在復雜的網絡環境中，很多使用socks5代理服務器，那么在代碼中通常一些socket連接操作需要針對socks5協議做一些修改。下面我們主要介紹java中對于使用socks5代理的改造。

1.基于jsch進行ssh連接

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);
            //加上這段設置代理
            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 +" 連接成功, 用戶 : " + this.user);
                break;
            }
        } catch (JSchException e) {
            logger.warn("第"+(i+1) + "次連接失敗  " + this.host + " : " + this.port + ", 用戶: " + this.user, e);
        }
        //sleep 后，嘗試重新連接
        if (i != tryConnectTimes - 1) {
            try {
                Thread.sleep(this.sleepTime);
            } catch (InterruptedException e) {
                logger.warn("connect() : sleep 出現異常");
            }
        }
    }
    //達到最大連接次數，拋出異常
    if (i >= tryConnectTimes) {
        throw new JSchException(this.host + " : " + this.port + " 連接超時, 用戶: " + this.user);
    }
}

2.Spring中RestTemplate通過socks5連接

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

        // 創建憑據提供程序，并設置憑據
        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));

        // 創建 HttpClient，并配置 SOCKS5 代理和憑據提供程序
        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 {
                        // 如果目標主機是需要走代理的，返回代理主機
                        if ("example.com".equals(target.getHostName())) {
                            return super.determineProxy(target, request, context);
                        }
                        // 否則返回 null，表示直接連接目標主機
                        return null;
                    }
                })
                .build();

        // 創建 HttpComponentsClientHttpRequestFactory，并設置 HttpClient
        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);

        // 創建 RestTemplate，并設置請求工廠
        RestTemplate restTemplate = new RestTemplate(requestFactory);

        return restTemplate;
    }