java http请求和https请求

jar包：

httpclient-4.3.1.jar

http post请求

xml是post的参数流

url就是链接，要以http开头

返回参数是url返给你的

        public static String httpPost(String xml) throws UnsupportedEncodingException {String jsonStr = null;//正式String URL = "";HttpClient httpClient = new HttpClient();PostMethod postMethod = new PostMethod(URL.toString());//设置连接超时    3shttpClient.getHttpConnectionManager().getParams().setConnectionTimeout(3000);//设置读取数据超时    3stry {List<Header> headers = new ArrayList<Header>();headers.add(new Header("contentLength", URL.toString().length() + ""));httpClient.getHostConfiguration().getParams().setParameter("http.default-headers", headers);postMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());RequestEntity requestEntity = new ByteArrayRequestEntity(xml.getBytes("UTF-8"));postMethod.setRequestEntity(requestEntity);int statusCode = httpClient.executeMethod(postMethod);System.err.println("statusCode:" + statusCode);if (statusCode != HttpStatus.SC_OK) {} else {// 解析byte [] responseBody = postMethod.getResponseBody();jsonStr = new String(responseBody, "UTF-8");}} catch (HttpException e) {System.out.println("JsonGet Chatroom HttpException:");e.printStackTrace();} catch (IOException e) {System.out.println("JsonGet Chatroom IOException:");e.printStackTrace();} catch (Exception e) {System.out.println("JsonGet Chatroom Exception:");e.printStackTrace();} finally {postMethod.releaseConnection();}return jsonStr;}

get 请求

方法都和post比较像，po出不一样的地方自己对比一下

                HttpClient httpClient = new HttpClient();GetMethod getMethod = new GetMethod(sb.toString().replace(" ", "%20"));List<Header> headers = new ArrayList<Header>();headers.add(new Header("contentLength", sb.toString().length() + ""));httpClient.getHostConfiguration().getParams().setParameter("http.default-headers", headers);getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());

https 请求

先定义一下ssl证书管理器（MyX509TrustManager.java）

import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import javax.net.ssl.X509TrustManager;public class MyX509TrustManager implements X509TrustManager {public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {}public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {}public X509Certificate[] getAcceptedIssuers() {return null;}}

/** * HTTPS数据传输 通过SSL *  * @param requestUrl需要传输的url * @param requestMethod传输方式：GET/POST * @param outputStr传输参数 * @return返回参数 */public static String httpRequestXML(String requestUrl, String requestMethod, String outputStr) {  StringBuffer buffer = new StringBuffer();  try {  // 创建SSLContext对象，并使用我们指定的信任管理器初始化  TrustManager[] tm = { new MyX509TrustManager() };  SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");  sslContext.init(null, tm, new java.security.SecureRandom());  // 从上述SSLContext对象中得到SSLSocketFactory对象  SSLSocketFactory ssf = sslContext.getSocketFactory();  URL url = new URL(requestUrl);  HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();  httpUrlConn.setSSLSocketFactory(ssf);  httpUrlConn.setDoOutput(true);  httpUrlConn.setDoInput(true);  httpUrlConn.setUseCaches(false);  // 设置请求方式（GET/POST）  httpUrlConn.setRequestMethod(requestMethod);  if ("GET".equalsIgnoreCase(requestMethod))  httpUrlConn.connect();  // 当有数据需要提交时  if (null != outputStr) {  OutputStream outputStream = httpUrlConn.getOutputStream();  // 注意编码格式，防止中文乱码  outputStream.write(outputStr.getBytes("UTF-8"));  outputStream.close();  }  // 将返回的输入流转换成字符串  InputStream inputStream = httpUrlConn.getInputStream();  InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");  BufferedReader bufferedReader = new BufferedReader(inputStreamReader);  String str = null;  while ((str = bufferedReader.readLine()) != null) {  buffer.append(str);  }  bufferedReader.close();  inputStreamReader.close();  // 释放资源  inputStream.close();  inputStream = null;  httpUrlConn.disconnect();  } catch (ConnectException ce) {  ce.printStackTrace();} catch (Exception e) {  e.printStackTrace();}  return buffer.toString();  }  

调用例子：

public static void main(String[] args) throws Exception {String URL = "https*****";String returnXML = "000";String request = httpRequestXML(URL, "POST",returnXML);System.out.println(request);}