我如何从URL（JSON）作为字符串获取JSON

Question

我想将此JSON保存在url { https://www.instagram.com/ihanan95/?__a=1 }中，并通过java将其保存为字符串，我尝试使用所有建议，但何时得到空字符串。

Answer 1

You can use Spring's RestTemplate to get the response as String , eg:

RestTemplate restTemplate = new RestTemplate();
String response = restTemplate.getForObject("https://www.instagram.com/ihanan95/?__a=1", String.class);
System.out.println(response);

If you are not allowed to use third party libaries then you can do the same with URLConnection , eg:

URLConnection connection = new URL("https://www.instagram.com/ihanan95/?__a=1").openConnection();
try(Scanner scanner = new Scanner(connection.getInputStream());){
    String response = scanner.useDelimiter("\\A").next();
    System.out.println(response);
}

Answer 2

Read JSON file from remote website.

Example:

URL url = new URL("https://www.instagram.com/ihanan95/?__a=1");
JSONTokener tokener = new JSONTokener(url.openStream());
JSONObject obj = new JSONObject(tokener);
JSONObject data = obj.getJSONObject("user");
String message = data.getString("message");

JSONTokener Doc

Dependencies

<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20090211</version>
</dependency>