php android json

//android

public class GoWinHttp {    //通过post获得数据    public static String postHttpData(String url,List<NameValuePair> nameValuePairs)    {        String resultStr=null;        HttpClient httpclient = new DefaultHttpClient();        HttpPost httppost = new HttpPost(url);         try {                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));                HttpResponse response;                 response=httpclient.execute(httppost);                     resultStr=EntityUtils.toString(response.getEntity());            } catch (UnsupportedEncodingException e) {                Log.d(url, "UnsupportedEncodingException");                e.printStackTrace();            } catch (ClientProtocolException e) {                Log.d(url, "ClientProtocolException");                e.printStackTrace();            } catch (IOException e) {                Log.d(url, "IOException");                e.printStackTrace();            }            return resultStr;     }}

List<NameValuePair> nameValuePairs  构建  这是，post给php的参数nameValuePairs.add(new BasicNameValuePair("key","value"));

//解析方法，主要是,这里有一点特殊，就是开始第一个json对象是jsonObject 和JSONArray 有一点不同，jsonObject 是指json最开始以{开始的，而以[开始的是JSONArray ,没仔细研究，这里他们都是字符串

//解析JSON数据    public static List<Map<String,String>>resolveData(String jsonStr)    {        List<Map<String,String>>ls=new ArrayList<Map<String,String>>();        Map<String,String> data;        JSONObject jsonObject;        JSONArray jsonArr;        JSONArray nameArr;        try {            jsonArr=new JSONArray(jsonStr);            for(int i=0;i<jsonArr.length();i++)            {                jsonObject=jsonArr.getJSONObject(i);                nameArr=jsonObject.names();                data=new HashMap<String,String>();                String name;                for(int j=0;j<nameArr.length();j++)                {                    name=nameArr.getString(j);                    data.put(name, jsonObject.getString(name));                }                ls.add(data);                            }                    } catch (JSONException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return ls;            }

//php上面不管以任何方式得到一个数组，然后将数组编码成为json格式

//这里有一个方法可以将一整张表转换为数组

<?php //获取一张表的所有数据function getTabDatas($tabName,$link){if($tabName=="")    {        exit;    }    $sqlStr='SELECT * FROM '.$tabName;        $result = mysql_query($sqlStr, $link);    if (!$result) {        exit;        }       $fields= array();     for ($i=0; $i<mysql_num_fields($result); $i++)    {          $fields[] =mysql_field_name($result, $i);          }        $arr=array();    while ($row = mysql_fetch_assoc($result)) {    $once=array();            foreach ($fields as $value)        {           $once[$value]=$row[$value];                   }        $arr[]=$once;        }        mysql_free_result($result);        closeSqlconn();    return $arr;}?>

//然后php只需要将得到的数组格式化为json就行了

 $json_string = json_encode($resArr);echo $json_string;

//超时请求        httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 5000);        //读取超时        httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 5000);