eclipse url的InputStream输入 编译出现错误

[Lafite_1039814352]

public static void main (String[] args)throws Exception {
URL url=new URL("http","www.mldnjava.cn",80,"index.html");
InputStream input=url.openStream();
Scanner scan=new Scanner(input);
scan.useDelimiter("\n");
while(scan.hasNext()) {
System.out.println(scan.next());
}
}

编译出现的错误：
Exception in thread "main" java.net.UnknownHostException: www.mldnjava.cn
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:221)
at java.base/java.net.PlainSocketImpl.connect(PlainSocketImpl.java:148)
at java.base/java.net.Socket.connect(Socket.java:591)
at java.base/java.net.Socket.connect(Socket.java:540)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569)
at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:341)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:362)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1242)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1181)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1075)
at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1009)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1581)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1509)
at java.base/java.net.URL.openStream(URL.java:1117)
at try_internet.Try_test.main(Try_test.java:11)

[企鹅爱吃方便面]

URL url = null;  
        InputStream is =null;  
        try {  
            url = new URL(path);//path是方法的参数，String path  
        } catch (MalformedURLException e) {  
            e.printStackTrace();  
        }  
        try {  
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();//利用HttpURLConnection对象,我们可以从网络中获取网页数据.  
            conn.setDoInput(true);  
            conn.connect();  
            is = conn.getInputStream(); //得到网络返回的输入流  
              
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return is;  

[Lafite_1039814352]

引用 1 楼 ai977313677 的回复:

URL url = null;  
        InputStream is =null;  
        try {  
            url = new URL(path);//path是方法的参数，String path  
        } catch (MalformedURLException e) {  
            e.printStackTrace();  
        }  
        try {  
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();//利用HttpURLConnection对象,我们可以从网络中获取网页数据.  
            conn.setDoInput(true);  
            conn.connect();  
            is = conn.getInputStream(); //得到网络返回的输入流  
              
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return is;  

[企鹅爱吃方便面]

你这样试过之后如果还是不行，那么可能就是说你的dns解析不了这个域名，你可以换一个可以解析的URL，如百度www.baidu.com试试，换了URL之后成功，可以完全确定，就是你的dns无法解析，去配置一下hosts文件就好了