public String postSSLUrlWithParamsString url Map params String encoding String keyStorePath String encode = CHARSET; if !StringUtilisEmptyencoding encode = encoding;

要在该方法中加入代理，你可以使用HttpHost类来定义代理服务器的主机名和端口号，并使用DefaultProxyRoutePlanner类来设置代理路由计划。以下是修改后的代码示例：

public String postSSLUrlWithParams(String url, Map<String, String> params, String encoding, String keyStorePath, String proxyHost, int proxyPort) {
    String encode = CHARSET;
    if (!StringUtil.isEmpty(encoding)) {
        encode = encoding;
    }
    if (StringUtil.isEmpty(keyStorePath)) {
        keyStorePath = KEY_STORE_PATH;
    }
    log.info("httpClient invocation");
    DefaultHttpClient httpclient = new DefaultHttpClient();
    HttpPost httpost = new HttpPost(url);
    
    // 设置代理
    if (!StringUtil.isEmpty(proxyHost) && proxyPort > 0) {
        HttpHost proxy = new HttpHost(proxyHost, proxyPort);
        httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
    }
    
    // 添加参数
    List<NameValuePair> nvps = new ArrayList<NameValuePair>();
    if (params != null && !params.isEmpty()) {
        for (Map.Entry<String, String> entry : params.entrySet()) {
            nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
    }
    StringBuilder sb = new StringBuilder();
    BufferedReader br = null;
    try {
        httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, CONNECTION_TIMEOUT);
        httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, SO_TIMEOUT);
        httpclient.getConnectionManager().getSchemeRegistry().register(new Scheme("http", DEFAULT_HTTP_PORT, PlainSocketFactory.getSocketFactory()));
        httpclient.getConnectionManager().getSchemeRegistry().register(new Scheme("https", DEFAULT_HTTPS_PORT, getTrustSSLSocketFactory()));
        httpost.setEntity(new UrlEncodedFormEntity(nvps, encode));
        HttpResponse response = httpclient.execute(httpost);
        HttpEntity entity = response.getEntity();
        br = new BufferedReader(new InputStreamReader(entity.getContent(), encode));
        String s = null;
        while ((s = br.readLine()) != null) {
            sb.append(s);
        }
        return sb.toString();
    } catch (UnsupportedEncodingException e) {
        log.error("创建通信异常", e);
        throw new RuntimeException("创建通信异常", e);
    } catch (IOException e) {
        log.error("读取流文件异常 ", e);
        throw new RuntimeException("读取流文件异常 ", e);
    } catch (Exception e) {
        log.error("通讯未知系统异常 ", e);
        throw new RuntimeException("通讯未知系统异常 ", e);
    } finally {
        try {
            if (br != null) {
                br.close();
            }
            httpost.releaseConnection();
            httpclient.getConnectionManager().shutdown();
        } catch (Exception e) {
            LOGGER.error(e.getMessage(), e);
        }
    }
}

你可以在调用该方法时，传递代理服务器的主机名和端口号作为参数，如下所示：

String proxyHost = "your_proxy_host";
int proxyPort = 8080;
String response = postSSLUrlWithParams(url, params, encoding, keyStorePath, proxyHost, proxyPort);
``