Question

Android网络操作的几种方法

Answer 1

第一种方式：使用HttpURLConnection进行联网操作

这个方法需要我们手动构建一个http请求包，发送到指定的服务器

get方式

• 设置URL

• 打开连接

• 设置请求方法为get

• 设置连接超时时间

• 设置读取超时时间

• 把当前的request发送到服务器端

• 等待服务器的响应（此处会阻塞）

• 获得响应码（并在响应码中做相应的操作），因为安卓子线程内不允许做UI更新的操作，所以需要转到主线程来做（通过安卓中的handler来将信息传递到主线程）

• public void getPic(View v){
          new Thread(new Runnable() {
              @Override
              public void run() {
                  try {
                      //首先要支出服务器的地址
                      URL url=new URL("http://192.168.2.1/day10_NetworkServer/brushli.jpg");
                      //通过http连接
                      HttpURLConnection httpurlConnection = (HttpURLConnection) url.openConnection();
                      //设置请求方式,并设置等待响应时间
                      httpurlConnection.setRequestMethod("GET");
                      httpurlConnection.setConnectTimeout(5000);
                      //把当前的request发送到服务器(安卓不允许在主线程内做耗时操作，如连接服务器)
                      httpurlConnection.connect();
                      //发送完连接后等待操作,这个是阻塞式方法，
                      int responseCode = httpurlConnection.getResponseCode();
  
                      //根据得到的响应代码和response的信息作出相应的操作
                      if(responseCode==200){
                          //从服务器读取正确与否的信息
                          InputStream is=httpurlConnection.getInputStream();
                          File file=new File("/data/data/com.rgd.day10_network_3/files");
                          file.mkdir();
                          FileOutputStream fos=new FileOutputStream(new File("/data/data/com.rgd.day10_network_3/files/brushli.jpg"));
                          byte[] buffer=new byte[1024];
                          int read;
                          while ((read =is.read(buffer))!=-1){
                              fos.write(buffer,0,read);
                          }
                          //由于子线程不允许做UI更新操作，与要通过Handler进行和主线程的通信操作
  
                          Message msg=new Message();
                          msg.what=1;
                          handler.sendMessage(msg);
                          fos.close();
                          is.close();
  
                      }
                  } catch (MalformedURLException e) {
                      e.printStackTrace();
                  } catch (IOException e) {
                      e.printStackTrace();
                  }
  
              }
          }).start();
  
      }
  Handler handler=new Handler(){
          @Override
          public void handleMessage(Message msg) {
              super.handleMessage(msg);
              switch(msg.what){
                  case 1:
                      Toast.makeText(MainActivity.this, "保存图片成功", Toast.LENGTH_LONG).show();
                      break;
                  case 2:
                      Toast.makeText(MainActivity.this,"保存MP3成功",Toast.LENGTH_LONG).show();
                      break;
                  case 3:
                      Toast.makeText(MainActivity.this,"保存视频成功",Toast.LENGTH_SHORT).show();
                  default:
                      break;
              }
          }
      };

2.post方式

• 操作跟get差不多，除了post传递信息是通过正文传递的，而get是放在连接中的

• new Thread(new Runnable() {
                  @Override
                  public void run() {
                      try {
                          //首先要支出服务器的地址
                          URL url=new URL("http://192.168.106.1/day10_NetworkServer/servlet/loginInfo");
                          //通过http连接
                          HttpURLConnection httpurlConnection = (HttpURLConnection) url.openConnection();
                          //设置请求方式,并设置等待响应时间
                          httpurlConnection.setRequestMethod("POST");
                          httpurlConnection.setConnectTimeout(5000);
  
                          String data="username="+username+"&password="+password+"&email="+email+"&phonenumber="+phonenumber;
                          OutputStream outputStream = httpurlConnection.getOutputStream();
                          outputStream.write(data.getBytes());
                          //把当前的request发送到服务器(安卓不允许在主线程内做耗时操作，如连接服务器)
                          httpurlConnection.connect();
                          //发送完连接后等待操作,这个是阻塞式方法，
                          int responseCode = httpurlConnection.getResponseCode();
  
                          //根据得到的响应代码和response的信息作出相应的操作
                          if(responseCode==200){
                              //从服务器读取正确与否的信息
                              InputStream is=httpurlConnection.getInputStream();
                              byte[] buffer=new byte[1024];
                              int read = is.read(buffer);
                              String result=new String(buffer,0,read);
                              //由于子线程不允许做UI更新操作，与要通过Handler进行和主线程的通信操作
                              Message msg=new Message();
                              msg.what=1;
                              handler.sendMessage(msg);
  
                          }else{
                              Message msg=new Message();
                              msg.what=-1;
                              handler.sendMessage(msg);
                          }
                      } catch (MalformedURLException e) {
                          e.printStackTrace();
                      } catch (IOException e) {
                          e.printStackTrace();
                      }
  
                  }
              }).start();

Answer 2

基本上就是get,post
或者直接ftp上传数据