HTTP请求客户端工具类

1.maven 引入依赖

<dependency>
    <groupId>commons-httpclient</groupId>
    <artifactId>commons-httpclient</artifactId>
    <version>3.1</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.4</version>
</dependency>

2.HTTP请求客户端工具类代码

package com.vx.springbootexcel.common.utils;

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.commons.httpclient.params.HttpConnectionManagerParams;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.lang3.StringUtils;
import org.hibernate.validator.internal.util.StringHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.zip.GZIPInputStream;

/**
 * HTTP请求客户端工具类
 *
 * @author yaojz
 * @version 1.0
 */
public class HttpClientUtil {

   // protected static InnerLogger logger = new GpLoggerWrapper().new InnerLogger(HttpClientUtil.class);
    private static Logger logger = LoggerFactory.getLogger(HttpClientUtil.class);
    private static HttpClient httpClient;
    private static int HTTP_TIMEOUT = 60000;

    private HttpClientUtil() {
    }

    private final static HttpClient getInstance() {
        if (httpClient == null) {
            MultiThreadedHttpConnectionManager connectionManager = new MultiThreadedHttpConnectionManager();
            HttpConnectionManagerParams params = new HttpConnectionManagerParams();
            params.setConnectionTimeout(HTTP_TIMEOUT);
            params.setSoTimeout(HTTP_TIMEOUT);
            params.setMaxTotalConnections(10000);
            params.setDefaultMaxConnectionsPerHost(1000);
            connectionManager.setParams(params);
            httpClient = new HttpClient(connectionManager);
            httpClient.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(3, true));
        }
        return httpClient;
    }

    /**
     * 通过HTTP协议请求
     *
     * @param url        不能为空
     * @param parameters 可为空
     * @return 目标地址响应内容
     * @throws Exception 网络异常
     */
    public static String getRequest_ResponseBodyAsString(String url, Map<String, String> parameters) throws Exception {
        if (url == null) {
            logger.warn(" the url is null");
            return "";
        }
        String params = parameterToString(parameters, "utf-8");
        logger.debug("HttpGet请求:" + url + (params != null ? url.contains("?") ? "&" + params : "?" + params : ""));
        GetMethod method = new GetMethod(url + (params != null ? url.contains("?") ? "&" + params : "?" + params : ""));
        int statusCode;
        try {
            // method.addRequestHeader("Accept-Encoding", "gzip, deflate");
            statusCode = HttpClientUtil.getInstance().executeMethod(method);
            if (statusCode != HttpStatus.SC_OK) {
                logger.error("Method failed: " + method.getStatusLine());
                throw new Exception("请求的服务器有异常:服务器状态码为" + statusCode);
            }
            if (method.getResponseHeader("Content-Encoding") != null) {
                String acceptEncoding = method.getResponseHeader("Content-Encoding").getValue();
                if (acceptEncoding.toLowerCase().indexOf("gzip") > -1) {
                    // 建立gzip解压工作流
                    StringBuffer sb = new StringBuffer();
                    InputStream is = method.getResponseBodyAsStream();
                    GZIPInputStream gzin = new GZIPInputStream(is);
                    InputStreamReader isr = new InputStreamReader(gzin); // 设置读取流的编码格式
                    // ，
                    // 自定义编码
                    BufferedReader br = new BufferedReader(isr);
                    String tempbf;
                    while ((tempbf = br.readLine()) != null) {
                        sb.append(tempbf);
                        sb.append("\r\n");
                    }
                    isr.close();
                    gzin.close();
                    return sb.toString();
                }

