读写 JSON 数据

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JSON 很受欢迎，在 Android 上如何读写呢，请看以下代码

[代码] 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. */@Overridepublic 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();}}

[代码] 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);}