Welcome

首页 / 移动开发 / Android / Android实现读写JSON数据的方法

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。