Java URL 类 openStream 抛出 java.net.ConnectException:连接被拒绝:连接 [英] Java URL class openStream throwing java.net.ConnectException: Connection refused: connect
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问题描述
我正在尝试编写一个简单的程序来显示各种 URL 的内容.我的代码是这样的.
I'm trying to write a simple program that displays the content of various URLS. My code is this.
import java.io.IOException;
import java.io.InputStream;
import java.net.*;
public class test {
public static void main(String[] args) {
URL url;
//String site ="ftp://ftp.suse.com/";
//String site ="http://www.google.ca";
//String site = "ftp://ftp.gnu.org/README";
String site = "ftp://metalab.unc.edu/";
try {
url = new URL(site);
InputStream stream = url.openStream();
for(int i = 0;i!= -1;i= stream.read()){
System.out.print((char)i);
}
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
前3个资源没问题
- 字符串站点 ="ftp://ftp.suse.com/";
- String site = "http://www.google.ca";
- String site = "ftp://ftp.gnu.org/README";
最后一个
- String site = "ftp://metalab.unc.edu/";
产生以下错误
java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.ftp.impl.FtpClient.openPassiveDataConnection(Unknown Source)
at sun.net.ftp.impl.FtpClient.openDataConnection(Unknown Source)
at sun.net.ftp.impl.FtpClient.list(Unknown Source)
at sun.net.www.protocol.ftp.FtpURLConnection.getInputStream(Unknown Source)
at java.net.URL.openStream(Unknown Source)
at test.main(test.java:13)
这也发生在我尝试过的其他各种 ftp 站点上.HTTP 站点没有任何问题.我能做些什么来解决这个问题的任何想法.我可以从浏览器访问的所有指定资源.
This also happens with various other ftp sites that I have tried as well. Haven't had any problems with HTTP sites. Any ideas what I can do to fix this. All the specified resources I can reach from my browser.
推荐答案
该站点可能是 拒绝非浏览器用户代理.您可以尝试设置用户代理:
It's possible that the site is refusing non-browser user agents. You can try setting the User-Agent:
URL url;
String site = "ftp://metalab.unc.edu/";
try {
url = new URL(site);
URLConnection urlc = url.openConnection();
urlc.addRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0a2) Gecko/20110613 Firefox/6.0a2");
InputStream stream = urlc.getInputStream();
for(int i = 0;i!= -1;i= stream.read()){
System.out.print((char)i);
}
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
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