http和https工具类 （要注意httpclient版本号和log4j的版本号）

HTTPS 其实就是 HTTP + SSL/TLS 的合体，它其实还是 HTTP 协议，只是在外面加了一层，SSL 是一种加密安全协议

引入 SSL 的目的是为了解决 HTTP 协议在不可信网络中使用明文传输数据导致的安全性问题

SSL/TLS协议及其握手过程

在 SSL/TLS 握手的过程中，客户端和服务器彼此交换并验证证书，并协商出一个 “对话密钥” ，后续的所有通信都使用这个 “对话密钥” 进行加密，保证通信安全

1 打招呼
当用户通过浏览器访问 HTTPS 站点时，浏览器会向服务器打个招呼，服务器也会和浏览器打个招呼。所谓的打招呼，实际上是告诉彼此各自的 SSL/TLS 版本号以及各自支持的加密算法等，让彼此有一个初步了解

2 表明身份、验证身份
第二步是整个过程中最复杂的一步，也是 HTTPS 通信中的关键。为了保证通信的安全，首先要保证我正在通信的人确实就是那个我想与之通信的人，服务器会发送一个证书来表明自己的身份，浏览器根据证书里的信息进行核实。如果是双向认证的话，浏览器也会向服务器发送客户端证书
双方的身份都验证没问题之后，浏览器会和服务器协商出一个 “对话密钥”

3 通信
至此，握手就结束了。双方开始聊天，并通过 “对话密钥” 加密通信的数据。

1 工具类

package dd.com;

import java.io.IOException;
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;
import java.util.Map.Entry;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

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.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
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.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class HttpUtils {

    private static RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(15000).setConnectTimeout(15000)
            .setConnectionRequestTimeout(15000).build();

    public static String sendHttpGet(String url) {
        HttpGet httpGet = new HttpGet(url);
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        HttpEntity entity = null;
        String responseContent = null;
        try {
            // 创建默认的httpClient实例.
            httpClient = HttpClients.createDefault();
            httpGet.setConfig(requestConfig);

            // 执行请求
            response = httpClient.execute(httpGet);
            entity = response.getEntity();
            responseContent = EntityUtils.toString(entity, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭连接,释放资源
                if (response != null) {
                    response.close();
                }
                if (httpClient != null) {
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseContent;
    }

    /**
     * 发送 post请求
     *
     * @param httpUrl 地址
     * @param maps    参数
     */
    public static String sendHttpPost(String httpUrl, Map<String, String> maps) {
        HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
        // 创建参数队列
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
        for (String key : maps.keySet()) {
            nameValuePairs.add(new BasicNameValuePair(key, maps.get(key)));
        }
        try {
            httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
        } catch (Exception e) {
            e.printStackTrace();
        }

        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        HttpEntity entity = null;
        String responseContent = null;
        try {
            // 创建默认的httpClient实例.
            httpClient = HttpClients.createDefault();
            httpPost.setConfig(requestConfig);
            // 执行请求
            response = httpClient.execute(httpPost);
            entity = response.getEntity();
            responseContent = EntityUtils.toString(entity, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭连接,释放资源
                if (response != null) {
                    response.close();
                }
                if (httpClient != null) {
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseContent;
    }

    @SuppressWarnings("unchecked")
    public static String sendHttpsPost(String url, Map<String, String> map, String charset) {
        if (null == charset) {
            charset = "utf-8";
        }
        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()) {
                Entry<String, String> elem = (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;
    }

    public static String sendHttpsGet(String url, String charset) {
        if (null == charset) {
            charset = "utf-8";
        }
        HttpClient httpClient = null;
        HttpGet httpGet = null;
        String result = null;

        try {
            httpClient = new SSLClient();
            httpGet = new HttpGet(url);

            HttpResponse response = httpClient.execute(httpGet);
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    result = EntityUtils.toString(resEntity, charset);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return result;
    }

    public static 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));
        }
    }
}

2  maven 依赖 和 jdk 编译版本

3 依赖的jar包