HttpURLConnection 下的網路請求

• 1.IsNet->網路判斷->HttpAsync中發起網路請求前使用
  2.HttpGetUtils->get請求工具類(發起請求獲取伺服器返回值)->
  HttpAsync->doinbackground->耗時聯網操作
  
  • 3.HttpAsync->非同步請求工具類->開啟子執行緒耗時操作->網路判斷;網路請求
  • 問題：HttpAsync獲取資料無法傳遞給Mainactivity？
  • 回撥方式解決
  • 4.NetCallBack->回撥介面->回撥資料
  • 5.MainActivity實現回撥介面->給Netcallback介面型別賦值
  • 6.MainActivity物件傳遞給HttpAsync->a.上下文;b.回撥介面物件
  • 7.httpAsync onPostExcute方法中使用回撥傳遞資料給Mainactivity
  • 8.MainActivity去resultstr處理字串操作;resultBitmap顯示圖片;erro提示使用者錯誤訊息
  • 9.AsyncContro控制產生HttpAsync物件以及呼叫excute方法開啟非同步類

網路判斷工具類

package com.sxt.day05_network;

import android.content.Context;
import android.net.ConnectivityManager;
import
 
 android.net.NetworkInfo;
import android.net.NetworkInfo.State;

/**
 * 網路判斷工具類
 * */

public class IsNet {

    private Context ctx;//上下文

    public IsNet(Context ctx){
        this.ctx = ctx;
    }

    //返回值為true有網，為false情況下無網
    public boolean IsNetWork(){
        //ConnectivityManager->手機連線管理器
        //getSystemService->獲取系統服務
 

        ConnectivityManager manager = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
        //網路狀態封裝類
        NetworkInfo info;
        //網路狀態
        State state;
        //TYPE_MOBILE->行動網路型別
        info = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        if(info !=null){
            state = info.getState();
            //判斷狀態是否連線
            if(state == State.CONNECTED){
                return true;
            }
        }
        info = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        if(info!=null){
            state = info.getState();
            if(state == State.CONNECTED){
                return true;
            }
        }
        return false;
    }

}

http—-post 請求

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * POST請求工具類
 * */
public class HttpPostUtils {

    //urlPath->請求地址
    //Params->請求引數
    public String PostStr(String urlPath,String Params){
        String result = null;
        try {
            URL url = new URL(urlPath);
            HttpURLConnection httpc = (HttpURLConnection) url.openConnection();
            httpc.setRequestMethod("POST");
            httpc.setConnectTimeout(60*1000);
            httpc.setReadTimeout(60*1000);
            httpc.setDoInput(true);
            httpc.setDoOutput(true);
            OutputStream out = httpc.getOutputStream();//獲取上傳引數的輸出流
            out.write(Params.getBytes());
            out.flush();
            out.close();
            if(httpc.getResponseCode() == 200){
                BufferedReader br = new BufferedReader(
                        new InputStreamReader(
                                httpc.getInputStream()));
                StringBuffer sb = new StringBuffer();
                String line;
                while((line = br.readLine())!=null){
                    sb.append(line);
                }
                br.close();
                result = sb.toString();
            }
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return result;
    }

}

Http—–get

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.util.Log;

public class HttpGetUtils {


    /**
     * Get方式請求伺服器資料方法
     * urlPath:完整請求url地址
     * result:伺服器響應資料
     * */
    public String getStr(String urlPath){
        String result = null;
        try {
            Log.e("","檢視請求地址是否錯誤"+urlPath);
            //URL->伺服器地址封裝開啟urlconnection(請求配置，發起請求，獲取相應狀態，獲取返回流)
            URL url = new URL(urlPath);
            HttpURLConnection httpc = (HttpURLConnection) url.openConnection();
            //請求方式設定
            httpc.setRequestMethod("GET");
            //連線超時
            httpc.setConnectTimeout(60*1000);
            //讀取超時
            httpc.setReadTimeout(60*1000);
            //允許讀入
            httpc.setDoInput(true);
            //獲取響應狀態碼->獲取響應狀態時傳送請求->200 請求成功
            if(httpc.getResponseCode() == 200){
                //伺服器資料讀取到應用中
                //伺服器返回流轉化為字元流              
                BufferedReader br = new BufferedReader(
                        new InputStreamReader(
                                httpc.getInputStream()));
                StringBuffer sb = new StringBuffer();
                String line;
                while((line = br.readLine()) != null){
                    sb.append(line);
                }
                br.close();
                result = sb.toString();
                Log.e("","檢視返回值"+result);
            }
        } catch (MalformedURLException e) {
            //url生成異常
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

}

Http—–下載圖片

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

/**
 * 獲取伺服器圖片工具類
 * */
public class HttpBitmapUtils {

    public Bitmap downBitmap(String urlPath){
        Bitmap bitmap = null;
        try {
            URL url = new URL(urlPath);
            HttpURLConnection httpc = (HttpURLConnection) url.openConnection();
            httpc.setConnectTimeout(60*1000);
            httpc.setReadTimeout(60*1000);
            if(httpc.getResponseCode() == 200){
                InputStream in = httpc.getInputStream();
                //BitmapFactory->不同方式讀取圖片進入程式中
                bitmap = BitmapFactory.decodeStream(in);
            }
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return bitmap;
    }

}

最後附上實現的效果