参考资料：
http://www.open-open.com/lib/view/open1326376799874.html
http://www.cnblogs.com/tt_mc/archive/2011/01/04/1925327.html
总结:
解析普通json：使用JSONObject，getString方法；
解析数组形式json：使用JSONArray，getJSONArray方法后，遍历数组，使用普通json的解析方法；
public class GetPostMain extends Activity
{
Button get , post;
EditText show;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
get = (Button) findViewById(R.id.get);
post = (Button) findViewById(R.id.post);
show = (EditText)findViewById(R.id.show);
get.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
String response = GetPostUtil
.sendGet("http://www.weather.com.cn/data/sk/101281601.html" , null);
show.setText(response); }
});
post.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
String data = "";
try{
// 构造json
JSONObject param = new JSONObject();
param.put("userid", "uid45798");
param.put("lat", "32.038587000000");
param.put("lon", "118.778906000000");
data = param.toString();
}catch(JSONException e){
Log.e("postdata", "Json post error");
}
String response = GetPostUtil.sendPost("http://xxxx.getNearbyActivity", data);
Log.d("postdata",data); String str1 = "";
String str2 = "";
try{
// 获取单个key值
JSONObject jsonObj = new JSONObject(response.toString());
String errorcode = "errorcode:" + jsonObj.getString("errorcode");
String count = "count:" + jsonObj.getString("count");
String userid = "userid:" + jsonObj.getString("userid");
str1 = errorcode+"\n"+userid+"\n"+count+"\n";
}catch(JSONException e){
System.out.println("Json parse error");
str1 = "str1没有数据\n";
} try{
// 获取多组json
JSONArray jsonObjs = new JSONObject(response.toString()).getJSONArray("datalist");
for(int i = 0; i < jsonObjs.length() ; i++){
JSONObject jsonObj = (JSONObject)jsonObjs.opt(i);
String brand = "brand:"+ jsonObj.getString("brand");
String aid = "aid:"+ jsonObj.getString("aid");
str2 += aid+","+brand+"\n";
}
}catch(JSONException e){
System.out.println("Json parse error");
str2 = "str2没有数据";
}
show.setText(str1+str2);
}
});
}
}