URLToByte 类

package util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class URLToByte {

    public static byte[] getImageFromURL(String urlPath) {
        byte[] data = null;
        InputStream is = null;
        HttpURLConnection conn = null;
        try {
            URL url = new URL(urlPath);
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true);
            // conn.setDoOutput(true);
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(6000);
            is = conn.getInputStream();
            if (conn.getResponseCode() == 200) {
                data = readInputStream(is);
            }
            else{
                data=null;
            }
        }
        catch (MalformedURLException e) {
            e.printStackTrace();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        finally {
            try {
                if(is != null){
                    is.close();
                }
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            conn.disconnect();
        }
        return data;
    }

    /**
     * 读取InputStream数据，转为byte[]数据类型
     * @param is
     * InputStream数据
     * @return 返回byte[]数据
     */

    public static byte[] readInputStream(InputStream is) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int length = -1;
        try {
            while ((length = is.read(buffer)) != -1) {
                baos.write(buffer, 0, length);
            }
            baos.flush();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        byte[] data = baos.toByteArray();
        try {
            is.close();
            baos.close();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        return data;
    }
}