java通过非request获取application

最新推荐文章于 2024-04-30 15:16:48 发布

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本文详细介绍了如何使用Apache HttpClient 4.5.2发起HTTP请求，并通过Servlet API获取和使用Cookie进行用户身份验证。展示了如何将Cookie信息添加到HTTP请求头中，实现跨域请求时的身份维持。

//HttpClient
compile("org.apache.httpcomponents:httpclient:4.5.2")

获取：

ServletRequestAttributes attributes = (ServletRequestAttributes)
    RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
ServletContext servletContext = request.getSession().getServletContext();
// 获取cookie
Cookie cookie = (Cookie) servletContext.getAttribute("xxx");

塞入http后台请求：

{

    // 创建Httpclient对象
    CloseableHttpClient httpclient = HttpClients.createDefault();
    String cookieStr = null;
    // 使用cookie识别用户身份
    if (url.equals(Properties.commentUrl) || url.equals(Properties.collectUrl)) {
      ServletRequestAttributes attributes = (ServletRequestAttributes)
          RequestContextHolder.getRequestAttributes();
      HttpServletRequest request = attributes.getRequest();
      // 获取cookie传入
      Cookie cookie = CookUtils.getCookieByName(request, Constants.XXX);
      if (cookie != null) {
        cookieStr = cookie.getName() + "=" + cookie.getValue();
      }
    }
    String resultString = "";
    CloseableHttpResponse response = null;
    try {
      // 创建uri
      URIBuilder builder = new URIBuilder(url);
      if (param != null) {
        for (String key : param.keySet()) {
          builder.addParameter(key, param.get(key));
        }
      }
      URI uri = builder.build();

      // 创建http GET请求
      HttpGet httpGet = new HttpGet(uri);
      if (cookieStr != null) {
        httpGet.addHeader(new BasicHeader("Cookie", cookieStr));
      }

      // 执行请求
      response = httpclient.execute(httpGet);
      // 判断返回状态是否为200
      if (response.getStatusLine().getStatusCode() == 200) {
        resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        if (response != null) {
          response.close();
        }
        httpclient.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return resultString;
  }