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java 如何取cookie

2026-03-03 07:23:02Java

获取 Cookie 的方法

在 Java 中获取 Cookie 通常涉及 HTTP 请求的处理，可以通过 HttpServletRequest 或第三方库（如 Apache HttpClient、OkHttp）实现。

使用 HttpServletRequest（Servlet 环境）

在 Servlet 中，可以通过 HttpServletRequest 对象直接获取 Cookie 数组：

Cookie[] cookies = request.getCookies();
if (cookies != null) {
    for (Cookie cookie : cookies) {
        String name = cookie.getName();
        String value = cookie.getValue();
        System.out.println("Cookie Name: " + name + ", Value: " + value);
    }
}

使用 Apache HttpClient

通过 HttpClient 发送请求后，可以从响应中提取 Cookie：

CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("https://example.com");
CloseableHttpResponse response = httpClient.execute(httpGet);

CookieStore cookieStore = new BasicCookieStore();
HttpContext context = HttpClientContext.create();
context.setCookieStore(cookieStore);

List<Cookie> cookies = cookieStore.getCookies();
for (Cookie cookie : cookies) {
    System.out.println("Cookie: " + cookie.getName() + "=" + cookie.getValue());
}

使用 OkHttp

通过 OkHttp 的 Response 对象可以获取 Cookie 头信息：

OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
    .url("https://example.com")
    .build();

Response response = client.newCall(request).execute();
String cookiesHeader = response.header("Set-Cookie");
System.out.println("Cookies: " + cookiesHeader);

使用 Java 11+ 的 HttpClient

Java 11 引入的 HttpClient 也支持 Cookie 处理：

java 如何取cookie

HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://example.com"))
    .build();

HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
Optional<String> cookies = response.headers().firstValue("Set-Cookie");
cookies.ifPresent(System.out::println);