java—HTTP請求

 須要依賴如下架包：

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
		<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
			<version>4.5.5</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
		<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpcore</artifactId>
			<version>4.4.9</version>
		</dependency>

 get請求和post請求工具

/**
     * get請求工具類
     * @param url
     * @return
     */
    public static JSONObject doGetStr(String url){
        //建立HTTP請求客戶端
        CloseableHttpClient httpclient = HttpClientBuilder.create().build();
        //建立HTTP  get請求
        HttpGet httpGet = new HttpGet(url);
        //建立返回結果
        JSONObject jsonObject = null;
        //獲取響應結果
        try {
            HttpResponse response = httpclient.execute(httpGet);
            //獲取消息體中的結果
            HttpEntity entity = response.getEntity();
            if(entity != null){
                String strEntity = EntityUtils.toString(entity,"UTF-8");
                jsonObject = JSONObject.fromObject(strEntity);
            }
        } catch (Exception e) {
            System.out.println(new Date()+"GET請求失敗");
            return null;
        }
        return jsonObject;
    }

/**
     * POST請求工具類
     */
    public static JSONObject doPostStr(String url,String strOut){
        //建立HTTP請求客戶端
        CloseableHttpClient httpclient = HttpClientBuilder.create().build();
        //建立Post請求
        HttpPost httpPost = new HttpPost(url);
        //建立返回結果
        JSONObject jsonObject = null;
        //設置請求參數
        try {
            httpPost.setEntity(new StringEntity(strOut,"UTF-8"));
            HttpResponse response = httpclient.execute(httpPost);
            //獲取消息體中的結果
            HttpEntity entity = response.getEntity();
            if(entity != null){
                String strEntity = EntityUtils.toString(entity,"UTF-8");
                jsonObject = JSONObject.fromObject(strEntity);
            }
        } catch (Exception e) {
            System.out.println(new Date()+"POST請求失敗");
            return null;
        }
        return jsonObject;
    }