在复杂的网络环境中，很多使用socks5代理服务器，那么在代码中通常一些socket连接操作需要针对socks5协议做一些修改。下面我们主要介绍java中对于使用socks5代理的改造。

1.基于jsch进行ssh连接

public void connect() throws JSchException{
    int i = 0;
    for (; i < this.tryConnectTimes; i++) {
        try {
            this.session = jsch.getSession(this.user, this.host, this.port);
            this.session.setConfig(this.properties);
            this.session.setPassword(this.password);
            this.session.setSocketFactory(this.socketFactory);
            this.session.setTimeout(this.readTimeout);
            //加上这段设置代理
            ProxySOCKS5 proxy = new ProxySOCKS5("172.16.0.14", 1002);
            proxy.setUserPasswd("dds", "ueJ20@d8in25");
            session.setProxy(proxy);
            
            this.session.connect();
            if (this.session.isConnected()) {
                logger.debug(this.host + " : " + this.port +" 连接成功, 用户 : " + this.user);
                break;
            }
        } catch (JSchException e) {
            logger.warn("第"+(i+1) + "次连接失败  " + this.host + " : " + this.port + ", 用户: " + this.user, e);
        }
        //sleep 后，尝试重新连接
        if (i != tryConnectTimes - 1) {
            try {
                Thread.sleep(this.sleepTime);
            } catch (InterruptedException e) {
                logger.warn("connect() : sleep 出现异常");
            }
        }
    }
    //达到最大连接次数，抛出异常
    if (i >= tryConnectTimes) {
        throw new JSchException(this.host + " : " + this.port + " 连接超时, 用户: " + this.user);
    }
}

2.Spring中RestTemplate通过socks5连接

    public static RestTemplate createRestTemplateWithSocks5Proxy(String socks5Host, int socks5Port, String username, String password) {
        // 创建 SOCKS5 代理的主机
        HttpHost socks5Proxy = new HttpHost(socks5Host, socks5Port, "socks");

        // 创建凭据提供程序，并设置凭据
        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));

        // 创建 HttpClient，并配置 SOCKS5 代理和凭据提供程序
        CloseableHttpClient httpClient = HttpClients.custom()
                .setDefaultCredentialsProvider(credentialsProvider)
                .setRoutePlanner(new DefaultProxyRoutePlanner(socks5Proxy) {
                    @Override
                    public HttpHost determineProxy(org.apache.http.HttpHost target,
                                                   org.apache.http.HttpRequest request,
                                                   org.apache.http.protocol.HttpContext context) throws HttpException {
                        // 如果目标主机是需要走代理的，返回代理主机
                        if ("example.com".equals(target.getHostName())) {
                            return super.determineProxy(target, request, context);
                        }
                        // 否则返回 null，表示直接连接目标主机
                        return null;
                    }
                })
                .build();

        // 创建 HttpComponentsClientHttpRequestFactory，并设置 HttpClient
        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);

        // 创建 RestTemplate，并设置请求工厂
        RestTemplate restTemplate = new RestTemplate(requestFactory);

        return restTemplate;
    }