android解析json

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最近客户端需求变更，服务器发送json格式的数据解析，但是我在做javaEE的时候，发现json是可以直接得到List ，class对象这些的，而在本身的android里面，省略了这些，所以这些需要自己来写，个人觉得，如果封装一个工具类就好了，如果使用反射机制就可以封装出来一个，但是实体类的字段就必须是public的！
      下面是这个工具类的代码：

package com.zhangkeinfo.json.util;

import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;
/**
* json util class ,use in for analyzing json
* @author spring sky
* My name :石明政
* QQ : 840950105
* 2011-12-14 15:39:51
*
*/
public class JsonUtil {
    private static final String TAG = "jsonUtil";
    private JSONObject jsonObject;
    private JsonUtil(String json)
    {
        Log.e(TAG, "json="+json);
        jsonObject = getJsonObject(json);
        if(jsonObject==null)
        {
            Log.e(TAG, "jsonobject is null");
        }
    }

    public JsonUtil() {
        super();
    }

    public static JsonUtil newJsonUtil(String json)
    {
        JsonUtil util = new JsonUtil(json);
        return util;
    }
    /**
     * get json object
     * @param json json data
     * @return JOSNObject
     */
    public JSONObject getJsonObject(String json)
    {
        JSONObject jsonObject = null;
        try {
            jsonObject = new JSONObject(json);
        } catch (JSONException e) {
            Log.e(TAG, "create jsonobject exception");
            e.printStackTrace();
        }
        return jsonObject;
    }
    /**
     * get String data
     * @param json json data
     * @param key param
     * @return String data
     * @throws JSONException
     */
    public String getString(String key) throws JSONException
    {
        if(jsonObject!= null)
        {
            return jsonObject.getString(key);
        }else{
            return null;
        }

    }
    /**
     * get String data
     * @param json json data
     * @param key param
     * @return int data
     * @throws JSONException
     */
    public int getInt(String key) throws JSONException
    {
        if(jsonObject!= null)
        {
            return jsonObject.getInt(key);
        }else{
            return -1;
        }

    }
    /**
     * get Double data
     * @param json json data
     * @param key param
     * @return double data
     * @throws JSONException
     */
    public double getDouble(String key) throws JSONException
    {
        if(jsonObject!= null)
        {
            return jsonObject.getDouble(key);
        }else{
            return -1;
        }

    }
    /**
     * This Method use in jsonObject get current class with object
     * @param jsonObject
     * @param c class
     * @return object
     * @throws Exception
     */
    public Object getObject(Class<?> c) throws Exception
    {
        if(jsonObject!=null)
        {
            return getObject(c.getSimpleName().toLowerCase(),c);
        }else{
            return null;
        }
    }
    /**
     * This Method use in jsonObject get current class with object
     * @param jsonObject
     * @param key   query key
     * @param c class
     * @return object
     * @throws Exception
     */
    public Object getObject(String key,Class<?> c) throws Exception
    {
        if(jsonObject!=null)
        {
            return getObject(jsonObject, key, c);
        }else{
            return null;
        }
    }
    public Object getObject(JSONObject jsonObject,Class<?> c) throws Exception
    {
        return getObject(jsonObject, c.getSimpleName().toLowerCase(), c);
    }
    /**
     * This Method use in jsonObject get current class with object
     * @param jsonObject
     * @param key   query key
     * @param c class
     * @return object
     * @throws Exception
     */
    public Object getObject(JSONObject jsonObject, String key,Class<?> c) throws Exception
    {
        Log.e(TAG,"key == " + key);
        Object bean =null ;

