无法在java中发出http POST请求？

我仍然无法发出请求。

您正在成功收到一个响应，该响应不包含“logontoken”标题。很可能是因为响应不是HTTP 200 OK响应。为什么？我们不知道，这完全取决于服务器在HTTP之上实现的协议

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话虽如此，使用

httppost.setEntity（新的UrlEncodedFromEntity（后参数））

和

httppost.addHeder（“内容类型”，“应用程序/json”）

对我来说并不合适。URL编码的表单实体不是json内容类型。因此，要么将您的post参数转换为json，要么丢失内容类型标题。

请检查我发布的替代方法，无法添加请求正文，如何实现此目的？@“我无法发出请求”不是问题的描述。你需要准确地解释问题是什么。至少，您需要检查响应状态，并告诉我们它是什么。HTTP/1.1 401 Unauthorized是我获得@Mike Nakis的状态

static HttpClient  httpclient = new DefaultHttpClient();
static HttpPost httppost = new HttpPost("http://servername:6405/biprws/logon/long");
public static void main(String[] args) throws ClientProtocolException, IOException {
          ArrayList<NameValuePair> postParameters  = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("userName", "Administrator"));
        postParameters.add(new BasicNameValuePair("password", "test"));
        postParameters.add(new BasicNameValuePair("auth", "secEnterprise"));
       httppost.setEntity(new UrlEncodedFormEntity(postParameters));
        httppost.addHeader("accept", "application/json");
        httppost.addHeader("Content-Type", "application/json");
        HttpResponse response = httpclient.execute(httppost);
        Header s = response.getFirstHeader("logontoken");
        String s1 =  s.getValue();
        System.out.println(s1);// null pointer exception here
    }

HttpClient client1 = new DefaultHttpClient();
     HttpPost post = new HttpPost("http://servername:6405/biprws/logon/long");
     String json = "{\"UserName\":\"Administrator\",\"Password\":\"test\",\"Auth\":\"secEnterprise\"}";
     StringEntity entity = new StringEntity(json,"UTF-8");
     entity.setContentType("application/json");
     post.setEntity(entity);
     System.out.println(entity);
     post.setHeader("Accept", "application/json");

     HttpResponse response = client1.execute(post);
     BufferedReader rd1 = new BufferedReader(
             new InputStreamReader(response.getEntity().getContent()));


    String result1 = null;
    String line1 = "";

        result1 =  rd1.readLine();
        System.out.println(result1);