java http请求中解决跨域问题

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在java代码中为保证在java代码中发送http请求不会发生跨域问题。需要在创建httpclient的时候做特殊的处理。
处理方式也很简单，就是创建httpClient的时候，不再创建简单的ClosableHttpClient.可以为创建httpclient创建一个单独的方法。

/** * 获取 HttpClient,解决跨域问题 * @return HttpClient * @throws NoSuchAlgorithmException * @throws KeyStoreException * @throws KeyManagementException */public static HttpClient getHttpClient() throws NoSuchAlgorithmException, KeyStoreException, KeyManagementException{SSLContextBuilder builder = new SSLContextBuilder();builder.loadTrustMaterial(null, new TrustSelfSignedStrategy());SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(builder.build(),NoopHostnameVerifier.INSTANCE);Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create().register("http",new PlainConnectionSocketFactory()).register("https",sslConnectionSocketFactory).build();PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(registry);cm.setMaxTotal(200);CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(sslConnectionSocketFactory).setConnectionManager(cm).build();return httpClient;}

该方法已经验证可行。拿到http client 以后再执行后续的get或者post操作

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