本文档为获取到代理IP后使用代理的代码样例，供开发者参考。

代码样例直接运行无法得到正确的结果，因为代码中的代理地址/端口和应用账号密码等信息都是虚构的，您替换成自己真实的就可以正常运行了。

如何获取代理地址/端口和设置代理授权？

请参考：接入指南 - 快速入门

使用前提：

1、 已经获取代理地址， 去获取 www.xiaoshitouip.com ：

2、 已经设置代理授权（用户名/密码或者IP白名单）。

package com.example

import okhttp3.*
import org.apache.http.HttpHost
import org.apache.http.auth.AuthScope
import org.apache.http.auth.UsernamePasswordCredentials
import org.apache.http.client.CredentialsProvider
import org.apache.http.client.methods.HttpGet
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.util.EntityUtils
import java.io.IOException
import java.net.InetSocketAddress
import java.net.Proxy
import java.nio.charset.StandardCharsets

fun main(args: Array<String>) {
    // 从 https://www.xiaoshitouip.com/ 领取后，替换自己的ip和端口
    val ip = "代理ip" // 代理主机地址
    val port = 代理端口 // 代理主机端口

    // 替换为自己的用户名
    // 到管理后台：https://admin.xiaoshitouip.com/proxy/proxy-auth 授权管理页面添加账号密码或者ip白名单
    // 设置了ip白名单就不需要设置账号密码了
    // 使用OKHttp库
    OKHttpProxy.build(ip, port).test()
//   OKHttpProxy.build(ip, port, "代理账号", "代理密码").test(); // 代理认证

    // 使用HttpClient库
//   HttpClientProxy.build(ip, port).test();
//   HttpClientProxy.build(ip, port, "代理账号", "代理密码").test(); // 代理认证
}

/**
 * OKHttp库使用代理
 */
internal class OKHttpProxy {
    var proxyHost: String? = null
    var proxyPort = 0
    var proxyAccount: String? = null
    var proxyPwd: String? = null

    @Throws(IOException::class)
    fun test() {
        val targetUrl = "http://myip.ipip.net"
        var client: OkHttpClient? = null
        client = if (proxyAccount == null || proxyPwd == null) {
            getHttpClient(proxyHost, proxyPort)
        } else {
            // 账号密码验证
            getHttpClient(proxyHost, proxyPort, proxyAccount!!, proxyPwd!!)
        }
        val request: Request = Request.Builder()
            .url(targetUrl)
            .build()
        val response: Response = client.newCall(request).execute()
        println(response.body?.string())
    }

    companion object {
        /**
         * @param host 代理主机地址
         * @param port 代理主机端口
         */
        fun build(host: String?, port: Int): OKHttpProxy {
            val proxy = OKHttpProxy()
            proxy.proxyHost = host
            proxy.proxyPort = port
            return proxy
        }

        /**
         * @param host 代理主机地址
         * @param port 代理主机端口
         * @param acc 代理认证账号
         * @param pwd 代理认证口令
         */
        fun build(host: String?, port: Int, acc: String?, pwd: String?): OKHttpProxy {
            val proxy = OKHttpProxy()
            proxy.proxyHost = host
            proxy.proxyPort = port
            proxy.proxyAccount = acc
            proxy.proxyPwd = pwd
            return proxy
        }

        /**
         * 代理不需要账号密码认证的httpClient
         */
        private fun getHttpClient(proxyHost: String?, proxyPort: Int): OkHttpClient {
            val proxy = Proxy(Proxy.Type.HTTP,
 InetSocketAddress(proxyHost, proxyPort))
            return OkHttpClient.Builder()
                .proxy(proxy)
                .build()
        }

        /**
         * 代理需要账号密码认证的httpClient
         */
        private fun getHttpClient(proxyHost: String?, 
proxyPort: Int, acc: String, pwd: String): OkHttpClient {
            val proxy = Proxy(Proxy.Type.HTTP,
 InetSocketAddress(proxyHost, proxyPort))
            // 账号密码验证
            val authenticator: Authenticator = Authenticator { _, response ->
                val credential: String = Credentials.basic(acc, pwd)
                response.request.newBuilder()
.header("Proxy-Authorization", credential).build()
            }
            return OkHttpClient.Builder()
                .proxy(proxy)
                .proxyAuthenticator(authenticator)
                .build()
        }
    }
}

/**
 * HttpClient库使用代理
 */
internal class HttpClientProxy {
    var proxyHost: String? = null
    var proxyPort = 0
    var proxyAccount: String? = null
    var proxyPwd: String? = null

    @Throws(IOException::class)
    fun test() {
        val targetUrl = "http://myip.ipip.net"
        var client: CloseableHttpClient? = null
        client = if (proxyAccount == null || proxyPwd == null) {
            getHttpClient(proxyHost, proxyPort)
        } else {
            // 账号密码验证
            getHttpClient(proxyHost, proxyPort, proxyAccount!!, proxyPwd!!)
        }
        val httpGet = HttpGet(targetUrl)
        val response = client.execute(httpGet)
        val resultStr: String = EntityUtils.toString(response.entity, 
StandardCharsets.UTF_8)
        println(resultStr)
    }

    companion object {
        /**
         * @param host 代理主机地址
         * @param port 代理主机端口
         */
        fun build(host: String?, port: Int): HttpClientProxy {
            val proxy = HttpClientProxy()
            proxy.proxyHost = host
            proxy.proxyPort = port
            return proxy
        }

        /**
         * @param host 代理主机地址
         * @param port 代理主机端口
         * @param acc 代理认证账号
         * @param pwd 代理认证口令
         */
        fun build(host: String?, port: Int, acc: String?, pwd: String?): 
HttpClientProxy {
            val proxy = HttpClientProxy()
            proxy.proxyHost = host
            proxy.proxyPort = port
            proxy.proxyAccount = acc
            proxy.proxyPwd = pwd
            return proxy
        }

        /**
         * 代理不需要账号密码认证的httpClient
         */
        private fun getHttpClient(proxyHost: String?, proxyPort: Int): 
CloseableHttpClient {
            val proxy = HttpHost(proxyHost, proxyPort, "HTTP")
            return HttpClients.custom()
                .setProxy(proxy)
                .build()
        }

        /**
         * 代理需要账号密码认证的httpClient
         */
        private fun getHttpClient(proxyHost: String?,
 proxyPort: Int, acc: String, pwd: String): CloseableHttpClient {
            val proxy = HttpHost(proxyHost, proxyPort, "HTTP")
            val provider: CredentialsProvider = BasicCredentialsProvider()
            provider.setCredentials(AuthScope(proxy), 
UsernamePasswordCredentials(acc, pwd))
            return HttpClients.custom()
                .setProxy(proxy)
                .setDefaultCredentialsProvider(provider)
                .build()
        }
    }
}