java——HttpClient 代理模式发送Http Https

在setProxy()方法中设置代理IP后可以将url中的域名换成这个代理IP。

http很简单，但是https这样会报错。

问题：如何使用代理发送https请求？

客户端发送https请求之前会先向这台服务器请求ssl证书，并在客服端对这个证书做一个校验。

而使用代理IP时，实际上请求打到了这个代理IP上，而客户端并不知道这件事，他仍然在等待url域名中所对应的ssl证书，而这代理ip对应的服务器实际上并没有这个证书，导致了https请求失败。

解决方法：

HttpClient中有一个类，里面的方法中包含了需要验证的所有ssl证书类型，而我们只需要重写这个方法，并把需要验证的证书设置为空，即命令客户端不验证任何ssl证书，就ok了。

关于http请求头中的host字段：

https://blog.csdn.net/yzpbright/article/details/51052008

代码：

 private JSONObject HttpPing(String dns, String uri, String qlb, String scheme) {

        String url = scheme + "://" + dns + uri;

        CloseableHttpClient httpclient = null;

        if (scheme.equals("http")) {

            httpclient = getHttpClient(qlb);

        } else if (scheme.equals("https")) {

            httpclient = getHttpsClient(qlb);

        } else{

            return null;

        }

        HttpGet httpGet = new HttpGet(url);

        CloseableHttpResponse httpResp = null;

        try {

            httpResp = httpclient.execute(httpGet);

        } catch (IOException e) {

            e.printStackTrace();

        }

        try {

            int statusCode = httpResp.getStatusLine().getStatusCode();

            if (statusCode == org.apache.http.HttpStatus.SC_OK) {

                return JSONObject.parseObject(EntityUtils.toString(httpResp.getEntity(), "UTF-8"));

            }

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            try {

                httpResp.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

        return null;

    }

　　private CloseableHttpClient getHttpClient(String qlb) {

        HttpHost proxy = new HttpHost(qlb, 80, "http");

        //把代理设置到请求配置

        RequestConfig defaultRequestConfig = RequestConfig.custom()

                .setProxy(proxy)

                .build();

        CloseableHttpClient httpclient = HttpClients.custom().setDefaultRequestConfig(defaultRequestConfig).build();

        return httpclient;

    }

    private CloseableHttpClient getHttpsClient(String qlb) {
　　　　//这里设置客户端不检测服务器ssl证书

        try {

            X509TrustManager x509mgr = new X509TrustManager() {

                public void checkClientTrusted(X509Certificate[] xcs, String string) {

                }

                public void checkServerTrusted(X509Certificate[] xcs, String string) {

                }

                public X509Certificate[] getAcceptedIssuers() {

                    return null;

                }

            };

            SSLContext sslContext = SSLContext.getInstance("TLS");

            sslContext.init(null, new TrustManager[] { x509mgr }, null);

            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

            HttpHost proxy = new HttpHost(qlb, 443, "https");

            RequestConfig defaultRequestConfig = RequestConfig.custom()

                    .setProxy(proxy)

                    .build();

            CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).setDefaultRequestConfig(defaultRequestConfig).build();

            return httpclient;

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

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java——HttpClient 代理模式发送Http Https

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