问题背景

有时候不是任何网络都可以访问自己的程序，自己也不能随意访问外网，做安全隔离，但有时确实需要与外面交互，这个时候就需要使用外网代理了
注意事项：

代码可以复用上一篇文章，添加一点小改动就行了

HttpClient工具类调用url实例，附源码（一）

HttpClient内外访问外网，添加代理（二）

项目搭建

1 在httpclient工具类中添加代理

/** Copyright 2019 The FATE Authors. All Rights Reserved.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**     http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/
package com.yg.thirdtest.utils;import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
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.client.methods.HttpRequestBase;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicHeader;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Service;import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.util.Map;@Service
@Slf4j
public class HttpClientPoolUtil implements InitializingBean {private PoolingHttpClientConnectionManager poolConnManager;private RequestConfig requestConfig;private CloseableHttpClient httpClient;private static void config(HttpRequestBase httpRequestBase) {RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(20000).setConnectTimeout(20000).setSocketTimeout(20000).build();httpRequestBase.addHeader("Content-Type", "application/json;charset=UTF-8");httpRequestBase.setConfig(requestConfig);}private void initPool() {try {SSLContextBuilder builder = new SSLContextBuilder();builder.loadTrustMaterial(null, new TrustSelfSignedStrategy());SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(builder.build());Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create().register("http", PlainConnectionSocketFactory.getSocketFactory()).register("https", sslsf).build();poolConnManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);poolConnManager.setMaxTotal(500);poolConnManager.setDefaultMaxPerRoute(500);int socketTimeout = 1200000;int connectTimeout = 100000;int connectionRequestTimeout = 100000;HttpHost proxy = new HttpHost("172.16.12.144", 1118);requestConfig = RequestConfig.custom().setConnectionRequestTimeout(connectionRequestTimeout).setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).setProxy(proxy).build();
//            requestConfig = RequestConfig.custom().setConnectionRequestTimeout(
//                    connectionRequestTimeout).setSocketTimeout(socketTimeout).setConnectTimeout(
//                    connectTimeout).build();httpClient = getConnection();} catch (NoSuchAlgorithmException | KeyStoreException | KeyManagementException e) {e.printStackTrace();}}private CloseableHttpClient getConnection() {CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(poolConnManager).setDefaultRequestConfig(requestConfig).setRetryHandler(new DefaultHttpRequestRetryHandler(2, false)).build();return httpClient;}public JSONObject postForJsonObject(String url, String jsonStr) {log.debug("url = " + url + " ,  json = " + jsonStr);long start = System.currentTimeMillis();CloseableHttpResponse response = null;try {// 创建httpPostHttpPost httpPost = new HttpPost(url);httpPost.setHeader("Accept", "application/json");StringEntity entity = new StringEntity(jsonStr, "UTF-8");entity.setContentType("application/json");entity.setContentEncoding(new BasicHeader("Content-Type", "application/json"));httpPost.setEntity(entity);//发送post请求response = httpClient.execute(httpPost);if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {JSONObject result = JSONObject.parseObject(EntityUtils.toString(response.getEntity()));log.debug("request success cost = {}， result = {}", System.currentTimeMillis() - start, result);return result;} else {log.error("bad response: {}", JSONObject.parseObject(EntityUtils.toString(response.getEntity())));}} catch (Exception e) {log.error("=============[\"异常\"]======================, e: {}", e);} finally {if (response != null) {try {response.close();} catch (IOException e) {e.printStackTrace();}}}return null;}public String post(String url, Map<String, Object> requestData) {HttpPost httpPost = new HttpPost(url);config(httpPost);StringEntity stringEntity = new StringEntity(JSON.toJSONString(requestData), "UTF-8");stringEntity.setContentEncoding(StandardCharsets.UTF_8.toString());httpPost.setEntity(stringEntity);return getResponse(httpPost);}public JSONArray post(String url, String jsonStr) {log.debug("url = " + url + " ,  json = " + jsonStr);long start = System.currentTimeMillis();CloseableHttpResponse response = null;JSONArray result = new JSONArray();try {// 创建httpPostHttpPost httpPost = new HttpPost(url);httpPost.setHeader("Accept", "application/json");StringEntity entity = new StringEntity(jsonStr, StandardCharsets.UTF_8.toString());entity.setContentType("application/json");entity.setContentEncoding(new BasicHeader("Content-Type", "application/json"));httpPost.setEntity(entity);//发送post请求response = httpClient.execute(httpPost);if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {result = JSONObject.parseArray(EntityUtils.toString(response.getEntity()));log.debug("request success cost = {}， result = {}", System.currentTimeMillis() - start, result);return result;} else {log.error("bad response, result: {}", EntityUtils.toString(response.getEntity()));}} catch (Exception e) {log.error("=============[\"异常\"]======================, e: {}", e);} finally {if (response != null) {try {response.close();} catch (IOException e) {e.printStackTrace();}}}return result;}public String get(String url) {HttpGet httpGet = new HttpGet(url);config(httpGet);return getResponse(httpGet);}private String getResponse(HttpRequestBase request) {CloseableHttpResponse response = null;try {response = httpClient.execute(request,HttpClientContext.create());HttpEntity entity = response.getEntity();String result = EntityUtils.toString(entity, StandardCharsets.UTF_8.toString());EntityUtils.consume(entity);return result;} catch (IOException e) {log.error("send http error", e);return "";} finally {try {if (response != null) {response.close();}} catch (IOException e) {e.printStackTrace();}}}@Overridepublic void afterPropertiesSet() throws Exception {initPool();}
}

主要就是这几行进行更改

            HttpHost proxy = new HttpHost("172.16.12.144", 1118);requestConfig = RequestConfig.custom().setConnectionRequestTimeout(connectionRequestTimeout).setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).setProxy(proxy).build();