网络开发-获得图片

1：工具类

package cn.itcast.utils;

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

public class StreamTool {

	/**
	 * 从输入流中获取数据
	 * @param inStream 输入流
	 * @return
	 * @throws Exception
	 */
	public static byte[] readInputStream(InputStream inStream) throws Exception{
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = 0;
		while( (len=inStream.read(buffer)) != -1 ){
			outStream.write(buffer, 0, len);
		}
		inStream.close();
		return outStream.toByteArray();
	}
}

 

 

2：业务类

package cn.itcast.service;

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

import cn.itcast.utils.StreamTool;

public class ImageService {
 
 public static byte[] getImage(String path) throws Exception {
  URL url = new URL("http://i3.itc.cn/20100707/76c_0969b700_d5b4_41cd_8243_9b486be92cc4_0.jpg");
  HttpURLConnection conn = (HttpURLConnection)url.openConnection();
  conn.setRequestMethod("GET");
  conn.setConnectTimeout(5 * 1000);
  InputStream inStream = conn.getInputStream();//通过输入流获取图片数据
  return StreamTool.readInputStream(inStream);//得到图片的二进制数据
 }

}

 

3：activate

package cn.itcast.image;

import cn.itcast.service.ImageService;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class ImageShowActivity extends Activity {
	private static final String TAG = "ImageShowActivity";
    private EditText pathText;
    private ImageView imageView;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        pathText = (EditText) this.findViewById(R.id.urlpath);
        imageView = (ImageView) this.findViewById(R.id.imageView);
        Button button = (Button)this.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				String path = pathText.getText().toString();
				try {
					byte[] data = ImageService.getImage(path);
					Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);//生成位图
					imageView.setImageBitmap(bitmap);//显示图片					
				} catch (Exception e) {
					Toast.makeText(ImageShowActivity.this, R.string.error, 1).show();
					Log.e(TAG, e.toString());
				}
			}
		});
    }
}