Post和get请求

一、效果

二、代码示例

package com.bw.day13;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import day01.bw.com.myapplication.R;

public class Main12Activity extends AppCompatActivity {

    public static final int DOWNLOAD = 1;
    public static final int REGISTER = 2;

    ImageView showImg;
    Button download;
    Button postRequest;
    HandlerThread handlerThread;
    Handler handler;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main12);
        download = findViewById(R.id.download);
        showImg = findViewById(R.id.showImg);
        postRequest= findViewById(R.id.postRequest);
        handlerThread = new HandlerThread("http");
        handlerThread.start();
        handler = new HttpHandler(handlerThread.getLooper());//让handler消息运行在子线程

        download.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handler.sendEmptyMessage(DOWNLOAD);
            }
        });
        postRequest.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handler.sendEmptyMessage(REGISTER);
            }
        });
    }

    //get请求方法
    private void downFile() {
        BufferedInputStream bis=null;
        FileOutputStream fos=null;
        String url = "http://pic41.nipic.com/20140508/18609517_112216473140_2.jpg";
        String save = "/sdcard/flowergirl.jpg";
        File file = new File(save);
        if(file.exists()){
            file.delete();
        }
        try {
            URL url1 = new URL(url);
            HttpURLConnection urlconn = (HttpURLConnection) url1.openConnection();
            urlconn.setRequestMethod("GET");
            urlconn.setConnectTimeout(1000*5);
            urlconn.setReadTimeout(1000*5);
            urlconn.setDoInput(true);
            urlconn.connect();
            if(urlconn.getResponseCode() == 200){
                InputStream is = urlconn.getInputStream();
                bis = new BufferedInputStream(is);
                fos = new FileOutputStream(save);
                byte[] bytes = new byte[1024];
                int len =-1;
                while((len=bis.read(bytes)) !=-1){
                    fos.write(bytes,0,len);
                }
                fos.flush();
            }
            final Bitmap bitmap = BitmapFactory.decodeFile(save);
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    showImg.setImageBitmap(bitmap);
                }
            });


        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if(bis!=null){
                    bis.close();
                }
                if(fos!=null){
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    //Post请求方法
    private void registerPost() {
            String registerUrl = "http://169.254.230.253:8080/register";
            try {
                URL url1 = new URL(registerUrl);
                HttpURLConnection urlconn = (HttpURLConnection) url1.openConnection();
                urlconn.setRequestMethod("POST");
                urlconn.setConnectTimeout(1000*5);
                urlconn.setReadTimeout(1000*5);
                urlconn.setDoInput(true);
                urlconn.setDoOutput(true);
                urlconn.setRequestProperty("Content-type","application/x-www-form-urlencoded");
                String postParam = "name=1702ccc&password=12345";
                OutputStream os = urlconn.getOutputStream();
                os.write(postParam.getBytes());//把参数发送过去
                os.flush();
                final StringBuilder sb = new StringBuilder();
                int code = urlconn.getResponseCode();
                if(code == 200){
                     InputStream is = urlconn.getInputStream();
                     BufferedReader br = new BufferedReader(new InputStreamReader(is));
                     String line = null;
                     while((line = br.readLine()) != null){
                         sb.append(line);
                     }
                }
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(Main12Activity.this, sb.toString(), Toast.LENGTH_SHORT).show();
                    }
                });



            }catch (Exception e){
                e.printStackTrace();
            }
    }

    private class HttpHandler extends Handler{
        public HttpHandler(Looper looper){
            super(looper);
        }
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case DOWNLOAD:
                    downFile();
                    break;
                case REGISTER:
                    registerPost();
                    break;
                    default:
                        break;
            }
        }


    }
}