Java 通过设置Referer反盗链

下面是完整的代码。

package cn.searchphoto.util;
import java.io.file;
import java.io.fileoutputstream;
import java.io.inputstream;
import java.io.outputstream;
import java.net.url;
import java.net.urlconnection;
import java.util.zip.gzipinputstream;
/**
* 下载远程网站的图片，通过设置referer反反盗链。
*
* @author java世纪网(java2000.net, laozizhu.com)
*/
public class imagedownloader {
/**
* 下载文件到指定位置
* @param imgurl 下载连接
* @param f 目标文件
* @return 成功返回文件，失败返回null
*/
public static file download(string imgurl, file f) {
try {
url url = new url(imgurl);
urlconnection con = url.openconnection();
int index = imgurl.indexof("/", 10);
con.setrequestproperty("host", index == -1 ? imgurl.substring(7) : imgurl.substring(7, index));
con.setrequestproperty("referer", imgurl);
inputstream is = con.getinputstream();
if (con.getcontentencoding() != null && con.getcontentencoding().equalsignorecase("gzip")) {
is = new gzipinputstream(con.getinputstream());
}
byte[] bs = new byte[1024];
int len = -1;
outputstream os = new fileoutputstream(f);
try {
while ((len = is.read(bs)) != -1) {
os.write(bs, 0, len);
}
} finally {
try {
os.close();
} catch (exception ex) {}
try {
is.close();
} catch (exception ex) {}
}
return f;
} catch (exception ex) {
ex.printstacktrace();
return null;
}
}
}