HttpClient client = new HttpClient();

PostMethod post = new PostMethod("your url");

//準備引數,可以是多個

NameValuePair simcard = new NameValuePair("key","value");

post.setRequestBody(new NameValuePair[]{simcard});

//執行請求

client.executeMethod(method);

//獲取返回值

String response = new String(method.getResponseBodyAsString().getBytes("iso-8859-1"));

//把json字串轉換為物件,有很多方法

SONObject result = new JSONObject(response);