        if(jsonObject!=null)
        {
            JSONObject jo = null;
            if(key!=null)
            {
                 jo = jsonObject.getJSONObject(key);
            }else{
                jo = jsonObject;
            }
            if(jo!=null)
            {
                if(c.equals(null))
                {
                    Log.e(TAG, "class is null");
                    bean = jo.get(key);
                }else{
                    bean = c.newInstance();
                    Field[] fs = c.getDeclaredFields();
                    for (int i = 0; i < fs.length; i++) {
                        Field f = fs[i];
                        f.setAccessible(true);
                        Type type = f.getGenericType();
                        String value = jo.getString(f.getName());
                        Log.e(TAG,f.getName()+"="+value);
                        if(type.equals(int.class))
                        {
                            f.setInt(bean,Integer.valueOf(value));
                        }else if(type.equals(double.class)){
                            f.setDouble(bean, Double.valueOf(value));
                        }else{
                            f.set(bean,value);
                        }
                    }
                }
            }else{
                Log.e(TAG, "in jsonobject not key ");
            }
        }else{
            Log.e(TAG, "current param jsonobject is null");
        }
        return bean;
    }
    /**
     * This method use in jsonObject get list object
     * @param key list key
     * @param objectKey object key
     * @param c object
     * @return   list
     * @throws Exception
     */
    public List<Object> getList(String key ,Class<?> c) throws Exception
    {
        List<Object> list = null;
        if(jsonObject!=null)
        {
            JSONArray jsonArray = jsonObject.getJSONArray(key);
            if(!jsonArray.isNull(0))
            {
                list = new ArrayList<Object>();
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject jsObject = jsonArray.getJSONObject(i);
                    Object object = getObject(jsObject, null, c);
                    list.add(object);
                }
            }
        }
        return list;
    }
    /**
     * Test class field value
     * @param c
     * @param classObject
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     */
    public static String getFieldValue(Class<?> c,Object classObject) throws IllegalArgumentException, IllegalAccessException
    {
        StringBuffer sb = new StringBuffer();
        Field[] fs = c.getFields();
        for (int i = 0; i < fs.length; i++) {
            String s = fs[i].getName()+"="+fs[i].get(classObject);
            sb.append(s).append("\n");
        }
//      Log.e(TAG, sb.toString());
        return sb.toString();
    }
}

一个测试的实体类：

wallpaper ：

package com.zhangkeinfo.json.model.response;

public class Wallpaper{
    public int id;
    public String name;
    public int rank;
    public String img;
    public String preview1url;
    public String preview2url;
    public String preview3url;
    public String msg;
    public int ptotal;
}

Price:

package com.zhangkeinfo.json.model.response;

public class Price {
    public int id;
    public int price ;
    public String name;
}

解析测试：

package com.zhangkeinfo.json;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.zhangkeinfo.json.model.request.ZmxURL;
import com.zhangkeinfo.json.model.response.Price;
import com.zhangkeinfo.json.model.response.Wallpaper;
import com.zhangkeinfo.json.network.NetWorkUtil;
import com.zhangkeinfo.json.util.JsonUtil;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity1 extends Activity implements OnClickListener{
    private static final String TAG = "MainActivity";
    Button button1,button2;
    TextView text;
    /**
     * 测试的json数据
     */
    public String json = "{\"id\":\"17\",\"res\":\"1\",\"wallpaper\":{\"id\":\"50\",\"name\":\"壁纸1\",\"rank\":\"0\",\"img\":\"img/a.png\",\"preview1url\":\"img/a.png\",\"preview2url\":\"img/a.png\",\"preview3url\":\"img/a.png\",\"msg\":\"\",\"ptotal\":\"1\"},\"price\":[{\"id\":\"1\",\"price\":\"1\",\"name\":\"点播\"},{\"id\":\"2\",\"price\":\"6\",\"name\":\"包月\"}]}";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        button1 = (Button) this.findViewById(R.id.button1);
        button1.setOnClickListener(this);

    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button1:
            try {
                StringBuffer sb = new StringBuffer();
                /**
                 * 得到实例对象
                 */
                JsonUtil util1 = JsonUtil.newJsonUtil(json);
                /*
                 * 得到list对象
                 */
                List<Object> list = util1.getList("prices", Price.class);
                for(int i =0 ;i< list.size();i++)
                {
                    Price price = (Price) list.get(i);
                    sb.append(JsonUtil.getFieldValue(Price.class, price));
                }
                /**
                 * 得到对象
                 */
                Wallpaper wallpaper = (Wallpaper) util1.getObject( Wallpaper.class);
                if(wallpaper!=null)
                {
                    /**
                     * 反射得到字段的内容
                     */
                    Field[] fs = Wallpaper.class.getFields();
                    for (int i = 0; i < fs.length; i++) {
                        String s = fs[i].getName()+"="+fs[i].get(wallpaper);
                        sb.append(s).append("\n");
                    }
                }else{
                    sb.append("wallpaper is null");
                }
                text.setText(sb.toString());

            } catch (Exception e) {
                e.printStackTrace();
            }
            break;
        }

    }
}