JSONParser deprecated

本文关键字：deprecated JSONParser 更新时间：2023-09-26

***之间的所有文本都已弃用。我不知道该用什么来代替它。你能帮我一下吗？我是这方面的初学者，只是制作一个应用程序来与我的raspberryPi通信。

公共类JSONParser｛

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
                                  ContentValues params) {
    // Making HTTP request
    try {
        // check for request method
        if(method == "POST"){
            // request method is POST
            // defaultHttpClient
            **DefaultHttpClient** httpClient = new **DefaultHttpClient**();
            **HttpPost** httpPost = new **HttpPost**(url);
            httpPost.setEntity(new **UrlEncodedFormEntity**(params));
            **HttpResponse** httpResponse = httpClient.execute(httpPost);
            **HttpEntity** httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        }else if(method == "GET"){
            // request method is GET
            **DefaultHttpClient** httpClient = new **DefaultHttpClient**();
            String paramString = **URLEncodedUtils**.format(params, "utf-8");
            url += "?" + paramString;
            **HttpGet** httpGet = new **HttpGet**(url);
            **HttpResponse** httpResponse = httpClient.execute(httpGet);
            **HttpEntity** httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        }

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (**ClientProtocolException** e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "'n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }
    // try parse the string to a JSON object
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }
    // return JSON String
    return jObj;
}

这里是使用HttpURLConnection:的JSONParser类的一个完全可用的替换

import android.util.Log;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
public class JSONParser {
    String charset = "UTF-8";
    HttpURLConnection conn;
    DataOutputStream wr;
    StringBuilder result = new StringBuilder();
    URL urlObj;
    JSONObject jObj = null;
    StringBuilder sbParams;
    String paramsString;
    public JSONObject makeHttpRequest(String url, String method,
                                      HashMap<String, String> params) {
        sbParams = new StringBuilder();
        int i = 0;
        for (String key : params.keySet()) {
            try {
                if (i != 0){
                    sbParams.append("&");
                }
                sbParams.append(key).append("=")
                        .append(URLEncoder.encode(params.get(key), charset));
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            i++;
        }
        if (method.equals("POST")) {
            // request method is POST
            try {
                urlObj = new URL(url);
                conn = (HttpURLConnection) urlObj.openConnection();
                conn.setDoOutput(true);
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Accept-Charset", charset);
                conn.setReadTimeout(10000);
                conn.setConnectTimeout(15000);
                conn.connect();
                paramsString = sbParams.toString();
                wr = new DataOutputStream(conn.getOutputStream());
                wr.writeBytes(paramsString);
                wr.flush();
                wr.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        else if(method.equals("GET")){
            // request method is GET
            if (sbParams.length() != 0) {
                url += "?" + sbParams.toString();
            }
            try {
                urlObj = new URL(url);
                conn = (HttpURLConnection) urlObj.openConnection();
                conn.setDoOutput(false);
                conn.setRequestMethod("GET");
                conn.setRequestProperty("Accept-Charset", charset);
                conn.setConnectTimeout(15000);
                conn.connect();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try {
            //Receive the response from the server
            InputStream in = new BufferedInputStream(conn.getInputStream());
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            String line;
            while ((line = reader.readLine()) != null) {
                result.append(line);
            }
            Log.d("JSON Parser", "result: " + result.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
        conn.disconnect();
        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(result.toString());
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }
        // return JSON Object
        return jObj;
    }
}

我的博客上有更多信息，例如AsyncTasks。请注意，使用此实现，您将需要在HashMap中构造任何参数。