JAVA发送HTTP请求访问接口GET请求和POST请求

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
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;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * @author ShouSi
 * @Title: HTTPS
 * @date 2021/6/16 9:56
 */
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));
    }

    /**
     * get请求
     * @param url
     * @return
     */
    public static String doGet(String url){
        StringBuffer buffer = new StringBuffer();
        try {

            URL getUrl = new URL(url);
            HttpURLConnection httpUrlConn = (HttpURLConnection) getUrl.openConnection();

            httpUrlConn.setDoOutput(false);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);

            httpUrlConn.setRequestMethod("GET");
            httpUrlConn.connect();

            // 将返回的输入流转换成字符串
            InputStream inputStream = httpUrlConn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            // 释放资源
            inputStream.close();
            inputStream = null;
            httpUrlConn.disconnect();

        } catch (Exception e) {
            e.printStackTrace();
        }

        return buffer.toString();

    }

    /**
     * post请求
     * @param url        链接地址
     * @param map        参数
     * @param charset     字符编码
     * @return
     */
    public static String doPost(String url, Map<String,String> map, String charset){
        HttpClient httpClient = null;
        HttpPost httpPost = null;
        String result = null;
        try{
            httpClient = new SSLClient();
            httpPost = new HttpPost(url);
            //设置参数
            List<NameValuePair> list = new ArrayList<NameValuePair>();
            Iterator iterator = map.entrySet().iterator();
            while(iterator.hasNext()){
                Map.Entry<String,String> elem = (Map.Entry<String, String>) iterator.next();
                list.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));
            }
            if(list.size() > 0){
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);
                httpPost.setEntity(entity);
            }
            HttpResponse response = httpClient.execute(httpPost);
            if(response != null){
                HttpEntity resEntity = response.getEntity();
                if(resEntity != null){
                    result = EntityUtils.toString(resEntity,charset);
                }
            }
        }catch(Exception ex){
            ex.printStackTrace();
        }
        return result;
    }
}

String url = "https://openapi.com";
String method = "/token/create";

// 以下是请求
String app_key = "123123";
String timestamp = "2021-7-20 09:28:34";

// 拼接  https://xxxxx.com/aaa/bbb?xxx=xxx&xxx=xxx
// 因为时间戳 timestamp 中有空格，所以使用URLEncoder.encode转码
StringBuffer urlBuffer = new StringBuffer();
urlBuffer.append(url).append(method).append("?")
            .append("app_key=").append(appkey).append("&")
            .append("timestamp=")
            .append(URLEncoder.encode(timestamp,"utf-8"));

String strResult = SSLClient.doGet(urlBuffer.toString());

String url = "https://openapi.com";
Strng method = "/token/create";

// 以下是请求参数
String app_key = "123123";
String timestamp = "2021-7-20 09:36:43";

Map<String,String> createMap = new HashMap<String,String>();
createMap.put("app_key",appkey);
createMap.put("timestamp",timestamp);

String strResult = SSLClient.doPost(url+method,createMap,"UTF-8");