java5增加對https的支持

jdk1.5不支持http協議，jdk1.8默認支持，比較好的解決方案是升級jdk，但是升級jdk風險極大。不能升級jdk的情況下，可以使用如下方式。

利用httpclient,進行封裝，從而實現對https的get和post請求

 

import org.apache.commons.collections.MapUtils;
import org.apache.commons.lang3.StringUtils;
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.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.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

/**
 * jdk1.5中沒有封裝好的包來請求https，所以這里做了一層封裝,可以實現以下類型的請求
 * http post
 * http get
 * https post
 * https get
 *
 * @author qianhongwei
 */
public class HttpUtils {
    private static final Logger logger = LoggerFactory.getLogger(HttpUtils.class);

    /**
     * 定義類型，用於獲取不同類型的httpclient
     */
    enum CLIENT_TYPE {
        HTTP, HTTPS
    }

    /**
     * https post請求
     *
     * @param url        請求地址
     * @param headerMap  請求頭信息
     * @param contentMap 請求體信息
     * @return 結果返回
     */
    public static String httpsPost(String url, Map<String, String> headerMap, Map<String, String> contentMap) {
        return httpsPost(url, headerMap, contentMap, "UTF-8");
    }

    /**
     * http post請求
     *
     * @param url        請求地址
     * @param headerMap  請求頭信息
     * @param contentMap 請求體信息
     * @return 結果返回
     */
    public static String httpPost(String url, Map<String, String> headerMap, Map<String, String> contentMap) {
        return httpPost(url, headerMap, contentMap, "UTF-8");
    }

    /**
     * https get請求
     *
     * @param url      請求地址
     * @param paramMap 請求參數
     * @return 結果返回
     */
    public static String httpsGet(String url, Map<String, String> paramMap) {
        return httpsGet(url, paramMap, "UTF-8");
    }

    /**
     * http get請求
     *
     * @param url      請求地址
     * @param paramMap 請求參數
     * @return 結果返回
     */
    public static String httpGet(String url, Map<String, String> paramMap) {
        return httpGet(url, paramMap, "UTF-8");
    }

    /**
     * @param url        請求地址
     * @param headerMap  請求頭信息
     * @param contentMap 請求體信息
     * @param charset    編碼類型
     * @return 結果返回
     */
    public static String httpsPost(String url, Map<String, String> headerMap, Map<String, String> contentMap, String charset) {
        return post(url, headerMap, contentMap, charset, CLIENT_TYPE.HTTPS);
    }

    /**
     * @param url        請求地址
     * @param headerMap  請求頭信息
     * @param contentMap 請求體信息
     * @param charset    編碼類型
     * @return 結果返回
     */
    public static String httpPost(String url, Map<String, String> headerMap, Map<String, String> contentMap, String charset) {
        return post(url, headerMap, contentMap, charset, CLIENT_TYPE.HTTP);
    }

    /**
     * @param url      請求地址
     * @param paramMap 請求參數
     * @param charset  編碼類型
     * @return 結果返回
     */
    public static String httpsGet(String url, Map<String, String> paramMap, String charset) {
        return get(url, paramMap, charset, CLIENT_TYPE.HTTPS);
    }

    /**
     * @param url      請求地址
     * @param paramMap 請求參數
     * @param charset  編碼類型
     * @return 結果返回
     */
    public static String httpGet(String url, Map<String, String> paramMap, String charset) {
        return get(url, paramMap, charset, CLIENT_TYPE.HTTP);
    }

    /**
     * post 請求的實際方法
     *
     * @param url        請求地址
     * @param headerMap  請求頭信息
     * @param contentMap 請求體信息
     * @param charset    編碼類型
     * @param type       協議類型
     * @return 結果返回
     */
    private static String post(String url, Map<String, String> headerMap, Map<String, String> contentMap, String charset, CLIENT_TYPE type) {
        if (StringUtils.isBlank(url)) {
            throw new RuntimeException("請求url為空");
        }

