通过Java HTTP连接将网络图片下载到本地

来源：互联网发布：网络计划图关键线路编辑：程序博客网时间：2024/06/06 05:41

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

* @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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