使用httpclient下载远程文件

CloseableHttpClient client = HttpClients.createDefault();
RequestConfig config = null;
//使用代理

if(null != proxy && StringUtils.isNotBlank(proxy.ip) && proxy.port > 0){
HttpHost proxy = new HttpHost(proxy.ip, proxy.port);
config = RequestConfig.custom().setProxy(proxy).build();
}else{
//没有代理，使用默认值
config = RequestConfig.custom().build();
}
//目标文件url
HttpGet httpGet = new HttpGet(url);
httpGet.setConfig(config);
//下载需登陆，设置登陆后的cookie
httpGet.addHeader("Cookie", cookie);

try {
HttpResponse respone = client.execute(httpGet);
if(respone.getStatusLine().getStatusCode() != HttpStatus.SC_OK){
return ;
}
HttpEntity entity = respone.getEntity();
if(entity != null) {
InputStream is = entity.getContent();
File file = new File("目标文件生成路径");
FileOutputStream fos = new FileOutputStream(file);
byte[] buffer = new byte[4096];
int len = -1;
while((len = is.read(buffer) )!= -1){
fos.write(buffer, 0, len);
}
fos.close();
is.close();
files.add(file);
}
} catch (Exception e) {

}finally{
try {
client.close();
} catch (IOException e) {
e.printStackTrace();
}
}