Android使用HttpURLConnection进行POST请求，向服务器上传数据

先在清单文件中需要添加权限：

<uses-permission android:name="android.permission.INTERNET"/>

开始使用HttpURLConnection进行POST请求，向服务器上传数据：
（1）定位到要获取资源的网址并打开连接：

URL url = new URL(String urlPath);HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

（2）进行连接设置：

//设置连接超时,2000mshttpURLConnection.setConnectTimeout(2000);//设置指定时间内服务器没有返回数据的超时，5000mshttpURLConnection.setReadTimeout(5000);//设置允许输出httpURLConnection.setDoOutput(true);//设置请求的方式httpURLConnection.setRequestMethod("POST");

（3）将要传送的数据写入输出流：

PrintWriter out = new PrintWriter(httpURLConnection.getOutputStream());out.print(timeTag);//写入输出流out.flush();//立即刷新out.close();

（4）对响应码进行判断，并获取网络返回的输入流：

int code = httpURLConnection.getResponseCode();if(code == 200){     InputStream is = httpURLConnection.getInputStream();     //连接服务器后，服务器做出响应返回的数据     String serverResponse = URLDecoder.decode(readInStream(is), "utf-8");     is.close();    //对返回的数据serverResponse进行操作}

（5）关闭连接：

httpURLConnection.disconnect();

一个向服务器上传Json数据包的例子：

    /**     * 将Json对象上传服务器     * @param url     * @param jsonObject     * @throws JSONException     */    private void postJsonToServer(URL url, JSONObject jsonObject ) throws JSONException {        //把JSON数据转换成String类型使用输出流向服务器写        try {            String str = "user="+ URLEncoder.encode(URLEncoder.encode(String.valueOf(jsonObject), "UTF-8"),"UTF-8");        try {            HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();            httpURLConnection.setConnectTimeout(2000);            httpURLConnection.setReadTimeout(5000);            httpURLConnection.setDoOutput(true);//设置允许输出            httpURLConnection.setRequestMethod("POST");//设置请求的方式            httpURLConnection.setRequestProperty("ser-Agent", "Fiddler");            //把上面访问方式改为异步操作,就不会出现 android.os.NetworkOnMainThreadException异常            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();            StrictMode.setThreadPolicy(policy);            PrintWriter out = new PrintWriter(httpURLConnection.getOutputStream());            out.print(str);//写入输出流            out.flush();//立即刷新            out.close();            int code = httpURLConnection.getResponseCode();            if(code == 200 && ((url.toString()).equals(httpURLConnection.getURL().toString()))){                //获取服务器响应后返回的数据                InputStream is = httpURLConnection.getInputStream();                String successResponse = URLDecoder.decode(readInStream(is), "utf-8");                is.close();              if(SUCCESS_RESPONSE.equals(successResponse)){                    //上传成功                }            } else{                //上传失败            }        }catch (ConnectException e){            e.printStackTrace();        }        catch (SocketTimeoutException e){            e.printStackTrace();        catch (IOException e) {            e.printStackTrace();        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }    }

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