Android解析JSON方式(二) 客户端解析SON数据

在上一篇中搭建了服务器端的程序，这篇我们来建立一个Android项目，来访问服务器取得JSON格式数据，并解析JSON数据格式，输出到日志控制台。

我们建立的项目目录结构如下：

运行的界面截图：

当我们分别点击四个按钮，可以看到控制台的输出日志：

以下是源代码：

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=""android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><Buttonandroid:id="@+id/person"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="解析person数据"android:onClick="click"/><Buttonandroid:id="@+id/persons"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="解析persons数据"android:onClick="click"/><Buttonandroid:id="@+id/listString"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="解析listString数据"android:onClick="click"/><Buttonandroid:id="@+id/listMap"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="解析listMap数据"android:onClick="click"/></LinearLayout>MainActivity.javapackage com.json.activity;import java.util.List;import java.util.Map;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import com.json.bean.Person;import com.json.util.HttpUtils;import com.json.util.JsonTools;public class MainActivity extends Activity {private static String PATH = ":8080/JsonProject/servlet/JsonServlet";private static final String TAG = "MainActivity";@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);}public void click(View v){switch (v.getId()) {case R.id.person:String path1=PATH+"?action_flag=person";String jsonString1 = HttpUtils.getJsonContent(path1);Person person = JsonTools.getPerson("person", jsonString1);Log.i(TAG, person.toString());break;case R.id.persons:String path2=PATH+"?action_flag=persons";String jsonString2 = HttpUtils.getJsonContent(path2);List<Person> list2 = JsonTools.getPersons("persons", jsonString2);Log.i(TAG, list2.toString());break;case R.id.listString:String path3=PATH+"?action_flag=listString";String jsonString3 = HttpUtils.getJsonContent(path3);List<String> list3 = JsonTools.getList("listString", jsonString3);Log.i(TAG, list3.toString());break;case R.id.listMap:String path4=PATH+"?action_flag=listMap";String jsonString4 = HttpUtils.getJsonContent(path4);List<Map<String,Object>> list4 = JsonTools.getListMap("listMap", jsonString4);Log.i(TAG, list4.toString());break;}}}Person.javapackage com.json.bean;public class Person {private int id;private String name;private String address;public Person() {super();}public Person(int id, String name, String addrss) {super();this.id = id;this.name = name;this.address = addrss;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return "Person [addrss=" + address + ", id=" + id + ", name=" + name+ "]";}}HttpUtils.javapackage com.json.util;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;public class HttpUtils {public HttpUtils() {}public static String getJsonContent(String path){try {URL url = new URL(path);HttpURLConnection connection = (HttpURLConnection)url.openConnection();connection.setConnectTimeout(3000);connection.setRequestMethod("GET");connection.setDoInput(true);int code = connection.getResponseCode();if(code == 200){return changeInputStream(connection.getInputStream());}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}/** * 将一个输入流转换成指定编码的字符串* @param inputStream * @return */private static String changeInputStream(InputStream inputStream) {String jsonString = "";ByteArrayOutputStream outputStream = new ByteArrayOutputStream();int len = 0;byte[] data = new byte[1024];try {while((len=inputStream.read(data))!=-1){outputStream.write(data,0,len);}jsonString = new String(outputStream.toByteArray());} catch (IOException e) {e.printStackTrace();}return jsonString;}}JsonTools.javapackage com.json.util;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import com.json.bean.Person;/** * 完成对JSON数据的解析 * @author wulianghuan * */public class JsonTools {public JsonTools() {}/** * 获取对象数据 * @param key * @param jsonString * @return */public static Person getPerson(String key,String jsonString){Person person = new Person();try {JSONObject jsonObject = new JSONObject(jsonString);JSONObject personObject = jsonObject.getJSONObject(key);person.setId(personObject.getInt("id"));person.setName(personObject.getString("name"));person.setAddress(personObject.getString("address"));} catch (JSONException e) {e.printStackTrace();}return person;}/** * 获取对象数组数据 * @param key * @param jsonString * @return */public static List<Person> getPersons(String key,String jsonString){List<Person> list = new ArrayList<Person>();try {JSONObject jsonObject = new JSONObject(jsonString);//返回json的数组JSONArray jsonArray = jsonObject.getJSONArray(key);for(int i=0;i<jsonArray.length();i++){JSONObject jsonObject2 = jsonArray.getJSONObject(i);Person person = new Person();person.setId(jsonObject2.getInt("id"));person.setName(jsonObject2.getString("name"));person.setAddress(jsonObject2.getString("address"));list.add(person);}} catch (JSONException e) {e.printStackTrace();}return list;}/** * 获取String数组数据 * @param key * @param jsonString * @return */public static List<String> getList(String key,String jsonString){List<String> list = new ArrayList<String>();try {JSONObject jsonObject = new JSONObject(jsonString);JSONArray jsonArray = jsonObject.getJSONArray(key);for(int i=0;i<jsonArray.length();i++){String msg = jsonArray.getString(i);list.add(msg);}} catch (JSONException e) {e.printStackTrace();}return list;}/** * 获取对象的Map集合数据 * @param key * @param jsonString * @return */public static List<Map<String,Object>> getListMap(String key,String jsonString){List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();try {JSONObject jsonObject = new JSONObject(jsonString);JSONArray jsonArray = jsonObject.getJSONArray(key);for(int i=0;i<jsonArray.length();i++){JSONObject jsonObject2 = jsonArray.getJSONObject(i);Map<String,Object> map = new HashMap<String, Object>();Iterator<String> iterator = jsonObject2.keys();while(iterator.hasNext()){String json_key = iterator.next();Object json_value = jsonObject2.get(json_key);if(json_value==null){json_value = "";}map.put(json_key, json_value);}list.add(map);}} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}return list;}}

版权声明：本文为博主原创文章，未经博主允许不得转载。

，别想一下造出大海，必须先由小河川开始。