TSL协议升级导致的问题：caught when processing request: Received fatal alert: protocol_version

近日，公司升级TSL协议，禁用TSL1.0，导致原本好好的https接口，报以下错误：

2019-03-05 15:43:29 [org.apache.commons.httpclient.HttpMethodDirector]-[INFO] - I/O exception (javax.net.ssl.SSLException) caught when processing request: Received fatal alert: protocol_version

解决方案：

把原来TSLv1.0协议升级成1.1 or1.2即可。

        SSLContext sslContext = SSLContexts.custom().useTLS().build();

        SSLConnectionSocketFactory f = new SSLConnectionSocketFactory(sslContext, new String[] { "TLSv1.2" }, null,

                null);

        CloseableHttpClient client = HttpClients.custom().setSSLSocketFactory(f).build();

直接贴修改前后的代码：

原始使用的HttpClient版本叫老，默认1.0,且没有重新设置TSL协议版本的地方；为了升级，使用CloseableHttpClient ，且引入SSLContext 。

修改前：

public static String postJosnOld(String url,String jsonString) throws Exception{

        HttpClient client = new HttpClient();

        PostMethod myPost = new PostMethod(url);

        //设置请求超时时间 15秒

        client.getHttpConnectionManager().getParams().setConnectionTimeout(15000);

        String responseString = null;

        //设置请求头部类型

        myPost.setRequestHeader("Content-Type","application/json;charset=utf-8");

        myPost.setRequestHeader("charset","utf-8");

        myPost.setRequestEntity(new StringRequestEntity(jsonString,"text/json","utf-8"));

        int statusCode = client.executeMethod(myPost);

        if(statusCode == HttpStatus.SC_OK){

            BufferedInputStream bis = new BufferedInputStream(myPost.getResponseBodyAsStream());

            byte[] bytes = new byte[1024];

            ByteArrayOutputStream bos = new ByteArrayOutputStream();

            int count = 0;

            while((count = bis.read(bytes))!= -1){

                bos.write(bytes, 0, count);

            }

            byte[] strByte = bos.toByteArray();

            responseString = new String(strByte,0,strByte.length,"utf-8");

            bos.close();

            bis.close();

        }

        myPost.releaseConnection();

        return responseString;

    }

修改后：

    public static String postJosn(String url, String jsonString) throws Exception {

        SSLContext sslContext = SSLContexts.custom().useTLS().build();

        SSLConnectionSocketFactory f = new SSLConnectionSocketFactory(sslContext, new String[] { "TLSv1.2" }, null,

                null);

        CloseableHttpClient client = HttpClients.custom().setSSLSocketFactory(f).build();

        HttpPost myPost = new HttpPost(url);

        myPost.setHeader(HTTP.CONTENT_TYPE, "application/json;charset=utf-8");

        myPost.setHeader("charset", "utf-8");

        StringEntity s = new StringEntity(jsonString, "utf-8");

        s.setContentEncoding("UTF-8");

        s.setContentType("application/json;charset=utf-8");

        myPost.addHeader("Content-Type", "application/json;charset=utf-8");

        myPost.setEntity(s);

        HttpResponse res = client.execute(myPost);

        HttpEntity entity = res.getEntity();

        myPost.releaseConnection();

        return EntityUtils.toString(entity, "utf-8");

    }