Java-HTTPClient实现HTTPS请求

目前只实现了https的GET请求，后续还会继续更新

一、GET请求

public static void submitGet() {
		
		try {
			//显示https握手过程，方便调试
//			System.setProperty("javax.net.debug", "all");
			
			//调试双向认证使用，暂不使用
			SSLContext sslcontext = SSLContexts.custom()
                    .loadTrustMaterial(new File("D:\Java\jdkSE-8u201\bin\steven.keystore"), "123456".toCharArray(),
                            new TrustSelfSignedStrategy())
                    .build();
			
			// 证书全部信任 不做身份鉴定
			SSLContextBuilder builder = new SSLContextBuilder();
			builder.loadTrustMaterial(null, new TrustStrategy() {

				@Override
				public boolean isTrusted(X509Certificate[] ax509certificate,
						String s) throws CertificateException {
					// TODO Auto-generated method stub
					return true;
				}
			});
			
			//使用谷歌浏览器查看网页使用的是哪一个SSL协议，SSLv2Hello需要删掉，不然会报握手失败，具体原因还不知道
			SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(builder.build(), new String[] {
					"SSLv2Hello", "SSLv3", "TLSv1", "TLSv1.2" }, null,
					NoopHostnameVerifier.INSTANCE);
			
			Registry<ConnectionSocketFactory> registry = RegistryBuilder
					.<ConnectionSocketFactory> create()
					.register("http", new PlainConnectionSocketFactory())
					.register("https", sslsf).build();
			
			PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(registry);
			cm.setMaxTotal(200);// max connection
			
			
			CloseableHttpClient client = HttpClients.custom()
					.setSSLSocketFactory(sslsf).setConnectionManager(cm)
					.setConnectionManagerShared(true).build();
			//开始设置请求相关信息
			HttpGet httpGet = new HttpGet("https://192.168.1.245/test/pages/login.jsp");
			CloseableHttpResponse response = client.execute(httpGet);
			HttpEntity entity = response.getEntity();
			if(entity != null) {
				System.out.println("长度：" + entity.getContentLength());
				System.out.println("内容：" + EntityUtils.toString(entity, "gbk"));
			}
			response.close();
			client.close();
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (KeyStoreException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (KeyManagementException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClientProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (CertificateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

相关扩展

错误1：javax.net.ssl.SSLException: Received fatal alert: protocol_version

可以在代码中添加：System.setProperty("javax.net.debug", "all");打印握手过程，帮助分析

查看客户端网页使用的哪个ssl，我用的谷歌看的

错误2：java.net.ConnectException: Connection refused: connect

服务器没有启动

错误3：.javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed

服务端证书不可信

错误4：java.net.SocketException: Software caused connection abort: recv failed

服务端是双向认证，客户端发送的是单向认证，没有将客户端证书一起发送

错误5：org.apache.commons.httpclient.NoHttpResponseException

一般是服务端防火墙拦截，也有可能是负载过重

错误6：javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake

这是由于服务端配置的是SSL双向认证，而客户端发送数据是按照服务器是单向认证时发送的，即没有将客户端证书信息一起发送给服务端。服务端验证客户端证书时，发现客户端没有证书，然后就断开了握手连接。

参考资料：

https://blog.csdn.net/coqcnbkggnscf062/article/details/79812102

https://hc.apache.org/httpcomponents-client-ga/httpclient/examples/org/apache/http/examples/client/ClientCustomSSL.java

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