Java uses httpclient to call the method of https interface through get and post

It is common to call http through get post of httpclient. 1 is generally

HttpClient client = new DefaultHttpClient(); 
HttpPost post = new HttpPost(http://127.0.0.1/login);

But if you want to call https, this method will not work. DefaultHttpClient will be modified

<dependency>
 <groupId>org.apache.httpcomponents</groupId>
 <artifactId>httpclient</artifactId>
 <version>4.5.5</version>
</dependency>

<dependency>
 <groupId>com.alibaba</groupId>
 <artifactId>fastjson</artifactId>
 <version>1.2.47</version>
</dependency>

Import the package first

Then override the class of DefaultHttpClient

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;

public class SSLClient extends DefaultHttpClient {
 public SSLClient() throws Exception{
  super();
  SSLContext ctx = SSLContext.getInstance("TLS");
  X509TrustManager tm = new X509TrustManager() {
    @Override
    public void checkClientTrusted(X509Certificate[] chain,
      String authType) throws CertificateException {
    }
    @Override
    public void checkServerTrusted(X509Certificate[] chain,
      String authType) throws CertificateException {
    }
    @Override
    public X509Certificate[] getAcceptedIssuers() {
     return null;
    }
  };
  ctx.init(null, new TrustManager[]{tm}, null);
  SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
  ClientConnectionManager ccm = this.getConnectionManager();
  SchemeRegistry sr = ccm.getSchemeRegistry();
  sr.register(new Scheme("https", 443, ssf));
 }
}

At this time, you can call it in https mode

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.message.BasicHeader;
import org.apache.http.util.EntityUtils;

public class HttpClientUtil {

 public static String doGet(String url,String charset) throws Exception{
  HttpClient httpClient = null;
  HttpGet Httpget = null;
  String result = null;

   httpClient = new SSLClient();
   Httpget = new HttpGet(url);
   Httpget.addHeader("Content-Type", "application/json");
   HttpGet.setEntity(se);
   HttpResponse response = httpClient.execute(Httpget);
   if(response != null){
    HttpEntity resEntity = response.getEntity();
    if(resEntity != null){
     result = EntityUtils.toString(resEntity,charset);
    }
   }

  return result;
 }
 public static String doPost(String url,String json,String charset) throws Exception{
  HttpClient httpClient = null;
  HttpPost HttpPost = null;
  String result = null;

   httpClient = new SSLClient();
   HttpPost = new HttpPost(url);
   HttpPost.addHeader("Content-Type", "application/json");
   StringEntity se = new StringEntity(json);
   se.setContentType("text/json");
   se.setContentEncoding(new BasicHeader("Content-Type", "application/json"));
   HttpPost.setEntity(se);
   HttpResponse response = httpClient.execute(HttpPost);
   if(response != null){
    HttpEntity resEntity = response.getEntity();
    if(resEntity != null){
     result = EntityUtils.toString(resEntity,charset);
    }
   }

  return result;
 }	
}

post calling code

public static void main(String[] args) throws Exception{ 
  String url = "https://127.0.0.1/getuser";
  String json = "{\"id\":1}";
  String str = HttpClientUtil.doPost(url, json, "utf-8");
  System.out.println(str);
 }

get calling code

public static void main(String[] args) throws Exception{ 
  String url = "https://127.0.0.1/getuser?id=1";
  String str = HttpClientUtil.doPost(url, "utf-8");
  System.out.println(str);
 }

StringEntity Parameter Description
se. setContentEncoding (new BasicHeader ("Content-Type", "application/json"));
The json mode is used, so the format of transmission is json

application/xhtml+xml: XHTML Format
application/xml: XML data format
application/atom+xml: Atom XML Aggregation Format
application/json: JSON data format
application/pdf: pdf Format
application/msword: Word Document Format
application/octet-stream: Binary stream data (such as common file downloads)
application/x-www-form-urlencoded: The default encType, form form data is encoded to the key/value format and sent to the server (the default submission data format for the form)

HttpPost.addHeader("Content-Type", " application/x-www-form-urlencoded");
List<NameValuePair> params=new ArrayList<>();
params.add(new BasicNameValuePair("key1","value1"));
params.add(new BasicNameValuePair("key2","value2"));
params.add(new BasicNameValuePair("key3","value3"));
UrlEncodedFormEntity entity=new UrlEncodedFormEntity(params,"UTF-8");
HttpPost.setEntity(entity);

If you want to adopt the form submission method, you need to modify it to the method described above.