Android(安卓)HTTP请求

Android HTTP请求

直接上代码：
代码中有GET和POST两种方法：
package com.example.camera.demohttp;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.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;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private HandlerThread handlerThread;    private Handler handler;    private ImageView imageView;    private final int DOWNDLOAD = 1;    private final int REGISTER = 2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        findViewById(R.id.downloadFile).setOnClickListener(this);        findViewById(R.id.register).setOnClickListener(this);        imageView = findViewById(R.id.img);        handlerThread = new HandlerThread("http");        handlerThread.start();        handler = new HttpHandler(handlerThread.getLooper());//让handler消息运行子线程    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.downloadFile:                handler.sendEmptyMessage(DOWNDLOAD);                break;            case R.id.register:                handler.sendEmptyMessage(REGISTER);                break;                default:                    break;        }    }    private class HttpHandler extends Handler {        public HttpHandler(Looper looper) {            super(looper);        }        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case DOWNDLOAD:                    downloadFile();                    break;                case REGISTER:                    registerUser();                    break;                    default:                        break;            }        }    }    //post请求    private void registerUser() {        String registerUrl = "http://169.254.230.253:8080/register";        try {            URL url = new URL(registerUrl);            HttpURLConnection postConnection = (HttpURLConnection) url.openConnection();            postConnection.setRequestMethod("POST");//post 请求            postConnection.setConnectTimeout(1000*5);            postConnection.setReadTimeout(1000*5);            postConnection.setDoInput(true);//允许从服务端读取数据            postConnection.setDoOutput(true);//允许写入            postConnection.setRequestProperty("Content-type", "application/x-www-form-urlencoded");//以表单形式传递参数            String postParms = "name=1702C2019&password=12345&verifyCode=8888";            OutputStream outputStream = postConnection.getOutputStream();            outputStream.write(postParms.getBytes());//把参数发送过去.            outputStream.flush();            final StringBuffer buffer = new StringBuffer();            int code = postConnection.getResponseCode();            if (code == 200) {//成功                InputStream inputStream = postConnection.getInputStream();                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));                String line = null;//一行一行的读取                while ((line = bufferedReader.readLine()) != null) {                    buffer.append(line);//把一行数据拼接到buffer里                }                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        //把从服务端获取的数据提示出来                        Toast.makeText(MainActivity.this, buffer.toString(), Toast.LENGTH_SHORT).show();                    }                });            }        } catch (Exception e) {            e.printStackTrace();        }    }    //需要放到子线程中去,使用handlerThread.    private void downloadFile() {        String downloadUrl = "http://pic41.nipic.com/20140508/18609517_112216473140_2.jpg";        String savePath = "/sdcard/flowergirl.jpg";        File file = new File(savePath);        if (file.exists()) {            file.delete();//如果文件存在，先删掉        }        BufferedInputStream bufferedInputStream = null;        FileOutputStream outputStream = null;        try {            URL url = new URL(downloadUrl);            try {                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();                httpURLConnection.setRequestMethod("GET");                httpURLConnection.setConnectTimeout(1000*5);                httpURLConnection.setReadTimeout(1000*5);                httpURLConnection.setDoInput(true);                httpURLConnection.connect();                //代表请求成功                if (httpURLConnection.getResponseCode() == 200) {                    InputStream in = httpURLConnection.getInputStream();                    bufferedInputStream = new BufferedInputStream(in);//文件输入流                    outputStream = new FileOutputStream(savePath);                    byte[] buffer = new byte[1024];                    int length = 0;                    while ((length = bufferedInputStream.read(buffer)) != -1) {                        outputStream.write(buffer, 0, length);//写入文件                    }                    outputStream.flush();//强制把数据写入磁盘                    final Bitmap bitmap = BitmapFactory.decodeFile(savePath);                    runOnUiThread(new Runnable() {                        @Override                        public void run() {                            imageView.setImageBitmap(bitmap);                        }                    });                }            } catch (IOException e) {                e.printStackTrace();            }        } catch (MalformedURLException e) {            e.printStackTrace();        } finally {            try {                if (bufferedInputStream!= null) {                    bufferedInputStream.close();                }                if (outputStream != null) {                    outputStream.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }    }}
Android HTTP请求

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