資源圖片下載

package imageView;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
/**
 * @說明 從網絡獲取圖片到本地
 * @author …………
 * @version 1.0
 * @since
 */
public class GetImage {
    /**
     * 測試
     * @param args
     */
    public static void main(String[] args) {
        String url = "http://www.baidu.com/img/baidu_sylogo1.gif";
        byte[] btImg = getImageFromNetByUrl(url);
        if(null != btImg && btImg.length > 0){
            System.out.println("讀取到：" + btImg.length + " 字節");
            String fileName = "百度.gif";
            writeImageToDisk(btImg, fileName);
        }else{
            System.out.println("沒有從該連接獲得內容");
        }
    }
    /**
     * 將圖片寫入到磁盤
     * @param img 圖片數據流
     * @param fileName 文件保存時的名稱
     */
    public static void writeImageToDisk(byte[] img, String fileName){
        try {
            File file = new File("D:\\" + fileName);
            FileOutputStream fops = new FileOutputStream(file);
            fops.write(img);
            fops.flush();
            fops.close();
            System.out.println("圖片已經寫入到D盤");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    /**
     * 根據地址獲得數據的字節流
     * @param strUrl 網絡連接地址
     * @return
     */
    public static byte[] getImageFromNetByUrl(String strUrl){
        try {
            URL url = new URL(strUrl);
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5 * 1000);
            InputStream inStream = conn.getInputStream();//通過輸入流獲取圖片數據
            byte[] btImg = readInputStream(inStream);//得到圖片的二進制數據
            return btImg;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 從輸入流中獲取數據
     * @param inStream 輸入流
     * @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();
    }
}