小工具－使用java SSL通过url获得访问转为String－http／https

最新推荐文章于 2022-05-11 16:34:53 发布

原创最新推荐文章于 2022-05-11 16:34:53 发布 · 747 阅读

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本文介绍了一种通过Java实现的HTTP和HTTPS请求处理方法。针对不同的协议，代码提供了getHttp和getHttps两个方法来获取网页内容。对于HTTPS请求，特别实现了不安全的信任管理机制以绕过证书验证。

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分为Http和Https两种。

public class SSLUtils {

    public static String getHttp(String url) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost post = new HttpPost(url);
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(post);
        } catch (IOException e) {
            throw e;
        }
        HttpEntity entity = response.getEntity();
        String result = null;
        try {
            result = EntityUtils.toString(entity);
        } catch (ParseException | IOException e) {
            throw e;
        }
        return result;
    }

    public static String getHttps(String url) throws IOException {
        HttpPost post = new HttpPost(url);
        CloseableHttpResponse response = createSSLInsecureClient().execute(post);
        return stream2Str(response.getEntity().getContent());
    }

    private static String stream2Str(InputStream inputStream) throws IOException {
        StringBuilder sbu = new StringBuilder();
        InputStreamReader inputStreamReader;
        try {
            inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader reader = new BufferedReader(inputStreamReader);
            String line;
            while ((line = reader.readLine()) != null) {
                sbu.append(line);
            }
            return sbu.toString();
        } catch (IOException e) {
            throw e;
        }
    }

    private static CloseableHttpClient createSSLInsecureClient() {
        try {
            SSLContext sslContext = new SSLContextBuilder()
                    .loadTrustMaterial(null, (x509Certificates, s) -> true).build();
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                    sslContext);
            return HttpClients.custom().setSSLSocketFactory(sslsf).build();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return HttpClients.createDefault();
    }

}