Java读取并下载网络文件的方法

本文实例为大家分享了Java读取并下载网络文件的具体代码，供大家参考，具体内容如下

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;


public class DownloadFromNetwork {
   
  public static void downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException{ 
    URL url = new URL(urlStr);  
    HttpURLConnection conn = (HttpURLConnection)url.openConnection();  
 //设置超时间为3秒 
    conn.setConnectTimeout(3*1000); 
    //防止屏蔽程序抓取而返回403错误 
    conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"); 
 
    //得到输入流 
    InputStream inputStream = conn.getInputStream();  
    //获取自己数组 
    byte[] getData = readInputStream(inputStream);   
 
    //文件保存位置 
    File saveDir = new File(savePath); 
    if(!saveDir.exists()){ 
      saveDir.mkdirs(); 
    } 
    File file = new File(saveDir+File.separator+fileName);   
    FileOutputStream fos = new FileOutputStream(file);    
    fos.write(getData);  
    if(fos!=null){ 
      fos.close();  
    } 
    if(inputStream!=null){ 
      inputStream.close(); 
    } 
 
    System.out.println("info:"+url+" download success");  
 
  } 
 
   
  public static byte[] readInputStream(InputStream inputStream) throws IOException {  
    byte[] buffer = new byte[1024];  
    int len = 0;  
    ByteArrayOutputStream bos = new ByteArrayOutputStream();  
    while((len = inputStream.read(buffer)) != -1) {  
      bos.write(buffer, 0, len);  
    }  
    bos.close();  
    return bos.toByteArray();  
  }  
 
  public static void main(String[] args) { 
    try{ 
      for (int i = 201; i <=520; i++) {
 downLoadFromUrl("https://ss1.bdstatic.com/kvoZeXSm1A5BphGlnYG/skin/" + i + ".jpg",i + ".jpg","E:/Downloads/wallpaper/baiduSkin"); 
      }
    }catch (Exception e) { 
      // TODO: handle exception 
    } 
  } 
}

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