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}]

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