java - 尝试下载文件时，Apache HttpClient 在握手异常期间抛出远程主机关闭连接

Question

我有一个 url，其中可以通过 http 下载文件。如果我用 curl 点击那个 url，文件下载没有问题。但是，如果我尝试使用 Apache HttpClient 编写代码，它会出现异常。这是代码...

HttpClient httpClient = new HttpClient()
HttpMethod method = new GetMethod("https://www2.mycompany.com/internet/cats/productfeed.nsf/xmlproductfeed?openview")
def responseCode = httpClient.executeMethod(method)

异常(exception)是

javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:882)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1188)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:654)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write(AppOutputStream.java:100)
at org.apache.commons.httpclient.HttpConnection.flushRequestOutputStream(HttpConnection.java:828)
at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:2116)
at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1096)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)

可以是url中的https还是www2？

Answer 1

您正在通过 HTTPS 调用 URL，这是一个 TLS 连接。您需要将客户端设置为使用 SSL/TLS。

这里是一个例子，重写为HttpGet，但这应该很容易:

// Trust own CA and all self-signed certs
    SSLContext sslcontext = createEasySSLContext();
    // Allow TLSv1 protocol only
    SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext,
            new String[] { "TLSv1", "TLSv1.1", "TLSv1.2" }, null,
            SSLConnectionSocketFactory.getDefaultHostnameVerifier());
    CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();

    String userCredentials = username + ":" + password;
    String basicAuth = "Basic " + new String(new Base64().encode(userCredentials.getBytes()));

    CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));
    HttpClientContext localContext = HttpClientContext.create();
    localContext.setCredentialsProvider(credentialsProvider);

    HttpPost httpPost = new HttpPost(path);