android客户端从服务器端获取json数据并解析

今天总结一下：

首先客户端从服务器端获取json数据

1、利用HttpUrlConnection

/**
     * 从指定的URL中获取数组
     * @param urlPath
     * @return
     * @throws Exception
     */
    public static String readParse(String urlPath) throws Exception {  
               ByteArrayOutputStream outStream = new ByteArrayOutputStream();  
               byte[] data = new byte[1024];  
                int len = 0;  
                URL url = new URL(urlPath);  
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
                InputStream inStream = conn.getInputStream();  
                while ((len = inStream.read(data)) != -1) {  
                    outStream.write(data, 0, len);  
                }  
                inStream.close();  
                return new String(outStream.toByteArray());//通过out.Stream.toByteArray获取到写的数据  
            }  

2、利用HttpClient

/**
     * 访问数据库并返回JSON数据字符串
     * 
     * @param params 向服务器端传的参数
     * @param url
     * @return
     * @throws Exception
     */
    public static String doPost(List<NameValuePair> params, String url)
            throws Exception {
        String result = null;
        // 获取HttpClient对象
        HttpClient httpClient = new DefaultHttpClient();
        // 新建HttpPost对象
        HttpPost httpPost = new HttpPost(url);
        if (params != null) {
            // 设置字符集
            HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8);
            // 设置参数实体
            httpPost.setEntity(entity);
        }

        /*// 连接超时
        httpClient.getParams().setParameter(
                CoreConnectionPNames.CONNECTION_TIMEOUT, 3000);
        // 请求超时
        httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,
                3000);*/
        // 获取HttpResponse实例
        HttpResponse httpResp = httpClient.execute(httpPost);
        // 判断是够请求成功
        if (httpResp.getStatusLine().getStatusCode() == 200) {
            // 获取返回的数据
            result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
        } else {
            Log.i("HttpPost", "HttpPost方式请求失败");
        }

        return result;
    }

其次Json数据解析：
json数据：[{"id":"67","biaoTi":"G","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741845270.png","logoLunbo":"http://www.nuoter.com/wtserver/resources/upload/13509015004480.jpg","yuanJia":"0","xianJia":"0"},{"id":"64","biaoTi":"444","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741704400.png","logoLunbo":"http://172.16.1.75:8080/wtserver/resources/upload/13508741738500.png","yuanJia":"0","xianJia":"0"},{"id":"62","biaoTi":"jhadasd","logo":"http://www.nuoter.com/wtserver/resources/upload/13508741500450.png","logoLunbo":"http://172.16.1.75:8080/wtserver/resources/upload/13508741557450.png","yuanJia":"1","xianJia":"0"}]

/**
     * 解析
     * 
     * @throws JSONException
     */
    private static ArrayList<HashMap<String, Object>> Analysis(String jsonStr)
            throws JSONException {
        /******************* 解析 ***********************/
        JSONArray jsonArray = null;
        // 初始化list数组对象
        ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
        jsonArray = new JSONArray(jsonStr);
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            // 初始化map数组对象
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("logo", jsonObject.getString("logo"));
            map.put("logoLunbo", jsonObject.getString("logoLunbo"));
            map.put("biaoTi", jsonObject.getString("biaoTi"));
            map.put("yuanJia", jsonObject.getString("yuanJia"));
            map.put("xianJia", jsonObject.getString("xianJia"));
            map.put("id", jsonObject.getInt("id"));
            list.add(map);
        }
        return list;
    }

 最后数据适配：

1、TextView

/**
 * readParse（String）从服务器端获取数据
 * Analysis（String）解析json数据
 */
    private void resultJson() {
        try {
            allData = Analysis(readParse(url));
            Iterator<HashMap<String, Object>> it = allData.iterator();
            while (it.hasNext()) {
                Map<String, Object> ma = it.next();
                if ((Integer) ma.get("id") == id) {
                    biaoTi.setText((String) ma.get("biaoTi"));
                    yuanJia.setText((String) ma.get("yuanJia"));
                    xianJia.setText((String) ma.get("xianJia"));
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

