json数据解析

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首先客户端从服务器端获取json数据

1、利用HttpUrlConnection

复制代码代码如下:

/**

* 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

复制代码代码如下:

/**

* 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"}]

复制代码代码如下:

/**

* 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

复制代码代码如下:

/**

* 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：

复制代码代码如下:

/**

* 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

复制代码代码如下:

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

复制代码代码如下:

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）

复制代码代码如下:

* 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;

}

复制代码代码如下:

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;

}

};

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