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以前写过通过URLConnection下载图片等网络资源的代码，不过发现象新浪等网站，都不允许直接连接，所以增强了代码，通过模拟仿造referer来实现下载。
下面是完整的代码。
package cn.searchphoto.util;<br /> import java.io.File;<br /> import java.io.FileOutputStream;<br /> import java.io.InputStream;<br /> import java.io.OutputStream;<br /> import java.net.URL;<br /> import java.net.URLConnection;<br /> import java.util.zip.GZIPInputStream;<br /> /**<br /> * 下载远程网站的图片，通过设置Referer反反盗链。<br /> *<br /> * @author JAVA世纪网(java2000.net, laozizhu.com)<br /> */<br /> public class ImageDownloader {<br /> /**<br /> * 下载文件到指定位置<br /> * @param imgurl 下载连接<br /> * @param f 目标文件<br /> * @return 成功返回文件，失败返回null<br /> */<br /> public static File download(String imgurl, File f) {<br /> try {<br /> URL url = new URL(imgurl);<br /> URLConnection con = url.openConnection();<br /> int index = imgurl.indexOf("/", 10);<br /> con.setRequestProperty("Host", index == -1 ? imgurl.substring(7) : imgurl.substring(7, index));<br /> con.setRequestProperty("Referer", imgurl);<br /> InputStream is = con.getInputStream();<br /> if (con.getContentEncoding() != null && con.getContentEncoding().equalsIgnoreCase("gzip")) {<br /> is = new GZIPInputStream(con.getInputStream());<br /> }<br /> byte[] bs = new byte[1024];<br /> int len = -1;<br /> OutputStream os = new FileOutputStream(f);<br /> try {<br /> while ((len = is.read(bs)) != -1) {<br /> os.write(bs, 0, len);<br /> }<br /> } finally {<br /> try {<br /> os.close();<br /> } catch (Exception ex) {}<br /> try {<br /> is.close();<br /> } catch (Exception ex) {}<br /> }<br /> return f;<br /> } catch (Exception ex) {<br /> ex.printStackTrace();<br /> return null;<br /> }<br /> }<br /> }<br />
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