HttpUrlConnection 下的post, get , 和图片下载（工具类）

HttpURLConnection 下的网络请求

• 1.IsNet->网络判断->HttpAsync中发起网络请求前使用
  2.HttpGetUtils->get请求工具类(发起请求获取服务器返回值)->
  HttpAsync->doinbackground->耗时联网操作
  
  • 3.HttpAsync->异步请求工具类->开启子线程耗时操作->网络判断;网络请求
  • 问题：HttpAsync获取数据无法传递给Mainactivity？
  • 回调方式解决
  • 4.NetCallBack->回调接口->回调数据
  • 5.MainActivity实现回调接口->给Netcallback接口类型赋值
  • 6.MainActivity对象传递给HttpAsync->a.上下文;b.回调接口对象
  • 7.httpAsync onPostExcute方法中使用回调传递数据给Mainactivity
  • 8.MainActivity去resultstr处理字符串操作;resultBitmap显示图片;erro提示用户错误消息
  • 9.AsyncContro控制产生HttpAsync对象以及调用excute方法开启异步类

网络判断工具类

package com.sxt.day05_network;import android.content.Context;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.net.NetworkInfo.State;/** * 网络判断工具类 * */public class IsNet {    private Context ctx;//上下文    public IsNet(Context ctx){        this.ctx = ctx;    }    //返回值为true有网，为false情况下无网    public boolean IsNetWork(){        //ConnectivityManager->手机连接管理器        //getSystemService->获取系统服务        ConnectivityManager manager = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);        //网络状态封装类        NetworkInfo info;        //网络状态        State state;        //TYPE_MOBILE->移动网络类型        info = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);        if(info !=null){            state = info.getState();            //判断状态是否连接            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 请求

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请求工具类 * */public class HttpPostUtils {    //urlPath->请求地址    //Params->请求参数    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();//获取上传参数的输出流            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方式请求服务器数据方法     * urlPath:完整请求url地址     * result:服务器响应数据     * */    public String getStr(String urlPath){        String result = null;        try {            Log.e("","查看请求地址是否错误"+urlPath);            //URL->服务器地址封装打开urlconnection(请求配置，发起请求，获取相应状态，获取返回流)            URL url = new URL(urlPath);            HttpURLConnection httpc = (HttpURLConnection) url.openConnection();            //请求方式设定            httpc.setRequestMethod("GET");            //连接超时            httpc.setConnectTimeout(60*1000);            //读取超时            httpc.setReadTimeout(60*1000);            //允许读入            httpc.setDoInput(true);            //获取响应状态码->获取响应状态时发送请求->200 请求成功            if(httpc.getResponseCode() == 200){                //服务器数据读取到应用中                //服务器返回流转化为字符流                              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("","查看返回值"+result);            }        } catch (MalformedURLException e) {            //url生成异常            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return result;    }}

Http—–下载图片

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;/** * 获取服务器图片工具类 * */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->不同方式读取图片进入程序中                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;    }}

最后附上实现的效果

demo源码