Android实现读写JSON数据的方法
16lz
2021-01-23
本文实例讲述了Android实现读写JSON数据的方法。分享给大家供大家参考。具体如下：
1. 解析JSON：
package de.vogella.android.twitter.json;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.StatusLine;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.json.JSONArray;import org.json.JSONObject;import android.app.Activity;import android.os.Bundle;import android.util.Log;public class ParseJSON extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); String readTwitterFeed = readTwitterFeed(); try { JSONArray jsonArray = new JSONArray(readTwitterFeed); Log.i(ParseJSON.class.getName(), "Number of entries " + jsonArray.length()); for (int i = 0; i < jsonArray.length(); i++) { JSONObject jsonObject = jsonArray.getJSONObject(i); Log.i(ParseJSON.class.getName(), jsonObject.getString("text")); } } catch (Exception e) { e.printStackTrace(); } } public String readTwitterFeed() { StringBuilder builder = new StringBuilder(); HttpClient client = new DefaultHttpClient(); HttpGet httpGet = new HttpGet( "http://twitter.com/statuses/user_timeline/vogella.json"); try { HttpResponse response = client.execute(httpGet); StatusLine statusLine = response.getStatusLine(); int statusCode = statusLine.getStatusCode(); if (statusCode == 200) { HttpEntity entity = response.getEntity(); InputStream content = entity.getContent(); BufferedReader reader = new BufferedReader( new InputStreamReader(content)); String line; while ((line = reader.readLine()) != null) { builder.append(line); } } else { Log.e(ParseJSON.class.toString(), "Failed to download file"); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return builder.toString(); }} 2. 生成JSON：
public void writeJSON() { JSONObject object = new JSONObject(); try { object.put("name", "Jack Hack"); object.put("score", new Integer(200)); object.put("current", new Double(152.32)); object.put("nickname", "Hacker"); } catch (JSONException e) { e.printStackTrace(); } System.out.println(object);} 希望本文所述对大家的Android程序设计有所帮助。
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