            }
            return method.getResponseBodyAsString();
        } catch (Throwable e) {
            throw new Exception("Http服务链路异常:" + e.getMessage(), e);
        } finally {
            method.releaseConnection();
        }
    }

    public static String streamRequest_ResponseBodyAsString(String url, String param) throws Exception {
        if (StringHelper.isNullOrEmptyString(url)) {
            logger.warn(" the url is null");
            return "";
        }
        logger.debug("Http写流请求:" + url + (param != null ? url.contains("?") ? "&" + param : "?" + param : ""));
        OutputStream out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("Content-Length", "" + Integer.toString(param.getBytes().length));
            conn.setRequestProperty("Content-Type", "text/xml;charset=utf8");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestMethod("POST");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setReadTimeout(60000);
            conn.setConnectTimeout(60000);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = conn.getOutputStream();
            // 发送请求参数
            out.write(param.getBytes("UTF-8"));
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += "\n" + line;
            }
            conn.disconnect();
        } catch (Throwable e) {
            throw new Exception("Http服务链路异常:" + e.getMessage(), e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                logger.error(e.getMessage(), e);
            }
        }
        return result;
    }

    public static String postRequest_ResponseBodyAsString(String url, Map<String, String> parameters) throws Exception {
        if (StringHelper.isNullOrEmptyString(url)) {
            logger.warn(" the url is null");
            return "";
        }
        logger.debug("HttpPost请求:" + url + (parameters != null ? url.contains("?") ? "&" + parameters : "?" + parameters : ""));

        PostMethod method = new PostMethod(url);
        int statusCode;
        try {
            for (String key : parameters.keySet()) {
                method.addParameter(key, parameters.get(key));
            }
            method.addRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
            statusCode = HttpClientUtil.getInstance().executeMethod(method);
            if (statusCode != HttpStatus.SC_OK) {
                logger.error("Method failed: " + method.getStatusLine());
                throw new Exception("Http服务链路异常:服务器状态码为" + statusCode);
            }
            return method.getResponseBodyAsString();
        } catch (Throwable e) {
            throw new Exception("Http服务链路异常:" + e.getMessage(), e);
        } finally {
            method.releaseConnection();
        }
    }

    /**
     * 以POST方式发送请求
     *
     * @param url
     * @param parameters
     * @return 返回字节内容
     * @throws Exception
     */
    public static byte[] postRequest_ResponseBodyAsBytes(String url, Map<String, String> parameters) throws Exception {
        logger.debug("HttpPost请求:" + url + (parameters != null ? url.contains("?") ? "&" + parameters : "?" + parameters : ""));
        PostMethod method = new PostMethod(url);
        int statusCode;
        try {
            for (String key : parameters.keySet()) {
                method.addParameter(key, parameters.get(key));
            }
            method.addRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
            // method.setRequestHeader("Accept-Encoding", "gzip, deflate");
            statusCode = httpClient.executeMethod(method);
            if (statusCode != HttpStatus.SC_OK) {
                logger.error("Method failed: " + method.getStatusLine());
                throw new Exception("Http服务链路异常:服务器状态码为" + statusCode);
            }
            return method.getResponseBody();
        } catch (Throwable e) {
            throw new Exception("Http服务链路异常:" + e.getMessage(), e);
        } finally {
            // Release the connection.
            method.releaseConnection();
        }
    }

    /**
     * 以POST方式发送请求
     *
     * @param url
     * @param parameters
     * @return 返回流
     * @throws Exception
     */
    public static InputStream postRequest_ResponseBodyAsStream(String url, Map<String, String> parameters) throws Exception {
        logger.debug("HttpPost请求:" + url + (parameters != null ? url.contains("?") ? "&" + parameters : "?" + parameters : ""));
        PostMethod method = new PostMethod(url);
        int statusCode;
        try {
            for (String key : parameters.keySet()) {
                method.addParameter(key, parameters.get(key));
            }
            method.addRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
            // method.setRequestHeader("Accept-Encoding", "gzip, deflate");
            statusCode = httpClient.executeMethod(method);
            if (statusCode != HttpStatus.SC_OK) {
                logger.error("Method failed: " + method.getStatusLine());
                throw new Exception("Http服务链路异常:服务器状态码为" + statusCode);
            }
            return method.getResponseBodyAsStream();
        } catch (Throwable e) {
            throw new Exception("Http服务链路异常:" + e.getMessage(), e);
        } finally {
            // Release the connection.
            method.releaseConnection();
        }
    }

