使用HttpConnection

1.URL：包含請求地址的類

url(path):包含請求路徑的構造方法

openConnection():得到連線物件

2.HttpURLConnection：代表與伺服器連線的類

setMethod("GET/POST"):設定請求方式

setConnectionTimeout(time):設定連線超時時間，單位為ms

setReadTimeout(time):設定讀取伺服器返回資料的時間

connect():連線伺服器

int getResponseCode():得到伺服器返回的結果嗎

int getContentLength():得到伺服器返回資料的長度（位元組）

getOutputStream():返回一個指向伺服器端的資料輸出流

getInputStream():返回一個從伺服器端返回的資料輸入流

disconnect():斷開連線

//顯示ProgressDialog
                final ProgressDialog dialog = ProgressDialog.show(netActivity.this,null,"正在請求中...");
                //啟動分執行緒
                new Thread() {
                    @Override
                    public void run() {
                        //在分執行緒，傳送請求，得到響應資料
                        try {
                            //得到path
                            String path = et_net_url.getText().toString()+"?name=Tom&age=12";
                            //建立URL物件
                            URL url = new URL(path);
                            //開啟連線，得到HttpURLConnection物件
                            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//                            設定請求方式，連線超時，讀取資料超時
                            connection.setRequestMethod("GET");
                            connection.setConnectTimeout(5000);
                            connection.setReadTimeout(6000);
                            //連結伺服器
                            connection.connect();
                            //傳送請求，得到響應資料
                            int responseCode = connection.getResponseCode();
                            //必須是200才讀
                            if (responseCode==200) {
                                //得到InputStream，讀取成string
                                InputStream is = connection.getInputStream();
                                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                                byte [] buffer = new byte[2014];
                                int len =-1;
                                while ((len=is.read(buffer))!=-1) {
                                    baos.write(buffer,0,len);
                                }
                                final String result = baos.toString();

                                baos.close();
                                is.close();
                                runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        et_net_show.setText(result);
                                        dialog.dismiss();
                                    }
                                });
                            }

                            connection.disconnect();
                        } catch (Exception e) {
                            e.printStackTrace();
                            dialog.dismiss();
                        }
                    }
                }.start();
 

post請求

 //顯示ProgressDialog
                final ProgressDialog dialog = ProgressDialog.show(netActivity.this, null, "正在載入中....");
                //啟動分執行緒
                new Thread(){
                    public void run() {
                        try {
                            String path = et_net_url.getText().toString(); //得到path
                            URL url = new URL(path);//建立URL物件
                            HttpURLConnection connection = (HttpURLConnection) url.openConnection();//開啟連結，得到HttpURLConnection連線物件
                            connection.setRequestMethod("POST");//設定請求方式
                            connection.setConnectTimeout(5000);//設定連線時間
                            connection.setReadTimeout(5000);//設定讀取時間
                            connection.connect();//開啟連結
                            //發請求，得到響應資料
                            //得到輸出流，寫請求體：name=Tom&age=21
                            OutputStream os = connection.getOutputStream();
                            String data = "name=哈哈&age=21";
                            os.write(data.getBytes("utf-8"));
                            int responseCode = connection.getResponseCode();
                            if (responseCode==200) {
                                InputStream is = connection.getInputStream();
                                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                                byte[] buffer = new byte[2014];
                                int len=-1;
                                while ((len=is.read(buffer))!=-1) {
                                    baos.write(buffer,0,len);
                                }
                                final String result = baos.toString();
                                baos.close();
                                is.close();
                                runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        et_net_show.setText(result);
                                        dialog.dismiss();
                                    }
                                });
                                connection.disconnect();

                            }
                            os.close();
                        } catch (Exception e) {
                            e.printStackTrace();
                            dialog.dismiss();
                        }

                    }

                } .start();