'HttpHeaders()' has private access in 'org.apache.http.HttpHeaders'

这是一个编译错误，意思是在调用org.apache.http.HttpHeaders类的构造函数时，由于其构造函数是私有的，所以无法访问它。可能的原因是你试图直接创建HttpHeaders的实例，而HttpHeaders类没有提供可供外部访问的公共构造函数。解决方法是改用该类的公共静态方法来获取实例，而不是直接调用构造函数。例如，你可以使用HttpHeaders的静态方法`HttpHeaders.create()`来创建一个实例。

相关问题

HttpHeaders headers = new HttpHeaders(); headers.set("Content-Type", "application/json");报'HttpHeaders()' has private access in 'org.apache.http.HttpHeaders'如何修改

这个错误是因为HttpHeaders构造函数是私有的，不能直接通过new来创建实例。正确的创建HttpHeaders实例的方法是通过HttpClient类中的createDefault()方法来创建一个默认的HttpClient实例，然后使用该实例的getHeaders()方法来获取HttpHeaders实例。

示例代码如下：

CloseableHttpClient httpClient = HttpClients.createDefault();
HttpHeaders headers = httpClient.getHeaders();
headers.set("Content-Type", "application/json");

这样就可以成功创建HttpHeaders实例并设置头部信息了。

org.apache.http.client.methods.HttpPost

HttpPost is a class in the Apache HttpClient library that represents an HTTP POST request. It is used to send data to a web server in the form of a request body.

To use HttpPost, you need to create an instance of this class and set the URL of the server you want to send the request to. You can then add any data you want to send to the server in the form of name-value pairs, files, or JSON objects. You can also set headers for the request if needed.

Once you have set up the HttpPost object, you can execute the request using an instance of HttpClient. The server will respond with a response body, which you can read and process as needed.

Example:

HttpPost httpPost = new HttpPost("https://example.com/api/login");

List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", "myusername"));
params.add(new BasicNameValuePair("password", "mypassword"));

httpPost.setEntity(new UrlEncodedFormEntity(params));

HttpResponse response = httpClient.execute(httpPost);
int statusCode = response.getStatusLine().getStatusCode();
String responseBody = EntityUtils.toString(response.getEntity());