目录
okhttp3及httpclient中的代理设置
在java工程开发过程中，如果需要向外发送网络请求，但是开发过程中网络不通，我们需要通过vpn的方式代理发起请求。又或者需要使用ip池来进行网络爬取，也得通过ip代理来规避ip封禁。
这里，给出了两种常用的http客户端三方类库——okhttp3和httpclient的代理设置
okhttp3代理设置
public class OkHttpUtil { private OkHttpClient client; private X509TrustManager x509TrustManager() { return new X509TrustManager() { @Override public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {} @Override public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {} @Override public X509Certificate[] getAcceptedIssuers() { return new X509Certificate[0]; } }; } private SSLSocketFactory sslSocketFactory() { try { SSLContext sslContext = SSLContext.getInstance("TLS"); sslContext.init(null, new TrustManager[] {x509TrustManager()}, new SecureRandom()); return sslContext.getSocketFactory(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (KeyManagementException e) { e.printStackTrace(); } return null; } private OkHttpUtil() { final String username = "xxx"; final String password = "yyy"; Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("ipAdress", 8080)); Authenticator proxyAuthenticator = new Authenticator() { @Override public Request authenticate(Route route, Response response) throws IOException { String credential = Credentials.basic(username, password); return response.request().newBuilder() .header("Proxy-Authorization", credential) .build(); } }; client = new OkHttpClient.Builder() .addInterceptor(new CommonInterceptor()) .retryOnConnectionFailure(false)//是否开启缓存 .connectionPool(pool())//连接池 .connectTimeout(10L, TimeUnit.SECONDS) .readTimeout(10L, TimeUnit.SECONDS) .sslSocketFactory(sslSocketFactory(), x509TrustManager()) .proxy(proxy) .proxyAuthenticator(proxyAuthenticator) .authenticator(proxyAuthenticator) .build(); } // todo 使用client对象进行执行request请求 // client.newCall(request).execute(); }相较于正常使用，在build的过程中，设置了proxy及proxyAuthenticator。如果代理过程中ssl或tls相关的错误，则需要加上sslSocketFactory(sslSocketFactory(), x509TrustManager())来处理证书验证，这里默认的处理模式是全部放通，仅用于开发调测阶段。
注：在okhttp3代理设置中，如果通过 java.net.Authenticator.setDefault的方式来设置net全局代理，会报错代理鉴权失败。
httphlient代理设置
HttpClientBuilder custom = HttpClients.custom(); //设置代理服务器 HttpHost proxy = new HttpHost("proxy.huawei.com", 8080); DefaultProxyRoutePlanner routePlanner = new DefaultProxyRoutePlanner(proxy); custom.setRoutePlanner(routePlanner); //设置代理认证 CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); credentialsProvider.setCredentials(new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT), new UsernamePasswordCredentials("账号", "密码")); custom.setDefaultCredentialsProvider(credentialsProvider); SSLContext sslContext = null; try { sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() { // 信任所有 public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException { return true; } }).build(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (KeyManagementException e) { e.printStackTrace(); } catch (KeyStoreException e) { e.printStackTrace(); } SSLConnectionSocketFactory sslf = new SSLConnectionSocketFactory(sslContext); CloseableHttpClient httpClient = custom.setSSLSocketFactory(sslf).build(); // todo 使用httpClient对象进行执行request请求 // httpClient.execute(httpRequest).getEntity()同理，相较于正常使用，额外设置了proxy的路由及鉴权：custom.setRoutePlanner(routePlanner);custom.setDefaultCredentialsProvider(credentialsProvider); 如果代理过程中ssl或tls相关的错误，则需要通过custom.setSSLSocketFactory来处理证书验证，这里默认的处理模式是全部放通，仅用于开发调测阶段。
总结：
通过http客户端三方类库，主要有三步。
1. 设置proxy的地址信息
2. 设置proxy的鉴权信息
3. 如果证书错误，则需要设置sslSocketFactory来处理证书验证。