直接上代码：

HttpUrlConnection使用代理：

private static HttpURLConnection getConnection(URL url, String method, String ctype)
throws IOException {
HttpURLConnection conn;
if (hasProxy) {
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
conn = (HttpURLConnection)url.openConnection(proxy);
} else {
conn = (HttpURLConnection) url.openConnection();
}
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod(method);
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("Connection", "Keep-Alive");
return conn;
}

https：

private static HttpsURLConnection getConnectionHttps(URL url, String method, String ctype)
throws IOException {

SSLContext sslContext = null;
try {
sslContext = SSLContext.getInstance("TLS"); // 或SSL
X509TrustManager[] xtmArray = new X509TrustManager[]{new myX509TrustManager()};
sslContext.init(null, xtmArray, new java.security.SecureRandom());
} catch (GeneralSecurityException e) {
e.printStackTrace();
}
if (sslContext != null) {
HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
}
HttpsURLConnection.setDefaultHostnameVerifier(new myHostnameVerifier());
HttpsURLConnection conn;
if (hasProxy) {
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
conn = (HttpsURLConnection)url.openConnection(proxy);
} else {
conn = (HttpsURLConnection) url.openConnection();
}
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod(method);
conn.setRequestProperty("Content-Type", ctype);
conn.setRequestProperty("Connection", "Keep-Alive");
return conn;
}

httpClent:

RequestConfig requestConfig = null;
if(StringUtil.isEmpty(proxyHost)){
requestConfig = RequestConfig.custom()
.setSocketTimeout(connectTimeout)
.setConnectTimeout(connectTimeout)
.build();
}else{ //代理
HttpHost proxy = new HttpHost(proxyHost,proxyPort);
requestConfig = RequestConfig.custom()
.setProxy(proxy)
.setSocketTimeout(connectTimeout)
.setConnectTimeout(connectTimeout)
.build();
}

共同代码：

private static String proxyHost;
private static int proxyPort;
private static boolean hasProxy = false;

public void setProxy(String proxyHost,int proxyPort) {
this.proxyHost = proxyHost;
this.proxyPort = proxyPort;
hasProxy = true;
}