使用java创建http请求

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 /**
  *
  * @param requestUrl 请求的链接
  * @param requestMethod 请求方法(GET,POST)
  * @param outputStr 请求参数(可以使json字符串,也可以是xml)
  * @return str(字符串,一般是json字符串,也可以是xml字符串)
  */
 public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {
        StringBuffer buffer = null;
        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, null, 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 conn = (HttpsURLConnection) url.openConnection();
            conn.setSSLSocketFactory(ssf);
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            // 设置请求方式（GET/POST）
            conn.setRequestMethod(requestMethod);
            //设置请求头
            conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("Connection", "Keep-Alive");
            if (null != outputStr) {
                OutputStream outputStream = conn.getOutputStream();
                // 注意编码格式
                outputStream.write(outputStr.getBytes("UTF-8"));
                outputStream.close();
            }
            // 从输入流读取返回内容
            InputStream inputStream = conn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String str = null;
            buffer = new StringBuffer();
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            // 释放资源
            bufferedReader.close();
            inputStreamReader.close();
            inputStream.close();
            conn.disconnect();
        } catch (ConnectException ce) {
            System.out.println("连接服务器错误:"+ce.getMessage());
        } catch (Exception e) {
            System.out.println("创建ssl失败:"+e.getMessage());
        }
        return buffer.toString();
    }