Android网络开发中GET与POST请求详解

public class NetUtil{
	public static String BASE_URL="https://v0.yiketianqi.com/free/day";
	public static String APP_ID="14846972";
	public static String APP_SECRET="Guya4Gz2";
	public static String doGet(String url){ 
		BufferedReader reader = null;
		String bookHSONString = null;
		try{
			//1.HttpURLConnection建立连接
			HttpURLConnection httpURLConnection = null;
			URL requestUrl = new URL(url);
			httpURLConnection = (HttpURLConnection)requestUrl.openconnection();//打开连接
			httpURLConnection.setRequestMethod("GET");//两种方法GET/POST
			httpURLConnection.setConnectionTimeout(5000);//设置超时连接时间
			httpURLConnection.connect();
			//2.InputStream获取二进制流
			InputStream inputstream = httpURLConnection.getInputStream();
			//3.InputStreamReader将二进制流进行包装成BufferedReader
			reader = new BufferedReader(new InputStreamReader(inputStream));
			//4.从BufferedReader中读取String字符串,用StringBulider接收
			StringBulider bulider = new StringBulider();
			String line;
			while((line=reader.readLine())!=null){
				bulider.append(line);
				bulider.append("\n");
				}
			if(bulider.length()==0)
			{
				return null;
			}
			//5.StringBulider将字符串进行拼接
			bookJSONString = bulider.toString();
			}catch(MalformedURLException e){
			e.printStackTrace();
			}finally {
            // 关闭连接
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
		return bookJSONString;
		}
	public static String getWeatherOfCity(String city){
		//拼接处get请求的url
		String weatherUrl = BASE_URL+"?"+"appid="+APP_ID+"&"+"appsecret="+APP_SECRET+"&"+"city="+city;
		//打印上面的url
		Log.d("fan","-----weatherUrl----"+weatherUrl);
		//调用上文所写的doGet方法，传参
		String weatherResult = doGet(weatherUrl);
		return decodeUnicode(weatherResult);
	}
	//解码Unicode，将其转化为我们认识的汉字
	public static String decodeUnicode(String unicodeStr) {
        if (unicodeStr == null) {
            return null;
        }
        StringBuffer retBuf = new StringBuffer();
        int maxLoop = unicodeStr.length();
        for (int i = 0; i < maxLoop; i++) {
            if (unicodeStr.charAt(i) == '\\') {
                if ((i < maxLoop - 5) && ((unicodeStr.charAt(i + 1) == 'u') || (unicodeStr.charAt(i + 1) == 'U')))
                    try {
                        retBuf.append((char) Integer.parseInt(unicodeStr.substring(i + 2, i + 6), 16));
                        i += 5;
                    } catch (NumberFormatException localNumberFormatException) {
                        retBuf.append(unicodeStr.charAt(i));
                    }
                else
                    retBuf.append(unicodeStr.charAt(i));
            } else {
                retBuf.append(unicodeStr.charAt(i));
            }
        }
        return retBuf.toString();
    }
}

public class MainActivity extends AppCompatActivity{
	private TextView tvContent;
	//此处写一个handler程序
	private Handler mHandler = new Handler(Looper.myLooper()){
		@Override
		public void handleMessage(@NonNull Message msg){
		super.handlerMessage(msg);
		if(msg.what==0){
			String strData = (String)msg.obj;
			tvContent.setText(strData);
			Toast.makeText(MainActivity.this,"主线程收到网络消息啦！",Toast.LENGTH_SHORT).show();
			}
		}
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvContent = findViewById(R.id.tv_content);
    }
    public void start(View view){
    	//做一个耗时任务
    	new Thread(new Runnable(){
    		@Override
    		public void run(){
    			String stringFormNet = getStringFormNet();
    			//使用handler来发送消息
				Message message = new Message();
				message.what = 0;//用于区分是谁发的消息
    			message.obj = stringFormNet;
    			mHandler.sendMessage(meaasge);
    			}
    		}).start();
    		Toast.makeText(MainActivity.this,"开启子线程请求网络！",Toast.LENGTH_SHORT).show();
    		}
    private String getStringFormNet(){
		//从网络上获取字符串
		return NetUtil.getWeatherofCity("深圳");
	}
}