Java HTTP连接将网络图片下载到本地

来源：互联网发布：晶科能源有限公司知乎编辑：程序博客网时间：2024/05/12 09:50

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;
/**
* @说明从网络获取图片到本地
* @author 崔素强
* @version 1.0
* @since
*/
public class GetImage {
   /**
   * 测试
   * @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("读取到：" + btImg.length + " 字节");
           String fileName = "百度.gif";
           writeImageToDisk(btImg, fileName);
       }else{
           System.out.println("没有从该连接获得内容");
       }
   }
   /**
   * 将图片写入到磁盘
   * @param img 图片数据流
   * @param fileName 文件保存时的名称
   */
   public static void writeImageToDisk(byte[] img, String fileName){
       try {
           File file = new File("C:\\" + fileName);
           FileOutputStream fops = new FileOutputStream(file);
           fops.write(img);
           fops.flush();
           fops.close();
           System.out.println("图片已经写入到C盘");
       } catch (Exception e) {
           e.printStackTrace();
       }
   }
   /**
   * 根据地址获得数据的字节流
   * @param strUrl 网络连接地址
   * @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();//通过输入流获取图片数据
           byte[] btImg = readInputStream(inStream);//得到图片的二进制数据
           return btImg;
       } catch (Exception e) {
           e.printStackTrace();
       }
       return null;
   }
   /**
   * 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();
   }
}

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