參考原文：https://blog.csdn.net/weixin_38003389/article/details/88663636

1.匯入依賴

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.8</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.11</version>
<scope>test</scope>
</dependency>

2.相關jar包

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 javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

<----工具類---->
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

3.建立SSLClient類

public class SSLClient extends DefaultHttpClient {

public SSLClient() throws Exception {
super();
//傳輸協議需要根據自己的判斷
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));
}
}
4.傳送請求（兩種）

第一種：傳 json 作為引數

public String doPost(String url, String map, Map<String, String> headMap) {
    org.apache.http.client.HttpClient httpClient = null;
    HttpPost httpPost = null;
    String result = null;
    try {
        httpClient = new SSLClient();
        httpPost = new HttpPost(url);
        //設定引數
        httpPost.addHeader("Accept", "application/json");
        httpPost.addHeader("Content-Type", "application/json;charset=UTF-8");
        // 設定頭部,遍歷headMap
        Iterator<Map.Entry<String, String>> headIterator = headMap.entrySet().iterator();
        while (headIterator.hasNext()) {
            Map.Entry<String, String> headEntry = headIterator.next();
            httpPost.setHeader(headEntry.getKey(), headEntry.getValue());
        }
        StringEntity stringEntity = new StringEntity(map);
        stringEntity.setContentEncoding("UTF-8");
        stringEntity.setContentType("application/json");
        httpPost.setEntity(stringEntity);
        HttpResponse response = httpClient.execute(httpPost);
        if (response != null) {
            HttpEntity resEntity = response.getEntity();
            if (resEntity != null) {
                result = EntityUtils.toString(resEntity, "UTF-8");
            }
        }
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return result;
}
第二種：傳map作為引數

public String doPost(String url, Map<String,String> map, String charset) {
org.apache.http.client.HttpClient httpClient = null;
HttpPost httpPost = null;
String result = null;
try {
httpClient = new SSLClient();
httpPost = new HttpPost(url);
//設定引數
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);
entity.setContentType("application/json");
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "application/json;charset=utf-8");
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;
}