23_网络通信之网络图片查看器

《string》

    <string name="error">error</string>
    <string name="default_url">"http://172.17.21.231:8080/web/gg.jpg"</string>

《manife》

　　<uses-permission android:name="android.permission.INTERNET"/>

《StreamTool.java》

package cn.itcast.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamTool {

    /**
     * 读取流中的数据
     * @param inStream
     * @return
     */
    public static byte[] read(InputStream inStream) {
        // TODO Auto-generated method stub
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        try {
            while ( -1!=(len=inStream.read(buffer)) )
            {
                outStream.write(buffer, 0, len);
            }
            inStream.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return outStream.toByteArray();
    }

}

《》

package cn.itcast.service;

import java.io.InputStream;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

import cn.itcast.utils.StreamTool;

public class ImageService {

    /**
     * 获取网络图片数据
     * @param path    网络图片URL
     * @return
     */
    public static byte[] getImage(String path) throws Exception{
        // TODO Auto-generated method stub
        URL url = new URL(path);
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setConnectTimeout(5000);
        conn.setRequestMethod("GET");
        if (conn.getResponseCode()==200){
            InputStream inStream =  conn.getInputStream();
            byte[] res = StreamTool.read(inStream);
        }
        
        
        return null;
    }

}

<MainActivity.java>

    private class ButtonClickListenner implements View.OnClickListener{
        public void onClick(View v) {
            String path = pathText.getText().toString();
            
            try {
                byte[] data = ImageService.getImage(path);
                Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
                imageView.setImageBitmap(bitmap);
                
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), R.string.error, 1).show();
            }
            

        }