ANDROID与.Net之间JSON实践
Asp.Net端：
JsonHelper.cs
using System.Runtime.Serialization.Json; using System.IO; using System.Text; namespace NetJSON { /// <summary> /// JSON序列化和反序列化辅助类 /// </summary> public class JsonHelper { /// <summary> /// JSON序列化 /// </summary> public static string JsonSerializer<T>(T t) { DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T)); MemoryStream ms = new MemoryStream(); ser.WriteObject(ms, t); string jsonString = Encoding.UTF8.GetString(ms.ToArray()); ms.Close(); return jsonString; } /// <summary> /// JSON反序列化 /// </summary> public static T JsonDeserialize<T>(string jsonString) { DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T)); MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)); T obj = (T)ser.ReadObject(ms); return obj; } } }
JSON.aspx.cs
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Collections; namespace NetJSON { public partial class JSON : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string flag = Request["action_flag"]; string jsonStr = ""; switch (flag) { case "person": var p = new Person(); p.Id = 100; p.Name = "张三"; p.Address = "北京朝阳"; jsonStr = JsonHelper.JsonSerializer<Person>(p); break; case "persons": List<Person> persons = new List<Person>(); persons.Add(new Person { Id = 101, Name = "李四", Address = "北京昌平" }); persons.Add(new Person { Id = 102, Name = "王五", Address = "北京顺义" }); persons.Add(new Person { Id = 103, Name = "赵六", Address = "天津南开" }); jsonStr = JsonHelper.JsonSerializer<List<Person>>(persons); break; case "stringList": List<string> strs = new List<string>(); strs.Add("china"); strs.Add("beijing"); strs.Add("chaoyang"); jsonStr = JsonHelper.JsonSerializer<List<string>>(strs); break; case "listMap": List<Hashtable> listMap = new List<Hashtable>(); Hashtable ht = new Hashtable(); ht.Add("Id", 203); ht.Add("Name", "老赵"); ht.Add("Age", 36); listMap.Add(ht); ht = new Hashtable(); ht.Add("Id", 204); ht.Add("Name", "老张"); ht.Add("Age", 46); ht.Add("Married", true); listMap.Add(ht); List<SortedDictionary<string, object>> list = new List<SortedDictionary<string, object>>(); SortedDictionary<string, object> dict = new SortedDictionary<string, object>(); dict.Add("Id", 334); dict.Add("Name", "XYZ"); list.Add(dict); dict = new SortedDictionary<string, object>(); dict.Add("Id", 334); dict.Add("Address", "XYZ"); dict.Add("Married", false); list.Add(dict); jsonStr = JsonHelper.JsonSerializer<List<SortedDictionary<string, object>>>(list); break; } Response.Write(jsonStr); Response.End(); } } public class Person { public int Id { get; set; } public string Name { get; set; } public string Address { get; set; } } }
返回的JSON结果：
person:
{"Address":"北京朝阳","Id":100,"Name":"张三"}
persons:
[{"Address":"北京昌平","Id":101,"Name":"李四"},{"Address":"北京顺义","Id":102,"Name":"王五"},{"Address":"天津南开","Id":103,"Name":"赵六"}]
stringList:
["china","beijing","chaoyang"]
listMap:
[[{"Key":"Id","Value":201},{"Key":"Name","Value":"老赵"}],[{"Key":"Id","Value":203},{"Key":"Birthday","Value":"\/Date(232214400000+0800)\/"},{"Key":"Married","Value":true}]]
Android端：
Person.java
package com.example.netjson; 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; } @Override public String toString() { return "Person [addrss=" + address + ", id=" + id + ", name=" + name + "]"; } }
JSONTool.java
package com.example.netjson; 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; /** * 完成对JSON数据的解析 * * @author wulianghuan * */ public class JSONTool { public JSONTool() { } public static String createjsonString(String key, Object value) { JSONObject jsonObject = new JSONObject(); try { jsonObject.put(key, value); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return jsonObject.toString(); } /** * 获取对象数据 * * @param key * @param jsonString * @return */ public static Person getPerson(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 jsonString) { List<Person> list = new ArrayList<Person>(); try { JSONArray jsonArray = new JSONArray(jsonString); // 返回json的数组 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 jsonString) { List<String> list = new ArrayList<String>(); try { JSONArray jsonArray = new JSONArray(jsonString); 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 jsonString) { List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); try { JSONArray jsonArray = new JSONArray(jsonString); for (int i = 0; i < jsonArray.length(); i++) { JSONArray jsonArray2 = jsonArray.getJSONArray(i); Map<String, Object> tmpMap = new HashMap<String, Object>(); for (int j = 0; j < jsonArray2.length(); j++) { Map<String, Object> map = new HashMap<String, Object>(); JSONObject jsonObject2 = jsonArray2.getJSONObject(j); 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); } tmpMap.put(map.get("Key").toString(), map.get("Value")); } list.add(tmpMap); } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return list; } }
HTTPUtils.java
package com.example.netjson; 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(30000); 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; } }
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <Button android:id="@+id/person" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="click" android:text="person" /> <Button android:id="@+id/persons" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="click" android:text="persons" /> <Button android:id="@+id/stringList" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="click" android:text="stringList" /> <Button android:id="@+id/listMap" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="click" android:text="listMap" /> <TextView android:id="@+id/tvShow" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> </LinearLayout> </RelativeLayout>
MainActivity.java
package com.example.netjson; import java.util.List; import java.util.Map; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.util.Log; import android.view.Menu; import android.view.View; import android.widget.TextView; public class MainActivity extends Activity { String PATH = "http://192.168.0.102:7020/JSON.aspx"; String TAG = "JSON"; TextView tvShow; Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 0x123: tvShow.setText(msg.obj.toString()); break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tvShow = (TextView) findViewById(R.id.tvShow); } public void click(final View v) { final int vId = v.getId(); new Thread() { public void run() { asynCall(vId); } }.start(); } private void asynCall(int viewId) { String jsonStr = ""; switch (viewId) { case R.id.person: String path1 = PATH + "?action_flag=person"; String jsonString1 = HTTPUtils.getJsonContent(path1); Person person = JSONTool.getPerson(jsonString1); jsonStr = person.toString(); break; case R.id.persons: String path2 = PATH + "?action_flag=persons"; String jsonString2 = HTTPUtils.getJsonContent(path2); List<Person> list2 = JSONTool.getPersons(jsonString2); jsonStr = list2.toString(); break; case R.id.stringList: String path3 = PATH + "?action_flag=stringList"; String jsonString3 = HTTPUtils.getJsonContent(path3); List<String> list3 = JSONTool.getList(jsonString3); jsonStr = list3.toString(); break; case R.id.listMap: String path4 = PATH + "?action_flag=listMap"; String jsonString4 = HTTPUtils.getJsonContent(path4); List<Map<String, Object>> list4 = JSONTool.getListMap(jsonString4); jsonStr = list4.toString(); break; } Message msg = new Message(); msg.what = 0x123; msg.obj = jsonStr; handler.sendMessage(msg); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
Manifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.netjson" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /> <uses-permission android:name="android.permission.INTERNET" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.netjson.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
输出结果：
Person [addrss=北京朝阳, id=100, name=张三]
[Person [addrss=北京昌平, id=101, name=李四], Person [addrss=北京顺义, id=102, name=王五], Person [addrss=天津南开, id=103, name=赵六]]
[china, beijing, chaoyang]
[{Name=老赵, Id=201}, {Married=true, Birthday=/Date(232214400000+0800)/, Id=203}]