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童刚

2022-08-03 72e72b8733cd2fd063f251bc7450c9e36b01f352

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 src/main/java/com/hz/util/http/dto/HttpClientUtils.java

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package com.hz.util.http.dto;

import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
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.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.TrustStrategy;
import org.apache.http.util.EntityUtils;

import javax.net.ssl.SSLContext;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class HttpClientUtils {

    /** 获取Http客户端 */
    private static final CloseableHttpClient httpClient;
    /** 设置默认编码 */
    public static final String CHARSET = "UTF-8";

    /** 初始化超时时间配置,并配置生成默认httpClient对象 */
    static {
        RequestConfig config = RequestConfig.custom().setConnectTimeout(60000).setSocketTimeout(15000).build();
        httpClient = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
    }

    public static String doGet(String url, Map<String, String> params) {
        return doGet(url, params, CHARSET);
    }

    public static String doPost(String url, Map<String, String> params) {
        return doPost(url, params, CHARSET);
    }

    public static String doGetSSL(String url, Map<String, String> params) {
        return doGetSSL(url, params, CHARSET);
    }

    /**
     * 获取ip地址
     */
    public static String getIp(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        System.out.println("x-forwarded-for ip: " + ip);
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
            // 多次反向代理后会有多个ip值，第一个ip才是真实ip
            if (ip.contains(",")) {
                ip = ip.split(",")[0];
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

    /**
     * HTTP GET获取内容
     *
     * @param url     请求地址
     * @param params  请求参数
     * @param charset 编码(UTF-8)
     * @return String
     */
    public static String doGet(String url, Map<String, String> params, String charset) {
        String result = null;
        if (StringUtils.isBlank(url)) {
            return null;
        }
        //响应模型
        CloseableHttpResponse response = null;
        try {
            //将请求参数拼接url地址后
            if (params != null && !params.isEmpty()) {
                List<NameValuePair> pairs = new ArrayList<NameValuePair>(params.size());
                for (Map.Entry<String, String> entry : params.entrySet()) {
                    String value = entry.getValue();
                    if (value != null) {
                        pairs.add(new BasicNameValuePair(entry.getKey(), value));
                    }
                }
                url += "?" + EntityUtils.toString(new UrlEncodedFormEntity(pairs, charset));
            }
            //创建http get请求
            HttpGet httpGet = new HttpGet(url);
            //由客户端执行get请求
            response = httpClient.execute(httpGet);
            //获取响应状态
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != 200) {
                httpGet.abort();
                throw new RuntimeException("HttpClient,error status code :" + statusCode);
            }
            //从响应模型中获取响应实体
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                result = EntityUtils.toString(entity, charset);
            }
            //关闭HttpEntity流
            EntityUtils.consume(entity);
            return result;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    public static String doPost(String url, String params, String charset) {
        String result = null;
        //响应模型
        CloseableHttpResponse response = null;
        try {
            //创建http post请求
            HttpPost httpPost = new HttpPost(url);
            if (params != null && !"".equals(params)) {
                StringEntity stringEntity = new StringEntity(params);
                stringEntity.setContentType("application/json");
                stringEntity.setContentEncoding(charset);
                httpPost.setEntity(stringEntity);
                //由客户端执行post请求
                response = httpClient.execute(httpPost);
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    result = EntityUtils.toString(entity, charset);
                }
                //关闭HttpEntity流
                EntityUtils.consume(entity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    /**
     * HTTP POST获取内容
     *
     * @param url     请求地址
     * @param params  请求参数
     * @param charset 编码(UTF-8)
     * @return String
     */
    public static String doPost(String url, Map<String, String> params, String charset) {
        String result = null;
        if (StringUtils.isBlank(url)) {
            return null;
        }
        //请求参数
        List<NameValuePair> pairs = null;
        //响应模型
        CloseableHttpResponse response = null;
        try {
            if (params != null && !params.isEmpty()) {
                pairs = new ArrayList<NameValuePair>(params.size());
                for (Map.Entry<String, String> entry : params.entrySet()) {
                    String value = entry.getValue();
                    if (value != null) {
                        pairs.add(new BasicNameValuePair(entry.getKey(), value));
                    }
                }
            }
            //创建http post请求
            HttpPost httpPost = new HttpPost(url);
            if (pairs != null && pairs.size() > 0) {
                httpPost.setEntity(new UrlEncodedFormEntity(pairs, charset));
            }
            //由客户端执行post请求
            response = httpClient.execute(httpPost);
            //获取响应状态
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != 200) {
                httpPost.abort();
                throw new RuntimeException("HttpClient,error status code :" + statusCode);
            }
            //从响应模型中获取响应实体
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                result = EntityUtils.toString(entity, charset);
            }
            //关闭HttpEntity流
            EntityUtils.consume(entity);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    /**
     * HTTPS GET 获取内容
     *
     * @param url     请求的url地址 ?之前的地址
     * @param params  请求的参数
     * @param charset 编码格式
     * @return 页面内容
     */
    public static String doGetSSL(String url, Map<String, String> params, String charset) {
        if (StringUtils.isBlank(url)) {
            return null;
        }
        String result = null;
        CloseableHttpResponse response = null;
        try {
            if (params != null && !params.isEmpty()) {
                List<NameValuePair> pairs = new ArrayList<NameValuePair>(params.size());
                for (Map.Entry<String, String> entry : params.entrySet()) {
                    String value = entry.getValue();
                    if (value != null) {
                        pairs.add(new BasicNameValuePair(entry.getKey(), value));
                    }
                }
                url += "?" + EntityUtils.toString(new UrlEncodedFormEntity(pairs, charset));
            }
            HttpGet httpGet = new HttpGet(url);
            // https  注意这里获取https内容，使用了忽略证书的方式，当然还有其他的方式来获取https内容
            CloseableHttpClient httpsClient = HttpClientUtils.createSSLClientDefault();
            response = httpsClient.execute(httpGet);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != 200) {
                httpGet.abort();
                throw new RuntimeException("HttpClient,error status code :" + statusCode);
            }
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                result = EntityUtils.toString(entity, charset);
            }
            EntityUtils.consume(entity);
            return result;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 这里创建了忽略整数验证的CloseableHttpClient对象
     */
    public static CloseableHttpClient createSSLClientDefault() {
        try {
            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {
                // 信任所有
                public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {
                    return true;
                }
            }).build();
            SSLConnectionSocketFactory ssl = new SSLConnectionSocketFactory(sslContext);
            return HttpClients.custom().setSSLSocketFactory(ssl).build();
        } catch (KeyManagementException | NoSuchAlgorithmException | KeyStoreException e) {
            e.printStackTrace();
        }
        return HttpClients.createDefault();
    }

}