httpclient工具方法

HttpClient 是 Apache Jakarta Common 下的子项目，可以用来提供高效的、最新的、功能丰富的支持 HTTP 协议的客户端编程工具包，相比传统JDK自带的URLConnection，增加了易用性和灵活性。它支持http协议和https协议，方法上也支持get和post。下面是一个使用的工具实例供参考（httpClient版本为4.5，IDE为Ideal，编译器level为1.8）。

@Componentpublic class HttpClientUtil {    private static Logger logger = LoggerFactory.getLogger(HttpClientUtil.class);    @Value("${ly.connectionTimeout}")    private int connectionTimeout;    @Value("${ly.socketTimeout}")    private int socketTimeout;    @Value("${ly.keyStore}")    private String keyStore;    @Value("${ly.keyPass}")    private String keyPass;    private static RequestConfig requestConfig = null;    //连接池    private static PoolingHttpClientConnectionManager poolConnManager = null;    //这里想将连接池作为全局变量使用，但是涉及到注入的变量值，导致不能通过static块来初始化。             @PostConstruct    public void init(){        //设置requestConfig        requestConfig = RequestConfig.custom().setConnectTimeout(connectionTimeout)                .setConnectionRequestTimeout(10000).setSocketTimeout(socketTimeout).build();        /*设置通过证书访问https服务的连接池，该连接池只能sendDataWithCert方法使用*/        //如果使用其他方法，则不需要使用证书，无须配置证书路径        if (keyStore == null || StringUtils.isBlank(keyStore)){            logger.warn("【工具方法日志】 证书路径不存在！");            return;        }        SSLContext sslContext = createCertSSL(keyStore,keyPass);        //设置连接工厂        SSLConnectionSocketFactory sslFactory = new SSLConnectionSocketFactory(sslContext);        // 设置协议http和https对应的处理socket链接工厂的对象        Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()                .register("http", PlainConnectionSocketFactory.getSocketFactory())                .register("https", sslFactory)                .build();        poolConnManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);        // 将最大连接数增加到200        poolConnManager.setMaxTotal(200);        // 将每个路由基础的连接增加到30        poolConnManager.setDefaultMaxPerRoute(30);    }    /**     * 发送post请求     * @param url 请求路径     * @param str 请求参数字符串     * @return 请求响应结果字符串     */    public static String sendData(String url, String str) {        SSLConnectionSocketFactory sslFactory = SSLConnectionSocketFactory.getSocketFactory();        //创建httpClient对象        CloseableHttpClient client = HttpClients.custom().setSSLSocketFactory(sslFactory).build();        //创建post方式请求对象        HttpPost httpPost = new HttpPost(url);        httpPost.setConfig(requestConfig);        //设置参数到请求对象中        StringEntity entity = new StringEntity(str,"utf-8");        httpPost.setEntity(entity);        //设置header信息        //指定报文头【Content-type】、【User-Agent】        httpPost.setHeader("Content-type", "application/json");        httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");        return executeHttpPost(httpPost,client);    }    /**     * 信任自定义证书     * @param url 请求url     * @param param 请求参数     * @return 返回请求结果字符串     */    public static String sendDataWithCert(String url, String param) {        if(poolConnManager == null){            logger.warn("【工具方法日志】 连接池初始化失败");        }        CloseableHttpClient client = HttpClients.custom()                .setConnectionManager(poolConnManager)                .setDefaultRequestConfig(requestConfig).build();        //创建post方式请求对象        HttpPost httpPost = new HttpPost(url);        //设置连接超时时间        //httpPost.setConfig(requestConfig);        //设置参数到请求对象中        StringEntity entity = new StringEntity(param,"utf-8");        httpPost.setEntity(entity);        //设置header信息        //指定报文头【Content-type】、【User-Agent】        httpPost.setHeader("Content-type", "application/json");        httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");        return executeHttpPost(httpPost,client);    }    /**     * 信任所有证书,绕过验证     * @param url 请求url     * @param param 请求参数     * @return String　返回请求结果     */    public static String sendDataWithAllCerts(String url, String param){        try{            //信任所有证书            SSLContext sslContext = SSLContexts.custom().loadTrustMaterial(null, (TrustStrategy) (chain, authType) -> true).build();            //设置连接工厂            SSLConnectionSocketFactory sslFactory = new SSLConnectionSocketFactory(sslContext,new String[]{"SSLv2Hello", "SSLv3", "TLSv1", "TLSv1.2"}, null, NoopHostnameVerifier.INSTANCE);            //创建httpClient对象            CloseableHttpClient client = HttpClients.custom().setSSLSocketFactory(sslFactory)                    .setDefaultRequestConfig(requestConfig)                    .build();            //创建post方式请求对象            HttpPost httpPost = new HttpPost(url);            //httpPost.setConfig(requestConfig);            //设置参数到请求对象中            StringEntity entity = new StringEntity(param,"utf-8");            httpPost.setEntity(entity);            //设置header信息            //指定报文头【Content-type】、【User-Agent】            httpPost.setHeader("Content-type", "application/json");            httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");            return executeHttpPost(httpPost,client);        }catch(NoSuchAlgorithmException | KeyStoreException | KeyManagementException e){            logger.info("【工具方法日志】 https请求出现异常,{}",e.getMessage());            return null;        }    }    /**     * 执行post请求并返回影响结果字符串     * @param httpPost post请求     * @param client httpclient客户端     * @return 响应字符串     */    private static String executeHttpPost(HttpPost httpPost,CloseableHttpClient client){        CloseableHttpResponse response = null;        try {            //执行请求操作，并拿到结果（同步阻塞）            response = client.execute(httpPost);            HttpEntity respEntity = response.getEntity();            if (respEntity != null){                return EntityUtils.toString(respEntity);            }        } catch (IOException e) {            //调用异常，timeOut或者协议错误            logger.error("【工具方法日志】  http请求异常！,{}",e.getMessage());        } finally {            try{                if(response != null) {                    response.close();                }            }catch (IOException e){                logger.warn("【工具方法日志】  response关闭异常！,{}",e.getMessage());            }        }        return null;    }    /**     * 返回通过证书验证的SSLContext     * @param keyStorePath 密钥库路径     * @param keyStorePass 密钥库密码     * @return SSLContext     */    private static SSLContext createCertSSL(String keyStorePath, String keyStorePass){        SSLContext sc = null;        FileInputStream instream = null;        KeyStore trustStore;        try{            trustStore = KeyStore.getInstance(KeyStore.getDefaultType());            instream = new FileInputStream(new File(keyStorePath));            trustStore.load(instream, keyStorePass.toCharArray());            // 相信自己的CA和所有自签名的证书            sc = SSLContexts.custom().loadTrustMaterial(trustStore, new TrustSelfSignedStrategy()).build();        }catch (KeyStoreException | NoSuchAlgorithmException| CertificateException | IOException | KeyManagementException e) {            logger.error("【工具方法日志】 生成SSL上下文异常,原因是：",e.getMessage());        } finally {            try {                if (instream != null)                    instream.close();            } catch (IOException e) {                logger.warn("【工具方法日志】 资源关闭异常",e.getMessage());            }        }        return sc;    }}