[个人学习笔记]Android 从网络获取json并解析 --Demo

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//网络获取json的方法public String getJsonFromInternet(String url) throws MalformedURLException,IOException {String resultString = "";InputStreamReader isrInputStreamReader = new InputStreamReader(new URL(url).openStream());//从网上获取json的字节流BufferedReader brBufferedReader = new BufferedReader(isrInputStreamReader);//将字节流转换成字符流String line = "";while ((line = brBufferedReader.readLine()) != null) {resultString &#;= line;}return resultString;//读取网上的json&#;式的字符串并返回}//需要特别注意的是获取json的方法需要脱离UI线程使用，//可以使用AsyncTask中doInBackground获取网络jsonString//用json字符串读取内部相关数据{ "weatherinfo": {//需要调用getJSONObject("weatherinfo")来获取下面的数据 "city": "杭州", "city_en": "hangzhou", "date_y": "年6月日", "date": "", "week": "星期四", "fchh": "", "cityid": "", "temp1": "℃~℃", "weather1": "阵雨转阴" }}//这个是从网上获取到的json字符串//从json字符串中获取相关的数据的方法public weather(String json) throws JSONException {// TODO Auto-generated constructor stubJSONObject ja=new JSONObject(json).getJSONObject("weatherinfo");//获取字符串中weatherinfo中的数据并复制给当前的jsonobject对象//这个是获取到jsonstring中只有一个对象数据的情况下获取数据使用的setCity(ja.getString("city"));//从ja对象中获取需要的相关信息setTime(ja.getString("date_y"));setWeek(ja.getString("week"));setWeather(ja.getString("weather1"));setTemp(ja.getString("temp1"));}// 从网上获取json并解析数据后显示在view上的demo//MainActivity.classpackage com.example.testjson;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.MalformedURLException;import java.net.URL;import org.json.JSONException;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.widget.TextView;public class MainActivity extends Activity {private weather mw;private TextView date;private TextView city;private TextView weather;private TextView temp;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);date = (TextView) findViewById(R.id.date);temp = (TextView) findViewById(R.id.temp);city = (TextView) findViewById(R.id.city);weather = (TextView) findViewById(R.id.weather);new backgetjson(date, city, weather, temp).execute(" String getJsonFromInternet(String url) throws MalformedURLException,IOException {String resultString = "";InputStreamReader isrInputStreamReader = new InputStreamReader(new URL(url).openStream());BufferedReader brBufferedReader = new BufferedReader(isrInputStreamReader);String line = "";while ((line = brBufferedReader.readLine()) != null) {resultString &#;= line;}return resultString;}class backgetjson extends AsyncTask<String, Void, String> {private weather mw;private TextView date;private TextView city;private TextView weather;private TextView temp;public backgetjson(TextView d, TextView c, TextView w, TextView t) {// TODO Auto-generated constructor stubdate = d;city = c;weather = w;temp = t;}@Overrideprotected String doInBackground(String... params) {// TODO Auto-generated method stubString jsString = "";try {jsString = getJsonFromInternet(params[0]);} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return jsString;}@Overrideprotected void onPostExecute(String result) {// TODO Auto-generated method stubsuper.onPostExecute(result);try {mw = new weather(result);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}date.setText(mw.getTime());city.setText(mw.getCity());weather.setText(mw.getWeather());temp.setText(mw.getTemp());}}}//weather.classpackage com.example.testjson;import org.json.JSONException;import org.json.JSONObject;public class weather {private String city;private String time;private String week;private String weather;private String temp;public String getCity() {return city;}public void setCity(String city) {this.city = city;}public String getTime() {return time;}public void setTime(String time) {this.time = time;}public String getWeek() {return week;}public void setWeek(String week) {this.week = week;}public String getWeather() {return weather;}public void setWeather(String weather) {this.weather = weather;}public String getTemp() {return temp;}public void setTemp(String temp) {this.temp = temp;}public weather() {// TODO Auto-generated constructor stub}public weather(String json) throws JSONException {// TODO Auto-generated constructor stubJSONObject ja = new JSONObject(json).getJSONObject("weatherinfo");setCity(ja.getString("city"));setTime(ja.getString("date_y"));setWeek(ja.getString("week"));setWeather(ja.getString("weather1"));setTemp(ja.getString("temp1"));}}// 如果获取的json字符串中有如下结构的可以解析成jsonarray{ status: 1, data: -[ -{ id: 1, name: "Tony老师聊shell——环境变量配置文件", picSmall: " picBig: " description: "为你带来shell中的环境变量配置文件", learner: }, -{ id: 2, name: "数学知识在CSS动画中的应用", picSmall: " picBig: " description: "数学知识与CSS结合实现酷炫效果", learner: }, -{ id: 3, name: "Oracle数据库开发必备利器之PL/SQL基础", picSmall: " picBig: " description: "Oracle数据库高级开发必备的基础。", learner: }, -{ id: 4, name: "Android见证消息推送时刻进阶篇", picSmall: " picBig: " description: "Android消息推送就在&#;前，Come on", learner: },}//解析代码如下JSONObject ja=new JSONObject(json);JSONArray jsonarray=ja.getJSONArray("data");for (int i=0;i<jsonarray.length();i&#;&#;){ja=jsonarray.getJSONObject(i);.....//这里得到了一个jsonobject//得到一个jsonobject之后可以直接从里面获取数据。//方法与前面获取数据的方法一样可以从中获取类&#;于一个arraylist的对象}

Demo 下载链接：

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