        String result = null;
        HttpClient httpClient = null;
        try {
            HttpPost post = new HttpPost(url);
            if (MapUtils.isNotEmpty(headerMap)) {// 設置請求頭
                for (Map.Entry<String, String> entry : headerMap.entrySet()) {
                    post.addHeader(entry.getKey(), entry.getValue());
                }
            }

            if (MapUtils.isNotEmpty(contentMap)) {// 設置請求體
                List<NameValuePair> content = getNameValuePairList(contentMap);
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(content, charset);
                post.setEntity(entity);
            }

            httpClient = getClient(type);//這里是重點，根據不同協議獲取不同類型的client端
            HttpResponse response = httpClient.execute(post);//發送請求並接收返回數據
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    result = EntityUtils.toString(resEntity, charset);
                }
            }
            return result;
        } catch (Exception ex) {
            throw new RuntimeException("請求：" + url + " 異常:" + ex.getMessage());
        } finally {
            try {
                if (null != httpClient && null != httpClient.getConnectionManager()) {
                    httpClient.getConnectionManager().shutdown();
                }
            } catch (Exception e) {
                logger.error("請求：" + url + " 流關閉異常或者httpclient關閉異常");
            }
        }
    }

    /**
     * get 請求的實際方法
     *
     * @param url      請求地址
     * @param paramMap 請求參數
     * @param charset  編碼類型
     * @param type     協議類型
     * @return 結果返回
     */
    private static String get(String url, Map<String, String> paramMap, String charset, CLIENT_TYPE type) {
        if (StringUtils.isBlank(url)) {
            throw new RuntimeException("請求url為空");
        }

        String result = null;
        HttpClient httpClient = null;
        try {
            if (MapUtils.isNotEmpty(paramMap)) {// 拼接參數
                // 設置請求體
                List<NameValuePair> content = getNameValuePairList(paramMap);
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(content, charset);
                String params = EntityUtils.toString(entity);
                url = url + "?" + params;
            }

            HttpGet get = new HttpGet(url);
            httpClient = getClient(type);
            HttpResponse response = httpClient.execute(get);            //發送請求並接收返回數據
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    result = EntityUtils.toString(resEntity, charset);
                }
            }
            return result;
        } catch (Exception ex) {
            throw new RuntimeException("請求：" + url + " 異常:" + ex.getMessage());
        } finally {
            try {
                if (null != httpClient && null != httpClient.getConnectionManager()) {
                    httpClient.getConnectionManager().shutdown();
                }
            } catch (Exception e) {
                logger.error("請求：" + url + " 流關閉異常或者httpclient關閉異常");
            }
        }
    }

    private static List<NameValuePair> getNameValuePairList(Map<String, String> paramMap) {
        List<NameValuePair> content = null;
        if (MapUtils.isNotEmpty(paramMap)) {
            // 設置請求體
            content = new ArrayList<NameValuePair>();
            for (Map.Entry<String, String> entry : paramMap.entrySet()) {
                content.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
        }
        return content;
    }

    /**
     * 根據指定類型返回http、https類型的客戶端
     *
     * @param type 類型
     * @return 客戶端
     * @throws Exception 異常信息
     */
    private static DefaultHttpClient getClient(CLIENT_TYPE type) throws Exception {
        if (type == CLIENT_TYPE.HTTP) {//http類型
            return new DefaultHttpClient();
        } else if (type == CLIENT_TYPE.HTTPS) {//https類型
            return new SSLClient();
        } else {
            throw new RuntimeException("未知協議類型，請重新指定");
        }
    }

    /**
     * 自定義SSL client
     */
    static class SSLClient extends DefaultHttpClient {
        public SSLClient() throws Exception {
            super();
            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;
                }
            };
            //傳輸協議需要根據自己的判斷　
            //SSLContext ctx = SSLContext.getInstance("TLSv1.2");
            SSLContext ctx = SSLContext.getInstance("TLS");
            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));
        }
    }

    public static void main(String[] args) {
        //Map<String, String> param = new HashMap<String, String>();
        //param.put("fr", "aladdin");
        //String result = httpsGet("https://baike.baidu.com/item/%E5%89%81%E6%A4%92%E9%B1%BC%E5%A4%B4/1171373", param);

        //String result = httpsGet("https://baike.baidu.com/item/%E5%89%81%E6%A4%92%E9%B1%BC%E5%A4%B4/1171373?fr=aladdin", null);
        //String result = httpGet("http://www.baidu.com",null);

        //System.out.println(result);
    }

}