常用的java 发送http请求的方式有两种
1、通过HttpsURLConnection 自己去发送请求
2、 用spring框架提供的 RestTemplate （import org.springframework.web.client.RestTemplate;） 对象发送请求
第一种方式配置代理服务器关键代码:
int PROXY_PORT = 80;// 改成你自己的代理服务器端口String PROXY_HOST = "127.0.0.1";// 改成你自己的代理服务器ip地址 System.setProperty("https.proxyHost", PROXY_HOST); System.setProperty("https.proxyPort", PROXY_PORT);改代码块放置到访问请求之前即可。
第二种方式配置代理服务器：
RestTemplate restTemplate1 = new RestTemplate(); String url = "www.baidu.com";String xmlParam = "xxx";int PROXY_PORT = 80;// 代理服务器端口String PROXY_HOST = "127.0.0.1";Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(PROXY_HOST, PROXY_PORT));SimpleClientHttpRequestFactory httpRequestFactory = new SimpleClientHttpRequestFactory();httpRequestFactory.setProxy(proxy);restTemplate1.setRequestFactory(httpRequestFactory); // 发起请求String strXML = restTemplate1.postForObject(url, xmlParam, String.class);
下面例子用来发起https请求 配置代理服务
/** * 发送https请求 * @param requestUrl 请求地址 * @param requestMethod 请求方式（GET、POST） * @param outputStr 提交的数据 * @return 返回服务器响应的信息 */public String httpsRequest(String requestUrl, String requestMethod, String outputStr) {try { String PROXY_PORT = "80";// 代理服务器端口 String PROXY_HOST = "127.0.0.1";// 改成你自己的代理服务器ip地址 System.setProperty("https.proxyHost", PROXY_HOST); System.setProperty("https.proxyPort", PROXY_PORT); // 创建SSLContext对象，并使用我们指定的信任管理器初始化TrustManager[] tm = { new MyX509TrustManager() };SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");sslContext.init(null, tm, new java.security.SecureRandom());// 从上述SSLContext对象中得到SSLSocketFactory对象SSLSocketFactory ssf = sslContext.getSocketFactory();URL url = new URL(requestUrl);HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();conn.setSSLSocketFactory(ssf);conn.setDoOutput(true);conn.setDoInput(true);conn.setUseCaches(false);// 设置请求方式（GET/POST）conn.setRequestMethod(requestMethod);conn.setRequestProperty("content-type", "application/x-www-form-urlencoded"); // 当outputStr不为null时向输出流写数据if (null != outputStr) {OutputStream outputStream = conn.getOutputStream();// 注意编码格式outputStream.write(outputStr.getBytes("UTF-8"));outputStream.close();}// 从输入流读取返回内容InputStream inputStream = conn.getInputStream();InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");BufferedReader bufferedReader = new BufferedReader(inputStreamReader);String str = null;StringBuffer buffer = new StringBuffer();while ((str = bufferedReader.readLine()) != null) {buffer.append(str);}// 释放资源bufferedReader.close();inputStreamReader.close();inputStream.close();inputStream = null;conn.disconnect();return buffer.toString();} catch (ConnectException ce) {log.error("连接超时：{}", ce);} catch (Exception e) {log.error("https请求异常：{}", e);}return null;} import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import javax.net.ssl.X509TrustManager;/** * 信任管理器 * * Title: MyX509TrustManager * * Description: * * @author * * @date 2020年11月18日 * */public class MyX509TrustManager implements X509TrustManager {// 检查客户端证书public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {}// 检查服务器端证书public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {}// 返回受信任的X509证书数组public X509Certificate[] getAcceptedIssuers() {return null;}}