java发起get请求和post请求的各种情况整合。具体看代码以及注释。其中Constants.UTF8本质是指"UTF-8"
import java.io.*;import .*;import java.nio.charset.StandardCharsets;import java.security.cert.X509Certificate;import .ssl.HostnameVerifier;import .ssl.HttpsURLConnection;import .ssl.SSLContext;import .ssl.SSLSession;import .ssl.TrustManager;import .ssl.X509TrustManager;import org.slf4j.Logger;import org.slf4j.LoggerFactory;/*** 通用http发送方法* * @author ruoyi*/public class HttpUtils{private static final Logger log = LoggerFactory.getLogger(HttpUtils.class);/*** 向指定 URL 发送GET方法的请求** @param url 发送请求的 URL* @return 所代表远程资源的响应结果*/public static String sendGet(String url){return sendGet(url, "");}/*** 向指定 URL 发送GET方法的请求** @param url 发送请求的 URL* @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。* @return 所代表远程资源的响应结果*/public static String sendGet(String url, String param){return sendGet(url, param, Constants.UTF8);}/*** 向指定 URL 发送GET方法的请求** @param url 发送请求的 URL* @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。* @param contentType 编码类型* @return 所代表远程资源的响应结果*/public static String sendGet(String url, String param, String contentType){StringBuilder result = new StringBuilder();BufferedReader in = null;try{String urlNameString = (param!=null&¶m!="") ? url + "?" + param : url;log.info("sendGet - {}", urlNameString);URL realUrl = new URL(urlNameString);URLConnection connection = realUrl.openConnection();connection.setRequestProperty("accept", "*/*");connection.setRequestProperty("connection", "Keep-Alive");connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");connection.connect();in = new BufferedReader(new InputStreamReader(connection.getInputStream(), contentType));String line;while ((line = in.readLine()) != null){result.append(line);}log.info("recv - {}", result);}catch (ConnectException e){log.error("调用HttpUtils.sendGet ConnectException, url=" + url + ",param=" + param, e);}catch (SocketTimeoutException e){log.error("调用HttpUtils.sendGet SocketTimeoutException, url=" + url + ",param=" + param, e);}catch (IOException e){log.error("调用HttpUtils.sendGet IOException, url=" + url + ",param=" + param, e);}catch (Exception e){log.error("调用HttpsUtil.sendGet Exception, url=" + url + ",param=" + param, e);}finally{try{if (in != null){in.close();}}catch (Exception ex){log.error("调用in.close Exception, url=" + url + ",param=" + param, ex);}}return result.toString();}/*** 向指定 URL 发送POST方法的请求** @param param 发送请求的 URL* @param param 请求参数，请求参数应该是json的形式。* @return 所代表远程资源的响应结果*/public static String sendPostJson(String reqUrl, String param){String result = "";HttpURLConnection httpURLConnection = null;BufferedReader reader = null;try {URL url = new URL(reqUrl);httpURLConnection = (HttpURLConnection) url.openConnection();httpURLConnection.setRequestMethod("POST");httpURLConnection.setConnectTimeout(5000);httpURLConnection.setDoOutput(true);httpURLConnection.setDoInput(true);httpURLConnection.setUseCaches(false);httpURLConnection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");httpURLConnection.connect();OutputStream os = httpURLConnection.getOutputStream();os.write(param.getBytes("utf-8"));os.flush();os.close();if (httpURLConnection.getResponseCode() == 200) {String encoding = httpURLConnection.getContentEncoding();log.info("编码格式",encoding);//注意StandardCharsets.UTF_8 否则打成jar包后会出现中文乱码reader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(), StandardCharsets.UTF_8));String data = "";StringBuilder builder = new StringBuilder();while ((data = reader.readLine()) != null) {builder.append(data);}result = builder.toString();}} catch (Exception e) {e.printStackTrace();} finally {try {if (reader != null) {reader.close();}if (httpURLConnection != null) {httpURLConnection.disconnect();}} catch (Exception e) {e.printStackTrace();}}log.info("转发结果===>"+result);return result;}/*** post方式请求服务器(https协议)** @param url求地址* @param content 参数* @return*/public static String sendJsonToHttpsPost(String url, String content) {try {/** 类HttpsURLConnection似乎并没有提供方法设置信任管理器。其实，* HttpsURLConnection通过SSLSocket来建立与HTTPS的安全连接* ，SSLSocket对象是由SSLSocketFactory生成的。* HttpsURLConnection提供了方法setSSLSocketFactory* (SSLSocketFactory)设置它使用的SSLSocketFactory对象。* SSLSocketFactory通过SSLContext对象来获得，在初始化SSLContext对象时，可指定信任管理器对象。