHeaderField()

List<String> cookies = connection.getHeaderFields().get("Set-cookie");