Question

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
    }

运行上面的代码我无法将请求主体添加到POST请求中。我怎样才能做到这一点？

我遵循的替代方法：

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);

我仍然无法提出要求。

Answer 1

您成功收到不包含＆＃34; logontoken＆＃34;的回复头。很可能是因为响应不是HTTP 200 OK响应。为什么？我们不知道，这完全取决于您的服务器在HTTP之上实现的协议。

话虽如此，使用httppost.setEntity(new UrlEncodedFromEntity(postParameters))和httppost.addHeder("Content-Type", "application/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post参数转换为json，要么丢失内容类型标题。

无法在java中发出http POST请求？

1 个答案: