Question

我想访问首先需要基本授权的网站，然后将参数（搜索关键字）发布到我的主页。

我的代码可以通过基本授权并获取响应文本，但是我无法获得搜索结果，而是获取主页代码。

因此，我打印了parameters.size（）并返回0，所以我怀疑HttpClient重定向方法在基本授权后没有传递参数。

按照我的代码尝试获取搜索结果：

List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("search_keyword", "test"));
params.add(new BasicNameValuePair("search_size", "50"));

DefaultHttpClient httpclient = new DefaultHttpClient();
httpclient.setRedirectStrategy(new DefaultRedirectStrategy() {                
    public boolean isRedirected(HttpRequest request, HttpResponse response, HttpContext context) throws ProtocolException  {
        boolean isRedirect=false;
        try {
            isRedirect = super.isRedirected(request, response, context);
        } catch (ProtocolException e) {
            throw e;
        }
        if (!isRedirect) {
            int responseCode = response.getStatusLine().getStatusCode();
            if (responseCode == 301 || responseCode == 302) {
                return true;
            }
        }
        return isRedirect;
    }
});

String encoding = Base64Encoder.encode("admin:password");   
HttpPost httppost = new HttpPost("http://127.0.0.1/MySystem/home");
httppost.setHeader("Authorization", "Basic " + encoding);   
httppost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));

//Execute and get the response.
HttpResponse response = httpclient.execute(httppost);
int responseCode = response.getStatusLine().getStatusCode();

switch(responseCode) {
    case HttpURLConnection.HTTP_OK:
        HttpEntity entity = response.getEntity();
        List<NameValuePair> parameters = new ArrayList<NameValuePair>(URLEncodedUtils.parse(entity));
        System.out.println("parameters size: "+parameters.size());
        for(NameValuePair p:parameters)
            System.out.println("parameter: "+ p.getName() + p.getValue());
        if(entity != null) {
            responseText = EntityUtils.toString(entity);
            System.out.println("responseText: ");
            System.out.println(responseText);
        }
        break;
    default:
        throw new Exception("Failed to pass the basic authorization. Response code: "+responseCode);
}

更新：

以下条件将返回true：

if (responseCode == 301 || responseCode == 302) {
   return true;
}

Answer 1

好的，我找到了解决方法。基本上，虽然302会将我重定向到另一个页面，但基本授权会话将在当前httpclient中传递。

解决方案是重用case HttpURLConnection.HTTP_OK:下的httpclient 并关闭实体缓冲区重定向器以防止“连接仍然分配”异常。

以下是示例代码：

String line;
BufferedReader br = new BufferedReader(new InputStreamReader(entity.getContent()));
StringBuilder sb = new StringBuilder();
while ((line = br.readLine()) != null) {
    sb.append(line);
}

br.close();
responseText = sb.toString();
....

HttpPost httppost2 = new HttpPost("http://127.0.0.1/MySystem/home");
httppost2.setHeader("Authorization", "Basic " + encoding);
httppost2.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
HttpResponse response2 = httpclient.execute(httppost2);
HttpEntity entity2 = response2.getEntity();

重定向后，Servlet不会收到post参数（响应代码302）

1 个答案: