Json----Json解析

package com.android.myjson;import java.util.List;import java.util.Map;import com.android.myjson.domain.Person;import com.android.myjson.http.HttpUtils;import com.android.myjson.json.JsonTools;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class Main extends Activity implements OnClickListener {/** Called when the activity is first created. */private Button person, persons, liststring, listmap;private static final String TAG = "Main";@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);person = (Button) this.findViewById(R.id.person);persons = (Button) this.findViewById(R.id.persons);liststring = (Button) this.findViewById(R.id.liststring);listmap = (Button) this.findViewById(R.id.listmap);person.setOnClickListener(this);persons.setOnClickListener(this);liststring.setOnClickListener(this);listmap.setOnClickListener(this);}public void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.person:String path = "http://192.168.0.102:8080/jsonProject/servlet/JsonAction?action_flag=person";String jsonString = HttpUtils.getJsonContent(path);Person person = JsonTools.getPerson("person", jsonString);Log.i(TAG, person.toString());break;case R.id.persons:String path2 = "http://192.168.0.102:8080/jsonProject/servlet/JsonAction?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 = "http://192.168.0.102:8080/jsonProject/servlet/JsonAction?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 = "http://192.168.0.102:8080/jsonProject/servlet/JsonAction?action_flag=listmap";String jsonString4 = HttpUtils.getJsonContent(path4);List<Map<String, Object>> list4 = JsonTools.listKeyMaps("listmap",jsonString4);Log.i(TAG, list4.toString());break;}}}

package com.android.myjson.http;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;public class HttpUtils {public HttpUtils() {// TODO Auto-generated constructor stub}public static String getJsonContent(String url_path) {try {URL url = new URL(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 (Exception e) {// TODO: handle exception}return "";}private static String changeInputStream(InputStream inputStream) {// TODO Auto-generated method stubString 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) {// TODO Auto-generated catch blocke.printStackTrace();}return jsonString;}}

关键类：

JSONObject jsonObject = new JSONObject(jsonString);// 返回json的数组

JSONArray jsonArray = jsonObject.getJSONArray(key);

 

package com.android.myjson.json;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.JSONObject;import com.android.myjson.domain.Person;/** * 完成对json数据的解析 *  * @author jack *  */public class JsonTools {public JsonTools() {// TODO Auto-generated constructor stub}public static Person getPerson(String key, String jsonString) {Person person = new Person();try {JSONObject jsonObject = new JSONObject(jsonString);JSONObject personObject = jsonObject.getJSONObject("person");person.setId(personObject.getInt("id"));person.setName(personObject.getString("name"));person.setAddress(personObject.getString("address"));} catch (Exception e) {// TODO: handle exception}return person;}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 (Exception e) {// TODO: handle exception}return list;}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 (Exception e) {// TODO: handle exception}return list;}public static List<Map<String, Object>> listKeyMaps(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 (Exception e) {// TODO: handle exception}return list;}}

 

package com.android.myjson.domain;public class Person {private int id;private String name;public Person(int id, String name, String address) {super();this.id = id;this.name = name;this.address = address;}private String address;public int getId() {return id;}@Overridepublic String toString() {return "Person [address=" + address + ", id=" + id + ", name=" + name+ "]";}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;}public Person() {// TODO Auto-generated constructor stub}}