How to parse JSON response from an API url using https request in java?

Question

how to parse the JSON response from an api url using java?如何使用 Z93F725A07423FE1C8F46ZD4 解析来自 api url 的 JSON 响应？ When I run the below code I am getting SocketTimeoutException.当我运行下面的代码时，我得到了 SocketTimeoutException。 but when browse the URL in the Chrome and Microsoft Edge i am getting the JSON data.但是当在 Chrome 和 Microsoft Edge 中浏览 URL 时，我得到了 JSON 数据。

url:"https://www.nseindia.com/api/quote-derivative?symbol=RELIANCE" (use only for testing purpose. not for commercial use) url：“https://www.nseindia.com/api/quote-derivative?symbol=RELIANCE”（仅用于测试目的。不可用于商业用途）

Java Code: Java 代码：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import org.json.JSONObject;



public class HTTP_Request {

    public static void main(String[] args) {
        try {
        Send_HTTP_Request.call_me();
    } catch (Exception e) {
        e.printStackTrace();
    }
    }
    
    public static void call_me() throws Exception {
    
        String url ="https://www.nseindia.com/api/quote-derivative?symbol=RELIANCE";
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        // optional default is GET
        con.setRequestMethod("GET");
        //add request header
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'GET' request to URL : " + url);
        System.out.println("Response Code : " + responseCode);
        BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        
        //print in String
        System.out.println(response.toString());
        
        //Read JSON response and print
       // JSONObject myResponse = new JSONObject(response.toString());
       // System.out.println("result after Reading JSON Response");
       // System.out.println("origin- "+myResponse.getString("origin"));
         
        }
}

Answer 1

look what happens when you call the provided url from a shell curl:看看当您从 shell curl 调用提供的 url 时会发生什么：

> $ curl 'https://www.nseindia.com/api/quote-derivative?symbol=RELIANCE'                                                 [±master ●●▴]
<HTML><HEAD>
<TITLE>Access Denied</TITLE>
</HEAD><BODY>
<H1>Access Denied</H1>

You don't have permission to access "http&#58;&#47;&#47;www&#46;nseindia&#46;com&#47;api&#47;quote&#45;derivative&#63;" on this server.<P>
Reference&#32;&#35;18&#46;15b5655f&#46;1595338785&#46;264b3809
</BODY>
</HTML>

So, I guess nseindia is blocking the request because is not coming from a browser.所以，我猜 nseindia 阻止了请求，因为它不是来自浏览器。 But, if you try this:但是，如果你试试这个：

curl 'https://www.nseindia.com/api/quote-derivative?symbol=RELIANCE' -H 'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' -H 'Accept-Language: en-US,en;q=0.5' --compressed -H 'Connection: keep-alive' -H 'Cookie: ak_bmsc=D709927FAB6A44F1C243E20E9199ABA35F65B5158B040000E1EF165F44B95756~plIifDJa9J1EHznQiR/zQpjmGEFWOE88N83Yuqa0oOcgvvYh7eLlgD5MSFVhCZZOObVMZ7UDwEzmOQ2V2lJ6W9pPf6zEbQT1Je27i6h3hrAIyBYFMplV1EDo7rSLxXmCk+HGL3ynHmuPJsePDPD7WTljjTMnM1qpvixsCMEtM1BlmVmuXQijd8cKjWxLeLaf/cNAEJB6VC7SXOq+j6uj6oi9xF/Z2NYB905XnUg9YppXM=' -H 'Upgrade-Insecure-Requests: 1' -H 'Pragma: no-cache' -H 'Cache-Control: no-cache'

you get a json in the response.你在响应中得到一个 json 。

{"info":{"symbol":"RELIANCE","companyName":"Reliance Industries Limited",.......}

So you need to add a couple of HTTP Headers to your request, something like:因此，您需要在请求中添加几个 HTTP 标头，例如：

con.setRequestProperty("User-Agent", "Mozilla/5.0");
con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
con.setRequestProperty("Accept", "text/html");

How to parse JSON response from an API url using https request in java?

问题描述

1 个解决方案

解决方案1
0 已采纳 2020-07-21 13:50:34

How to parse JSON response from an API url using https request in java?

问题描述

1 个解决方案

解决方案1 0 已采纳 2020-07-21 13:50:34

解决方案1
0 已采纳 2020-07-21 13:50:34