java/HttpClient：get、post 设置代理（java.net.UnknownHostException）

java.net.UnknownHostException: qyapi.weixin.qq.com

  at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
  at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929)
  at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324)
  at java.net.InetAddress.getAllByName0(InetAddress.java:1277)
  at java.net.InetAddress.getAllByName(InetAddress.java:1193)
  at java.net.InetAddress.getAllByName(InetAddress.java:1127)

import org.apache.http.*;
import org.apache.http.client.config.RequestConfig;
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.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.*;
 

/**
 * @Author ZhangLe
 * @Date 2020/10/30 15:58
 */
public class ProxySendUtils {

    //消息体内容类型
    public static final String CONTENT_TYPE = "Content-Type";
    // 以秒为单位
    static int timeout = 10 * 1000;
    //代理IP
    static String host = "127.0.0.1";
    //代理端口
    static int port = 8088;


    /**
     * 向指定URL发送GET方法的请求
     * @param url
     * @return
     */
    public  String sendGet1(String url) {
        String result = "";
        BufferedReader in = null;
        try {
            URL realUrl = new URL(url);

            // 创建代理服务器
            InetSocketAddress addr = new InetSocketAddress(host, port);
            //http 代理
            Proxy proxy = new Proxy(Proxy.Type.HTTP, addr);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection(proxy);

            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.setRequestProperty("Content-type", "application/x-www-form-urlencoded;");
            connection.setConnectTimeout(timeout);
            connection.setReadTimeout(timeout);

            // 建立实际的连接
            connection.connect();

            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "gbk"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 发送代理get
     * @param url
     * @param charset 默认填 UTF-8
     * @return
     * @throws HttpException
     * @throws IOException
     */
    public  String sendGet2(String url, String charset) throws HttpException, IOException {
        String json = null;
        HttpGet httpGet = new HttpGet();
        CloseableHttpClient client = setProxy(httpGet, host, port);
        // 设置参数
        try {
            httpGet.setURI(new URI(url));
        } catch (URISyntaxException e) {
            throw new HttpException("请求url格式错误。"+e.getMessage());
        }
        // 发送请求
        HttpResponse httpResponse = client.execute(httpGet);
        // 获取返回的数据
        HttpEntity entity = httpResponse.getEntity();
        byte[] body = EntityUtils.toByteArray(entity);
        StatusLine sL = httpResponse.getStatusLine();
        int statusCode = sL.getStatusCode();
        if (statusCode == 200) {
            json = new String(body, charset);
            entity.consumeContent();
        } else {
            throw new HttpException("statusCode="+statusCode);
        }
        return json;
    }
    /**
     * 创建发送请求post实体
     *
     * @param charset     消息编码 默认填 UTF-8
     * @param contentType 消息体内容类型，默认可以写工具类 CONTENT_TYPE 
     * @param url         消息发送请求地址
     * @param data        为post数据
     * @return
     * @throws
     */
    public String sendPost(String charset, String contentType, String url, String data) throws Exception {
       
        HttpPost httpPost = new HttpPost(url );
        
        CloseableHttpClient client = setProxy(httpPost, host, port);
        httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36");

        httpPost.setHeader(CONTENT_TYPE, contentType);
        httpPost.setEntity(new StringEntity(data, charset));
        CloseableHttpResponse response = client.execute(httpPost);

        String resp = null;
        try {
            HttpEntity entity = response.getEntity();
            resp = EntityUtils.toString(entity, charset);
            EntityUtils.consume(entity);
        } finally {
            response.close();
        }
        LoggerFactory.getLogger(getClass()).info( "call [{}], param:{}, resp:{}", url, data, resp);
        return resp;
    }


    /**
     * 设置代理
     *
     * @param httpGet
     * @param proxyIp
     * @param proxyPort
     * @return
     */
    public static CloseableHttpClient setProxy(HttpRequestBase httpGet, String proxyIp, int proxyPort) {
        // 创建httpClient实例
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //设置代理IP、端口
        HttpHost proxy = new HttpHost(proxyIp, proxyPort, "http");
        //也可以设置超时时间 需要了放开注释 不需要忽略
/*         RequestConfig requestConfig = RequestConfig
                 .custom()
                 .setProxy(proxy)
                 .setConnectTimeout(timeout)
                 .setSocketTimeout(timeout)
                 .setConnectionRequestTimeout(timeout)
                 .build();*/
        RequestConfig requestConfig = RequestConfig.custom().setProxy(proxy).build();
        httpGet.setConfig(requestConfig);
        return httpClient;
    }
}