    // 对参数编码组合成一个get请求参数串
    private static String parameterToString(Map<String, String> parameters, String input_charset) {
        if (parameters != null) {
            StringBuffer result = new StringBuffer();
            List<String> keys = new ArrayList<String>(parameters.keySet());
            for (int i = 0; i < keys.size(); i++) {
                try {
                    String key = (String) keys.get(i);
                    String value = (String) parameters.get(key);
                    if (i == keys.size() - 1) {
                        result.append(key).append("=").append(URLEncoder.encode(value, input_charset));
                    } else {
                        result.append(key).append("=").append(URLEncoder.encode(value, input_charset)).append("&");
                    }
                } catch (UnsupportedEncodingException e) {
                    logger.error(e.getMessage(), e);
                }
            }
            return result.toString();
        }
        return null;
    }

    /**
     * 通过HTTP协议请求
     *
     * @param url      不能为空
     * @param postBody 不能为空
     * @param tokenId
     * @return 目标地址响应内容
     * @throws Exception 网络异常
     */
    public static String postJSONRequest(String url, String postBody,String tokenId) throws Exception {
        if (StringHelper.isNullOrEmptyString(url)) {
            logger.warn(" the url is null");
            return "";
        }
        logger.debug("HttpPost请求:" + url + postBody);
        PostMethod method = new PostMethod();
        try {
            method.setURI(new URI(url, true, "UTF-8"));
        } catch (URIException e1) {
            throw new Exception("解析URL出错:" + url);
        } catch (NullPointerException e1) {
            throw new Exception("解析URL出错:" + url);
        }
        method.setRequestHeader("Content-type", "application/json; charset=UTF-8");
        if(StringUtils.isNotBlank(tokenId)){
            method.setRequestHeader("tokenId", tokenId);
        }
        RequestEntity requestEntity = new StringRequestEntity(postBody);
        method.setRequestEntity(requestEntity);
        int statusCode;
        try {
            statusCode = HttpClientUtil.getInstance().executeMethod(method);
            if (statusCode != HttpStatus.SC_OK) {
                logger.error("Method failed: " + method.getStatusLine());
                throw new Exception("请求的服务器有异常:服务器状态码为" + statusCode);
            }
            BufferedReader in = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), method.getResponseCharSet()));
            StringBuffer sb = new StringBuffer();
            int chari2;
            while ((chari2 = in.read()) != -1) {
                sb.append((char) chari2);
            }
            return sb.toString();
        } catch (Throwable e) {
            throw new Exception("Http服务链路异常:" + e.getMessage(), e);
        } finally {
            if (method != null) {
                method.releaseConnection();
            }
        }
    }

    public static String streamRequest_ResponseBodyAsStringWithUTF8(String url, String param) throws Exception {
        if (StringHelper.isNullOrEmptyString(url)) {
            logger.warn(" the url is null");
            return "";
        }
        logger.debug("Http写流请求:" + url + (param != null ? url.contains("?") ? "&" + param : "?" + param : ""));
        OutputStream out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("Content-Length", "" + Integer.toString(param.getBytes().length));
            conn.setRequestProperty("Content-Type", "text/xml;charset=utf8");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestMethod("POST");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setReadTimeout(60000);
            conn.setConnectTimeout(60000);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = conn.getOutputStream();
            // 发送请求参数
            out.write(param.getBytes("UTF-8"));
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += "\n" + line;
            }
            conn.disconnect();
        } catch (Throwable e) {
            throw new Exception("Http服务链路异常:" + e.getMessage(), e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                logger.error(e.getMessage(), e);
            }
        }
        return result.trim();
    }

}