使用爬虫代理采集网站失败怎么办

import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.IOException;import java.net.URI;import java.util.Arrays;import java.util.ArrayList;import java.util.HashSet;import java.util.List;import java.util.Set;import org.apache.http.Header;import org.apache.http.HeaderElement;import org.apache.http.HttpHost;import org.apache.http.auth.AuthScope;import org.apache.http.auth.UsernamePasswordCredentials;import org.apache.http.client.AuthCache;import org.apache.http.client.CredentialsProvider;import org.apache.http.client.HttpRequestRetryHandler;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.config.AuthSchemes;import org.apache.http.client.entity.GzipDecompressingEntity;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.methods.HttpRequestBase;import org.apache.http.client.protocol.HttpClientContext;import org.apache.http.config.Registry;import org.apache.http.config.RegistryBuilder;import org.apache.http.conn.socket.ConnectionSocketFactory;import org.apache.http.conn.socket.LayeredConnectionSocketFactory;import org.apache.http.conn.socket.PlainConnectionSocketFactory;import org.apache.http.conn.ssl.SSLConnectionSocketFactory;import org.apache.http.impl.auth.BasicScheme;import org.apache.http.impl.client.BasicAuthCache;import org.apache.http.impl.client.BasicCredentialsProvider;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.impl.client.ProxyAuthenticationStrategy;import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;import org.apache.http.message.BasicHeader;import org.apache.http.message.BasicNameValuePair;import org.apache.http.NameValuePair;import org.apache.http.util.EntityUtils;public class Demo{    // 代理服务器(产品官网 www.16yun.cn)    final static String proxyHost = "t.16yun.cn";    final static Integer proxyPort = 31000;    // 代理验证信息    final static String proxyUser = "username";    final static String proxyPass = "password";    private static PoolingHttpClientConnectionManager cm = null;    private static HttpRequestRetryHandler httpRequestRetryHandler = null;    private static HttpHost proxy = null;    private static CredentialsProvider credsProvider = null;    private static RequestConfig reqConfig = null;    static {        ConnectionSocketFactory plainsf = PlainConnectionSocketFactory.getSocketFactory();        LayeredConnectionSocketFactory sslsf = SSLConnectionSocketFactory.getSocketFactory();        Registry registry = RegistryBuilder.create()            .register("http", plainsf)            .register("https", sslsf)            .build();        cm = new PoolingHttpClientConnectionManager(registry);        cm.setMaxTotal(20);        cm.setDefaultMaxPerRoute(5);        proxy = new HttpHost(proxyHost, proxyPort, "http");        credsProvider = new BasicCredentialsProvider();        credsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(proxyUser, proxyPass));        reqConfig = RequestConfig.custom()            .setConnectionRequestTimeout(5000)            .setConnectTimeout(5000)            .setSocketTimeout(5000)            .setExpectContinueEnabled(false)            .setProxy(new HttpHost(proxyHost, proxyPort))            .build();    }    public static void doRequest(HttpRequestBase httpReq) {        CloseableHttpResponse httpResp = null;        try {            setHeaders(httpReq);            httpReq.setConfig(reqConfig);            CloseableHttpClient httpClient = HttpClients.custom()                .setConnectionManager(cm)                .setDefaultCredentialsProvider(credsProvider)                .build();            AuthCache authCache = new BasicAuthCache();            authCache.put(proxy, new BasicScheme());            HttpClientContext localContext = HttpClientContext.create();            localContext.setAuthCache(authCache);            httpResp = httpClient.execute(httpReq, localContext);            int statusCode = httpResp.getStatusLine().getStatusCode();            System.out.println(statusCode);            BufferedReader rd = new BufferedReader(new InputStreamReader(httpResp.getEntity().getContent()));            String line = "";            while((line = rd.readLine()) != null) {                System.out.println(line);            }        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (httpResp != null) {                    httpResp.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }    }    /**     * 设置请求头     *     * @param httpReq     */    private static void setHeaders(HttpRequestBase httpReq) {        // 设置Proxy-Tunnel        // Random random = new Random();        // int tunnel = random.nextInt(10000);        // httpReq.setHeader("Proxy-Tunnel", String.valueOf(tunnel));        httpReq.setHeader("Accept-Encoding", null);    }    public static void doGetRequest() {        // 要访问的目标页面        String targetUrl = "https://httpbin.org/ip";        try {            HttpGet httpGet = new HttpGet(targetUrl);            doRequest(httpGet);        } catch (Exception e) {            e.printStackTrace();        }    }    public static void main(String[] args) {        doGetRequest();    }}