*/SSLContext sc = SSLContext.getInstance("SSL");sc.init(null, new TrustManager[]{new TrustAnyTrustManager()},new java.security.SecureRandom());URL console = new URL(url);HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();conn.setSSLSocketFactory(sc.getSocketFactory());conn.setHostnameVerifier(new TrustAnyHostnameVerifier());conn.setDoOutput(true);// 设置请求头conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");conn.connect();DataOutputStream out = new DataOutputStream(conn.getOutputStream());out.write(content.getBytes(Constants.UTF8));// 刷新、关闭out.flush();out.close();InputStream is = conn.getInputStream();if (is != null) {/*ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = is.read(buffer)) != -1) {outStream.write(buffer, 0, len);}is.close();*///注意StandardCharsets.UTF_8 否则打成jar包后会出现中文乱码BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8));String data = "";StringBuilder builder = new StringBuilder();while ((data = bufferedReader.readLine()) != null) {builder.append(data);}System.out.println("结果====》 ");System.out.println(builder.toString());return builder.toString();//return new String(outStream.toByteArray(), Constants.UTF8);}} catch (Exception e) {log.info("JSON数据发送失败，异常：{}", e.getMessage());log.error("异常：", e);}return null;}/*** 向指定 URL 发送POST方法的请求** @param url 发送请求的 URL* @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。* @return 所代表远程资源的响应结果*/public static String sendPost(String url, String param){PrintWriter out = null;BufferedReader in = null;StringBuilder result = new StringBuilder();try{log.info("sendPost - {}", url);URL realUrl = new URL(url);URLConnection conn = realUrl.openConnection();conn.setRequestProperty("accept", "*/*");conn.setRequestProperty("connection", "Keep-Alive");conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");conn.setRequestProperty("Accept-Charset", "utf-8");conn.setRequestProperty("contentType", "utf-8");conn.setDoOutput(true);conn.setDoInput(true);out = new PrintWriter(conn.getOutputStream());out.print(param);out.flush();in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));String line;while ((line = in.readLine()) != null){result.append(line);}log.info("recv - {}", result);}catch (ConnectException e){log.error("调用HttpUtils.sendPost ConnectException, url=" + url + ",param=" + param, e);}catch (SocketTimeoutException e){log.error("调用HttpUtils.sendPost SocketTimeoutException, url=" + url + ",param=" + param, e);}catch (IOException e){log.error("调用HttpUtils.sendPost IOException, url=" + url + ",param=" + param, e);}catch (Exception e){log.error("调用HttpsUtil.sendPost Exception, url=" + url + ",param=" + param, e);}finally{try{if (out != null){out.close();}if (in != null){in.close();}}catch (IOException ex){log.error("调用in.close Exception, url=" + url + ",param=" + param, ex);}}return result.toString();}public static String sendSSLPost(String url, String param){StringBuilder result = new StringBuilder();String urlNameString = url + "?" + param;try{log.info("sendSSLPost - {}", urlNameString);SSLContext sc = SSLContext.getInstance("SSL");sc.init(null, new TrustManager[] {new TrustAnyTrustManager() }, new java.security.SecureRandom());URL console = new URL(urlNameString);HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();conn.setRequestProperty("accept", "*/*");conn.setRequestProperty("connection", "Keep-Alive");conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");conn.setRequestProperty("Accept-Charset", "utf-8");conn.setRequestProperty("contentType", "utf-8");conn.setDoOutput(true);conn.setDoInput(true);conn.setSSLSocketFactory(sc.getSocketFactory());conn.setHostnameVerifier(new TrustAnyHostnameVerifier());conn.connect();InputStream is = conn.getInputStream();BufferedReader br = new BufferedReader(new InputStreamReader(is));String ret = "";while ((ret = br.readLine()) != null){if (ret != null && !"".equals(ret.trim())){result.append(new String(ret.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8));}}log.info("recv - {}", result);conn.disconnect();br.close();}catch (ConnectException e){log.error("调用HttpUtils.sendSSLPost ConnectException, url=" + url + ",param=" + param, e);}catch (SocketTimeoutException e){log.error("调用HttpUtils.sendSSLPost SocketTimeoutException, url=" + url + ",param=" + param, e);}catch (IOException e){log.error("调用HttpUtils.sendSSLPost IOException, url=" + url + ",param=" + param, e);}catch (Exception e){log.error("调用HttpsUtil.sendSSLPost Exception, url=" + url + ",param=" + param, e);}return result.toString();}public static class TrustAnyTrustManager implements X509TrustManager{@Overridepublic void checkClientTrusted(X509Certificate[] chain, String authType){}@Overridepublic void checkServerTrusted(X509Certificate[] chain, String authType){}@Overridepublic X509Certificate[] getAcceptedIssuers(){return new X509Certificate[] {};}}public static class TrustAnyHostnameVerifier implements HostnameVerifier{@Overridepublic boolean verify(String hostname, SSLSession session){return true;}}}
