REST和JSON - 将字符串转换为JSON数组 [英] REST and JSON - converting string to JSON array

问题描述

我是JSON和REST的新手。我正在使用一个返回如下字符串的服务器：

I'm new to JSON and REST. I'm working with a server that returns strings like these:

[{"username":"Hello","email":"[e-mail]","credits":"100","twitter_username":""},{"username":"Goodbye","email":"[e-mail]","credits":"0","twitter_username":""}]

我设法将它们打印出来控制台上的字符串，但现在我想将它们转换为JSON数组。到目前为止我的代码没有返回任何错误，但我不知道将什么放入新JSON数组的构造函数中。我一直指的是一位同事发给我的一段代码，其中构造函数是新的JSONArray（响应），但他从未告诉我'回应'是什么。

I've managed to print them out as strings on the console, but now I want to convert them into a JSON array. The code I have so far returns no errors, but I don't know what to put into the constructor for the new JSON array. I've been referring to a piece of code sent to me by a colleague, in which the constructor was new JSONArray(response) but he never told me what 'response' was.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import sun.misc.BASE64Encoder;

public class NetClientGet {

    public static void main(String[] args) {

      try {

        URL url = new URL("http://username:[e-mail]/index.php/api/users/get_users/");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");

        BASE64Encoder enc = new sun.misc.BASE64Encoder();
        String userpassword = "username:password";
        String encoded = enc.encode(userpassword.getBytes());
        conn.setRequestProperty("Authorization", "Basic " + encoded);

        if (conn.getResponseCode() != 200) {
            throw new RuntimeException("Failed : HTTP error code : "
                    + conn.getResponseCode());
        }

        BufferedReader br = new BufferedReader(new InputStreamReader(
            (conn.getInputStream())));

        String output;
        System.out.println("Output from Server .... \n");
        while ((output = br.readLine()) != null) {
            System.out.println(output);
        }

        JSONArray array = new JSONArray(output);

        for (int i =0; i < array.size(); i++) {
            JSONObject row = array.getJSONObject(i);
            String user = row.getString("username");
            System.out.println(user);
        }

        conn.disconnect();

      } catch (MalformedURLException e) {

        e.printStackTrace();

      } catch (IOException e) {

        e.printStackTrace();

      }

    }
}

推荐答案

• 使用 GSON 将字符串格式化为JsonArray


• 然后遍历JsonArray以获取值


• use GSON to format the string as JsonArray
• then traverse the JsonArray to get the values

代码示例

String json = "[{\"username\":\"Hello\",\"email\":\"[e-mail]\",\"credits\":\"100\",\"twitter_username\":\"\"},{\"username\":\"Goodbye\",\"email\":\"[e-mail]\",\"credits\":\"0\",\"twitter_username\":\"\"}]";
JsonArray jArray = new JsonParser().parse(json).getAsJsonArray();
for (int i=0;i<jArray.size();i++) {
    JsonObject jsonObject = jArray.get(i).getAsJsonObject();
    System.out.println(jsonObject.get("username"));
    System.out.println(jsonObject.get("email"));
    System.out.println(jsonObject.get("credits"));
    System.out.println(jsonObject.get("twitter_username"));
    System.out.println("*********");
}

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