2、ListView：

/**
     * ListView 数据适配
     */
    private void product_data(){ 
        List<HashMap<String, Object>> lists = null;
        try {
            lists = Analysis(readParse(url));//解析出json数据
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
        for(HashMap<String, Object> news : lists){
            HashMap<String, Object> item = new HashMap<String, Object>();
            item.put("chuXingTianShu", news.get("chuXingTianShu"));
            item.put("biaoTi", news.get("biaoTi"));
            item.put("yuanJia", news.get("yuanJia"));
            item.put("xianJia", news.get("xianJia"));
            item.put("id", news.get("id"));
            
            try {
                bitmap = ImageService.getImage(news.get("logo").toString());//图片从服务器上获取
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            if(bitmap==null){
                Log.i("bitmap", ""+bitmap);
                Toast.makeText(TravelLine.this, "图片加载错误", Toast.LENGTH_SHORT)
                .show();                                         // 显示图片编号
            }
            item.put("logo",bitmap);
            data.add(item);
        }
             listItemAdapter = new MySimpleAdapter1(TravelLine.this,data,R.layout.a_travelline_item,
                        // 动态数组与ImageItem对应的子项
                        new String[] { "logo", "biaoTi",
                                "xianJia", "yuanJia", "chuXingTianShu"},
                        // ImageItem的XML文件里面的一个ImageView,两个TextView ID
                        new int[] { R.id.trl_ItemImage, R.id.trl_ItemTitle,
                                R.id.trl_ItemContent, R.id.trl_ItemMoney,
                                R.id.trl_Itemtoday});
                listview.setAdapter(listItemAdapter);
                //添加点击   
                listview.setOnItemClickListener(new OnItemClickListener() {    
                    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,   
                            long arg3) {   
                        login_publicchannel_trl_sub(arg2);
                    }   
                });
    }

对于有图片的要重写适配器

package com.nuoter.adapterUntil;


import java.util.HashMap;
import java.util.List;


import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Paint;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;


public class MySimpleAdapter1 extends BaseAdapter {  
    private LayoutInflater mInflater;  
    private List<HashMap<String, Object>> list;  
    private int layoutID;  
    private String flag[];  
    private int ItemIDs[];  
    public MySimpleAdapter1(Context context, List<HashMap<String, Object>> list,  
            int layoutID, String flag[], int ItemIDs[]) {  
        this.mInflater = LayoutInflater.from(context);  
        this.list = list;  
        this.layoutID = layoutID;  
        this.flag = flag;  
        this.ItemIDs = ItemIDs;  
    }  
    @Override  
    public int getCount() {  
        // TODO Auto-generated method stub  
        return list.size();  
    }  
    @Override  
    public Object getItem(int arg0) {  
        // TODO Auto-generated method stub  
        return 0;  
    }  
    @Override  
    public long getItemId(int arg0) {  
        // TODO Auto-generated method stub  
        return 0;  
    }  
    @Override  
    public View getView(int position, View convertView, ViewGroup parent) {  
        convertView = mInflater.inflate(layoutID, null);  
       // convertView = mInflater.inflate(layoutID, null);  
        for (int i = 0; i < flag.length; i++) {//备注1  
            if (convertView.findViewById(ItemIDs[i]) instanceof ImageView) {  
                ImageView imgView = (ImageView) convertView.findViewById(ItemIDs[i]);  
                imgView.setImageBitmap((Bitmap) list.get(position).get(flag[i]));///////////关键是这句!!!!!!!!!!!!!!!
 
            }else if (convertView.findViewById(ItemIDs[i]) instanceof TextView) {  
                TextView tv = (TextView) convertView.findViewById(ItemIDs[i]);  
                tv.setText((String) list.get(position).get(flag[i]));  
            }else{
                //...备注2 
            }  
        }  
        //addListener(convertView); 
        return convertView;  
    }  

/*    public void addListener(final View convertView) {
        
        ImageView imgView = (ImageView)convertView.findViewById(R.id.lxs_item_image);
        
        
 
    } */

}  

对于图片的获取，json解析出来的是字符串url："logoLunbo":http://www.nuoter.com/wtserver/resources/upload/13509015004480.jpg 从url获取 图片

ImageService工具类

package com.nuoter.adapterUntil;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;


public class ImageService {
    
    /**
     * 获取网络图片的数据
     * @param path 网络图片路径
     * @return
     */
    public static Bitmap getImage(String path) throws Exception{
        
