[网络协议]java 使用socks代理

由于内外网不通，就在内网机搭建了一个socks5代理服务器，使用代理将内网部分数据推送到外网

package com....utils;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.DnsResolver;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.protocol.HttpContext;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;

import javax.net.ssl.SSLContext;
import java.io.*;
import java.net.*;


public class HttpAndHttpsProxy {
    // 依次是代理地址，代理端口号，用户密码
    private static String proxyHost="123.123.123.123";
    private static int proxyPort=8080;


    public static String postWithProxy(String url, String params) {
        Registry<ConnectionSocketFactory> reg = RegistryBuilder.<ConnectionSocketFactory> create()
                .register("http", new MyConnectionSocketFactory())
                .register("https", new MySSLConnectionSocketFactory(SSLContexts.createSystemDefault())).build();
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(reg, new FakeDnsResolver());
        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(cm).build();
        try {
            InetSocketAddress socksaddr = new InetSocketAddress(proxyHost, proxyPort);
            HttpClientContext context = HttpClientContext.create();
            context.setAttribute("socks.address", socksaddr);
            // 创建Post请求
            HttpPost httpPost = new HttpPost(url);
            StringEntity entity = new StringEntity(params, "UTF-8");
            // post请求是将参数放在请求体里面传过去的;这里将entity放入post请求体中
            httpPost.setEntity(entity);
            // 设置ContentType(注:如果只是传普通参数的话,ContentType不一定非要用application/json)
            httpPost.setHeader("Content-Type", "application/json;charset=utf8");

            CloseableHttpResponse response = httpClient.execute(httpPost, context);
            // 从响应模型中获取响应实体
            HttpEntity responseEntity = response.getEntity();
            System.out.println("响应状态为:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("响应内容长度为:" + responseEntity.getContentLength());
                System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
                System.out.println();
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            try {
                httpClient.close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return null;
    }

    static class FakeDnsResolver implements DnsResolver {
        @Override
        public InetAddress[] resolve(String host) throws UnknownHostException {
            // Return some fake DNS record for every request, we won't be using it
            return new InetAddress[] { InetAddress.getByAddress(new byte[] { 1, 1, 1, 1 }) };
        }
    }

    static class MyConnectionSocketFactory extends PlainConnectionSocketFactory {
        @Override
        public Socket createSocket(final HttpContext context) throws IOException {
            InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
            Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
            return new Socket(proxy);
        }

        @Override
        public Socket connectSocket(int connectTimeout, Socket socket, HttpHost host, InetSocketAddress remoteAddress,
                                    InetSocketAddress localAddress, HttpContext context) throws IOException {
            // Convert address to unresolved
            InetSocketAddress unresolvedRemote = InetSocketAddress
                    .createUnresolved(host.getHostName(), remoteAddress.getPort());
            return super.connectSocket(connectTimeout, socket, host, unresolvedRemote, localAddress, context);
        }
    }

    static class MySSLConnectionSocketFactory extends SSLConnectionSocketFactory {

        public MySSLConnectionSocketFactory(final SSLContext sslContext) {
            // You may need this verifier if target site's certificate is not secure
            super(sslContext, ALLOW_ALL_HOSTNAME_VERIFIER);
        }

        @Override
        public Socket createSocket(final HttpContext context) throws IOException {
            InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
            Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
            return new Socket(proxy);
        }

        @Override
        public Socket connectSocket(int connectTimeout, Socket socket, HttpHost host, InetSocketAddress remoteAddress,
                                    InetSocketAddress localAddress, HttpContext context) throws IOException {
            // Convert address to unresolved
            InetSocketAddress unresolvedRemote = InetSocketAddress
                    .createUnresolved(host.getHostName(), remoteAddress.getPort());
            return super.connectSocket(connectTimeout, socket, host, unresolvedRemote, localAddress, context);
        }
    }



}

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? ? ? ? 参考：java用socks5实现内网和外网连接_笙箫的博客-CSDN博客_java socks5由于httpclient使用的是http协议，而socks5是tcp/ip层的代理，所以目前的httpclient还不支持对ss5代理的“开箱即用”。可以通过一下代码来实现httpclient的ss5代理：注意这段代码的有一个非常重要的点是封装了一个FakeDnsResolver，这样写就可以将DNS解析交给SS5代理服务器去做，否则的话，程序会先去做域名解析，在内网机器无法访问外网DNS的时候就会报错package com.yeap.compiletest.jar_test;import https://blog.csdn.net/q15102780705/article/details/111352565