java后台http請求方式

長時間沒有寫這方面的代碼，突然提筆對於http的請求方式代碼不知道如何下手，特此記錄一下

public JSONObject  doPost(String url) throws IOException {
    HttpClient httpClient = new HttpClient();
    PostMethod postMethod = new PostMethod(url);

    postMethod.addRequestHeader("accept", "*/*");
    postMethod.addRequestHeader("connection", "Keep-Alive");
    //設置json格式傳送
    postMethod.addRequestHeader("Content-Type", "application/json;charset=utf-8");
    //必須設置下面這個Header
    postMethod.addRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36");
    //添加請求參數
    JSONObject jsonObject = new JSONObject();
    jsonObject.put("url", "www.baidu.com");
    RequestEntity se = new StringRequestEntity(jsonObject.toString(), "application/json", "utf-8");
    postMethod.setRequestEntity(se);
    httpClient.executeMethod(postMethod);
    String responseMsg = postMethod.getResponseBodyAsString().trim();
    JSONObject returnJson = JSONObject.parseObject(responseMsg);
    return returnJson;
}

http請求方式有多種，參考鏈接：https://www.cnblogs.com/hhhshct/p/8523697.html