java 发送http请求

最近做微信，需要发送很多的http请求获取json格式的返回信息

 /**
     * 
     * java http请求获取json
     * 
     * @param requestUrl
     * @param requestMethod
     * @param outputStr
     * @return
     */
    public static JSONObject httpsRequest(String requestUrl, String requestMethod, String outputStr) {
        JSONObject jsonObject = 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 MyTrustManager() };
            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 conn = (HttpsURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setSSLSocketFactory(ssf);
            // 设置请求方式（GET/POST）
            conn.setRequestMethod(requestMethod);
            if ("GET".equalsIgnoreCase(requestMethod))
                conn.connect();
            // 当outputStr不为null时向输出流写数据
            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;
            StringBuffer buffer = new StringBuffer();
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            // 释放资源
            bufferedReader.close();
            inputStreamReader.close();
            inputStream.close();
            inputStream = null;
            conn.disconnect();
            jsonObject = JSONObject.fromObject(buffer.toString());
        } catch (ConnectException ce) {
            logger.error("连接超时：{}", ce);
        } catch (Exception e) {
            logger.error("https请求异常：{}", e);
        }
        return jsonObject;
    }

post:

public static String post(String url, Map<String, String> headMap,
			Map<String, String> paramMap) {
		List<NameValuePair> params = new ArrayList<NameValuePair>();
		for (Map.Entry<String, String> entry : paramMap.entrySet()) {
			params.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
		}
		CloseableHttpClient httpclient = HttpClients.createDefault();
		HttpPost post = new HttpPost(url);
		for (Map.Entry<String, String> entry : headMap.entrySet()) {
			post.addHeader(entry.getKey(), entry.getValue());
		}
		List<NameValuePair> nvps = new ArrayList<NameValuePair>();
		Set<String> keySet = paramMap.keySet();
		for (String key : keySet) {
			nvps.add(new BasicNameValuePair(key, paramMap.get(key)));
		}
		CloseableHttpResponse response;
		String result = "";
		try {
			post.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
			response = httpclient.execute(post);
			int reCode = response.getStatusLine().getStatusCode();
			if (reCode == 200) {
				HttpEntity rspEntity = response.getEntity();
				if (rspEntity != null) {
					result = EntityUtils.toString(rspEntity, "utf-8");
				}
				System.out.println("返回代码：" + reCode);
			} else {
				HttpEntity rspEntity = response.getEntity();
				if (rspEntity != null) {
					result = EntityUtils.toString(rspEntity, "utf-8");
				}
				System.err.println("返回错误代码：" + reCode);
			}
			response.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
	public static String postEntity(String url,Object obj){
	    CloseableHttpClient httpclient = HttpClients.createDefault(); 
	    HttpPost post = new HttpPost(url);
		CloseableHttpResponse response;
		String result = "";
		try {
			post.addHeader("Content-type", "application/json");
			post.setEntity(new StringEntity(JSON.toJSONString(obj), "utf-8"));  
			response = httpclient.execute(post);
			int reCode = response.getStatusLine().getStatusCode();
			if(reCode == 200){
				HttpEntity rspEntity = response.getEntity();
			    if (rspEntity != null) {
			    	result = EntityUtils.toString(rspEntity,"utf-8");
			    }
			    System.out.println("返回代码："+reCode);
			}else{
				HttpEntity rspEntity = response.getEntity();
			    if (rspEntity != null) {
			    	result = EntityUtils.toString(rspEntity,"utf-8");
			    }
				System.err.println("返回错误代码："+reCode);
			}
		    response.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

get:

public static String get(String url, Map<String, String> headMap,
			Map<String, String> paramMap) {
		List<NameValuePair> params = new ArrayList<NameValuePair>();
		for (Map.Entry<String, String> entry : paramMap.entrySet()) {
			params.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
		}
		String param = URLEncodedUtils.format(params, "UTF-8");
		CloseableHttpClient httpclient = HttpClients.createDefault();
		HttpGet get = new HttpGet(url + "?" + param);
		System.out.println("get真实地址:"+url + "?" + param);
		for (Map.Entry<String, String> entry : headMap.entrySet()) {
			get.addHeader(entry.getKey(), entry.getValue());
		}
		CloseableHttpResponse response;
		String result = "";
		try {
			response = httpclient.execute(get);
			int reCode = response.getStatusLine().getStatusCode();
			if (reCode == 200) {
				HttpEntity rspEntity = response.getEntity();
				if (rspEntity != null) {
					result = EntityUtils.toString(rspEntity, "utf-8");
				}
				System.out.println("返回代码：" + reCode);
			} else {
				HttpEntity rspEntity = response.getEntity();
				if (rspEntity != null) {
					result = EntityUtils.toString(rspEntity, "utf-8");
				}
				System.err.println("返回错误代码：" + reCode);
			}
			response.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}