        /*URL url = new URL(imageUrl);   
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();   
        InputStream is = conn.getInputStream();   
        mBitmap = BitmapFactory.decodeStream(is);*/
        Bitmap bitmap= null;
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();//基于HTTP协议连接对象
        conn.setConnectTimeout(5000);
        conn.setRequestMethod("GET");
        if(conn.getResponseCode() == 200){
            InputStream inStream = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(inStream);
        }
        return bitmap;
    }
    
    /**
     * 读取流中的数据 从url获取json数据
     * @param inStream
     * @return
     * @throws Exception
     */
    public static byte[] read(InputStream inStream) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while( (len = inStream.read(buffer)) != -1){
            outStream.write(buffer, 0, len);
        }
        inStream.close();
        return outStream.toByteArray();
    }


}

上面也将从url处获取网络数据写在了工具类ImageService中方面调用，因为都是一样的。

当然也可以在Activity类中写一个获取服务器图片的函数（当用处不多时）

 /*

     * 从服务器取图片
     * 参数：String类型
     * 返回：Bitmap类型

     */

    public static Bitmap getHttpBitmap(String urlpath) {
        Bitmap bitmap = null;
        try {
            //生成一个URL对象
            URL url = new URL(urlpath);
            //打开连接
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
//            conn.setConnectTimeout(6*1000);
//            conn.setDoInput(true);
            conn.connect();
            //得到数据流
            InputStream inputstream = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(inputstream);
            //关闭输入流
            inputstream.close();
            //关闭连接
            conn.disconnect();
        } catch (Exception e) {
            Log.i("MyTag", "error:"+e.toString());
        }
        return bitmap;
    }

调用：

public ImageView pic;
.....
.....
allData=Analysis(readParse(url));
Iterator<HashMap<String, Object>> it=allData.iterator();
while(it.hasNext()){
Map<String, Object> ma=it.next();
if((Integer)ma.get("id")==id)
{
logo=(String) ma.get("logo");
bigpic=getHttpBitmap(logo);
}
}
pic.setImageBitmap(bigpic);

另附 下载数据很慢时建立子线程并传参：

new Thread() {
            @Override
            public void run() {
                // 参数列表
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("currPage", Integer
                        .toString(1)));
                nameValuePairs.add(new BasicNameValuePair("pageSize", Integer
                        .toString(5)));
                try {
                    String result = doPost(nameValuePairs, POST_URL);                    
                    Message msg = handler.obtainMessage(1, 1, 1, result);
                    handler.sendMessage(msg);                     // 发送消息
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }.start();

        // 定义Handler对象
        handler = new Handler() {
            public void handleMessage(Message msg) {
                switch (msg.what) {
                case 1:{
                    // 处理UI
                    StringBuffer strbuf = new StringBuffer();
                    List<HashMap<String, Object>> lists = null;
                    try {
                        lists = MainActivity.this
                                .parseJson(msg.obj.toString());
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
                    for(HashMap<String, Object> news : lists){
                        HashMap<String, Object> item = new HashMap<String, Object>();
                        item.put("id", news.get("id"));
                        item.put("ItemText0", news.get("name"));
                        
                        try {
                            bitmap = ImageService.getImage(news.get("logo").toString());
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        if(bitmap==null){
                            Log.i("bitmap", ""+bitmap);
                            Toast.makeText(MainActivity.this, "图片加载错误", Toast.LENGTH_SHORT)
                            .show();                                         // 显示图片编号
                        }
                        item.put("ItemImage",bitmap);
                        data.add(item);
                    }
                    
                    //生成适配器的ImageItem <====> 动态数组的元素，两者一一对应
                    MySimpleAdapter saImageItems = new MySimpleAdapter(MainActivity.this, data, 
                            R.layout.d_travelagence_item, 
                            new String[] {"ItemImage", "ItemText0", "ItemText1"}, 
                            new int[] {R.id.lxs_item_image, R.id.lxs_item_text0, R.id.lxs_item_text1});
                    //添加并且显示
                    gridview.setAdapter(saImageItems);
                }
                    break;
                default:
                    break;
                }
                
                
            }
        };